Merge brad/2549-downrez-controls into release/2024.09-ExtraFPS (#2864)

24 files changed, 1952 insertions, 988 deletions

diff --git a/indra/llrender/CMakeLists.txt b/indra/llrender/CMakeLists.txt
index 7f881c8bb3..ccff7c7a8c 100644
--- a/indra/llrender/CMakeLists.txt
+++ b/indra/llrender/CMakeLists.txt
@@ -17,6 +17,7 @@ set(llrender_SOURCE_FILES
     llfontfreetype.cpp
     llfontfreetypesvg.cpp
     llfontgl.cpp
+    llfontvertexbuffer.cpp
     llfontregistry.cpp
     llgl.cpp
     llglslshader.cpp
@@ -43,6 +44,7 @@ set(llrender_HEADER_FILES
     llcubemap.h
     llcubemaparray.h
     llfontgl.h
+    llfontvertexbuffer.h
     llfontfreetype.h
     llfontfreetypesvg.h
     llfontbitmapcache.h
diff --git a/indra/llrender/llcubemaparray.cpp b/indra/llrender/llcubemaparray.cpp
index be69b997da..4f5e13765a 100644
--- a/indra/llrender/llcubemaparray.cpp
+++ b/indra/llrender/llcubemaparray.cpp
@@ -125,27 +125,25 @@ void LLCubeMapArray::allocate(U32 resolution, U32 components, U32 count, bool us
     mImage->setHasMipMaps(use_mips);
 
     bind(0);
+    free_cur_tex_image();
 
     U32 format = components == 4 ? GL_RGBA16F : GL_RGB16F;
-
     U32 mip = 0;
-
-    free_cur_tex_image();
-
-    while (resolution >= 1)
+    U32 mip_resolution = resolution;
+    while (mip_resolution >= 1)
     {
-        glTexImage3D(GL_TEXTURE_CUBE_MAP_ARRAY, mip, format, resolution, resolution, count * 6, 0,
+        glTexImage3D(GL_TEXTURE_CUBE_MAP_ARRAY, mip, format, mip_resolution, mip_resolution, count * 6, 0,
             GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
 
         if (!use_mips)
         {
             break;
         }
-        resolution /= 2;
+        mip_resolution /= 2;
         ++mip;
     }
 
-    alloc_tex_image(resolution * 6, resolution, format);
+    alloc_tex_image(resolution, resolution, format, count * 6);
 
     mImage->setAddressMode(LLTexUnit::TAM_CLAMP);
 
diff --git a/indra/llrender/llfontbitmapcache.cpp b/indra/llrender/llfontbitmapcache.cpp
index 46c2e89797..ee9cfd0719 100644
--- a/indra/llrender/llfontbitmapcache.cpp
+++ b/indra/llrender/llfontbitmapcache.cpp
@@ -117,7 +117,7 @@ bool LLFontBitmapCache::nextOpenPos(S32 width, S32& pos_x, S32& pos_y, EFontGlyp
             }
 
             // Make corresponding GL image.
-            mImageGLVec[bitmap_idx].push_back(new LLImageGL(image_raw, false));
+            mImageGLVec[bitmap_idx].push_back(new LLImageGL(image_raw, false, false));
             LLImageGL* image_gl = getImageGL(bitmap_type, bitmap_num);
 
             // Start at beginning of the new image.
diff --git a/indra/llrender/llfontgl.cpp b/indra/llrender/llfontgl.cpp
index b6cdb81b33..4c9a062246 100644
--- a/indra/llrender/llfontgl.cpp
+++ b/indra/llrender/llfontgl.cpp
@@ -270,10 +270,10 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 
     const LLFontGlyphInfo* next_glyph = NULL;
 
-    const S32 GLYPH_BATCH_SIZE = 30;
-    LLVector3 vertices[GLYPH_BATCH_SIZE * 4];
-    LLVector2 uvs[GLYPH_BATCH_SIZE * 4];
-    LLColor4U colors[GLYPH_BATCH_SIZE * 4];
+    static constexpr S32 GLYPH_BATCH_SIZE = 30;
+    static thread_local LLVector4a vertices[GLYPH_BATCH_SIZE * 6];
+    static thread_local LLVector2 uvs[GLYPH_BATCH_SIZE * 6];
+    static thread_local LLColor4U colors[GLYPH_BATCH_SIZE * 6];
 
     LLColor4U text_color(color);
     // Preserve the transparency to render fading emojis in fading text (e.g.
@@ -305,9 +305,9 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
             // otherwise the queued glyphs will be taken from wrong textures.
             if (glyph_count > 0)
             {
-                gGL.begin(LLRender::QUADS);
+                gGL.begin(LLRender::TRIANGLES);
                 {
-                    gGL.vertexBatchPreTransformed(vertices, uvs, colors, glyph_count * 4);
+                    gGL.vertexBatchPreTransformed(vertices, uvs, colors, glyph_count * 6);
                 }
                 gGL.end();
                 glyph_count = 0;
@@ -338,9 +338,9 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 
         if (glyph_count >= GLYPH_BATCH_SIZE)
         {
-            gGL.begin(LLRender::QUADS);
+            gGL.begin(LLRender::TRIANGLES);
             {
-                gGL.vertexBatchPreTransformed(vertices, uvs, colors, glyph_count * 4);
+                gGL.vertexBatchPreTransformed(vertices, uvs, colors, glyph_count * 6);
             }
             gGL.end();
 
@@ -376,9 +376,9 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
         cur_render_y = cur_y;
     }
 
-    gGL.begin(LLRender::QUADS);
+    gGL.begin(LLRender::TRIANGLES);
     {
-        gGL.vertexBatchPreTransformed(vertices, uvs, colors, glyph_count * 4);
+        gGL.vertexBatchPreTransformed(vertices, uvs, colors, glyph_count * 6);
     }
     gGL.end();
 
@@ -402,10 +402,8 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 
     if (draw_ellipses)
     {
-
         // recursively render ellipses at end of string
         // we've already reserved enough room
-        gGL.pushUIMatrix();
         static LLWString elipses_wstr(utf8string_to_wstring(std::string("...")));
         render(elipses_wstr,
                 0,
@@ -418,7 +416,6 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
                 right_x,
                 false,
                 use_color);
-        gGL.popUIMatrix();
     }
 
     gGL.popUIMatrix();
@@ -504,6 +501,7 @@ F32 LLFontGL::getWidthF32(const std::string& utf8text, S32 begin_offset, S32 max
 
 F32 LLFontGL::getWidthF32(const llwchar* wchars, S32 begin_offset, S32 max_chars, bool no_padding) const
 {
+    LL_PROFILE_ZONE_SCOPED_CATEGORY_UI;
     const S32 LAST_CHARACTER = LLFontFreetype::LAST_CHAR_FULL;
 
     F32 cur_x = 0;
@@ -1227,31 +1225,42 @@ LLFontGL &LLFontGL::operator=(const LLFontGL &source)
     return *this;
 }
 
-void LLFontGL::renderQuad(LLVector3* vertex_out, LLVector2* uv_out, LLColor4U* colors_out, const LLRectf& screen_rect, const LLRectf& uv_rect, const LLColor4U& color, F32 slant_amt) const
+void LLFontGL::renderTriangle(LLVector4a* vertex_out, LLVector2* uv_out, LLColor4U* colors_out, const LLRectf& screen_rect, const LLRectf& uv_rect, const LLColor4U& color, F32 slant_amt) const
 {
     S32 index = 0;
 
-    vertex_out[index] = LLVector3(screen_rect.mRight, screen_rect.mTop, 0.f);
-    uv_out[index] = LLVector2(uv_rect.mRight, uv_rect.mTop);
+    vertex_out[index].set(screen_rect.mRight, screen_rect.mTop, 0.f);
+    uv_out[index].set(uv_rect.mRight, uv_rect.mTop);
+    colors_out[index] = color;
+    index++;
+
+    vertex_out[index].set(screen_rect.mLeft, screen_rect.mTop, 0.f);
+    uv_out[index].set(uv_rect.mLeft, uv_rect.mTop);
     colors_out[index] = color;
     index++;
 
-    vertex_out[index] = LLVector3(screen_rect.mLeft, screen_rect.mTop, 0.f);
-    uv_out[index] = LLVector2(uv_rect.mLeft, uv_rect.mTop);
+    vertex_out[index].set(screen_rect.mLeft, screen_rect.mBottom, 0.f);
+    uv_out[index].set(uv_rect.mLeft, uv_rect.mBottom);
+    colors_out[index] = color;
+    index++;
+
+
+    vertex_out[index].set(screen_rect.mRight, screen_rect.mTop, 0.f);
+    uv_out[index].set(uv_rect.mRight, uv_rect.mTop);
     colors_out[index] = color;
     index++;
 
-    vertex_out[index] = LLVector3(screen_rect.mLeft, screen_rect.mBottom, 0.f);
-    uv_out[index] = LLVector2(uv_rect.mLeft, uv_rect.mBottom);
+    vertex_out[index].set(screen_rect.mLeft, screen_rect.mBottom, 0.f);
+    uv_out[index].set(uv_rect.mLeft, uv_rect.mBottom);
     colors_out[index] = color;
     index++;
 
-    vertex_out[index] = LLVector3(screen_rect.mRight, screen_rect.mBottom, 0.f);
-    uv_out[index] = LLVector2(uv_rect.mRight, uv_rect.mBottom);
+    vertex_out[index].set(screen_rect.mRight, screen_rect.mBottom, 0.f);
+    uv_out[index].set(uv_rect.mRight, uv_rect.mBottom);
     colors_out[index] = color;
 }
 
-void LLFontGL::drawGlyph(S32& glyph_count, LLVector3* vertex_out, LLVector2* uv_out, LLColor4U* colors_out, const LLRectf& screen_rect, const LLRectf& uv_rect, const LLColor4U& color, U8 style, ShadowType shadow, F32 drop_shadow_strength) const
+void LLFontGL::drawGlyph(S32& glyph_count, LLVector4a* vertex_out, LLVector2* uv_out, LLColor4U* colors_out, const LLRectf& screen_rect, const LLRectf& uv_rect, const LLColor4U& color, U8 style, ShadowType shadow, F32 drop_shadow_strength) const
 {
     F32 slant_offset;
     slant_offset = ((style & ITALIC) ? ( -mFontFreetype->getAscenderHeight() * 0.2f) : 0.f);
@@ -1265,7 +1274,7 @@ void LLFontGL::drawGlyph(S32& glyph_count, LLVector3* vertex_out, LLVector2* uv_
             LLRectf screen_rect_offset = screen_rect;
 
             screen_rect_offset.translate((F32)(pass * BOLD_OFFSET), 0.f);
-            renderQuad(&vertex_out[glyph_count * 4], &uv_out[glyph_count * 4], &colors_out[glyph_count * 4], screen_rect_offset, uv_rect, color, slant_offset);
+            renderTriangle(&vertex_out[glyph_count * 6], &uv_out[glyph_count * 6], &colors_out[glyph_count * 6], screen_rect_offset, uv_rect, color, slant_offset);
             glyph_count++;
         }
     }
@@ -1296,10 +1305,10 @@ void LLFontGL::drawGlyph(S32& glyph_count, LLVector3* vertex_out, LLVector2* uv_
                 break;
             }
 
-            renderQuad(&vertex_out[glyph_count * 4], &uv_out[glyph_count * 4], &colors_out[glyph_count * 4], screen_rect_offset, uv_rect, shadow_color, slant_offset);
+            renderTriangle(&vertex_out[glyph_count * 6], &uv_out[glyph_count * 6], &colors_out[glyph_count * 6], screen_rect_offset, uv_rect, shadow_color, slant_offset);
             glyph_count++;
         }
-        renderQuad(&vertex_out[glyph_count * 4], &uv_out[glyph_count * 4], &colors_out[glyph_count * 4], screen_rect, uv_rect, color, slant_offset);
+        renderTriangle(&vertex_out[glyph_count * 6], &uv_out[glyph_count * 6], &colors_out[glyph_count * 6], screen_rect, uv_rect, color, slant_offset);
         glyph_count++;
     }
     else if (shadow == DROP_SHADOW)
@@ -1308,14 +1317,14 @@ void LLFontGL::drawGlyph(S32& glyph_count, LLVector3* vertex_out, LLVector2* uv_
         shadow_color.mV[VALPHA] = U8(color.mV[VALPHA] * drop_shadow_strength);
         LLRectf screen_rect_shadow = screen_rect;
         screen_rect_shadow.translate(1.f, -1.f);
-        renderQuad(&vertex_out[glyph_count * 4], &uv_out[glyph_count * 4], &colors_out[glyph_count * 4], screen_rect_shadow, uv_rect, shadow_color, slant_offset);
+        renderTriangle(&vertex_out[glyph_count * 6], &uv_out[glyph_count * 6], &colors_out[glyph_count * 6], screen_rect_shadow, uv_rect, shadow_color, slant_offset);
         glyph_count++;
-        renderQuad(&vertex_out[glyph_count * 4], &uv_out[glyph_count * 4], &colors_out[glyph_count * 4], screen_rect, uv_rect, color, slant_offset);
+        renderTriangle(&vertex_out[glyph_count * 6], &uv_out[glyph_count * 6], &colors_out[glyph_count * 6], screen_rect, uv_rect, color, slant_offset);
         glyph_count++;
     }
     else // normal rendering
     {
-        renderQuad(&vertex_out[glyph_count * 4], &uv_out[glyph_count * 4], &colors_out[glyph_count * 4], screen_rect, uv_rect, color, slant_offset);
+        renderTriangle(&vertex_out[glyph_count * 6], &uv_out[glyph_count * 6], &colors_out[glyph_count * 6], screen_rect, uv_rect, color, slant_offset);
         glyph_count++;
     }
 }
diff --git a/indra/llrender/llfontgl.h b/indra/llrender/llfontgl.h
index de7529a583..4bb6c55c65 100644
--- a/indra/llrender/llfontgl.h
+++ b/indra/llrender/llfontgl.h
@@ -238,8 +238,8 @@ private:
     LLFontDescriptor mFontDescriptor;
     LLPointer<LLFontFreetype> mFontFreetype;
 
-    void renderQuad(LLVector3* vertex_out, LLVector2* uv_out, LLColor4U* colors_out, const LLRectf& screen_rect, const LLRectf& uv_rect, const LLColor4U& color, F32 slant_amt) const;
-    void drawGlyph(S32& glyph_count, LLVector3* vertex_out, LLVector2* uv_out, LLColor4U* colors_out, const LLRectf& screen_rect, const LLRectf& uv_rect, const LLColor4U& color, U8 style, ShadowType shadow, F32 drop_shadow_fade) const;
+    void renderTriangle(LLVector4a* vertex_out, LLVector2* uv_out, LLColor4U* colors_out, const LLRectf& screen_rect, const LLRectf& uv_rect, const LLColor4U& color, F32 slant_amt) const;
+    void drawGlyph(S32& glyph_count, LLVector4a* vertex_out, LLVector2* uv_out, LLColor4U* colors_out, const LLRectf& screen_rect, const LLRectf& uv_rect, const LLColor4U& color, U8 style, ShadowType shadow, F32 drop_shadow_fade) const;
 
     // Registry holds all instantiated fonts.
     static LLFontRegistry* sFontRegistry;
diff --git a/indra/llrender/llfontvertexbuffer.cpp b/indra/llrender/llfontvertexbuffer.cpp
new file mode 100644
index 0000000000..5bd1ca5eed
--- /dev/null
+++ b/indra/llrender/llfontvertexbuffer.cpp
@@ -0,0 +1,233 @@
+/**
+ * @file llfontvertexbuffer.cpp
+ * @brief Buffer storage for font rendering.
+ *
+ * $LicenseInfo:firstyear=2024&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2024, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "linden_common.h"
+
+#include "llfontvertexbuffer.h"
+
+#include "llvertexbuffer.h"
+
+
+bool LLFontVertexBuffer::sEnableBufferCollection = true;
+
+LLFontVertexBuffer::LLFontVertexBuffer()
+{
+}
+
+LLFontVertexBuffer::~LLFontVertexBuffer()
+{
+    reset();
+}
+
+void LLFontVertexBuffer::reset()
+{
+    // Todo: some form of debug only frequecy check&assert to see if this is happening too often.
+    // Regenerating this list is expensive
+    mBufferList.clear();
+}
+
+S32 LLFontVertexBuffer::render(
+    const LLFontGL* fontp,
+    const LLWString& text,
+    S32 begin_offset,
+    LLRect rect,
+    const LLColor4& color,
+    LLFontGL::HAlign halign, LLFontGL::VAlign valign,
+    U8 style,
+    LLFontGL::ShadowType shadow,
+    S32 max_chars, S32 max_pixels,
+    F32* right_x,
+    bool use_ellipses,
+    bool use_color)
+{
+    LLRectf rect_float((F32)rect.mLeft, (F32)rect.mTop, (F32)rect.mRight, (F32)rect.mBottom);
+    return render(fontp, text, begin_offset, rect_float, color, halign, valign, style, shadow, max_chars, right_x, use_ellipses, use_color);
+}
+
+S32 LLFontVertexBuffer::render(
+    const LLFontGL* fontp,
+    const LLWString& text,
+    S32 begin_offset,
+    LLRectf rect,
+    const LLColor4& color,
+    LLFontGL::HAlign halign, LLFontGL::VAlign valign,
+    U8 style,
+    LLFontGL::ShadowType shadow,
+    S32 max_chars,
+    F32* right_x,
+    bool use_ellipses,
+    bool use_color)
+{
+    F32 x = rect.mLeft;
+    F32 y = 0.f;
+
+    switch (valign)
+    {
+    case LLFontGL::TOP:
+        y = rect.mTop;
+        break;
+    case LLFontGL::VCENTER:
+        y = rect.getCenterY();
+        break;
+    case LLFontGL::BASELINE:
+    case LLFontGL::BOTTOM:
+        y = rect.mBottom;
+        break;
+    default:
+        y = rect.mBottom;
+        break;
+    }
+    return render(fontp, text, begin_offset, x, y, color, halign, valign, style, shadow, max_chars, (S32)rect.getWidth(), right_x, use_ellipses, use_color);
+}
+
+S32 LLFontVertexBuffer::render(
+    const LLFontGL* fontp,
+    const LLWString& text,
+    S32 begin_offset,
+    F32 x, F32 y,
+    const LLColor4& color,
+    LLFontGL::HAlign halign, LLFontGL::VAlign valign,
+    U8 style,
+    LLFontGL::ShadowType shadow,
+    S32 max_chars , S32 max_pixels,
+    F32* right_x,
+    bool use_ellipses,
+    bool use_color )
+{
+    if (!LLFontGL::sDisplayFont) //do not display texts
+    {
+        return static_cast<S32>(text.length());
+    }
+    if (!sEnableBufferCollection)
+    {
+        // For debug purposes and performance testing
+        return fontp->render(text, begin_offset, x, y, color, halign, valign, style, shadow, max_chars, max_pixels, right_x, use_ellipses, use_color);
+    }
+    if (mBufferList.empty())
+    {
+        genBuffers(fontp, text, begin_offset, x, y, color, halign, valign,
+            style, shadow, max_chars, max_pixels, right_x, use_ellipses, use_color);
+    }
+    else if (mLastX != x
+             || mLastY != y
+             || mLastFont != fontp
+             || mLastColor != color // alphas change often
+             || mLastHalign != halign
+             || mLastValign != valign
+             || mLastOffset != begin_offset
+             || mLastMaxChars != max_chars
+             || mLastMaxPixels != max_pixels
+             || mLastStyle != style
+             || mLastShadow != shadow // ex: buttons change shadow state
+             || mLastScaleX != LLFontGL::sScaleX
+             || mLastScaleY != LLFontGL::sScaleY
+             || mLastVertDPI != LLFontGL::sVertDPI
+             || mLastHorizDPI != LLFontGL::sHorizDPI
+             || mLastOrigin != LLFontGL::sCurOrigin)
+    {
+        genBuffers(fontp, text, begin_offset, x, y, color, halign, valign,
+            style, shadow, max_chars, max_pixels, right_x, use_ellipses, use_color);
+    }
+    else
+    {
+        renderBuffers();
+
+        if (right_x)
+        {
+            *right_x = mLastRightX;
+        }
+    }
+    return mChars;
+}
+
+void LLFontVertexBuffer::genBuffers(
+    const LLFontGL* fontp,
+    const LLWString& text,
+    S32 begin_offset,
+    F32 x, F32 y,
+    const LLColor4& color,
+    LLFontGL::HAlign halign, LLFontGL::VAlign valign,
+    U8 style, LLFontGL::ShadowType shadow,
+    S32 max_chars, S32 max_pixels,
+    F32* right_x,
+    bool use_ellipses,
+    bool use_color)
+{
+    // todo: add a debug build assert if this triggers too often for to long?
+    mBufferList.clear();
+
+    gGL.beginList(&mBufferList);
+    mChars = fontp->render(text, begin_offset, x, y, color, halign, valign,
+        style, shadow, max_chars, max_pixels, right_x, use_ellipses, use_color);
+    gGL.endList();
+
+    mLastFont = fontp;
+    mLastOffset = begin_offset;
+    mLastMaxChars = max_chars;
+    mLastMaxPixels = max_pixels;
+    mLastX = x;
+    mLastY = y;
+    mLastColor = color;
+    mLastHalign = halign;
+    mLastValign = valign;
+    mLastStyle = style;
+    mLastShadow = shadow;
+
+    mLastScaleX = LLFontGL::sScaleX;
+    mLastScaleY = LLFontGL::sScaleY;
+    mLastVertDPI = LLFontGL::sVertDPI;
+    mLastHorizDPI = LLFontGL::sHorizDPI;
+    mLastOrigin = LLFontGL::sCurOrigin;
+
+    if (right_x)
+    {
+        mLastRightX = *right_x;
+    }
+}
+
+void LLFontVertexBuffer::renderBuffers()
+{
+    gGL.flush(); // deliberately empty pending verts
+    gGL.getTexUnit(0)->enable(LLTexUnit::TT_TEXTURE);
+    gGL.pushUIMatrix();
+
+    gGL.loadUIIdentity();
+
+    // Depth translation, so that floating text appears 'in-world'
+    // and is correctly occluded.
+    gGL.translatef(0.f, 0.f, LLFontGL::sCurDepth);
+    gGL.setSceneBlendType(LLRender::BT_ALPHA);
+
+    // Note: ellipses should technically be covered by push/load/translate of their own
+    // but it's more complexity, values do not change, skipping doesn't appear to break
+    // anything, so we can skip that until it proves to cause issues.
+    for (LLVertexBufferData& buffer : mBufferList)
+    {
+        buffer.draw();
+    }
+    gGL.popUIMatrix();
+}
+
diff --git a/indra/llrender/llfontvertexbuffer.h b/indra/llrender/llfontvertexbuffer.h
new file mode 100644
index 0000000000..af195dfff9
--- /dev/null
+++ b/indra/llrender/llfontvertexbuffer.h
@@ -0,0 +1,125 @@
+/**
+ * @file llfontgl.h
+ * @author Andrii Kleshchev
+ * @brief Buffer storage for font rendering.
+ *
+ * $LicenseInfo:firstyear=2001&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLFONTVERTEXBUFFER_H
+#define LL_LLFONTVERTEXBUFFER_H
+
+#include "llfontgl.h"
+
+class LLVertexBufferData;
+
+class LLFontVertexBuffer
+{
+public:
+    LLFontVertexBuffer();
+    ~LLFontVertexBuffer();
+
+    void reset();
+
+    S32 render(const LLFontGL* fontp,
+        const LLWString& text,
+        S32 begin_offset,
+        LLRect rect,
+        const LLColor4& color,
+        LLFontGL::HAlign halign = LLFontGL::LEFT, LLFontGL::VAlign valign = LLFontGL::BASELINE,
+        U8 style = LLFontGL::NORMAL,
+        LLFontGL::ShadowType shadow = LLFontGL::NO_SHADOW,
+        S32 max_chars = S32_MAX, S32 max_pixels = S32_MAX,
+        F32* right_x = NULL,
+        bool use_ellipses = false,
+        bool use_color = true);
+
+    S32 render(const LLFontGL* fontp,
+        const LLWString& text,
+        S32 begin_offset,
+        LLRectf rect,
+        const LLColor4& color,
+        LLFontGL::HAlign halign = LLFontGL::LEFT, LLFontGL::VAlign valign = LLFontGL::BASELINE,
+        U8 style = LLFontGL::NORMAL,
+        LLFontGL::ShadowType shadow = LLFontGL::NO_SHADOW,
+        S32 max_chars = S32_MAX,
+        F32* right_x = NULL,
+        bool use_ellipses = false,
+        bool use_color = true);
+
+    S32 render(const LLFontGL* fontp,
+        const LLWString& text,
+        S32 begin_offset,
+        F32 x, F32 y,
+        const LLColor4& color,
+        LLFontGL::HAlign halign = LLFontGL::LEFT, LLFontGL::VAlign valign = LLFontGL::BASELINE,
+        U8 style = LLFontGL::NORMAL,
+        LLFontGL::ShadowType shadow = LLFontGL::NO_SHADOW,
+        S32 max_chars = S32_MAX, S32 max_pixels = S32_MAX,
+        F32* right_x = NULL,
+        bool use_ellipses = false,
+        bool use_color = true);
+
+    static void enableBufferCollection(bool enable) { sEnableBufferCollection = enable; }
+private:
+
+    void genBuffers(const LLFontGL* fontp,
+         const LLWString& text,
+         S32 begin_offset,
+         F32 x, F32 y,
+         const LLColor4& color,
+         LLFontGL::HAlign halign, LLFontGL::VAlign valign,
+         U8 style,
+        LLFontGL::ShadowType shadow,
+         S32 max_chars, S32 max_pixels,
+         F32* right_x,
+         bool use_ellipses,
+         bool use_color);
+
+    void renderBuffers();
+
+    std::list<LLVertexBufferData> mBufferList;
+    S32 mChars = 0;
+    const LLFontGL *mLastFont = nullptr;
+    S32 mLastOffset = 0;
+    S32 mLastMaxChars = 0;
+    S32 mLastMaxPixels = 0;
+    F32 mLastX = 0.f;
+    F32 mLastY = 0.f;
+    LLColor4 mLastColor;
+    LLFontGL::HAlign mLastHalign = LLFontGL::LEFT;
+    LLFontGL::VAlign mLastValign = LLFontGL::BASELINE;
+    U8 mLastStyle = LLFontGL::NORMAL;
+    LLFontGL::ShadowType mLastShadow = LLFontGL::NO_SHADOW;
+    F32 mLastRightX = 0.f;
+
+    // LLFontGL's statics
+    F32 mLastScaleX = 1.f;
+    F32 mLastScaleY = 1.f;
+    F32 mLastVertDPI = 0.f;
+    F32 mLastHorizDPI = 0.f;
+    LLCoordGL mLastOrigin;
+
+    static bool sEnableBufferCollection;
+};
+
+#endif
diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index 0afe78a30c..c5c9d50dee 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -50,6 +50,10 @@
 #include "llglheaders.h"
 #include "llglslshader.h"
 
+#include "glm/glm.hpp"
+#include <glm/gtc/matrix_access.hpp>
+#include "glm/gtc/type_ptr.hpp"
+
 #if LL_WINDOWS
 #include "lldxhardware.h"
 #endif
@@ -1166,6 +1170,11 @@ bool LLGLManager::initGL()
         mGLVendorShort = "INTEL";
         mIsIntel = true;
     }
+    else if (mGLVendor.find("APPLE") != std::string::npos)
+    {
+        mGLVendorShort = "APPLE";
+        mIsApple = true;
+    }
     else
     {
         mGLVendorShort = "MISC";
@@ -2694,7 +2703,7 @@ void parse_glsl_version(S32& major, S32& minor)
     LLStringUtil::convertToS32(minor_str, minor);
 }
 
-LLGLUserClipPlane::LLGLUserClipPlane(const LLPlane& p, const glh::matrix4f& modelview, const glh::matrix4f& projection, bool apply)
+LLGLUserClipPlane::LLGLUserClipPlane(const LLPlane& p, const glm::mat4& modelview, const glm::mat4& projection, bool apply)
 {
     mApply = apply;
 
@@ -2721,13 +2730,12 @@ void LLGLUserClipPlane::disable()
 
 void LLGLUserClipPlane::setPlane(F32 a, F32 b, F32 c, F32 d)
 {
-    glh::matrix4f& P = mProjection;
-    glh::matrix4f& M = mModelview;
+    const glm::mat4& P = mProjection;
+    const glm::mat4& M = mModelview;
 
-    glh::matrix4f invtrans_MVP = (P * M).inverse().transpose();
-    glh::vec4f oplane(a,b,c,d);
-    glh::vec4f cplane;
-    invtrans_MVP.mult_matrix_vec(oplane, cplane);
+    glm::mat4 invtrans_MVP = glm::transpose(glm::inverse(P*M));
+    glm::vec4 oplane(a,b,c,d);
+    glm::vec4 cplane = invtrans_MVP * oplane;
 
     cplane /= fabs(cplane[2]); // normalize such that depth is not scaled
     cplane[3] -= 1;
@@ -2735,13 +2743,13 @@ void LLGLUserClipPlane::setPlane(F32 a, F32 b, F32 c, F32 d)
     if(cplane[2] < 0)
         cplane *= -1;
 
-    glh::matrix4f suffix;
-    suffix.set_row(2, cplane);
-    glh::matrix4f newP = suffix * P;
+    glm::mat4 suffix;
+    suffix = glm::row(suffix, 2, cplane);
+    glm::mat4 newP = suffix * P;
     gGL.matrixMode(LLRender::MM_PROJECTION);
     gGL.pushMatrix();
-    gGL.loadMatrix(newP.m);
-    gGLObliqueProjectionInverse = LLMatrix4(newP.inverse().transpose().m);
+    gGL.loadMatrix(glm::value_ptr(newP));
+    gGLObliqueProjectionInverse = LLMatrix4(glm::value_ptr(glm::transpose(glm::inverse(newP))));
     gGL.matrixMode(LLRender::MM_MODELVIEW);
 }
 
@@ -2754,7 +2762,7 @@ LLGLDepthTest::LLGLDepthTest(GLboolean depth_enabled, GLboolean write_enabled, G
 : mPrevDepthEnabled(sDepthEnabled), mPrevDepthFunc(sDepthFunc), mPrevWriteEnabled(sWriteEnabled)
 {
     stop_glerror();
-
+    LL_PROFILE_ZONE_SCOPED_CATEGORY_PIPELINE;
     checkState();
 
     if (!depth_enabled)
@@ -2787,6 +2795,7 @@ LLGLDepthTest::LLGLDepthTest(GLboolean depth_enabled, GLboolean write_enabled, G
 
 LLGLDepthTest::~LLGLDepthTest()
 {
+    LL_PROFILE_ZONE_SCOPED_CATEGORY_PIPELINE;
     checkState();
     if (sDepthEnabled != mPrevDepthEnabled )
     {
@@ -2837,31 +2846,27 @@ void LLGLDepthTest::checkState()
 
 LLGLSquashToFarClip::LLGLSquashToFarClip()
 {
-    glh::matrix4f proj = get_current_projection();
+    glm::mat4 proj = get_current_projection();
     setProjectionMatrix(proj, 0);
 }
 
-LLGLSquashToFarClip::LLGLSquashToFarClip(glh::matrix4f& P, U32 layer)
+LLGLSquashToFarClip::LLGLSquashToFarClip(const glm::mat4& P, U32 layer)
 {
     setProjectionMatrix(P, layer);
 }
 
-
-void LLGLSquashToFarClip::setProjectionMatrix(glh::matrix4f& projection, U32 layer)
+void LLGLSquashToFarClip::setProjectionMatrix(glm::mat4 projection, U32 layer)
 {
-
     F32 depth = 0.99999f - 0.0001f * layer;
 
-    for (U32 i = 0; i < 4; i++)
-    {
-        projection.element(2, i) = projection.element(3, i) * depth;
-    }
+    glm::vec4 P_row_3 = glm::row(projection, 3) * depth;
+    projection = glm::row(projection, 2, P_row_3);
 
     LLRender::eMatrixMode last_matrix_mode = gGL.getMatrixMode();
 
     gGL.matrixMode(LLRender::MM_PROJECTION);
     gGL.pushMatrix();
-    gGL.loadMatrix(projection.m);
+    gGL.loadMatrix(glm::value_ptr(projection));
 
     gGL.matrixMode(last_matrix_mode);
 }
diff --git a/indra/llrender/llgl.h b/indra/llrender/llgl.h
index cd1ba55b16..f5b1e8d786 100644
--- a/indra/llrender/llgl.h
+++ b/indra/llrender/llgl.h
@@ -43,7 +43,7 @@
 #include "llinstancetracker.h"
 
 #include "llglheaders.h"
-#include "glh/glh_linear.h"
+#include "glm/mat4x4.hpp"
 
 extern bool gDebugGL;
 extern bool gDebugSession;
@@ -102,6 +102,7 @@ public:
     bool mIsAMD;
     bool mIsNVIDIA;
     bool mIsIntel;
+    bool mIsApple = false;
 
     // hints to the render pipe
     U32 mDownScaleMethod = 0; // see settings.xml RenderDownScaleMethod
@@ -317,7 +318,7 @@ class LLGLUserClipPlane
 {
 public:
 
-    LLGLUserClipPlane(const LLPlane& plane, const glh::matrix4f& modelview, const glh::matrix4f& projection, bool apply = true);
+    LLGLUserClipPlane(const LLPlane& plane, const glm::mat4& modelview, const glm::mat4& projection, bool apply = true);
     ~LLGLUserClipPlane();
 
     void setPlane(F32 a, F32 b, F32 c, F32 d);
@@ -326,8 +327,8 @@ public:
 private:
     bool mApply;
 
-    glh::matrix4f mProjection;
-    glh::matrix4f mModelview;
+    glm::mat4 mProjection;
+    glm::mat4 mModelview;
 };
 
 /*
@@ -341,9 +342,9 @@ class LLGLSquashToFarClip
 {
 public:
     LLGLSquashToFarClip();
-    LLGLSquashToFarClip(glh::matrix4f& projection, U32 layer = 0);
+    LLGLSquashToFarClip(const glm::mat4& projection, U32 layer = 0);
 
-    void setProjectionMatrix(glh::matrix4f& projection, U32 layer);
+    void setProjectionMatrix(glm::mat4 projection, U32 layer);
 
     ~LLGLSquashToFarClip();
 };
diff --git a/indra/llrender/llglheaders.h b/indra/llrender/llglheaders.h
index c5e1ff3e23..3d4dc5e698 100644
--- a/indra/llrender/llglheaders.h
+++ b/indra/llrender/llglheaders.h
@@ -46,7 +46,7 @@
 // LL_WINDOWS
 
 // windows gl headers depend on things like APIENTRY, so include windows.
-#include "llwin32headerslean.h"
+#include "llwin32headers.h"
 
 //----------------------------------------------------------------------------
 #include <GL/gl.h>
diff --git a/indra/llrender/llglslshader.cpp b/indra/llrender/llglslshader.cpp
index e76a30a954..6ba5463acd 100644
--- a/indra/llrender/llglslshader.cpp
+++ b/indra/llrender/llglslshader.cpp
@@ -63,6 +63,7 @@ U64 LLGLSLShader::sTotalTimeElapsed = 0;
 U32 LLGLSLShader::sTotalTrianglesDrawn = 0;
 U64 LLGLSLShader::sTotalSamplesDrawn = 0;
 U32 LLGLSLShader::sTotalBinds = 0;
+boost::json::value LLGLSLShader::sDefaultStats;
 
 //UI shader -- declared here so llui_libtest will link properly
 LLGLSLShader    gUIProgram;
@@ -101,9 +102,9 @@ void LLGLSLShader::initProfile()
     sTotalSamplesDrawn = 0;
     sTotalBinds = 0;
 
-    for (std::set<LLGLSLShader*>::iterator iter = sInstances.begin(); iter != sInstances.end(); ++iter)
+    for (auto ptr : sInstances)
     {
-        (*iter)->clearStats();
+        ptr->clearStats();
     }
 }
 
@@ -117,45 +118,57 @@ struct LLGLSLShaderCompareTimeElapsed
 };
 
 //static
-void LLGLSLShader::finishProfile(bool emit_report)
+void LLGLSLShader::finishProfile(boost::json::value& statsv)
 {
     sProfileEnabled = false;
 
-    if (emit_report)
+    if (! statsv.is_null())
     {
-        std::vector<LLGLSLShader*> sorted;
-
-        for (std::set<LLGLSLShader*>::iterator iter = sInstances.begin(); iter != sInstances.end(); ++iter)
-        {
-            sorted.push_back(*iter);
-        }
-
+        std::vector<LLGLSLShader*> sorted(sInstances.begin(), sInstances.end());
         std::sort(sorted.begin(), sorted.end(), LLGLSLShaderCompareTimeElapsed());
 
+        auto& stats = statsv.as_object();
+        auto shadersit = stats.emplace("shaders", boost::json::array_kind).first;
+        auto& shaders = shadersit->value().as_array();
         bool unbound = false;
-        for (std::vector<LLGLSLShader*>::iterator iter = sorted.begin(); iter != sorted.end(); ++iter)
+        for (auto ptr : sorted)
         {
-            (*iter)->dumpStats();
-            if ((*iter)->mBinds == 0)
+            if (ptr->mBinds == 0)
             {
                 unbound = true;
             }
+            else
+            {
+                auto& shaderit = shaders.emplace_back(boost::json::object_kind);
+                ptr->dumpStats(shaderit.as_object());
+            }
         }
 
+        constexpr float mega = 1'000'000.f;
+        float totalTimeMs = sTotalTimeElapsed / mega;
         LL_INFOS() << "-----------------------------------" << LL_ENDL;
-        LL_INFOS() << "Total rendering time: " << llformat("%.4f ms", sTotalTimeElapsed / 1000000.f) << LL_ENDL;
-        LL_INFOS() << "Total samples drawn: " << llformat("%.4f million", sTotalSamplesDrawn / 1000000.f) << LL_ENDL;
-        LL_INFOS() << "Total triangles drawn: " << llformat("%.3f million", sTotalTrianglesDrawn / 1000000.f) << LL_ENDL;
+        LL_INFOS() << "Total rendering time: " << llformat("%.4f ms", totalTimeMs) << LL_ENDL;
+        LL_INFOS() << "Total samples drawn: " << llformat("%.4f million", sTotalSamplesDrawn / mega) << LL_ENDL;
+        LL_INFOS() << "Total triangles drawn: " << llformat("%.3f million", sTotalTrianglesDrawn / mega) << LL_ENDL;
         LL_INFOS() << "-----------------------------------" << LL_ENDL;
-
+        auto totalsit = stats.emplace("totals", boost::json::object_kind).first;
+        auto& totals = totalsit->value().as_object();
+        totals.emplace("time", totalTimeMs / 1000.0);
+        totals.emplace("binds", sTotalBinds);
+        totals.emplace("samples", sTotalSamplesDrawn);
+        totals.emplace("triangles", sTotalTrianglesDrawn);
+
+        auto unusedit = stats.emplace("unused", boost::json::array_kind).first;
+        auto& unused = unusedit->value().as_array();
         if (unbound)
         {
             LL_INFOS() << "The following shaders were unused: " << LL_ENDL;
-            for (std::vector<LLGLSLShader*>::iterator iter = sorted.begin(); iter != sorted.end(); ++iter)
+            for (auto ptr : sorted)
             {
-                if ((*iter)->mBinds == 0)
+                if (ptr->mBinds == 0)
                 {
-                    LL_INFOS() << (*iter)->mName << LL_ENDL;
+                    LL_INFOS() << ptr->mName << LL_ENDL;
+                    unused.emplace_back(ptr->mName);
                 }
             }
         }
@@ -170,36 +183,43 @@ void LLGLSLShader::clearStats()
     mBinds = 0;
 }
 
-void LLGLSLShader::dumpStats()
+void LLGLSLShader::dumpStats(boost::json::object& stats)
 {
-    if (mBinds > 0)
+    stats.emplace("name", mName);
+    auto filesit = stats.emplace("files", boost::json::array_kind).first;
+    auto& files = filesit->value().as_array();
+    LL_INFOS() << "=============================================" << LL_ENDL;
+    LL_INFOS() << mName << LL_ENDL;
+    for (U32 i = 0; i < mShaderFiles.size(); ++i)
     {
-        LL_INFOS() << "=============================================" << LL_ENDL;
-        LL_INFOS() << mName << LL_ENDL;
-        for (U32 i = 0; i < mShaderFiles.size(); ++i)
-        {
-            LL_INFOS() << mShaderFiles[i].first << LL_ENDL;
-        }
-        LL_INFOS() << "=============================================" << LL_ENDL;
+        LL_INFOS() << mShaderFiles[i].first << LL_ENDL;
+        files.emplace_back(mShaderFiles[i].first);
+    }
+    LL_INFOS() << "=============================================" << LL_ENDL;
 
-        F32 ms = mTimeElapsed / 1000000.f;
-        F32 seconds = ms / 1000.f;
+    constexpr float  mega = 1'000'000.f;
+    constexpr double giga = 1'000'000'000.0;
+    F32 ms = mTimeElapsed / mega;
+    F32 seconds = ms / 1000.f;
 
-        F32 pct_tris = (F32)mTrianglesDrawn / (F32)sTotalTrianglesDrawn * 100.f;
-        F32 tris_sec = (F32)(mTrianglesDrawn / 1000000.0);
-        tris_sec /= seconds;
+    F32 pct_tris = (F32)mTrianglesDrawn / (F32)sTotalTrianglesDrawn * 100.f;
+    F32 tris_sec = (F32)(mTrianglesDrawn / mega);
+    tris_sec /= seconds;
 
-        F32 pct_samples = (F32)((F64)mSamplesDrawn / (F64)sTotalSamplesDrawn) * 100.f;
-        F32 samples_sec = (F32)(mSamplesDrawn / 1000000000.0);
-        samples_sec /= seconds;
+    F32 pct_samples = (F32)((F64)mSamplesDrawn / (F64)sTotalSamplesDrawn) * 100.f;
+    F32 samples_sec = (F32)(mSamplesDrawn / giga);
+    samples_sec /= seconds;
 
-        F32 pct_binds = (F32)mBinds / (F32)sTotalBinds * 100.f;
+    F32 pct_binds = (F32)mBinds / (F32)sTotalBinds * 100.f;
 
-        LL_INFOS() << "Triangles Drawn: " << mTrianglesDrawn << " " << llformat("(%.2f pct of total, %.3f million/sec)", pct_tris, tris_sec) << LL_ENDL;
-        LL_INFOS() << "Binds: " << mBinds << " " << llformat("(%.2f pct of total)", pct_binds) << LL_ENDL;
-        LL_INFOS() << "SamplesDrawn: " << mSamplesDrawn << " " << llformat("(%.2f pct of total, %.3f billion/sec)", pct_samples, samples_sec) << LL_ENDL;
-        LL_INFOS() << "Time Elapsed: " << mTimeElapsed << " " << llformat("(%.2f pct of total, %.5f ms)\n", (F32)((F64)mTimeElapsed / (F64)sTotalTimeElapsed) * 100.f, ms) << LL_ENDL;
-    }
+    LL_INFOS() << "Triangles Drawn: " << mTrianglesDrawn << " " << llformat("(%.2f pct of total, %.3f million/sec)", pct_tris, tris_sec) << LL_ENDL;
+    LL_INFOS() << "Binds: " << mBinds << " " << llformat("(%.2f pct of total)", pct_binds) << LL_ENDL;
+    LL_INFOS() << "SamplesDrawn: " << mSamplesDrawn << " " << llformat("(%.2f pct of total, %.3f billion/sec)", pct_samples, samples_sec) << LL_ENDL;
+    LL_INFOS() << "Time Elapsed: " << mTimeElapsed << " " << llformat("(%.2f pct of total, %.5f ms)\n", (F32)((F64)mTimeElapsed / (F64)sTotalTimeElapsed) * 100.f, ms) << LL_ENDL;
+    stats.emplace("time", seconds);
+    stats.emplace("binds", mBinds);
+    stats.emplace("samples", mSamplesDrawn);
+    stats.emplace("triangles", mTrianglesDrawn);
 }
 
 //static
@@ -1087,17 +1107,17 @@ void LLGLSLShader::unbind(void)
     sCurBoundShaderPtr = NULL;
 }
 
-S32 LLGLSLShader::bindTexture(const std::string& uniform, LLTexture* texture, LLTexUnit::eTextureType mode, LLTexUnit::eTextureColorSpace colorspace)
+S32 LLGLSLShader::bindTexture(const std::string& uniform, LLTexture* texture, LLTexUnit::eTextureType mode)
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_SHADER;
 
     S32 channel = 0;
     channel = getUniformLocation(uniform);
 
-    return bindTexture(channel, texture, mode, colorspace);
+    return bindTexture(channel, texture, mode);
 }
 
-S32 LLGLSLShader::bindTexture(S32 uniform, LLTexture* texture, LLTexUnit::eTextureType mode, LLTexUnit::eTextureColorSpace colorspace)
+S32 LLGLSLShader::bindTexture(S32 uniform, LLTexture* texture, LLTexUnit::eTextureType mode)
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_SHADER;
 
@@ -1113,7 +1133,6 @@ S32 LLGLSLShader::bindTexture(S32 uniform, LLTexture* texture, LLTexUnit::eTextu
     if (uniform > -1)
     {
         gGL.getTexUnit(uniform)->bindFast(texture);
-        gGL.getTexUnit(uniform)->setTextureColorSpace(colorspace);
     }
 
     return uniform;
@@ -1194,7 +1213,7 @@ S32 LLGLSLShader::getTextureChannel(S32 uniform) const
     return mTexture[uniform];
 }
 
-S32 LLGLSLShader::enableTexture(S32 uniform, LLTexUnit::eTextureType mode, LLTexUnit::eTextureColorSpace space)
+S32 LLGLSLShader::enableTexture(S32 uniform, LLTexUnit::eTextureType mode)
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_SHADER;
 
@@ -1211,12 +1230,11 @@ S32 LLGLSLShader::enableTexture(S32 uniform, LLTexUnit::eTextureType mode, LLTex
     {
         gGL.getTexUnit(index)->activate();
         gGL.getTexUnit(index)->enable(mode);
-        gGL.getTexUnit(index)->setTextureColorSpace(space);
     }
     return index;
 }
 
-S32 LLGLSLShader::disableTexture(S32 uniform, LLTexUnit::eTextureType mode, LLTexUnit::eTextureColorSpace space)
+S32 LLGLSLShader::disableTexture(S32 uniform, LLTexUnit::eTextureType mode)
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_SHADER;
 
@@ -1229,7 +1247,7 @@ S32 LLGLSLShader::disableTexture(S32 uniform, LLTexUnit::eTextureType mode, LLTe
     S32 index = mTexture[uniform];
     if (index != -1 && gGL.getTexUnit(index)->getCurrType() != LLTexUnit::TT_NONE)
     {
-        if (gDebugGL && gGL.getTexUnit(index)->getCurrType() != mode && gGL.getTexUnit(index)->getCurrColorSpace() != space)
+        if (gDebugGL && gGL.getTexUnit(index)->getCurrType() != mode)
         {
             if (gDebugSession)
             {
@@ -1552,6 +1570,34 @@ void LLGLSLShader::uniform4fv(U32 index, U32 count, const GLfloat* v)
     }
 }
 
+void LLGLSLShader::uniform4uiv(U32 index, U32 count, const GLuint* v)
+{
+    LL_PROFILE_ZONE_SCOPED_CATEGORY_SHADER;
+    llassert(sCurBoundShaderPtr == this);
+
+    if (mProgramObject)
+    {
+        if (mUniform.size() <= index)
+        {
+            LL_WARNS_ONCE("Shader") << "Uniform index out of bounds. Size: " << (S32)mUniform.size() << " index: " << index << LL_ENDL;
+            llassert(false);
+            return;
+        }
+
+        if (mUniform[index] >= 0)
+        {
+            const auto& iter = mValue.find(mUniform[index]);
+            LLVector4 vec((F32)v[0], (F32)v[1], (F32)v[2], (F32)v[3]);
+            if (iter == mValue.end() || shouldChange(iter->second, vec) || count != 1)
+            {
+                LL_PROFILE_ZONE_SCOPED_CATEGORY_SHADER;
+                glUniform4uiv(mUniform[index], count, v);
+                mValue[mUniform[index]] = vec;
+            }
+        }
+    }
+}
+
 void LLGLSLShader::uniformMatrix2fv(U32 index, U32 count, GLboolean transpose, const GLfloat* v)
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_SHADER;
@@ -1886,6 +1932,24 @@ void LLGLSLShader::uniform4fv(const LLStaticHashedString& uniform, U32 count, co
     }
 }
 
+void LLGLSLShader::uniform4uiv(const LLStaticHashedString& uniform, U32 count, const GLuint* v)
+{
+    LL_PROFILE_ZONE_SCOPED_CATEGORY_SHADER;
+    GLint location = getUniformLocation(uniform);
+
+    if (location >= 0)
+    {
+        LLVector4 vec((F32)v[0], (F32)v[1], (F32)v[2], (F32)v[3]);
+        const auto& iter = mValue.find(location);
+        if (iter == mValue.end() || shouldChange(iter->second, vec) || count != 1)
+        {
+            LL_PROFILE_ZONE_SCOPED_CATEGORY_SHADER;
+            glUniform4uiv(location, count, v);
+            mValue[location] = vec;
+        }
+    }
+}
+
 void LLGLSLShader::uniformMatrix4fv(const LLStaticHashedString& uniform, U32 count, GLboolean transpose, const GLfloat* v)
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_SHADER;
diff --git a/indra/llrender/llglslshader.h b/indra/llrender/llglslshader.h
index 86e5625dca..2d669c70a9 100644
--- a/indra/llrender/llglslshader.h
+++ b/indra/llrender/llglslshader.h
@@ -30,6 +30,7 @@
 #include "llgl.h"
 #include "llrender.h"
 #include "llstaticstringtable.h"
+#include <boost/json.hpp>
 #include <unordered_map>
 
 class LLShaderFeatures
@@ -169,14 +170,14 @@ public:
     static U32 sMaxGLTFNodes;
 
     static void initProfile();
-    static void finishProfile(bool emit_report = true);
+    static void finishProfile(boost::json::value& stats=sDefaultStats);
 
     static void startProfile();
     static void stopProfile();
 
     void unload();
     void clearStats();
-    void dumpStats();
+    void dumpStats(boost::json::object& stats);
 
     // place query objects for profiling if profiling is enabled
     // if for_runtime is true, will place timer query only whether or not profiling is enabled
@@ -208,6 +209,7 @@ public:
     void uniform2fv(U32 index, U32 count, const GLfloat* v);
     void uniform3fv(U32 index, U32 count, const GLfloat* v);
     void uniform4fv(U32 index, U32 count, const GLfloat* v);
+    void uniform4uiv(U32 index, U32 count, const GLuint* v);
     void uniform2i(const LLStaticHashedString& uniform, GLint i, GLint j);
     void uniformMatrix2fv(U32 index, U32 count, GLboolean transpose, const GLfloat* v);
     void uniformMatrix3fv(U32 index, U32 count, GLboolean transpose, const GLfloat* v);
@@ -223,6 +225,7 @@ public:
     void uniform2fv(const LLStaticHashedString& uniform, U32 count, const GLfloat* v);
     void uniform3fv(const LLStaticHashedString& uniform, U32 count, const GLfloat* v);
     void uniform4fv(const LLStaticHashedString& uniform, U32 count, const GLfloat* v);
+    void uniform4uiv(const LLStaticHashedString& uniform, U32 count, const GLuint* v);
     void uniformMatrix4fv(const LLStaticHashedString& uniform, U32 count, GLboolean transpose, const GLfloat* v);
 
     void setMinimumAlpha(F32 minimum);
@@ -239,6 +242,10 @@ public:
 
     void clearPermutations();
     void addPermutation(std::string name, std::string value);
+    void addPermutations(const std::map<std::string, std::string>& defines)
+    {
+        mDefines.insert(defines.begin(), defines.end());
+    }
     void removePermutation(std::string name);
 
     void addConstant(const LLGLSLShader::eShaderConsts shader_const);
@@ -247,16 +254,16 @@ public:
     //if given texture uniform is active in the shader,
     //the corresponding channel will be active upon return
     //returns channel texture is enabled in from [0-MAX)
-    S32 enableTexture(S32 uniform, LLTexUnit::eTextureType mode = LLTexUnit::TT_TEXTURE, LLTexUnit::eTextureColorSpace space = LLTexUnit::TCS_LINEAR);
-    S32 disableTexture(S32 uniform, LLTexUnit::eTextureType mode = LLTexUnit::TT_TEXTURE, LLTexUnit::eTextureColorSpace space = LLTexUnit::TCS_LINEAR);
+    S32 enableTexture(S32 uniform, LLTexUnit::eTextureType mode = LLTexUnit::TT_TEXTURE);
+    S32 disableTexture(S32 uniform, LLTexUnit::eTextureType mode = LLTexUnit::TT_TEXTURE);
 
     // get the texture channel of the given uniform, or -1 if uniform is not used as a texture
     S32 getTextureChannel(S32 uniform) const;
 
     // bindTexture returns the texture unit we've bound the texture to.
     // You can reuse the return value to unbind a texture when required.
-    S32 bindTexture(const std::string& uniform, LLTexture* texture, LLTexUnit::eTextureType mode = LLTexUnit::TT_TEXTURE, LLTexUnit::eTextureColorSpace space = LLTexUnit::TCS_LINEAR);
-    S32 bindTexture(S32 uniform, LLTexture* texture, LLTexUnit::eTextureType mode = LLTexUnit::TT_TEXTURE, LLTexUnit::eTextureColorSpace space = LLTexUnit::TCS_LINEAR);
+    S32 bindTexture(const std::string& uniform, LLTexture* texture, LLTexUnit::eTextureType mode = LLTexUnit::TT_TEXTURE);
+    S32 bindTexture(S32 uniform, LLTexture* texture, LLTexUnit::eTextureType mode = LLTexUnit::TT_TEXTURE);
     S32 bindTexture(const std::string& uniform, LLRenderTarget* texture, bool depth = false, LLTexUnit::eTextureFilterOptions mode = LLTexUnit::TFO_BILINEAR);
     S32 bindTexture(S32 uniform, LLRenderTarget* texture, bool depth = false, LLTexUnit::eTextureFilterOptions mode = LLTexUnit::TFO_BILINEAR, U32 index = 0);
     S32 unbindTexture(const std::string& uniform, LLTexUnit::eTextureType mode = LLTexUnit::TT_TEXTURE);
@@ -357,6 +364,11 @@ public:
 
 private:
     void unloadInternal();
+    // This must be static because finishProfile() is called at least once
+    // within a __try block. If we default its stats parameter to a temporary
+    // json::value, that temporary must be destroyed when the stack is
+    // unwound, which __try forbids.
+    static boost::json::value sDefaultStats;
 };
 
 //UI shader (declared here so llui_libtest will link properly)
diff --git a/indra/llrender/llimagegl.cpp b/indra/llrender/llimagegl.cpp
index e4b176ff69..26e6aad770 100644
--- a/indra/llrender/llimagegl.cpp
+++ b/indra/llrender/llimagegl.cpp
@@ -51,6 +51,7 @@ extern LL_COMMON_API bool on_main_thread();
 
 //----------------------------------------------------------------------------
 const F32 MIN_TEXTURE_LIFETIME = 10.f;
+const F32 CONVERSION_SCRATCH_BUFFER_GL_VERSION = 3.29f;
 
 //which power of 2 is i?
 //assumes i is a power of 2 > 0
@@ -67,12 +68,13 @@ static U64 sTextureBytes = 0;
 
 // track a texture alloc on the currently bound texture.
 // asserts that no currently tracked alloc exists
-void LLImageGLMemory::alloc_tex_image(U32 width, U32 height, U32 pixformat)
+void LLImageGLMemory::alloc_tex_image(U32 width, U32 height, U32 intformat, U32 count)
 {
     U32 texUnit = gGL.getCurrentTexUnitIndex();
     llassert(texUnit == 0); // allocations should always be done on tex unit 0
     U32 texName = gGL.getTexUnit(texUnit)->getCurrTexture();
-    U64 size = LLImageGL::dataFormatBytes(pixformat, width, height);
+    U64 size = LLImageGL::dataFormatBytes(intformat, width, height);
+    size *= count;
 
     llassert(size >= 0);
 
@@ -159,6 +161,7 @@ S32 LLImageGL::sMaxCategories = 1 ;
 bool LLImageGL::sSkipAnalyzeAlpha;
 U32  LLImageGL::sScratchPBO = 0;
 U32  LLImageGL::sScratchPBOSize = 0;
+U32* LLImageGL::sManualScratch = nullptr;
 
 
 //------------------------
@@ -261,6 +264,22 @@ void LLImageGL::initClass(LLWindow* window, S32 num_catagories, bool skip_analyz
     }
 }
 
+void LLImageGL::allocateConversionBuffer()
+{
+    if (gGLManager.mGLVersion < CONVERSION_SCRATCH_BUFFER_GL_VERSION)
+    {
+        try
+        {
+            sManualScratch = new U32[MAX_IMAGE_AREA];
+        }
+        catch (std::bad_alloc&)
+        {
+            LLError::LLUserWarningMsg::showOutOfMemory();
+            LL_ERRS() << "Failed to allocate sManualScratch" << LL_ENDL;
+        }
+    }
+}
+
 //static
 void LLImageGL::cleanupClass()
 {
@@ -272,6 +291,8 @@ void LLImageGL::cleanupClass()
         sScratchPBO = 0;
         sScratchPBOSize = 0;
     }
+
+    delete[] sManualScratch;
 }
 
 
@@ -280,6 +301,15 @@ S32 LLImageGL::dataFormatBits(S32 dataformat)
 {
     switch (dataformat)
     {
+    case GL_COMPRESSED_RED:                         return 8;
+    case GL_COMPRESSED_RG:                          return 16;
+    case GL_COMPRESSED_RGB:                         return 24;
+    case GL_COMPRESSED_SRGB:                        return 32;
+    case GL_COMPRESSED_RGBA:                        return 32;
+    case GL_COMPRESSED_SRGB_ALPHA:                  return 32;
+    case GL_COMPRESSED_LUMINANCE:                   return 8;
+    case GL_COMPRESSED_LUMINANCE_ALPHA:             return 16;
+    case GL_COMPRESSED_ALPHA:                       return 8;
     case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:          return 4;
     case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:    return 4;
     case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:          return 8;
@@ -287,21 +317,35 @@ S32 LLImageGL::dataFormatBits(S32 dataformat)
     case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:          return 8;
     case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:    return 8;
     case GL_LUMINANCE:                              return 8;
+    case GL_LUMINANCE8:                             return 8;
     case GL_ALPHA:                                  return 8;
+    case GL_ALPHA8:                                 return 8;
     case GL_RED:                                    return 8;
+    case GL_R8:                                     return 8;
     case GL_COLOR_INDEX:                            return 8;
     case GL_LUMINANCE_ALPHA:                        return 16;
+    case GL_LUMINANCE8_ALPHA8:                      return 16;
+    case GL_RG:                                     return 16;
+    case GL_RG8:                                    return 16;
     case GL_RGB:                                    return 24;
     case GL_SRGB:                                   return 24;
     case GL_RGB8:                                   return 24;
     case GL_RGBA:                                   return 32;
+    case GL_RGBA8:                                  return 32;
     case GL_SRGB_ALPHA:                             return 32;
     case GL_BGRA:                                   return 32;      // Used for QuickTime media textures on the Mac
     case GL_DEPTH_COMPONENT:                        return 24;
+    case GL_DEPTH_COMPONENT24:                      return 24;
+    case GL_R16F:                                   return 16;
+    case GL_RG16F:                                  return 32;
     case GL_RGB16F:                                 return 48;
     case GL_RGBA16F:                                return 64;
+    case GL_R32F:                                   return 32;
+    case GL_RG32F:                                  return 64;
+    case GL_RGB32F:                                 return 96;
+    case GL_RGBA32F:                                return 128;
     default:
-        LL_ERRS() << "LLImageGL::Unknown format: " << dataformat << LL_ENDL;
+        LL_ERRS() << "LLImageGL::Unknown format: " << std::hex << dataformat << std::dec << LL_ENDL;
         return 0;
     }
 }
@@ -344,13 +388,14 @@ S32 LLImageGL::dataFormatComponents(S32 dataformat)
       case GL_RED:                              return 1;
       case GL_COLOR_INDEX:                      return 1;
       case GL_LUMINANCE_ALPHA:                  return 2;
+      case GL_RG:                               return 2;
       case GL_RGB:                              return 3;
       case GL_SRGB:                             return 3;
       case GL_RGBA:                             return 4;
       case GL_SRGB_ALPHA:                       return 4;
       case GL_BGRA:                             return 4;       // Used for QuickTime media textures on the Mac
       default:
-        LL_ERRS() << "LLImageGL::Unknown format: " << dataformat << LL_ENDL;
+        LL_ERRS() << "LLImageGL::Unknown format: " << std::hex << dataformat << std::dec << LL_ENDL;
         return 0;
     }
 }
@@ -411,29 +456,29 @@ bool LLImageGL::create(LLPointer<LLImageGL>& dest, const LLImageRaw* imageraw, b
 
 //----------------------------------------------------------------------------
 
-LLImageGL::LLImageGL(bool usemipmaps)
+LLImageGL::LLImageGL(bool usemipmaps/* = true*/, bool allow_compression/* = true*/)
 :   mSaveData(0), mExternalTexture(false)
 {
-    init(usemipmaps);
+    init(usemipmaps, allow_compression);
     setSize(0, 0, 0);
     sImageList.insert(this);
     sCount++;
 }
 
-LLImageGL::LLImageGL(U32 width, U32 height, U8 components, bool usemipmaps)
+LLImageGL::LLImageGL(U32 width, U32 height, U8 components, bool usemipmaps/* = true*/, bool allow_compression/* = true*/)
 :   mSaveData(0), mExternalTexture(false)
 {
     llassert( components <= 4 );
-    init(usemipmaps);
+    init(usemipmaps, allow_compression);
     setSize(width, height, components);
     sImageList.insert(this);
     sCount++;
 }
 
-LLImageGL::LLImageGL(const LLImageRaw* imageraw, bool usemipmaps)
+LLImageGL::LLImageGL(const LLImageRaw* imageraw, bool usemipmaps/* = true*/, bool allow_compression/* = true*/)
 :   mSaveData(0), mExternalTexture(false)
 {
-    init(usemipmaps);
+    init(usemipmaps, allow_compression);
     setSize(0, 0, 0);
     sImageList.insert(this);
     sCount++;
@@ -450,7 +495,7 @@ LLImageGL::LLImageGL(
     LLGLenum formatType,
     LLTexUnit::eTextureAddressMode addressMode)
 {
-    init(false);
+    init(false, true);
     mTexName = texName;
     mTarget = target;
     mComponents = components;
@@ -472,7 +517,7 @@ LLImageGL::~LLImageGL()
     }
 }
 
-void LLImageGL::init(bool usemipmaps)
+void LLImageGL::init(bool usemipmaps, bool allow_compression)
 {
 #if LL_IMAGEGL_THREAD_CHECK
     mActiveThread = LLThread::currentID();
@@ -502,7 +547,7 @@ void LLImageGL::init(bool usemipmaps)
     mHeight = 0;
     mCurrentDiscardLevel = -1;
 
-    mAllowCompression = true;
+    mAllowCompression = allow_compression;
 
     mTarget = GL_TEXTURE_2D;
     mBindTarget = LLTexUnit::TT_TEXTURE;
@@ -1020,15 +1065,47 @@ void sub_image_lines(U32 target, S32 miplevel, S32 x_offset, S32 y_offset, S32 w
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
 
+    LL_PROFILE_ZONE_NUM(width);
+    LL_PROFILE_ZONE_NUM(height);
+
     U32 components = LLImageGL::dataFormatComponents(pixformat);
     U32 type_width = type_width_from_pixtype(pixtype);
 
     const U32 line_width = data_width * components * type_width;
     const U32 y_offset_end = y_offset + height;
-    for (U32 y_pos = y_offset; y_pos < y_offset_end; ++y_pos)
+
+    if (width == data_width && height % 32 == 0)
+    {
+        LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("subimage - batched lines");
+
+        // full width, batch multiple lines at a time
+        // set batch size based on width
+        U32 batch_size = 32;
+
+        if (width > 1024)
+        {
+            batch_size = 8;
+        }
+        else if (width > 512)
+        {
+            batch_size = 16;
+        }
+
+        // full width texture, do 32 lines at a time
+        for (U32 y_pos = y_offset; y_pos < y_offset_end; y_pos += batch_size)
+        {
+            glTexSubImage2D(target, miplevel, x_offset, y_pos, width, batch_size, pixformat, pixtype, src);
+            src += line_width * batch_size;
+        }
+    }
+    else
     {
-        glTexSubImage2D(target, miplevel, x_offset, y_pos, width, 1, pixformat, pixtype, src);
-        src += line_width;
+        // partial width or strange height
+        for (U32 y_pos = y_offset; y_pos < y_offset_end; y_pos += 1)
+        {
+            glTexSubImage2D(target, miplevel, x_offset, y_pos, width, 1, pixformat, pixtype, src);
+            src += line_width;
+        }
     }
 }
 
@@ -1230,90 +1307,97 @@ void LLImageGL::deleteTextures(S32 numTextures, const U32 *textures)
 void LLImageGL::setManualImage(U32 target, S32 miplevel, S32 intformat, S32 width, S32 height, U32 pixformat, U32 pixtype, const void* pixels, bool allow_compression)
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
-    bool use_scratch = false;
-    U32* scratch = NULL;
     if (LLRender::sGLCoreProfile)
     {
-        if (pixformat == GL_ALPHA && pixtype == GL_UNSIGNED_BYTE)
-        { //GL_ALPHA is deprecated, convert to RGBA
-            if (pixels != nullptr)
-            {
-                use_scratch = true;
-                scratch = new(std::nothrow) U32[width * height];
-                if (!scratch)
-                {
-                    LLError::LLUserWarningMsg::showOutOfMemory();
-                    LL_ERRS() << "Failed to allocate " << (U32)(width * height * sizeof(U32))
-                              << " bytes for a manual image W" << width << " H" << height << LL_ENDL;
-                }
+        LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
+        if (gGLManager.mGLVersion >= CONVERSION_SCRATCH_BUFFER_GL_VERSION)
+        {
+            if (pixformat == GL_ALPHA)
+            { //GL_ALPHA is deprecated, convert to RGBA
+                const GLint mask[] = { GL_ZERO, GL_ZERO, GL_ZERO, GL_RED };
+                glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, mask);
+                pixformat = GL_RED;
+                intformat = GL_R8;
+            }
 
-                U32 pixel_count = (U32)(width * height);
-                for (U32 i = 0; i < pixel_count; i++)
-                {
-                    U8* pix = (U8*)&scratch[i];
-                    pix[0] = pix[1] = pix[2] = 0;
-                    pix[3] = ((U8*)pixels)[i];
-                }
+            if (pixformat == GL_LUMINANCE)
+            { //GL_LUMINANCE is deprecated, convert to GL_RGBA
+                const GLint mask[] = { GL_RED, GL_RED, GL_RED, GL_ONE };
+                glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, mask);
+                pixformat = GL_RED;
+                intformat = GL_R8;
             }
 
-            pixformat = GL_RGBA;
-            intformat = GL_RGBA8;
+            if (pixformat == GL_LUMINANCE_ALPHA)
+            { //GL_LUMINANCE_ALPHA is deprecated, convert to RGBA
+                const GLint mask[] = { GL_RED, GL_RED, GL_RED, GL_GREEN };
+                glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, mask);
+                pixformat = GL_RG;
+                intformat = GL_RG8;
+            }
         }
-
-        if (pixformat == GL_LUMINANCE_ALPHA && pixtype == GL_UNSIGNED_BYTE)
-        { //GL_LUMINANCE_ALPHA is deprecated, convert to RGBA
-            if (pixels != nullptr)
-            {
-                use_scratch = true;
-                scratch = new(std::nothrow) U32[width * height];
-                if (!scratch)
+        else
+        {
+            if (pixformat == GL_ALPHA && pixtype == GL_UNSIGNED_BYTE)
+            { //GL_ALPHA is deprecated, convert to RGBA
+                if (pixels != nullptr)
                 {
-                    LLError::LLUserWarningMsg::showOutOfMemory();
-                    LL_ERRS() << "Failed to allocate " << (U32)(width * height * sizeof(U32))
-                        << " bytes for a manual image W" << width << " H" << height << LL_ENDL;
+                    U32 pixel_count = (U32)(width * height);
+                    for (U32 i = 0; i < pixel_count; i++)
+                    {
+                        U8* pix = (U8*)&sManualScratch[i];
+                        pix[0] = pix[1] = pix[2] = 0;
+                        pix[3] = ((U8*)pixels)[i];
+                    }
+
+                    pixels = sManualScratch;
                 }
 
-                U32 pixel_count = (U32)(width * height);
-                for (U32 i = 0; i < pixel_count; i++)
+                pixformat = GL_RGBA;
+                intformat = GL_RGBA8;
+            }
+
+            if (pixformat == GL_LUMINANCE_ALPHA && pixtype == GL_UNSIGNED_BYTE)
+            { //GL_LUMINANCE_ALPHA is deprecated, convert to RGBA
+                if (pixels != nullptr)
                 {
-                    U8 lum = ((U8*)pixels)[i * 2 + 0];
-                    U8 alpha = ((U8*)pixels)[i * 2 + 1];
+                    U32 pixel_count = (U32)(width * height);
+                    for (U32 i = 0; i < pixel_count; i++)
+                    {
+                        U8 lum = ((U8*)pixels)[i * 2 + 0];
+                        U8 alpha = ((U8*)pixels)[i * 2 + 1];
+
+                        U8* pix = (U8*)&sManualScratch[i];
+                        pix[0] = pix[1] = pix[2] = lum;
+                        pix[3] = alpha;
+                    }
 
-                    U8* pix = (U8*)&scratch[i];
-                    pix[0] = pix[1] = pix[2] = lum;
-                    pix[3] = alpha;
+                    pixels = sManualScratch;
                 }
-            }
 
-            pixformat = GL_RGBA;
-            intformat = GL_RGBA8;
-        }
+                pixformat = GL_RGBA;
+                intformat = GL_RGBA8;
+            }
 
-        if (pixformat == GL_LUMINANCE && pixtype == GL_UNSIGNED_BYTE)
-        { //GL_LUMINANCE_ALPHA is deprecated, convert to RGB
-            if (pixels != nullptr)
-            {
-                use_scratch = true;
-                scratch = new(std::nothrow) U32[width * height];
-                if (!scratch)
+            if (pixformat == GL_LUMINANCE && pixtype == GL_UNSIGNED_BYTE)
+            { //GL_LUMINANCE_ALPHA is deprecated, convert to RGB
+                if (pixels != nullptr)
                 {
-                    LLError::LLUserWarningMsg::showOutOfMemory();
-                    LL_ERRS() << "Failed to allocate " << (U32)(width * height * sizeof(U32))
-                        << " bytes for a manual image W" << width << " H" << height << LL_ENDL;
-                }
+                    U32 pixel_count = (U32)(width * height);
+                    for (U32 i = 0; i < pixel_count; i++)
+                    {
+                        U8 lum = ((U8*)pixels)[i];
 
-                U32 pixel_count = (U32)(width * height);
-                for (U32 i = 0; i < pixel_count; i++)
-                {
-                    U8 lum = ((U8*)pixels)[i];
+                        U8* pix = (U8*)&sManualScratch[i];
+                        pix[0] = pix[1] = pix[2] = lum;
+                        pix[3] = 255;
+                    }
 
-                    U8* pix = (U8*)&scratch[i];
-                    pix[0] = pix[1] = pix[2] = lum;
-                    pix[3] = 255;
+                    pixels = sManualScratch;
                 }
+                pixformat = GL_RGBA;
+                intformat = GL_RGB8;
             }
-            pixformat = GL_RGBA;
-            intformat = GL_RGB8;
         }
     }
 
@@ -1322,6 +1406,14 @@ void LLImageGL::setManualImage(U32 target, S32 miplevel, S32 intformat, S32 widt
     {
         switch (intformat)
         {
+        case GL_RED:
+        case GL_R8:
+            intformat = GL_COMPRESSED_RED;
+            break;
+        case GL_RG:
+        case GL_RG8:
+            intformat = GL_COMPRESSED_RG;
+            break;
         case GL_RGB:
         case GL_RGB8:
             intformat = GL_COMPRESSED_RGB;
@@ -1350,12 +1442,8 @@ void LLImageGL::setManualImage(U32 target, S32 miplevel, S32 intformat, S32 widt
         case GL_ALPHA8:
             intformat = GL_COMPRESSED_ALPHA;
             break;
-        case GL_RED:
-        case GL_R8:
-            intformat = GL_COMPRESSED_RED;
-            break;
         default:
-            LL_WARNS() << "Could not compress format: " << std::hex << intformat << LL_ENDL;
+            LL_WARNS() << "Could not compress format: " << std::hex << intformat << std::dec << LL_ENDL;
             break;
         }
     }
@@ -1371,7 +1459,7 @@ void LLImageGL::setManualImage(U32 target, S32 miplevel, S32 intformat, S32 widt
         if (!use_sub_image)
         {
             LL_PROFILE_ZONE_NAMED("glTexImage2D alloc + copy");
-            glTexImage2D(target, miplevel, intformat, width, height, 0, pixformat, pixtype, use_scratch ? scratch : pixels);
+            glTexImage2D(target, miplevel, intformat, width, height, 0, pixformat, pixtype, pixels);
         }
         else
         {
@@ -1381,21 +1469,16 @@ void LLImageGL::setManualImage(U32 target, S32 miplevel, S32 intformat, S32 widt
                 glTexImage2D(target, miplevel, intformat, width, height, 0, pixformat, pixtype, nullptr);
             }
 
-            U8* src = (U8*)(use_scratch ? scratch : pixels);
+            U8* src = (U8*)(pixels);
             if (src)
             {
                 LL_PROFILE_ZONE_NAMED("glTexImage2D copy");
                 sub_image_lines(target, miplevel, 0, 0, width, height, pixformat, pixtype, src, width);
             }
         }
-        alloc_tex_image(width, height, pixformat);
+        alloc_tex_image(width, height, intformat, 1);
     }
     stop_glerror();
-
-    if (use_scratch)
-    {
-        delete[] scratch;
-    }
 }
 
 //create an empty GL texture: just create a texture name
@@ -2083,6 +2166,8 @@ void LLImageGL::analyzeAlpha(const void* data_in, U32 w, U32 h)
         return ;
     }
 
+    LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
+
     U32 length = w * h;
     U32 alphatotal = 0;
 
@@ -2094,15 +2179,15 @@ void LLImageGL::analyzeAlpha(const void* data_in, U32 w, U32 h)
     // this will mid-skew the data (and thus increase the chances of not
     // being used as a mask) from high-frequency alpha maps which
     // suffer the worst from aliasing when used as alpha masks.
-    if (w >= 2 && h >= 2)
+    if (w >= 4 && h >= 4)
     {
-        llassert(w%2 == 0);
-        llassert(h%2 == 0);
+        llassert(w%4 == 0);
+        llassert(h%4 == 0);
         const GLubyte* rowstart = ((const GLubyte*) data_in) + mAlphaOffset;
-        for (U32 y = 0; y < h; y+=2)
+        for (U32 y = 0; y < h; y+=4)
         {
             const GLubyte* current = rowstart;
-            for (U32 x = 0; x < w; x+=2)
+            for (U32 x = 0; x < w; x+=4)
             {
                 const U32 s1 = current[0];
                 alphatotal += s1;
@@ -2126,7 +2211,7 @@ void LLImageGL::analyzeAlpha(const void* data_in, U32 w, U32 h)
             }
 
 
-            rowstart += 2 * w * mAlphaStride;
+            rowstart += 4 * w * mAlphaStride;
         }
         length *= 2; // we sampled everything twice, essentially
     }
@@ -2374,11 +2459,11 @@ bool LLImageGL::scaleDown(S32 desired_discard)
         gGL.getTexUnit(0)->bindManual(LLTexUnit::TT_TEXTURE, temp_texname, true);
         {
             LL_PROFILE_ZONE_NAMED_CATEGORY_TEXTURE("scaleDown - glTexImage2D");
-            glTexImage2D(mTarget, 0, mFormatPrimary, desired_width, desired_height, 0, mFormatPrimary, mFormatType, NULL);
+            glTexImage2D(mTarget, 0, mFormatInternal, desired_width, desired_height, 0, mFormatPrimary, mFormatType, NULL);
         }
 
         // account for new texture getting created
-        alloc_tex_image(desired_width, desired_height, mFormatPrimary);
+        alloc_tex_image(desired_width, desired_height, mFormatInternal, 1);
 
         // Use render-to-texture to scale down the texture
         {
@@ -2432,10 +2517,10 @@ bool LLImageGL::scaleDown(S32 desired_discard)
         glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
 
         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, sScratchPBO);
-        glTexImage2D(mTarget, 0, mFormatPrimary, desired_width, desired_height, 0, mFormatPrimary, mFormatType, nullptr);
+        glTexImage2D(mTarget, 0, mFormatInternal, desired_width, desired_height, 0, mFormatPrimary, mFormatType, nullptr);
         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
 
-        alloc_tex_image(desired_width, desired_height, mFormatPrimary);
+        alloc_tex_image(desired_width, desired_height, mFormatInternal, 1);
 
         if (mHasMipMaps)
         {
diff --git a/indra/llrender/llimagegl.h b/indra/llrender/llimagegl.h
index 5073701c30..6b4492c09e 100644
--- a/indra/llrender/llimagegl.h
+++ b/indra/llrender/llimagegl.h
@@ -50,7 +50,7 @@ class LLWindow;
 
 namespace LLImageGLMemory
 {
-    void alloc_tex_image(U32 width, U32 height, U32 pixformat);
+    void alloc_tex_image(U32 width, U32 height, U32 intformat, U32 count);
     void free_tex_image(U32 texName);
     void free_tex_images(U32 count, const U32* texNames);
     void free_cur_tex_image();
@@ -101,9 +101,9 @@ public:
     static bool create(LLPointer<LLImageGL>& dest, const LLImageRaw* imageraw, bool usemipmaps = true);
 
 public:
-    LLImageGL(bool usemipmaps = true);
-    LLImageGL(U32 width, U32 height, U8 components, bool usemipmaps = true);
-    LLImageGL(const LLImageRaw* imageraw, bool usemipmaps = true);
+    LLImageGL(bool usemipmaps = true, bool allow_compression = true);
+    LLImageGL(U32 width, U32 height, U8 components, bool usemipmaps = true, bool allow_compression = true);
+    LLImageGL(const LLImageRaw* imageraw, bool usemipmaps = true, bool allow_compression = true);
 
     // For wrapping textures created via GL elsewhere with our API only. Use with caution.
     LLImageGL(LLGLuint mTexName, U32 components, LLGLenum target, LLGLint  formatInternal, LLGLenum formatPrimary, LLGLenum formatType, LLTexUnit::eTextureAddressMode addressMode);
@@ -203,7 +203,7 @@ public:
 
     LLGLenum getTexTarget()const { return mTarget; }
 
-    void init(bool usemipmaps);
+    void init(bool usemipmaps, bool allow_compression);
     virtual void cleanup(); // Clean up the LLImageGL so it can be reinitialized.  Be careful when using this in derived class destructors
 
     void setNeedsAlphaAndPickMask(bool need_mask);
@@ -298,6 +298,7 @@ public:
 
 public:
     static void initClass(LLWindow* window, S32 num_catagories, bool skip_analyze_alpha = false, bool thread_texture_loads = false, bool thread_media_updates = false);
+    static void allocateConversionBuffer();
     static void cleanupClass() ;
 
 private:
@@ -305,6 +306,7 @@ private:
     static bool sSkipAnalyzeAlpha;
     static U32 sScratchPBO;
     static U32 sScratchPBOSize;
+    static U32* sManualScratch;
 
     //the flag to allow to call readBackRaw(...).
     //can be removed if we do not use that function at all.
diff --git a/indra/llrender/llrender.cpp b/indra/llrender/llrender.cpp
index 1301d325a0..c8a9fb4893 100644
--- a/indra/llrender/llrender.cpp
+++ b/indra/llrender/llrender.cpp
@@ -36,6 +36,7 @@
 #include "lltexture.h"
 #include "llshadermgr.h"
 #include "hbxxh.h"
+#include "glm/gtc/type_ptr.hpp"
 
 #if LL_WINDOWS
 extern void APIENTRY gl_debug_callback(GLenum source,
@@ -57,8 +58,8 @@ F32 gGLLastProjection[16];
 F32 gGLProjection[16];
 
 // transform from last frame's camera space to this frame's camera space (and inverse)
-F32 gGLDeltaModelView[16];
-F32 gGLInverseDeltaModelView[16];
+glm::mat4 gGLDeltaModelView;
+glm::mat4 gGLInverseDeltaModelView;
 
 S32 gGLViewport[4];
 
@@ -77,6 +78,7 @@ struct LLVBCache
 };
 
 static std::unordered_map<U64, LLVBCache> sVBCache;
+static thread_local std::list<LLVertexBufferData> *sBufferDataList = nullptr;
 
 static const GLenum sGLTextureType[] =
 {
@@ -115,7 +117,7 @@ static const GLenum sGLBlendFactor[] =
 
 LLTexUnit::LLTexUnit(S32 index)
     : mCurrTexType(TT_NONE),
-    mCurrColorScale(1), mCurrAlphaScale(1), mCurrTexture(0), mTexColorSpace(TCS_LINEAR),
+    mCurrColorScale(1), mCurrAlphaScale(1), mCurrTexture(0),
     mHasMipMaps(false),
     mIndex(index)
 {
@@ -145,8 +147,6 @@ void LLTexUnit::refreshState(void)
     {
         glBindTexture(GL_TEXTURE_2D, 0);
     }
-
-    setTextureColorSpace(mTexColorSpace);
 }
 
 void LLTexUnit::activate(void)
@@ -241,7 +241,6 @@ bool LLTexUnit::bind(LLTexture* texture, bool for_rendering, bool forceBind)
                         setTextureAddressMode(gl_tex->mAddressMode);
                         setTextureFilteringOption(gl_tex->mFilterOption);
                     }
-                    setTextureColorSpace(mTexColorSpace);
                 }
             }
             else
@@ -318,7 +317,6 @@ bool LLTexUnit::bind(LLImageGL* texture, bool for_rendering, bool forceBind, S32
             setTextureFilteringOption(texture->mFilterOption);
             stop_glerror();
         }
-        setTextureColorSpace(mTexColorSpace);
     }
 
     stop_glerror();
@@ -354,7 +352,6 @@ bool LLTexUnit::bind(LLCubeMap* cubeMap)
                 setTextureAddressMode(cubeMap->mImages[0]->mAddressMode);
                 setTextureFilteringOption(cubeMap->mImages[0]->mFilterOption);
             }
-            setTextureColorSpace(mTexColorSpace);
             return true;
         }
         else
@@ -403,7 +400,6 @@ bool LLTexUnit::bindManual(eTextureType type, U32 texture, bool hasMips)
         mCurrTexture = texture;
         glBindTexture(sGLTextureType[type], texture);
         mHasMipMaps = hasMips;
-        setTextureColorSpace(mTexColorSpace);
     }
     return true;
 }
@@ -424,8 +420,6 @@ void LLTexUnit::unbind(eTextureType type)
     {
         mCurrTexture = 0;
 
-        // Always make sure our texture color space is reset to linear.  SRGB sampling should be opt-in in the vast majority of cases.  Also prevents color space "popping".
-        mTexColorSpace = TCS_LINEAR;
         if (type == LLTexUnit::TT_TEXTURE)
         {
             glBindTexture(sGLTextureType[type], sWhiteTexture);
@@ -447,8 +441,6 @@ void LLTexUnit::unbindFast(eTextureType type)
     {
         mCurrTexture = 0;
 
-        // Always make sure our texture color space is reset to linear.  SRGB sampling should be opt-in in the vast majority of cases.  Also prevents color space "popping".
-        mTexColorSpace = TCS_LINEAR;
         if (type == LLTexUnit::TT_TEXTURE)
         {
             glBindTexture(sGLTextureType[type], sWhiteTexture);
@@ -642,11 +634,6 @@ void LLTexUnit::debugTextureUnit(void)
     }
 }
 
-void LLTexUnit::setTextureColorSpace(eTextureColorSpace space)
-{
-    mTexColorSpace = space;
-}
-
 LLLightState::LLLightState(S32 index)
 : mIndex(index),
   mEnabled(false),
@@ -749,10 +736,10 @@ void LLLightState::setPosition(const LLVector4& position)
     ++gGL.mLightHash;
     mPosition = position;
     //transform position by current modelview matrix
-    glh::vec4f pos(position.mV);
-    const glh::matrix4f& mat = gGL.getModelviewMatrix();
-    mat.mult_matrix_vec(pos);
-    mPosition.set(pos.v);
+    glm::vec4 pos(glm::make_vec4(position.mV));
+    const glm::mat4& mat = gGL.getModelviewMatrix();
+    pos = mat * pos;
+    mPosition.set(glm::value_ptr(pos));
 }
 
 void LLLightState::setConstantAttenuation(const F32& atten)
@@ -804,19 +791,18 @@ void LLLightState::setSpotDirection(const LLVector3& direction)
 {
     //always set direction because modelview matrix may have changed
     ++gGL.mLightHash;
-    mSpotDirection = direction;
+
     //transform direction by current modelview matrix
-    glh::vec3f dir(direction.mV);
-    const glh::matrix4f& mat = gGL.getModelviewMatrix();
-    mat.mult_matrix_dir(dir);
+    glm::vec3 dir(glm::make_vec3(direction.mV));
+    const glm::mat3 mat(gGL.getModelviewMatrix());
+    dir = mat * dir;
 
-    mSpotDirection.set(dir.v);
+    mSpotDirection.set(glm::value_ptr(dir));
 }
 
 LLRender::LLRender()
   : mDirty(false),
     mCount(0),
-    mQuadCycle(0),
     mMode(LLRender::TRIANGLES),
     mCurrTextureUnitIndex(0)
 {
@@ -844,6 +830,10 @@ LLRender::LLRender()
 
     for (U32 i = 0; i < NUM_MATRIX_MODES; ++i)
     {
+        for (U32 j = 0; j < LL_MATRIX_STACK_DEPTH; ++j)
+        {
+            mMatrix[i][j] = glm::identity<glm::mat4>();
+        }
         mMatIdx[i] = 0;
         mMatHash[i] = 0;
         mCurMatHash[i] = 0xFFFFFFFF;
@@ -1005,12 +995,12 @@ void LLRender::syncMatrices()
 
     LLGLSLShader* shader = LLGLSLShader::sCurBoundShaderPtr;
 
-    static glh::matrix4f cached_mvp;
-    static glh::matrix4f cached_inv_mdv;
+    static glm::mat4 cached_mvp;
+    static glm::mat4 cached_inv_mdv;
     static U32 cached_mvp_mdv_hash = 0xFFFFFFFF;
     static U32 cached_mvp_proj_hash = 0xFFFFFFFF;
 
-    static glh::matrix4f cached_normal;
+    static glm::mat4 cached_normal;
     static U32 cached_normal_hash = 0xFFFFFFFF;
 
     if (shader)
@@ -1020,15 +1010,15 @@ void LLRender::syncMatrices()
         U32 i = MM_MODELVIEW;
         if (mMatHash[MM_MODELVIEW] != shader->mMatHash[MM_MODELVIEW])
         { //update modelview, normal, and MVP
-            glh::matrix4f& mat = mMatrix[MM_MODELVIEW][mMatIdx[MM_MODELVIEW]];
+            const glm::mat4& mat = mMatrix[MM_MODELVIEW][mMatIdx[MM_MODELVIEW]];
 
             // if MDV has changed, update the cached inverse as well
             if (cached_mvp_mdv_hash != mMatHash[MM_MODELVIEW])
             {
-                cached_inv_mdv = mat.inverse();
+                cached_inv_mdv = glm::inverse(mat);
             }
 
-            shader->uniformMatrix4fv(name[MM_MODELVIEW], 1, GL_FALSE, mat.m);
+            shader->uniformMatrix4fv(name[MM_MODELVIEW], 1, GL_FALSE, glm::value_ptr(mat));
             shader->mMatHash[MM_MODELVIEW] = mMatHash[MM_MODELVIEW];
 
             //update normal matrix
@@ -1037,17 +1027,17 @@ void LLRender::syncMatrices()
             {
                 if (cached_normal_hash != mMatHash[i])
                 {
-                    cached_normal = cached_inv_mdv.transpose();
+                    cached_normal = glm::transpose(cached_inv_mdv);
                     cached_normal_hash = mMatHash[i];
                 }
 
-                glh::matrix4f& norm = cached_normal;
+                auto norm = glm::value_ptr(cached_normal);
 
                 F32 norm_mat[] =
                 {
-                    norm.m[0], norm.m[1], norm.m[2],
-                    norm.m[4], norm.m[5], norm.m[6],
-                    norm.m[8], norm.m[9], norm.m[10]
+                    norm[0], norm[1], norm[2],
+                    norm[4], norm[5], norm[6],
+                    norm[8], norm[9], norm[10]
                 };
 
                 shader->uniformMatrix3fv(LLShaderMgr::NORMAL_MATRIX, 1, GL_FALSE, norm_mat);
@@ -1055,7 +1045,7 @@ void LLRender::syncMatrices()
 
             if (shader->getUniformLocation(LLShaderMgr::INVERSE_MODELVIEW_MATRIX))
             {
-                shader->uniformMatrix4fv(LLShaderMgr::INVERSE_MODELVIEW_MATRIX, 1, GL_FALSE, cached_inv_mdv.m);
+                shader->uniformMatrix4fv(LLShaderMgr::INVERSE_MODELVIEW_MATRIX, 1, GL_FALSE, glm::value_ptr(cached_inv_mdv));
             }
 
             //update MVP matrix
@@ -1068,36 +1058,36 @@ void LLRender::syncMatrices()
                 if (cached_mvp_mdv_hash != mMatHash[i] || cached_mvp_proj_hash != mMatHash[MM_PROJECTION])
                 {
                     cached_mvp = mat;
-                    cached_mvp.mult_left(mMatrix[proj][mMatIdx[proj]]);
+                    cached_mvp = mMatrix[proj][mMatIdx[proj]] * cached_mvp;
                     cached_mvp_mdv_hash = mMatHash[i];
                     cached_mvp_proj_hash = mMatHash[MM_PROJECTION];
                 }
 
-                shader->uniformMatrix4fv(LLShaderMgr::MODELVIEW_PROJECTION_MATRIX, 1, GL_FALSE, cached_mvp.m);
+                shader->uniformMatrix4fv(LLShaderMgr::MODELVIEW_PROJECTION_MATRIX, 1, GL_FALSE, glm::value_ptr(cached_mvp));
             }
         }
 
         i = MM_PROJECTION;
         if (mMatHash[MM_PROJECTION] != shader->mMatHash[MM_PROJECTION])
         { //update projection matrix, normal, and MVP
-            glh::matrix4f& mat = mMatrix[MM_PROJECTION][mMatIdx[MM_PROJECTION]];
+            const glm::mat4& mat = mMatrix[MM_PROJECTION][mMatIdx[MM_PROJECTION]];
 
             // GZ: This was previously disabled seemingly due to a bug involving the deferred renderer's regular pushing and popping of mats.
             // We're reenabling this and cleaning up the code around that - that would've been the appropriate course initially.
             // Anything beyond the standard proj and inv proj mats are special cases.  Please setup special uniforms accordingly in the future.
             if (shader->getUniformLocation(LLShaderMgr::INVERSE_PROJECTION_MATRIX))
             {
-                glh::matrix4f inv_proj = mat.inverse();
-                shader->uniformMatrix4fv(LLShaderMgr::INVERSE_PROJECTION_MATRIX, 1, false, inv_proj.m);
+                glm::mat4 inv_proj = glm::inverse(mat);
+                shader->uniformMatrix4fv(LLShaderMgr::INVERSE_PROJECTION_MATRIX, 1, false, glm::value_ptr(inv_proj));
             }
 
             // Used by some full screen effects - such as full screen lights, glow, etc.
             if (shader->getUniformLocation(LLShaderMgr::IDENTITY_MATRIX))
             {
-                shader->uniformMatrix4fv(LLShaderMgr::IDENTITY_MATRIX, 1, GL_FALSE, glh::matrix4f::identity().m);
+                shader->uniformMatrix4fv(LLShaderMgr::IDENTITY_MATRIX, 1, GL_FALSE, glm::value_ptr(glm::identity<glm::mat4>()));
             }
 
-            shader->uniformMatrix4fv(name[MM_PROJECTION], 1, GL_FALSE, mat.m);
+            shader->uniformMatrix4fv(name[MM_PROJECTION], 1, GL_FALSE, glm::value_ptr(mat));
             shader->mMatHash[MM_PROJECTION] = mMatHash[MM_PROJECTION];
 
             if (!mvp_done)
@@ -1110,12 +1100,12 @@ void LLRender::syncMatrices()
                     {
                         U32 mdv = MM_MODELVIEW;
                         cached_mvp = mat;
-                        cached_mvp.mult_right(mMatrix[mdv][mMatIdx[mdv]]);
+                        cached_mvp *= mMatrix[mdv][mMatIdx[mdv]];
                         cached_mvp_mdv_hash = mMatHash[MM_MODELVIEW];
                         cached_mvp_proj_hash = mMatHash[MM_PROJECTION];
                     }
 
-                    shader->uniformMatrix4fv(LLShaderMgr::MODELVIEW_PROJECTION_MATRIX, 1, GL_FALSE, cached_mvp.m);
+                    shader->uniformMatrix4fv(LLShaderMgr::MODELVIEW_PROJECTION_MATRIX, 1, GL_FALSE, glm::value_ptr(cached_mvp));
                 }
             }
         }
@@ -1124,7 +1114,7 @@ void LLRender::syncMatrices()
         {
             if (mMatHash[i] != shader->mMatHash[i])
             {
-                shader->uniformMatrix4fv(name[i], 1, GL_FALSE, mMatrix[i][mMatIdx[i]].m);
+                shader->uniformMatrix4fv(name[i], 1, GL_FALSE, glm::value_ptr(mMatrix[i][mMatIdx[i]]));
                 shader->mMatHash[i] = mMatHash[i];
             }
         }
@@ -1143,12 +1133,7 @@ void LLRender::translatef(const GLfloat& x, const GLfloat& y, const GLfloat& z)
     flush();
 
     {
-        glh::matrix4f trans_mat(1,0,0,x,
-                                0,1,0,y,
-                                0,0,1,z,
-                                0,0,0,1);
-
-        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]].mult_right(trans_mat);
+        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]] = glm::translate(mMatrix[mMatrixMode][mMatIdx[mMatrixMode]], glm::vec3(x, y, z));
         mMatHash[mMatrixMode]++;
     }
 }
@@ -1158,12 +1143,7 @@ void LLRender::scalef(const GLfloat& x, const GLfloat& y, const GLfloat& z)
     flush();
 
     {
-        glh::matrix4f scale_mat(x,0,0,0,
-                                0,y,0,0,
-                                0,0,z,0,
-                                0,0,0,1);
-
-        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]].mult_right(scale_mat);
+        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]] = glm::scale(mMatrix[mMatrixMode][mMatIdx[mMatrixMode]], glm::vec3(x, y, z));
         mMatHash[mMatrixMode]++;
     }
 }
@@ -1173,13 +1153,7 @@ void LLRender::ortho(F32 left, F32 right, F32 bottom, F32 top, F32 zNear, F32 zF
     flush();
 
     {
-
-        glh::matrix4f ortho_mat(2.f/(right-left),0,0,   -(right+left)/(right-left),
-                                0,2.f/(top-bottom),0,   -(top+bottom)/(top-bottom),
-                                0,0,-2.f/(zFar-zNear),  -(zFar+zNear)/(zFar-zNear),
-                                0,0,0,1);
-
-        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]].mult_right(ortho_mat);
+        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]] *= glm::ortho(left, right, bottom, top, zNear, zFar);
         mMatHash[mMatrixMode]++;
     }
 }
@@ -1189,19 +1163,7 @@ void LLRender::rotatef(const GLfloat& a, const GLfloat& x, const GLfloat& y, con
     flush();
 
     {
-        F32 r = a * DEG_TO_RAD;
-
-        F32 c = cosf(r);
-        F32 s = sinf(r);
-
-        F32 ic = 1.f-c;
-
-        glh::matrix4f rot_mat(x*x*ic+c,     x*y*ic-z*s,     x*z*ic+y*s,     0,
-                              x*y*ic+z*s,   y*y*ic+c,       y*z*ic-x*s,     0,
-                              x*z*ic-y*s,   y*z*ic+x*s,     z*z*ic+c,       0,
-                              0,0,0,1);
-
-        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]].mult_right(rot_mat);
+        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]] = glm::rotate(mMatrix[mMatrixMode][mMatIdx[mMatrixMode]], glm::radians(a), glm::vec3(x,y,z));
         mMatHash[mMatrixMode]++;
     }
 }
@@ -1243,7 +1205,7 @@ void LLRender::loadMatrix(const GLfloat* m)
 {
     flush();
     {
-        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]].set_value((GLfloat*) m);
+        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]] = glm::make_mat4((GLfloat*) m);
         mMatHash[mMatrixMode]++;
     }
 }
@@ -1252,9 +1214,7 @@ void LLRender::multMatrix(const GLfloat* m)
 {
     flush();
     {
-        glh::matrix4f mat((GLfloat*) m);
-
-        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]].mult_right(mat);
+        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]] *= glm::make_mat4(m);
         mMatHash[mMatrixMode]++;
     }
 }
@@ -1297,17 +1257,17 @@ void LLRender::loadIdentity()
     {
         llassert_always(mMatrixMode < NUM_MATRIX_MODES) ;
 
-        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]].make_identity();
+        mMatrix[mMatrixMode][mMatIdx[mMatrixMode]] = glm::identity<glm::mat4>();
         mMatHash[mMatrixMode]++;
     }
 }
 
-const glh::matrix4f& LLRender::getModelviewMatrix()
+const glm::mat4& LLRender::getModelviewMatrix()
 {
     return mMatrix[MM_MODELVIEW][mMatIdx[MM_MODELVIEW]];
 }
 
-const glh::matrix4f& LLRender::getProjectionMatrix()
+const glm::mat4& LLRender::getProjectionMatrix()
 {
     return mMatrix[MM_PROJECTION][mMatIdx[MM_PROJECTION]];
 }
@@ -1338,7 +1298,7 @@ void LLRender::pushUIMatrix()
 {
     if (mUIOffset.empty())
     {
-        mUIOffset.push_back(LLVector3(0,0,0));
+        mUIOffset.emplace_back(0.f,0.f,0.f);
     }
     else
     {
@@ -1347,7 +1307,7 @@ void LLRender::pushUIMatrix()
 
     if (mUIScale.empty())
     {
-        mUIScale.push_back(LLVector3(1,1,1));
+        mUIScale.emplace_back(1.f,1.f,1.f);
     }
     else
     {
@@ -1543,17 +1503,35 @@ void LLRender::clearErrors()
     }
 }
 
+void LLRender::beginList(std::list<LLVertexBufferData> *list)
+{
+    if (sBufferDataList)
+    {
+        LL_ERRS() << "beginList called while another list is open." << LL_ENDL;
+    }
+    llassert(LLGLSLShader::sCurBoundShaderPtr == &gUIProgram);
+    flush();
+    sBufferDataList = list;
+}
+
+void LLRender::endList()
+{
+    if (sBufferDataList)
+    {
+        flush();
+        sBufferDataList = nullptr;
+    }
+    else
+    {
+        llassert(false); // endList called without an open list
+    }
+}
+
 void LLRender::begin(const GLuint& mode)
 {
     if (mode != mMode)
     {
-        if (mode == LLRender::QUADS)
-        {
-            mQuadCycle = 1;
-        }
-
-        if (mMode == LLRender::QUADS ||
-            mMode == LLRender::LINES ||
+        if (mMode == LLRender::LINES ||
             mMode == LLRender::TRIANGLES ||
             mMode == LLRender::POINTS)
         {
@@ -1576,8 +1554,7 @@ void LLRender::end()
         //IMM_ERRS << "GL begin and end called with no vertices specified." << LL_ENDL;
     }
 
-    if ((mMode != LLRender::QUADS &&
-        mMode != LLRender::LINES &&
+    if ((mMode != LLRender::LINES &&
         mMode != LLRender::TRIANGLES &&
         mMode != LLRender::POINTS) ||
         mCount > 2048)
@@ -1585,6 +1562,7 @@ void LLRender::end()
         flush();
     }
 }
+
 void LLRender::flush()
 {
     STOP_GLERROR;
@@ -1601,28 +1579,19 @@ void LLRender::flush()
         //store mCount in a local variable to avoid re-entrance (drawArrays may call flush)
         U32 count = mCount;
 
-            if (mMode == LLRender::QUADS && !sGLCoreProfile)
-            {
-                if (mCount%4 != 0)
-                {
-                count -= (mCount % 4);
-                LL_WARNS() << "Incomplete quad requested." << LL_ENDL;
-                }
-            }
-
-            if (mMode == LLRender::TRIANGLES)
+        if (mMode == LLRender::TRIANGLES)
+        {
+            if (mCount%3 != 0)
             {
-                if (mCount%3 != 0)
-                {
-                count -= (mCount % 3);
-                LL_WARNS() << "Incomplete triangle requested." << LL_ENDL;
-                }
+            count -= (mCount % 3);
+            LL_WARNS() << "Incomplete triangle requested." << LL_ENDL;
             }
+        }
 
-            if (mMode == LLRender::LINES)
+        if (mMode == LLRender::LINES)
+        {
+            if (mCount%2 != 0)
             {
-                if (mCount%2 != 0)
-                {
                 count -= (mCount % 2);
                 LL_WARNS() << "Incomplete line requested." << LL_ENDL;
             }
@@ -1633,125 +1602,155 @@ void LLRender::flush()
         if (mBuffer)
         {
 
-            HBXXH64 hash;
+            LLVertexBuffer *vb;
+
             U32 attribute_mask = LLGLSLShader::sCurBoundShaderPtr->mAttributeMask;
 
+            if (sBufferDataList)
+            {
+                vb = genBuffer(attribute_mask, count);
+                sBufferDataList->emplace_back(
+                    vb,
+                    mMode,
+                    count,
+                    gGL.getTexUnit(0)->mCurrTexture,
+                    mMatrix[MM_MODELVIEW][mMatIdx[MM_MODELVIEW]],
+                    mMatrix[MM_PROJECTION][mMatIdx[MM_PROJECTION]],
+                    mMatrix[MM_TEXTURE0][mMatIdx[MM_TEXTURE0]]
+                    );
+            }
+            else
             {
-                LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("vb cache hash");
+                vb = bufferfromCache(attribute_mask, count);
+            }
 
-                hash.update((U8*)mVerticesp.get(), count * sizeof(LLVector4a));
-                if (attribute_mask & LLVertexBuffer::MAP_TEXCOORD0)
-                {
-                    hash.update((U8*)mTexcoordsp.get(), count * sizeof(LLVector2));
-                }
+            drawBuffer(vb, mMode, count);
+        }
+        else
+        {
+            // mBuffer is present in main thread and not present in an image thread
+            LL_ERRS() << "A flush call from outside main rendering thread" << LL_ENDL;
+        }
 
-                if (attribute_mask & LLVertexBuffer::MAP_COLOR)
-                {
-                    hash.update((U8*)mColorsp.get(), count * sizeof(LLColor4U));
-                }
+        resetStriders(count);
+    }
+}
 
-                hash.finalize();
-            }
+LLVertexBuffer* LLRender::bufferfromCache(U32 attribute_mask, U32 count)
+{
+    LLVertexBuffer *vb = nullptr;
+    HBXXH64 hash;
 
+    {
+        LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("vb cache hash");
 
-            U64 vhash = hash.digest();
+        hash.update((U8*)mVerticesp.get(), count * sizeof(LLVector4a));
+        if (attribute_mask & LLVertexBuffer::MAP_TEXCOORD0)
+        {
+            hash.update((U8*)mTexcoordsp.get(), count * sizeof(LLVector2));
+        }
 
-            // check the VB cache before making a new vertex buffer
-            // This is a giant hack to deal with (mostly) our terrible UI rendering code
-            // that was built on top of OpenGL immediate mode.  Huge performance wins
-            // can be had by not uploading geometry to VRAM unless absolutely necessary.
-            // Most of our usage of the "immediate mode" style draw calls is actually
-            // sending the same geometry over and over again.
-            // To leverage this, we maintain a running hash of the vertex stream being
-            // built up before a flush, and then check that hash against a VB
-            // cache just before creating a vertex buffer in VRAM
-            std::unordered_map<U64, LLVBCache>::iterator cache = sVBCache.find(vhash);
+        if (attribute_mask & LLVertexBuffer::MAP_COLOR)
+        {
+            hash.update((U8*)mColorsp.get(), count * sizeof(LLColor4U));
+        }
 
-            LLPointer<LLVertexBuffer> vb;
+        hash.finalize();
+    }
 
-            if (cache != sVBCache.end())
-            {
-                LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("vb cache hit");
-                // cache hit, just use the cached buffer
-                vb = cache->second.vb;
-                cache->second.touched = std::chrono::steady_clock::now();
-            }
-            else
-            {
-                LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("vb cache miss");
-                vb = new LLVertexBuffer(attribute_mask);
-                vb->allocateBuffer(count, 0);
+    U64 vhash = hash.digest();
+
+    // check the VB cache before making a new vertex buffer
+    // This is a giant hack to deal with (mostly) our terrible UI rendering code
+    // that was built on top of OpenGL immediate mode.  Huge performance wins
+    // can be had by not uploading geometry to VRAM unless absolutely necessary.
+    // Most of our usage of the "immediate mode" style draw calls is actually
+    // sending the same geometry over and over again.
+    // To leverage this, we maintain a running hash of the vertex stream being
+    // built up before a flush, and then check that hash against a VB
+    // cache just before creating a vertex buffer in VRAM
+    std::unordered_map<U64, LLVBCache>::iterator cache = sVBCache.find(vhash);
+
+    if (cache != sVBCache.end())
+    {
+        LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("vb cache hit");
+        // cache hit, just use the cached buffer
+        vb = cache->second.vb;
+        cache->second.touched = std::chrono::steady_clock::now();
+    }
+    else
+    {
+        LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("vb cache miss");
+        vb = genBuffer(attribute_mask, count);
 
-                vb->setBuffer();
+        sVBCache[vhash] = { vb , std::chrono::steady_clock::now() };
 
-                vb->setPositionData((LLVector4a*) mVerticesp.get());
+        static U32 miss_count = 0;
+        miss_count++;
+        if (miss_count > 1024)
+        {
+            LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("vb cache clean");
+            miss_count = 0;
+            auto now = std::chrono::steady_clock::now();
 
-                if (attribute_mask & LLVertexBuffer::MAP_TEXCOORD0)
+            using namespace std::chrono_literals;
+            // every 1024 misses, clean the cache of any VBs that haven't been touched in the last second
+            for (std::unordered_map<U64, LLVBCache>::iterator iter = sVBCache.begin(); iter != sVBCache.end(); )
+            {
+                if (now - iter->second.touched > 1s)
                 {
-                    vb->setTexCoord0Data(mTexcoordsp.get());
+                    iter = sVBCache.erase(iter);
                 }
-
-                if (attribute_mask & LLVertexBuffer::MAP_COLOR)
+                else
                 {
-                    vb->setColorData(mColorsp.get());
+                    ++iter;
                 }
+            }
+        }
+    }
+    return vb;
+}
 
-#if LL_DARWIN
-                vb->unmapBuffer();
-#endif
-                vb->unbind();
+LLVertexBuffer* LLRender::genBuffer(U32 attribute_mask, S32 count)
+{
+    LLVertexBuffer * vb = new LLVertexBuffer(attribute_mask);
+    vb->allocateBuffer(count, 0);
 
-                sVBCache[vhash] = { vb , std::chrono::steady_clock::now() };
+    vb->setBuffer();
 
-                static U32 miss_count = 0;
-                miss_count++;
-                if (miss_count > 1024)
-                {
-                    LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("vb cache clean");
-                    miss_count = 0;
-                    auto now = std::chrono::steady_clock::now();
+    vb->setPositionData(mVerticesp.get());
 
-                    using namespace std::chrono_literals;
-                    // every 1024 misses, clean the cache of any VBs that haven't been touched in the last second
-                    for (std::unordered_map<U64, LLVBCache>::iterator iter = sVBCache.begin(); iter != sVBCache.end(); )
-                    {
-                        if (now - iter->second.touched > 1s)
-                        {
-                            iter = sVBCache.erase(iter);
-                        }
-                        else
-                        {
-                            ++iter;
-                        }
-                    }
-                }
-            }
+    if (attribute_mask & LLVertexBuffer::MAP_TEXCOORD0)
+    {
+        vb->setTexCoord0Data(mTexcoordsp.get());
+    }
 
-            vb->setBuffer();
+    if (attribute_mask & LLVertexBuffer::MAP_COLOR)
+    {
+        vb->setColorData(mColorsp.get());
+    }
 
-            if (mMode == LLRender::QUADS && sGLCoreProfile)
-            {
-                vb->drawArrays(LLRender::TRIANGLES, 0, count);
-                mQuadCycle = 1;
-            }
-            else
-            {
-                vb->drawArrays(mMode, 0, count);
-            }
-        }
-        else
-        {
-            // mBuffer is present in main thread and not present in an image thread
-            LL_ERRS() << "A flush call from outside main rendering thread" << LL_ENDL;
-        }
+#if LL_DARWIN
+    vb->unmapBuffer();
+#endif
+    vb->unbind();
 
+    return vb;
+}
 
-        mVerticesp[0] = mVerticesp[count];
-        mTexcoordsp[0] = mTexcoordsp[count];
-        mColorsp[0] = mColorsp[count];
+void LLRender::drawBuffer(LLVertexBuffer* vb, U32 mode, S32 count)
+{
+    vb->setBuffer();
+    vb->drawArrays(mode, 0, count);
+}
 
-        mCount = 0;
-    }
+void LLRender::resetStriders(S32 count)
+{
+    mVerticesp[0] = mVerticesp[count];
+    mTexcoordsp[0] = mTexcoordsp[count];
+    mColorsp[0] = mColorsp[count];
+
+    mCount = 0;
 }
 
 void LLRender::vertex3f(const GLfloat& x, const GLfloat& y, const GLfloat& z)
@@ -1763,7 +1762,6 @@ void LLRender::vertex3f(const GLfloat& x, const GLfloat& y, const GLfloat& z)
         {
             case LLRender::POINTS: flush(); break;
             case LLRender::TRIANGLES: if (mCount%3==0) flush(); break;
-            case LLRender::QUADS: if(mCount%4 == 0) flush(); break;
             case LLRender::LINES: if (mCount%2 == 0) flush(); break;
         }
     }
@@ -1776,31 +1774,12 @@ void LLRender::vertex3f(const GLfloat& x, const GLfloat& y, const GLfloat& z)
 
     if (mUIOffset.empty())
     {
-        mVerticesp[mCount] = LLVector3(x,y,z);
+        mVerticesp[mCount].set(x,y,z);
     }
     else
     {
         LLVector3 vert = (LLVector3(x,y,z)+mUIOffset.back()).scaledVec(mUIScale.back());
-        mVerticesp[mCount] = vert;
-    }
-
-    if (mMode == LLRender::QUADS && LLRender::sGLCoreProfile)
-    {
-        mQuadCycle++;
-        if (mQuadCycle == 4)
-        { //copy two vertices so fourth quad element will add a triangle
-            mQuadCycle = 0;
-
-            mCount++;
-            mVerticesp[mCount] = mVerticesp[mCount-3];
-            mColorsp[mCount] = mColorsp[mCount-3];
-            mTexcoordsp[mCount] = mTexcoordsp[mCount-3];
-
-            mCount++;
-            mVerticesp[mCount] = mVerticesp[mCount-2];
-            mColorsp[mCount] = mColorsp[mCount-2];
-            mTexcoordsp[mCount] = mTexcoordsp[mCount-2];
-        }
+        mVerticesp[mCount].set(vert.mV[VX], vert.mV[VY], vert.mV[VZ]);
     }
 
     mCount++;
@@ -1809,7 +1788,7 @@ void LLRender::vertex3f(const GLfloat& x, const GLfloat& y, const GLfloat& z)
     mTexcoordsp[mCount] = mTexcoordsp[mCount-1];
 }
 
-void LLRender::vertexBatchPreTransformed(LLVector3* verts, S32 vert_count)
+void LLRender::vertexBatchPreTransformed(LLVector4a* verts, S32 vert_count)
 {
     if (mCount + vert_count > 4094)
     {
@@ -1817,57 +1796,20 @@ void LLRender::vertexBatchPreTransformed(LLVector3* verts, S32 vert_count)
         return;
     }
 
-    if (sGLCoreProfile && mMode == LLRender::QUADS)
-    { //quads are deprecated, convert to triangle list
-        S32 i = 0;
-
-        while (i < vert_count)
-        {
-            //read first three
-            mVerticesp[mCount++] = verts[i++];
-            mTexcoordsp[mCount] = mTexcoordsp[mCount-1];
-            mColorsp[mCount] = mColorsp[mCount-1];
-
-            mVerticesp[mCount++] = verts[i++];
-            mTexcoordsp[mCount] = mTexcoordsp[mCount-1];
-            mColorsp[mCount] = mColorsp[mCount-1];
-
-            mVerticesp[mCount++] = verts[i++];
-            mTexcoordsp[mCount] = mTexcoordsp[mCount-1];
-            mColorsp[mCount] = mColorsp[mCount-1];
-
-            //copy two
-            mVerticesp[mCount++] = verts[i-3];
-            mTexcoordsp[mCount] = mTexcoordsp[mCount-1];
-            mColorsp[mCount] = mColorsp[mCount-1];
-
-            mVerticesp[mCount++] = verts[i-1];
-            mTexcoordsp[mCount] = mTexcoordsp[mCount-1];
-            mColorsp[mCount] = mColorsp[mCount-1];
-
-            //copy last one
-            mVerticesp[mCount++] = verts[i++];
-            mTexcoordsp[mCount] = mTexcoordsp[mCount-1];
-            mColorsp[mCount] = mColorsp[mCount-1];
-        }
-    }
-    else
+    for (S32 i = 0; i < vert_count; i++)
     {
-        for (S32 i = 0; i < vert_count; i++)
-        {
-            mVerticesp[mCount] = verts[i];
+        mVerticesp[mCount] = verts[i];
 
-            mCount++;
-            mTexcoordsp[mCount] = mTexcoordsp[mCount-1];
-            mColorsp[mCount] = mColorsp[mCount-1];
-        }
+        mCount++;
+        mTexcoordsp[mCount] = mTexcoordsp[mCount-1];
+        mColorsp[mCount] = mColorsp[mCount-1];
     }
 
     if( mCount > 0 ) // ND: Guard against crashes if mCount is zero, yes it can happen
         mVerticesp[mCount] = mVerticesp[mCount-1];
 }
 
-void LLRender::vertexBatchPreTransformed(LLVector3* verts, LLVector2* uvs, S32 vert_count)
+void LLRender::vertexBatchPreTransformed(LLVector4a* verts, LLVector2* uvs, S32 vert_count)
 {
     if (mCount + vert_count > 4094)
     {
@@ -1875,50 +1817,13 @@ void LLRender::vertexBatchPreTransformed(LLVector3* verts, LLVector2* uvs, S32 v
         return;
     }
 
-    if (sGLCoreProfile && mMode == LLRender::QUADS)
-    { //quads are deprecated, convert to triangle list
-        S32 i = 0;
-
-        while (i < vert_count)
-        {
-            //read first three
-            mVerticesp[mCount] = verts[i];
-            mTexcoordsp[mCount++] = uvs[i++];
-            mColorsp[mCount] = mColorsp[mCount-1];
-
-            mVerticesp[mCount] = verts[i];
-            mTexcoordsp[mCount++] = uvs[i++];
-            mColorsp[mCount] = mColorsp[mCount-1];
-
-            mVerticesp[mCount] = verts[i];
-            mTexcoordsp[mCount++] = uvs[i++];
-            mColorsp[mCount] = mColorsp[mCount-1];
-
-            //copy last two
-            mVerticesp[mCount] = verts[i-3];
-            mTexcoordsp[mCount++] = uvs[i-3];
-            mColorsp[mCount] = mColorsp[mCount-1];
-
-            mVerticesp[mCount] = verts[i-1];
-            mTexcoordsp[mCount++] = uvs[i-1];
-            mColorsp[mCount] = mColorsp[mCount-1];
-
-            //copy last one
-            mVerticesp[mCount] = verts[i];
-            mTexcoordsp[mCount++] = uvs[i++];
-            mColorsp[mCount] = mColorsp[mCount-1];
-        }
-    }
-    else
+    for (S32 i = 0; i < vert_count; i++)
     {
-        for (S32 i = 0; i < vert_count; i++)
-        {
-            mVerticesp[mCount] = verts[i];
-            mTexcoordsp[mCount] = uvs[i];
+        mVerticesp[mCount] = verts[i];
+        mTexcoordsp[mCount] = uvs[i];
 
-            mCount++;
-            mColorsp[mCount] = mColorsp[mCount-1];
-        }
+        mCount++;
+        mColorsp[mCount] = mColorsp[mCount-1];
     }
 
     if (mCount > 0)
@@ -1928,7 +1833,7 @@ void LLRender::vertexBatchPreTransformed(LLVector3* verts, LLVector2* uvs, S32 v
     }
 }
 
-void LLRender::vertexBatchPreTransformed(LLVector3* verts, LLVector2* uvs, LLColor4U* colors, S32 vert_count)
+void LLRender::vertexBatchPreTransformed(LLVector4a* verts, LLVector2* uvs, LLColor4U* colors, S32 vert_count)
 {
     if (mCount + vert_count > 4094)
     {
@@ -1936,51 +1841,13 @@ void LLRender::vertexBatchPreTransformed(LLVector3* verts, LLVector2* uvs, LLCol
         return;
     }
 
-
-    if (sGLCoreProfile && mMode == LLRender::QUADS)
-    { //quads are deprecated, convert to triangle list
-        S32 i = 0;
-
-        while (i < vert_count)
-        {
-            //read first three
-            mVerticesp[mCount] = verts[i];
-            mTexcoordsp[mCount] = uvs[i];
-            mColorsp[mCount++] = colors[i++];
-
-            mVerticesp[mCount] = verts[i];
-            mTexcoordsp[mCount] = uvs[i];
-            mColorsp[mCount++] = colors[i++];
-
-            mVerticesp[mCount] = verts[i];
-            mTexcoordsp[mCount] = uvs[i];
-            mColorsp[mCount++] = colors[i++];
-
-            //copy last two
-            mVerticesp[mCount] = verts[i-3];
-            mTexcoordsp[mCount] = uvs[i-3];
-            mColorsp[mCount++] = colors[i-3];
-
-            mVerticesp[mCount] = verts[i-1];
-            mTexcoordsp[mCount] = uvs[i-1];
-            mColorsp[mCount++] = colors[i-1];
-
-            //copy last one
-            mVerticesp[mCount] = verts[i];
-            mTexcoordsp[mCount] = uvs[i];
-            mColorsp[mCount++] = colors[i++];
-        }
-    }
-    else
+    for (S32 i = 0; i < vert_count; i++)
     {
-        for (S32 i = 0; i < vert_count; i++)
-        {
-            mVerticesp[mCount] = verts[i];
-            mTexcoordsp[mCount] = uvs[i];
-            mColorsp[mCount] = colors[i];
+        mVerticesp[mCount] = verts[i];
+        mTexcoordsp[mCount] = uvs[i];
+        mColorsp[mCount] = colors[i];
 
-            mCount++;
-        }
+        mCount++;
     }
 
     if (mCount > 0)
@@ -2164,85 +2031,90 @@ void LLRender::debugTexUnits(void)
     LL_INFOS("TextureUnit") << "Active TexUnit Enabled : " << active_enabled << LL_ENDL;
 }
 
-
-
-glh::matrix4f copy_matrix(F32* src)
+glm::mat4 get_current_modelview()
 {
-    glh::matrix4f ret;
-    ret.set_value(src);
-    return ret;
+    return glm::make_mat4(gGLModelView);
 }
 
-glh::matrix4f get_current_modelview()
+glm::mat4 get_current_projection()
 {
-    return copy_matrix(gGLModelView);
+    return glm::make_mat4(gGLProjection);
 }
 
-glh::matrix4f get_current_projection()
+glm::mat4 get_last_modelview()
 {
-    return copy_matrix(gGLProjection);
+    return glm::make_mat4(gGLLastModelView);
 }
 
-glh::matrix4f get_last_modelview()
+glm::mat4 get_last_projection()
 {
-    return copy_matrix(gGLLastModelView);
+    return glm::make_mat4(gGLLastProjection);
 }
 
-glh::matrix4f get_last_projection()
-{
-    return copy_matrix(gGLLastProjection);
-}
-
-void copy_matrix(const glh::matrix4f& src, F32* dst)
+void copy_matrix(const glm::mat4& src, F32* dst)
 {
+    auto matp = glm::value_ptr(src);
     for (U32 i = 0; i < 16; i++)
     {
-        dst[i] = src.m[i];
+        dst[i] = matp[i];
     }
 }
 
-void set_current_modelview(const glh::matrix4f& mat)
+void set_current_modelview(const glm::mat4& mat)
 {
     copy_matrix(mat, gGLModelView);
 }
 
-void set_current_projection(glh::matrix4f& mat)
+void set_current_projection(const glm::mat4& mat)
 {
     copy_matrix(mat, gGLProjection);
 }
 
-glh::matrix4f gl_ortho(GLfloat left, GLfloat right, GLfloat bottom, GLfloat top, GLfloat znear, GLfloat zfar)
+void set_last_modelview(const glm::mat4& mat)
 {
-    glh::matrix4f ret(
-        2.f/(right-left), 0.f, 0.f, -(right+left)/(right-left),
-        0.f, 2.f/(top-bottom), 0.f, -(top+bottom)/(top-bottom),
-        0.f, 0.f, -2.f/(zfar-znear),  -(zfar+znear)/(zfar-znear),
-        0.f, 0.f, 0.f, 1.f);
-
-    return ret;
+    copy_matrix(mat, gGLLastModelView);
 }
 
-glh::matrix4f gl_perspective(GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar)
+void set_last_projection(const glm::mat4& mat)
 {
-    GLfloat f = 1.f/tanf(DEG_TO_RAD*fovy/2.f);
-
-    return glh::matrix4f(f/aspect, 0, 0, 0,
-                         0, f, 0, 0,
-                         0, 0, (zFar+zNear)/(zNear-zFar), (2.f*zFar*zNear)/(zNear-zFar),
-                         0, 0, -1.f, 0);
+    copy_matrix(mat, gGLLastProjection);
 }
 
-glh::matrix4f gl_lookat(LLVector3 eye, LLVector3 center, LLVector3 up)
+glm::vec3 mul_mat4_vec3(const glm::mat4& mat, const glm::vec3& vec)
 {
-    LLVector3 f = center-eye;
-    f.normVec();
-    up.normVec();
-    LLVector3 s = f % up;
-    LLVector3 u = s % f;
+    //const float w = vec[0] * mat[0][3] + vec[1] * mat[1][3] + vec[2] * mat[2][3] + mat[3][3];
+    //return glm::vec3(
+    //    (vec[0] * mat[0][0] + vec[1] * mat[1][0] + vec[2] * mat[2][0] + mat[3][0]) / w,
+    //    (vec[0] * mat[0][1] + vec[1] * mat[1][1] + vec[2] * mat[2][1] + mat[3][1]) / w,
+    //    (vec[0] * mat[0][2] + vec[1] * mat[1][2] + vec[2] * mat[2][2] + mat[3][2]) / w
+    //);
+    LLVector4a x, y, z, s, t, p, q;
+
+    x.splat(vec.x);
+    y.splat(vec.y);
+    z.splat(vec.z);
+
+    s.splat<3>(mat[0].data);
+    t.splat<3>(mat[1].data);
+    p.splat<3>(mat[2].data);
+    q.splat<3>(mat[3].data);
+
+    s.mul(x);
+    t.mul(y);
+    p.mul(z);
+    q.add(s);
+    t.add(p);
+    q.add(t);
 
-    return glh::matrix4f(s[0], s[1], s[2], 0,
-                      u[0], u[1], u[2], 0,
-                      -f[0], -f[1], -f[2], 0,
-                      0, 0, 0, 1);
+    x.mul(mat[0].data);
+    y.mul(mat[1].data);
+    z.mul(mat[2].data);
 
+    x.add(y);
+    z.add(mat[3].data);
+    LLVector4a res;
+    res.load3(glm::value_ptr(vec));
+    res.setAdd(x, z);
+    res.div(q);
+    return glm::make_vec3(res.getF32ptr());
 }
diff --git a/indra/llrender/llrender.h b/indra/llrender/llrender.h
index 010ab122b6..fc7c5ccc18 100644
--- a/indra/llrender/llrender.h
+++ b/indra/llrender/llrender.h
@@ -42,15 +42,17 @@
 #include "llpointer.h"
 #include "llglheaders.h"
 #include "llmatrix4a.h"
-#include "glh/glh_linear.h"
+#include "glm/mat4x4.hpp"
 
 #include <array>
+#include <list>
 
 class LLVertexBuffer;
 class LLCubeMap;
 class LLImageGL;
 class LLRenderTarget;
-class LLTexture ;
+class LLTexture;
+class LLVertexBufferData;
 
 #define LL_MATRIX_STACK_DEPTH 32
 
@@ -219,17 +221,12 @@ public:
 
     void setHasMipMaps(bool hasMips) { mHasMipMaps = hasMips; }
 
-    void setTextureColorSpace(eTextureColorSpace space);
-
-    eTextureColorSpace getCurrColorSpace() { return mTexColorSpace; }
-
 protected:
     friend class LLRender;
 
     S32                 mIndex;
     U32                 mCurrTexture;
     eTextureType        mCurrTexType;
-    eTextureColorSpace  mTexColorSpace;
     S32                 mCurrColorScale;
     S32                 mCurrAlphaScale;
     bool                mHasMipMaps;
@@ -322,7 +319,6 @@ public:
         POINTS,
         LINES,
         LINE_STRIP,
-        QUADS,
         LINE_LOOP,
         NUM_MODES
     };
@@ -404,8 +400,8 @@ public:
     void matrixMode(eMatrixMode mode);
     eMatrixMode getMatrixMode();
 
-    const glh::matrix4f& getModelviewMatrix();
-    const glh::matrix4f& getProjectionMatrix();
+    const glm::mat4& getModelviewMatrix();
+    const glm::mat4& getProjectionMatrix();
 
     void syncMatrices();
     void syncLightState();
@@ -420,8 +416,15 @@ public:
 
     void flush();
 
+    // if list is set, will store buffers in list for later use, if list isn't set, will use cache
+    void beginList(std::list<LLVertexBufferData> *list);
+    void endList();
+
     void begin(const GLuint& mode);
     void end();
+
+    U8 getMode() const { return mMode; }
+
     void vertex2i(const GLint& x, const GLint& y);
     void vertex2f(const GLfloat& x, const GLfloat& y);
     void vertex3f(const GLfloat& x, const GLfloat& y, const GLfloat& z);
@@ -446,9 +449,9 @@ public:
     void diffuseColor4ubv(const U8* c);
     void diffuseColor4ub(U8 r, U8 g, U8 b, U8 a);
 
-    void vertexBatchPreTransformed(LLVector3* verts, S32 vert_count);
-    void vertexBatchPreTransformed(LLVector3* verts, LLVector2* uvs, S32 vert_count);
-    void vertexBatchPreTransformed(LLVector3* verts, LLVector2* uvs, LLColor4U*, S32 vert_count);
+    void vertexBatchPreTransformed(LLVector4a* verts, S32 vert_count);
+    void vertexBatchPreTransformed(LLVector4a* verts, LLVector2* uvs, S32 vert_count);
+    void vertexBatchPreTransformed(LLVector4a* verts, LLVector2* uvs, LLColor4U*, S32 vert_count);
 
     void setColorMask(bool writeColor, bool writeAlpha);
     void setColorMask(bool writeColorR, bool writeColorG, bool writeColorB, bool writeAlpha);
@@ -490,23 +493,27 @@ public:
 private:
     friend class LLLightState;
 
+    LLVertexBuffer* bufferfromCache(U32 attribute_mask, U32 count);
+    LLVertexBuffer* genBuffer(U32 attribute_mask, S32 count);
+    void drawBuffer(LLVertexBuffer* vb, U32 mode, S32 count);
+    void resetStriders(S32 count);
+
     eMatrixMode mMatrixMode;
     U32 mMatIdx[NUM_MATRIX_MODES];
     U32 mMatHash[NUM_MATRIX_MODES];
-    glh::matrix4f mMatrix[NUM_MATRIX_MODES][LL_MATRIX_STACK_DEPTH];
+    glm::mat4 mMatrix[NUM_MATRIX_MODES][LL_MATRIX_STACK_DEPTH];
     U32 mCurMatHash[NUM_MATRIX_MODES];
     U32 mLightHash;
     LLColor4 mAmbientLightColor;
 
     bool            mDirty;
-    U32             mQuadCycle;
     U32             mCount;
     U32             mMode;
     U32             mCurrTextureUnitIndex;
     bool                mCurrColorMask[4];
 
     LLPointer<LLVertexBuffer>   mBuffer;
-    LLStrider<LLVector3>        mVerticesp;
+    LLStrider<LLVector4a>       mVerticesp;
     LLStrider<LLVector2>        mTexcoordsp;
     LLStrider<LLColor4U>        mColorsp;
     std::array<LLTexUnit, LL_NUM_TEXTURE_LAYERS> mTexUnits;
@@ -520,7 +527,6 @@ private:
 
     std::vector<LLVector3> mUIOffset;
     std::vector<LLVector3> mUIScale;
-
 };
 
 extern F32 gGLModelView[16];
@@ -528,8 +534,8 @@ extern F32 gGLLastModelView[16];
 extern F32 gGLLastProjection[16];
 extern F32 gGLProjection[16];
 extern S32 gGLViewport[4];
-extern F32 gGLDeltaModelView[16];
-extern F32 gGLInverseDeltaModelView[16];
+extern glm::mat4 gGLDeltaModelView;
+extern glm::mat4 gGLInverseDeltaModelView;
 
 extern thread_local LLRender gGL;
 
@@ -540,19 +546,20 @@ const F32 OGL_TO_CFR_ROTATION[16] = {  0.f,  0.f, -1.f,  0.f,   // -Z becomes X
                                        0.f,  1.f,  0.f,  0.f,   //  Y becomes Z
                                        0.f,  0.f,  0.f,  1.f };
 
-glh::matrix4f copy_matrix(F32* src);
-glh::matrix4f get_current_modelview();
-glh::matrix4f get_current_projection();
-glh::matrix4f get_last_modelview();
-glh::matrix4f get_last_projection();
+glm::mat4 copy_matrix(F32* src);
+glm::mat4 get_current_modelview();
+glm::mat4 get_current_projection();
+glm::mat4 get_last_modelview();
+glm::mat4 get_last_projection();
 
-void copy_matrix(const glh::matrix4f& src, F32* dst);
-void set_current_modelview(const glh::matrix4f& mat);
-void set_current_projection(glh::matrix4f& mat);
+void copy_matrix(const glm::mat4& src, F32* dst);
+void set_current_modelview(const glm::mat4& mat);
+void set_current_projection(const glm::mat4& mat);
+void set_last_modelview(const glm::mat4& mat);
+void set_last_projection(const glm::mat4& mat);
 
-glh::matrix4f gl_ortho(GLfloat left, GLfloat right, GLfloat bottom, GLfloat top, GLfloat znear, GLfloat zfar);
-glh::matrix4f gl_perspective(GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar);
-glh::matrix4f gl_lookat(LLVector3 eye, LLVector3 center, LLVector3 up);
+// glh compat
+glm::vec3 mul_mat4_vec3(const glm::mat4& mat, const glm::vec3& vec);
 
 #define LL_SHADER_LOADING_WARNS(...) LL_WARNS()
 
diff --git a/indra/llrender/llrender2dutils.cpp b/indra/llrender/llrender2dutils.cpp
index 428370057e..5b08c29d64 100644
--- a/indra/llrender/llrender2dutils.cpp
+++ b/indra/llrender/llrender2dutils.cpp
@@ -122,10 +122,13 @@ void gl_rect_2d(S32 left, S32 top, S32 right, S32 bottom, bool filled )
     // Counterclockwise quad will face the viewer
     if( filled )
     {
-        gGL.begin( LLRender::QUADS );
+        gGL.begin( LLRender::TRIANGLES );
             gGL.vertex2i(left, top);
             gGL.vertex2i(left, bottom);
             gGL.vertex2i(right, bottom);
+
+            gGL.vertex2i(left, top);
+            gGL.vertex2i(right, bottom);
             gGL.vertex2i(right, top);
         gGL.end();
     }
@@ -172,50 +175,70 @@ void gl_drop_shadow(S32 left, S32 top, S32 right, S32 bottom, const LLColor4 &st
     LLColor4 end_color = start_color;
     end_color.mV[VALPHA] = 0.f;
 
-    gGL.begin(LLRender::QUADS);
+    gGL.begin(LLRender::TRIANGLES);
 
     // Right edge, CCW faces screen
     gGL.color4fv(start_color.mV);
-    gGL.vertex2i(right,     top-lines);
-    gGL.vertex2i(right,     bottom);
+    gGL.vertex2i(right, top - lines);
+    gGL.vertex2i(right, bottom);
+    gGL.color4fv(end_color.mV);
+    gGL.vertex2i(right + lines, bottom);
+    gGL.color4fv(start_color.mV);
+    gGL.vertex2i(right, top - lines);
     gGL.color4fv(end_color.mV);
-    gGL.vertex2i(right+lines, bottom);
-    gGL.vertex2i(right+lines, top-lines);
+    gGL.vertex2i(right + lines, bottom);
+    gGL.vertex2i(right + lines, top - lines);
 
     // Bottom edge, CCW faces screen
     gGL.color4fv(start_color.mV);
-    gGL.vertex2i(right,     bottom);
-    gGL.vertex2i(left+lines,    bottom);
+    gGL.vertex2i(right, bottom);
+    gGL.vertex2i(left + lines, bottom);
+    gGL.color4fv(end_color.mV);
+    gGL.vertex2i(left + lines, bottom - lines);
+    gGL.color4fv(start_color.mV);
+    gGL.vertex2i(right, bottom);
     gGL.color4fv(end_color.mV);
-    gGL.vertex2i(left+lines,    bottom-lines);
-    gGL.vertex2i(right,     bottom-lines);
+    gGL.vertex2i(left + lines, bottom - lines);
+    gGL.vertex2i(right, bottom - lines);
 
     // bottom left Corner
     gGL.color4fv(start_color.mV);
-    gGL.vertex2i(left+lines,    bottom);
+    gGL.vertex2i(left + lines, bottom);
     gGL.color4fv(end_color.mV);
-    gGL.vertex2i(left,      bottom);
+    gGL.vertex2i(left, bottom);
     // make the bottom left corner not sharp
-    gGL.vertex2i(left+1,        bottom-lines+1);
-    gGL.vertex2i(left+lines,    bottom-lines);
+    gGL.vertex2i(left + 1, bottom - lines + 1);
+    gGL.color4fv(start_color.mV);
+    gGL.vertex2i(left + lines, bottom);
+    gGL.color4fv(end_color.mV);
+    gGL.vertex2i(left + 1, bottom - lines + 1);
+    gGL.vertex2i(left + lines, bottom - lines);
 
     // bottom right corner
     gGL.color4fv(start_color.mV);
-    gGL.vertex2i(right,     bottom);
+    gGL.vertex2i(right, bottom);
     gGL.color4fv(end_color.mV);
-    gGL.vertex2i(right,     bottom-lines);
+    gGL.vertex2i(right, bottom - lines);
     // make the rightmost corner not sharp
-    gGL.vertex2i(right+lines-1, bottom-lines+1);
-    gGL.vertex2i(right+lines,   bottom);
+    gGL.vertex2i(right + lines - 1, bottom - lines + 1);
+    gGL.color4fv(start_color.mV);
+    gGL.vertex2i(right, bottom);
+    gGL.color4fv(end_color.mV);
+    gGL.vertex2i(right + lines - 1, bottom - lines + 1);
+    gGL.vertex2i(right + lines, bottom);
 
     // top right corner
     gGL.color4fv(start_color.mV);
-    gGL.vertex2i( right,            top-lines );
+    gGL.vertex2i(right, top - lines);
     gGL.color4fv(end_color.mV);
-    gGL.vertex2i( right+lines,  top-lines );
+    gGL.vertex2i(right + lines, top - lines);
     // make the corner not sharp
-    gGL.vertex2i( right+lines-1,    top-1 );
-    gGL.vertex2i( right,            top );
+    gGL.vertex2i(right + lines - 1, top - 1);
+    gGL.color4fv(start_color.mV);
+    gGL.vertex2i(right, top - lines);
+    gGL.color4fv(end_color.mV);
+    gGL.vertex2i(right + lines - 1, top - 1);
+    gGL.vertex2i(right, top);
 
     gGL.end();
     stop_glerror();
@@ -423,171 +446,251 @@ void gl_draw_scaled_image_with_border(S32 x, S32 y, S32 width, S32 height, LLTex
                                 ui_translation.mV[VX] + width * ui_scale.mV[VX],
                                 ui_translation.mV[VY]);
 
-        LLGLSUIDefault gls_ui;
-
         gGL.getTexUnit(0)->bind(image, true);
 
         gGL.color4fv(color.mV);
 
-        const S32 NUM_VERTICES = 9 * 4; // 9 quads
-        LLVector2 uv[NUM_VERTICES];
-        LLVector3 pos[NUM_VERTICES];
+        constexpr S32 NUM_VERTICES = 9 * 2 * 3; // 9 quads, 2 triangles per quad, 3 vertices per triangle
+        static thread_local LLVector2 uv[NUM_VERTICES];
+        static thread_local LLVector4a pos[NUM_VERTICES];
 
         S32 index = 0;
 
-        gGL.begin(LLRender::QUADS);
+        gGL.begin(LLRender::TRIANGLES);
         {
-            // draw bottom left
-            uv[index] = LLVector2(uv_outer_rect.mLeft, uv_outer_rect.mBottom);
-            pos[index] = LLVector3(draw_outer_rect.mLeft, draw_outer_rect.mBottom, 0.f);
+            // draw bottom left triangles
+            // 1
+            uv[index].set(uv_outer_rect.mLeft, uv_outer_rect.mBottom);
+            pos[index].set(draw_outer_rect.mLeft, draw_outer_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_outer_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_outer_rect.mBottom, 0.f);
+            uv[index].set(uv_center_rect.mLeft, uv_outer_rect.mBottom);
+            pos[index].set(draw_center_rect.mLeft, draw_outer_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_center_rect.mBottom, 0.f);
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_outer_rect.mLeft, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_outer_rect.mLeft, draw_center_rect.mBottom, 0.f);
+            // 2
+            uv[index].set(uv_outer_rect.mLeft, uv_outer_rect.mBottom);
+            pos[index].set(draw_outer_rect.mLeft, draw_outer_rect.mBottom, 0.f);
             index++;
 
-            // draw bottom middle
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_outer_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_outer_rect.mBottom, 0.f);
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_outer_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_outer_rect.mBottom, 0.f);
+            uv[index].set(uv_outer_rect.mLeft, uv_center_rect.mBottom);
+            pos[index].set(draw_outer_rect.mLeft, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_center_rect.mBottom, 0.f);
+            // draw bottom middle triangles
+            uv[index].set(uv_center_rect.mLeft, uv_outer_rect.mBottom);
+            pos[index].set(draw_center_rect.mLeft, draw_outer_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_center_rect.mBottom, 0.f);
+            uv[index].set(uv_center_rect.mRight, uv_outer_rect.mBottom);
+            pos[index].set(draw_center_rect.mRight, draw_outer_rect.mBottom, 0.f);
             index++;
 
-            // draw bottom right
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_outer_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_outer_rect.mBottom, 0.f);
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_outer_rect.mRight, uv_outer_rect.mBottom);
-            pos[index] = LLVector3(draw_outer_rect.mRight, draw_outer_rect.mBottom, 0.f);
+            // 2
+            uv[index].set(uv_center_rect.mLeft, uv_outer_rect.mBottom);
+            pos[index].set(draw_center_rect.mLeft, draw_outer_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_outer_rect.mRight, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_outer_rect.mRight, draw_center_rect.mBottom, 0.f);
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_center_rect.mBottom, 0.f);
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mBottom, 0.f);
             index++;
 
-            // draw left
-            uv[index] = LLVector2(uv_outer_rect.mLeft, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_outer_rect.mLeft, draw_center_rect.mBottom, 0.f);
+            // draw bottom right triangles
+            uv[index].set(uv_center_rect.mRight, uv_outer_rect.mBottom);
+            pos[index].set(draw_center_rect.mRight, draw_outer_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_center_rect.mBottom, 0.f);
+            uv[index].set(uv_outer_rect.mRight, uv_outer_rect.mBottom);
+            pos[index].set(draw_outer_rect.mRight, draw_outer_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_center_rect.mTop, 0.f);
+            uv[index].set(uv_outer_rect.mRight, uv_center_rect.mBottom);
+            pos[index].set(draw_outer_rect.mRight, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_outer_rect.mLeft, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_outer_rect.mLeft, draw_center_rect.mTop, 0.f);
+            // 2
+            uv[index].set(uv_center_rect.mRight, uv_outer_rect.mBottom);
+            pos[index].set(draw_center_rect.mRight, draw_outer_rect.mBottom, 0.f);
             index++;
 
-            // draw middle
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_center_rect.mBottom, 0.f);
+            uv[index].set(uv_outer_rect.mRight, uv_center_rect.mBottom);
+            pos[index].set(draw_outer_rect.mRight, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_center_rect.mBottom, 0.f);
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_center_rect.mTop, 0.f);
+            // draw left triangles
+            uv[index].set(uv_outer_rect.mLeft, uv_center_rect.mBottom);
+            pos[index].set(draw_outer_rect.mLeft, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_center_rect.mTop, 0.f);
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mBottom, 0.f);
             index++;
 
-            // draw right
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_center_rect.mBottom, 0.f);
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mTop, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_outer_rect.mRight, uv_center_rect.mBottom);
-            pos[index] = LLVector3(draw_outer_rect.mRight, draw_center_rect.mBottom, 0.f);
+            // 2
+            uv[index].set(uv_outer_rect.mLeft, uv_center_rect.mBottom);
+            pos[index].set(draw_outer_rect.mLeft, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_outer_rect.mRight, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_outer_rect.mRight, draw_center_rect.mTop, 0.f);
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mTop, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_center_rect.mTop, 0.f);
+            uv[index].set(uv_outer_rect.mLeft, uv_center_rect.mTop);
+            pos[index].set(draw_outer_rect.mLeft, draw_center_rect.mTop, 0.f);
             index++;
 
-            // draw top left
-            uv[index] = LLVector2(uv_outer_rect.mLeft, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_outer_rect.mLeft, draw_center_rect.mTop, 0.f);
+            // draw middle triangles
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_center_rect.mTop, 0.f);
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_outer_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_outer_rect.mTop, 0.f);
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mTop, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_outer_rect.mLeft, uv_outer_rect.mTop);
-            pos[index] = LLVector3(draw_outer_rect.mLeft, draw_outer_rect.mTop, 0.f);
+            // 2
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mBottom, 0.f);
             index++;
 
-            // draw top middle
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_center_rect.mTop, 0.f);
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mTop, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_center_rect.mTop, 0.f);
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mTop, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_outer_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_outer_rect.mTop, 0.f);
+            // draw right triangles
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mBottom, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mLeft, uv_outer_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mLeft, draw_outer_rect.mTop, 0.f);
+            uv[index].set(uv_outer_rect.mRight, uv_center_rect.mBottom);
+            pos[index].set(draw_outer_rect.mRight, draw_center_rect.mBottom, 0.f);
             index++;
 
-            // draw top right
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_center_rect.mTop, 0.f);
+            uv[index].set(uv_outer_rect.mRight, uv_center_rect.mTop);
+            pos[index].set(draw_outer_rect.mRight, draw_center_rect.mTop, 0.f);
+            index++;
+
+            // 2
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mBottom);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mBottom, 0.f);
+            index++;
+
+            uv[index].set(uv_outer_rect.mRight, uv_center_rect.mTop);
+            pos[index].set(draw_outer_rect.mRight, draw_center_rect.mTop, 0.f);
+            index++;
+
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mTop, 0.f);
+            index++;
+
+            // draw top left triangles
+            uv[index].set(uv_outer_rect.mLeft, uv_center_rect.mTop);
+            pos[index].set(draw_outer_rect.mLeft, draw_center_rect.mTop, 0.f);
+            index++;
+
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mTop, 0.f);
+            index++;
+
+            uv[index].set(uv_center_rect.mLeft, uv_outer_rect.mTop);
+            pos[index].set(draw_center_rect.mLeft, draw_outer_rect.mTop, 0.f);
+            index++;
+
+            // 2
+            uv[index].set(uv_outer_rect.mLeft, uv_center_rect.mTop);
+            pos[index].set(draw_outer_rect.mLeft, draw_center_rect.mTop, 0.f);
+            index++;
+
+            uv[index].set(uv_center_rect.mLeft, uv_outer_rect.mTop);
+            pos[index].set(draw_center_rect.mLeft, draw_outer_rect.mTop, 0.f);
+            index++;
+
+            uv[index].set(uv_outer_rect.mLeft, uv_outer_rect.mTop);
+            pos[index].set(draw_outer_rect.mLeft, draw_outer_rect.mTop, 0.f);
+            index++;
+
+            // draw top middle triangles
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mTop, 0.f);
+            index++;
+
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mTop, 0.f);
+            index++;
+
+            uv[index].set(uv_center_rect.mRight, uv_outer_rect.mTop);
+            pos[index].set(draw_center_rect.mRight, draw_outer_rect.mTop, 0.f);
+            index++;
+
+            // 2
+            uv[index].set(uv_center_rect.mLeft, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mLeft, draw_center_rect.mTop, 0.f);
+            index++;
+
+            uv[index].set(uv_center_rect.mRight, uv_outer_rect.mTop);
+            pos[index].set(draw_center_rect.mRight, draw_outer_rect.mTop, 0.f);
+            index++;
+
+            uv[index].set(uv_center_rect.mLeft, uv_outer_rect.mTop);
+            pos[index].set(draw_center_rect.mLeft, draw_outer_rect.mTop, 0.f);
+            index++;
+
+            // draw top right triangles
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mTop, 0.f);
+            index++;
+
+            uv[index].set(uv_outer_rect.mRight, uv_center_rect.mTop);
+            pos[index].set(draw_outer_rect.mRight, draw_center_rect.mTop, 0.f);
+            index++;
+
+            uv[index].set(uv_outer_rect.mRight, uv_outer_rect.mTop);
+            pos[index].set(draw_outer_rect.mRight, draw_outer_rect.mTop, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_outer_rect.mRight, uv_center_rect.mTop);
-            pos[index] = LLVector3(draw_outer_rect.mRight, draw_center_rect.mTop, 0.f);
+            // 2
+            uv[index].set(uv_center_rect.mRight, uv_center_rect.mTop);
+            pos[index].set(draw_center_rect.mRight, draw_center_rect.mTop, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_outer_rect.mRight, uv_outer_rect.mTop);
-            pos[index] = LLVector3(draw_outer_rect.mRight, draw_outer_rect.mTop, 0.f);
+            uv[index].set(uv_outer_rect.mRight, uv_outer_rect.mTop);
+            pos[index].set(draw_outer_rect.mRight, draw_outer_rect.mTop, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_center_rect.mRight, uv_outer_rect.mTop);
-            pos[index] = LLVector3(draw_center_rect.mRight, draw_outer_rect.mTop, 0.f);
+            uv[index].set(uv_center_rect.mRight, uv_outer_rect.mTop);
+            pos[index].set(draw_center_rect.mRight, draw_outer_rect.mTop, 0.f);
             index++;
 
             gGL.vertexBatchPreTransformed(pos, uv, NUM_VERTICES);
@@ -614,8 +717,6 @@ void gl_draw_scaled_rotated_image(S32 x, S32 y, S32 width, S32 height, F32 degre
         return;
     }
 
-    LLGLSUIDefault gls_ui;
-
     if(image != NULL)
     {
         gGL.getTexUnit(0)->bind(image, true);
@@ -629,11 +730,11 @@ void gl_draw_scaled_rotated_image(S32 x, S32 y, S32 width, S32 height, F32 degre
 
     if (degrees == 0.f)
     {
-        const S32 NUM_VERTICES = 4; // 9 quads
-        LLVector2 uv[NUM_VERTICES];
-        LLVector3 pos[NUM_VERTICES];
+        constexpr S32 NUM_VERTICES = 2 * 3;
+        static thread_local LLVector2 uv[NUM_VERTICES +1];
+        static thread_local LLVector4a pos[NUM_VERTICES +1];
 
-        gGL.begin(LLRender::QUADS);
+        gGL.begin(LLRender::TRIANGLES);
         {
             LLVector3 ui_scale = gGL.getUIScale();
             LLVector3 ui_translation = gGL.getUITranslation();
@@ -644,20 +745,28 @@ void gl_draw_scaled_rotated_image(S32 x, S32 y, S32 width, S32 height, F32 degre
             S32 scaled_width = ll_round(width * ui_scale.mV[VX]);
             S32 scaled_height = ll_round(height * ui_scale.mV[VY]);
 
-            uv[index] = LLVector2(uv_rect.mRight, uv_rect.mTop);
-            pos[index] = LLVector3(ui_translation.mV[VX] + scaled_width, ui_translation.mV[VY] + scaled_height, 0.f);
+            uv[index].set(uv_rect.mRight, uv_rect.mTop);
+            pos[index].set(ui_translation.mV[VX] + scaled_width, ui_translation.mV[VY] + scaled_height, 0.f);
+            index++;
+
+            uv[index].set(uv_rect.mLeft, uv_rect.mTop);
+            pos[index].set(ui_translation.mV[VX], ui_translation.mV[VY] + scaled_height, 0.f);
+            index++;
+
+            uv[index].set(uv_rect.mLeft, uv_rect.mBottom);
+            pos[index].set(ui_translation.mV[VX], ui_translation.mV[VY], 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_rect.mLeft, uv_rect.mTop);
-            pos[index] = LLVector3(ui_translation.mV[VX], ui_translation.mV[VY] + scaled_height, 0.f);
+            uv[index].set(uv_rect.mRight, uv_rect.mTop);
+            pos[index].set(ui_translation.mV[VX] + scaled_width, ui_translation.mV[VY] + scaled_height, 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_rect.mLeft, uv_rect.mBottom);
-            pos[index] = LLVector3(ui_translation.mV[VX], ui_translation.mV[VY], 0.f);
+            uv[index].set(uv_rect.mLeft, uv_rect.mBottom);
+            pos[index].set(ui_translation.mV[VX], ui_translation.mV[VY], 0.f);
             index++;
 
-            uv[index] = LLVector2(uv_rect.mRight, uv_rect.mBottom);
-            pos[index] = LLVector3(ui_translation.mV[VX] + scaled_width, ui_translation.mV[VY], 0.f);
+            uv[index].set(uv_rect.mRight, uv_rect.mBottom);
+            pos[index].set(ui_translation.mV[VX] + scaled_width, ui_translation.mV[VY], 0.f);
             index++;
 
             gGL.vertexBatchPreTransformed(pos, uv, NUM_VERTICES);
@@ -687,7 +796,7 @@ void gl_draw_scaled_rotated_image(S32 x, S32 y, S32 width, S32 height, F32 degre
 
         gGL.color4fv(color.mV);
 
-        gGL.begin(LLRender::QUADS);
+        gGL.begin(LLRender::TRIANGLES);
         {
             LLVector3 v;
 
@@ -703,6 +812,14 @@ void gl_draw_scaled_rotated_image(S32 x, S32 y, S32 width, S32 height, F32 degre
             gGL.texCoord2f(uv_rect.mLeft, uv_rect.mBottom);
             gGL.vertex2f(v.mV[0], v.mV[1] );
 
+            v = LLVector3(offset_x, offset_y, 0.f) * quat;
+            gGL.texCoord2f(uv_rect.mRight, uv_rect.mTop);
+            gGL.vertex2f(v.mV[0], v.mV[1]);
+
+            v = LLVector3(-offset_x, -offset_y, 0.f) * quat;
+            gGL.texCoord2f(uv_rect.mLeft, uv_rect.mBottom);
+            gGL.vertex2f(v.mV[0], v.mV[1]);
+
             v = LLVector3(offset_x, -offset_y, 0.f) * quat;
             gGL.texCoord2f(uv_rect.mRight, uv_rect.mBottom);
             gGL.vertex2f(v.mV[0], v.mV[1] );
@@ -948,7 +1065,7 @@ void gl_washer_segment_2d(F32 outer_radius, F32 inner_radius, F32 start_radians,
 
 void gl_rect_2d_simple_tex( S32 width, S32 height )
 {
-    gGL.begin( LLRender::QUADS );
+    gGL.begin( LLRender::TRIANGLES );
 
         gGL.texCoord2f(1.f, 1.f);
         gGL.vertex2i(width, height);
@@ -959,6 +1076,12 @@ void gl_rect_2d_simple_tex( S32 width, S32 height )
         gGL.texCoord2f(0.f, 0.f);
         gGL.vertex2i(0, 0);
 
+        gGL.texCoord2f(1.f, 1.f);
+        gGL.vertex2i(width, height);
+
+        gGL.texCoord2f(0.f, 0.f);
+        gGL.vertex2i(0, 0);
+
         gGL.texCoord2f(1.f, 0.f);
         gGL.vertex2i(width, 0);
 
@@ -967,10 +1090,13 @@ void gl_rect_2d_simple_tex( S32 width, S32 height )
 
 void gl_rect_2d_simple( S32 width, S32 height )
 {
-    gGL.begin( LLRender::QUADS );
+    gGL.begin( LLRender::TRIANGLES );
         gGL.vertex2i(width, height);
         gGL.vertex2i(0, height);
         gGL.vertex2i(0, 0);
+
+        gGL.vertex2i(width, height);
+        gGL.vertex2i(0, 0);
         gGL.vertex2i(width, 0);
     gGL.end();
 }
@@ -1011,7 +1137,7 @@ void gl_segmented_rect_2d_tex(const S32 left,
     LLVector2 width_vec((F32)width, 0.f);
     LLVector2 height_vec(0.f, (F32)height);
 
-    gGL.begin(LLRender::QUADS);
+    gGL.begin(LLRender::TRIANGLES);
     {
         // draw bottom left
         gGL.texCoord2f(0.f, 0.f);
@@ -1023,6 +1149,12 @@ void gl_segmented_rect_2d_tex(const S32 left,
         gGL.texCoord2f(border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
         gGL.vertex2fv((border_width_left + border_height_bottom).mV);
 
+        gGL.texCoord2f(0.f, 0.f);
+        gGL.vertex2f(0.f, 0.f);
+
+        gGL.texCoord2f(border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
+        gGL.vertex2fv((border_width_left + border_height_bottom).mV);
+
         gGL.texCoord2f(0.f, border_uv_scale.mV[VY]);
         gGL.vertex2fv(border_height_bottom.mV);
 
@@ -1036,6 +1168,12 @@ void gl_segmented_rect_2d_tex(const S32 left,
         gGL.texCoord2f(1.f - border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
         gGL.vertex2fv((width_vec - border_width_right + border_height_bottom).mV);
 
+        gGL.texCoord2f(border_uv_scale.mV[VX], 0.f);
+        gGL.vertex2fv(border_width_left.mV);
+
+        gGL.texCoord2f(1.f - border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
+        gGL.vertex2fv((width_vec - border_width_right + border_height_bottom).mV);
+
         gGL.texCoord2f(border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
         gGL.vertex2fv((border_width_left + border_height_bottom).mV);
 
@@ -1049,6 +1187,12 @@ void gl_segmented_rect_2d_tex(const S32 left,
         gGL.texCoord2f(1.f, border_uv_scale.mV[VY]);
         gGL.vertex2fv((width_vec + border_height_bottom).mV);
 
+        gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 0.f);
+        gGL.vertex2fv((width_vec - border_width_right).mV);
+
+        gGL.texCoord2f(1.f, border_uv_scale.mV[VY]);
+        gGL.vertex2fv((width_vec + border_height_bottom).mV);
+
         gGL.texCoord2f(1.f - border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
         gGL.vertex2fv((width_vec - border_width_right + border_height_bottom).mV);
 
@@ -1062,6 +1206,12 @@ void gl_segmented_rect_2d_tex(const S32 left,
         gGL.texCoord2f(border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
         gGL.vertex2fv((border_width_left + height_vec - border_height_top).mV);
 
+        gGL.texCoord2f(0.f, border_uv_scale.mV[VY]);
+        gGL.vertex2fv(border_height_bottom.mV);
+
+        gGL.texCoord2f(border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
+        gGL.vertex2fv((border_width_left + height_vec - border_height_top).mV);
+
         gGL.texCoord2f(0.f, 1.f - border_uv_scale.mV[VY]);
         gGL.vertex2fv((height_vec - border_height_top).mV);
 
@@ -1075,6 +1225,12 @@ void gl_segmented_rect_2d_tex(const S32 left,
         gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
         gGL.vertex2fv((width_vec - border_width_right + height_vec - border_height_top).mV);
 
+        gGL.texCoord2f(border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
+        gGL.vertex2fv((border_width_left + border_height_bottom).mV);
+
+        gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
+        gGL.vertex2fv((width_vec - border_width_right + height_vec - border_height_top).mV);
+
         gGL.texCoord2f(border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
         gGL.vertex2fv((border_width_left + height_vec - border_height_top).mV);
 
@@ -1088,6 +1244,12 @@ void gl_segmented_rect_2d_tex(const S32 left,
         gGL.texCoord2f(1.f, 1.f - border_uv_scale.mV[VY]);
         gGL.vertex2fv((width_vec + height_vec - border_height_top).mV);
 
+        gGL.texCoord2f(1.f - border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
+        gGL.vertex2fv((width_vec - border_width_right + border_height_bottom).mV);
+
+        gGL.texCoord2f(1.f, 1.f - border_uv_scale.mV[VY]);
+        gGL.vertex2fv((width_vec + height_vec - border_height_top).mV);
+
         gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
         gGL.vertex2fv((width_vec - border_width_right + height_vec - border_height_top).mV);
 
@@ -1101,6 +1263,12 @@ void gl_segmented_rect_2d_tex(const S32 left,
         gGL.texCoord2f(border_uv_scale.mV[VX], 1.f);
         gGL.vertex2fv((border_width_left + height_vec).mV);
 
+        gGL.texCoord2f(0.f, 1.f - border_uv_scale.mV[VY]);
+        gGL.vertex2fv((height_vec - border_height_top).mV);
+
+        gGL.texCoord2f(border_uv_scale.mV[VX], 1.f);
+        gGL.vertex2fv((border_width_left + height_vec).mV);
+
         gGL.texCoord2f(0.f, 1.f);
         gGL.vertex2fv((height_vec).mV);
 
@@ -1114,6 +1282,12 @@ void gl_segmented_rect_2d_tex(const S32 left,
         gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 1.f);
         gGL.vertex2fv((width_vec - border_width_right + height_vec).mV);
 
+        gGL.texCoord2f(border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
+        gGL.vertex2fv((border_width_left + height_vec - border_height_top).mV);
+
+        gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 1.f);
+        gGL.vertex2fv((width_vec - border_width_right + height_vec).mV);
+
         gGL.texCoord2f(border_uv_scale.mV[VX], 1.f);
         gGL.vertex2fv((border_width_left + height_vec).mV);
 
@@ -1127,6 +1301,12 @@ void gl_segmented_rect_2d_tex(const S32 left,
         gGL.texCoord2f(1.f, 1.f);
         gGL.vertex2fv((width_vec + height_vec).mV);
 
+        gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
+        gGL.vertex2fv((width_vec - border_width_right + height_vec - border_height_top).mV);
+
+        gGL.texCoord2f(1.f, 1.f);
+        gGL.vertex2fv((width_vec + height_vec).mV);
+
         gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 1.f);
         gGL.vertex2fv((width_vec - border_width_right + height_vec).mV);
     }
@@ -1181,7 +1361,7 @@ void gl_segmented_rect_2d_fragment_tex(const LLRect& rect,
     LLVector2 x_min;
     LLVector2 x_max;
 
-    gGL.begin(LLRender::QUADS);
+    gGL.begin(LLRender::TRIANGLES);
     {
         if (start_fragment < middle_start)
         {
@@ -1200,6 +1380,12 @@ void gl_segmented_rect_2d_fragment_tex(const LLRect& rect,
             gGL.texCoord2f(u_max, border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_max + border_height_bottom).mV);
 
+            gGL.texCoord2f(u_min, 0.f);
+            gGL.vertex2fv(x_min.mV);
+
+            gGL.texCoord2f(u_max, border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_max + border_height_bottom).mV);
+
             gGL.texCoord2f(u_min, border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_min + border_height_bottom).mV);
 
@@ -1213,6 +1399,12 @@ void gl_segmented_rect_2d_fragment_tex(const LLRect& rect,
             gGL.texCoord2f(u_max, 1.f - border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_max + height_vec - border_height_top).mV);
 
+            gGL.texCoord2f(u_min, border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_min + border_height_bottom).mV);
+
+            gGL.texCoord2f(u_max, 1.f - border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_max + height_vec - border_height_top).mV);
+
             gGL.texCoord2f(u_min, 1.f - border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_min + height_vec - border_height_top).mV);
 
@@ -1226,6 +1418,12 @@ void gl_segmented_rect_2d_fragment_tex(const LLRect& rect,
             gGL.texCoord2f(u_max, 1.f);
             gGL.vertex2fv((x_max + height_vec).mV);
 
+            gGL.texCoord2f(u_min, 1.f - border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_min + height_vec - border_height_top).mV);
+
+            gGL.texCoord2f(u_max, 1.f);
+            gGL.vertex2fv((x_max + height_vec).mV);
+
             gGL.texCoord2f(u_min, 1.f);
             gGL.vertex2fv((x_min + height_vec).mV);
         }
@@ -1245,6 +1443,12 @@ void gl_segmented_rect_2d_fragment_tex(const LLRect& rect,
             gGL.texCoord2f(1.f - border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_max + border_height_bottom).mV);
 
+            gGL.texCoord2f(border_uv_scale.mV[VX], 0.f);
+            gGL.vertex2fv(x_min.mV);
+
+            gGL.texCoord2f(1.f - border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_max + border_height_bottom).mV);
+
             gGL.texCoord2f(border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_min + border_height_bottom).mV);
 
@@ -1258,6 +1462,12 @@ void gl_segmented_rect_2d_fragment_tex(const LLRect& rect,
             gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_max + height_vec - border_height_top).mV);
 
+            gGL.texCoord2f(border_uv_scale.mV[VX], border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_min + border_height_bottom).mV);
+
+            gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_max + height_vec - border_height_top).mV);
+
             gGL.texCoord2f(border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_min + height_vec - border_height_top).mV);
 
@@ -1271,6 +1481,12 @@ void gl_segmented_rect_2d_fragment_tex(const LLRect& rect,
             gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 1.f);
             gGL.vertex2fv((x_max + height_vec).mV);
 
+            gGL.texCoord2f(border_uv_scale.mV[VX], 1.f - border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_min + height_vec - border_height_top).mV);
+
+            gGL.texCoord2f(1.f - border_uv_scale.mV[VX], 1.f);
+            gGL.vertex2fv((x_max + height_vec).mV);
+
             gGL.texCoord2f(border_uv_scale.mV[VX], 1.f);
             gGL.vertex2fv((x_min + height_vec).mV);
         }
@@ -1292,6 +1508,12 @@ void gl_segmented_rect_2d_fragment_tex(const LLRect& rect,
             gGL.texCoord2f(u_max, border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_max + border_height_bottom).mV);
 
+            gGL.texCoord2f(u_min, 0.f);
+            gGL.vertex2fv((x_min).mV);
+
+            gGL.texCoord2f(u_max, border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_max + border_height_bottom).mV);
+
             gGL.texCoord2f(u_min, border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_min + border_height_bottom).mV);
 
@@ -1305,6 +1527,12 @@ void gl_segmented_rect_2d_fragment_tex(const LLRect& rect,
             gGL.texCoord2f(u_max, 1.f - border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_max + height_vec - border_height_top).mV);
 
+            gGL.texCoord2f(u_min, border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_min + border_height_bottom).mV);
+
+            gGL.texCoord2f(u_max, 1.f - border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_max + height_vec - border_height_top).mV);
+
             gGL.texCoord2f(u_min, 1.f - border_uv_scale.mV[VY]);
             gGL.vertex2fv((x_min + height_vec - border_height_top).mV);
 
@@ -1318,6 +1546,12 @@ void gl_segmented_rect_2d_fragment_tex(const LLRect& rect,
             gGL.texCoord2f(u_max, 1.f);
             gGL.vertex2fv((x_max + height_vec).mV);
 
+            gGL.texCoord2f(u_min, 1.f - border_uv_scale.mV[VY]);
+            gGL.vertex2fv((x_min + height_vec - border_height_top).mV);
+
+            gGL.texCoord2f(u_max, 1.f);
+            gGL.vertex2fv((x_max + height_vec).mV);
+
             gGL.texCoord2f(u_min, 1.f);
             gGL.vertex2fv((x_min + height_vec).mV);
         }
@@ -1332,7 +1566,7 @@ void gl_segmented_rect_3d_tex(const LLRectf& clip_rect, const LLRectf& center_uv
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_UI;
 
-    gGL.begin(LLRender::QUADS);
+    gGL.begin(LLRender::TRIANGLES);
     {
         // draw bottom left
         gGL.texCoord2f(clip_rect.mLeft, clip_rect.mBottom);
@@ -1344,6 +1578,12 @@ void gl_segmented_rect_3d_tex(const LLRectf& clip_rect, const LLRectf& center_uv
         gGL.texCoord2f(center_uv_rect.mLeft, center_uv_rect.mBottom);
         gGL.vertex3fv((center_draw_rect.mLeft * width_vec + center_draw_rect.mBottom * height_vec).mV);
 
+        gGL.texCoord2f(clip_rect.mLeft, clip_rect.mBottom);
+        gGL.vertex3f(0.f, 0.f, 0.f);
+
+        gGL.texCoord2f(center_uv_rect.mLeft, center_uv_rect.mBottom);
+        gGL.vertex3fv((center_draw_rect.mLeft * width_vec + center_draw_rect.mBottom * height_vec).mV);
+
         gGL.texCoord2f(clip_rect.mLeft, center_uv_rect.mBottom);
         gGL.vertex3fv((center_draw_rect.mBottom * height_vec).mV);
 
@@ -1357,6 +1597,12 @@ void gl_segmented_rect_3d_tex(const LLRectf& clip_rect, const LLRectf& center_uv
         gGL.texCoord2f(center_uv_rect.mRight, center_uv_rect.mBottom);
         gGL.vertex3fv((center_draw_rect.mRight * width_vec + center_draw_rect.mBottom * height_vec).mV);
 
+        gGL.texCoord2f(center_uv_rect.mLeft, clip_rect.mBottom);
+        gGL.vertex3fv((center_draw_rect.mLeft * width_vec).mV);
+
+        gGL.texCoord2f(center_uv_rect.mRight, center_uv_rect.mBottom);
+        gGL.vertex3fv((center_draw_rect.mRight * width_vec + center_draw_rect.mBottom * height_vec).mV);
+
         gGL.texCoord2f(center_uv_rect.mLeft, center_uv_rect.mBottom);
         gGL.vertex3fv((center_draw_rect.mLeft * width_vec + center_draw_rect.mBottom * height_vec).mV);
 
@@ -1370,6 +1616,12 @@ void gl_segmented_rect_3d_tex(const LLRectf& clip_rect, const LLRectf& center_uv
         gGL.texCoord2f(clip_rect.mRight, center_uv_rect.mBottom);
         gGL.vertex3fv((width_vec + center_draw_rect.mBottom * height_vec).mV);
 
+        gGL.texCoord2f(center_uv_rect.mRight, clip_rect.mBottom);
+        gGL.vertex3fv((center_draw_rect.mRight * width_vec).mV);
+
+        gGL.texCoord2f(clip_rect.mRight, center_uv_rect.mBottom);
+        gGL.vertex3fv((width_vec + center_draw_rect.mBottom * height_vec).mV);
+
         gGL.texCoord2f(center_uv_rect.mRight, center_uv_rect.mBottom);
         gGL.vertex3fv((center_draw_rect.mRight * width_vec + center_draw_rect.mBottom * height_vec).mV);
 
@@ -1383,6 +1635,12 @@ void gl_segmented_rect_3d_tex(const LLRectf& clip_rect, const LLRectf& center_uv
         gGL.texCoord2f(center_uv_rect.mLeft, center_uv_rect.mTop);
         gGL.vertex3fv((center_draw_rect.mLeft * width_vec + center_draw_rect.mTop * height_vec).mV);
 
+        gGL.texCoord2f(clip_rect.mLeft, center_uv_rect.mBottom);
+        gGL.vertex3fv((center_draw_rect.mBottom * height_vec).mV);
+
+        gGL.texCoord2f(center_uv_rect.mLeft, center_uv_rect.mTop);
+        gGL.vertex3fv((center_draw_rect.mLeft * width_vec + center_draw_rect.mTop * height_vec).mV);
+
         gGL.texCoord2f(clip_rect.mLeft, center_uv_rect.mTop);
         gGL.vertex3fv((center_draw_rect.mTop * height_vec).mV);
 
@@ -1396,6 +1654,12 @@ void gl_segmented_rect_3d_tex(const LLRectf& clip_rect, const LLRectf& center_uv
         gGL.texCoord2f(center_uv_rect.mRight, center_uv_rect.mTop);
         gGL.vertex3fv((center_draw_rect.mRight * width_vec + center_draw_rect.mTop * height_vec).mV);
 
+        gGL.texCoord2f(center_uv_rect.mLeft, center_uv_rect.mBottom);
+        gGL.vertex3fv((center_draw_rect.mLeft * width_vec + center_draw_rect.mBottom * height_vec).mV);
+
+        gGL.texCoord2f(center_uv_rect.mRight, center_uv_rect.mTop);
+        gGL.vertex3fv((center_draw_rect.mRight * width_vec + center_draw_rect.mTop * height_vec).mV);
+
         gGL.texCoord2f(center_uv_rect.mLeft, center_uv_rect.mTop);
         gGL.vertex3fv((center_draw_rect.mLeft * width_vec + center_draw_rect.mTop * height_vec).mV);
 
@@ -1409,6 +1673,12 @@ void gl_segmented_rect_3d_tex(const LLRectf& clip_rect, const LLRectf& center_uv
         gGL.texCoord2f(clip_rect.mRight, center_uv_rect.mTop);
         gGL.vertex3fv((width_vec + center_draw_rect.mTop * height_vec).mV);
 
+        gGL.texCoord2f(center_uv_rect.mRight, center_uv_rect.mBottom);
+        gGL.vertex3fv((center_draw_rect.mRight* width_vec + center_draw_rect.mBottom * height_vec).mV);
+
+        gGL.texCoord2f(clip_rect.mRight, center_uv_rect.mTop);
+        gGL.vertex3fv((width_vec + center_draw_rect.mTop * height_vec).mV);
+
         gGL.texCoord2f(center_uv_rect.mRight, center_uv_rect.mTop);
         gGL.vertex3fv((center_draw_rect.mRight * width_vec + center_draw_rect.mTop * height_vec).mV);
 
@@ -1422,6 +1692,12 @@ void gl_segmented_rect_3d_tex(const LLRectf& clip_rect, const LLRectf& center_uv
         gGL.texCoord2f(center_uv_rect.mLeft, clip_rect.mTop);
         gGL.vertex3fv((center_draw_rect.mLeft * width_vec + height_vec).mV);
 
+        gGL.texCoord2f(clip_rect.mLeft, center_uv_rect.mTop);
+        gGL.vertex3fv((center_draw_rect.mTop * height_vec).mV);
+
+        gGL.texCoord2f(center_uv_rect.mLeft, clip_rect.mTop);
+        gGL.vertex3fv((center_draw_rect.mLeft * width_vec + height_vec).mV);
+
         gGL.texCoord2f(clip_rect.mLeft, clip_rect.mTop);
         gGL.vertex3fv((height_vec).mV);
 
@@ -1435,6 +1711,12 @@ void gl_segmented_rect_3d_tex(const LLRectf& clip_rect, const LLRectf& center_uv
         gGL.texCoord2f(center_uv_rect.mRight, clip_rect.mTop);
         gGL.vertex3fv((center_draw_rect.mRight * width_vec + height_vec).mV);
 
+        gGL.texCoord2f(center_uv_rect.mLeft, center_uv_rect.mTop);
+        gGL.vertex3fv((center_draw_rect.mLeft * width_vec + center_draw_rect.mTop * height_vec).mV);
+
+        gGL.texCoord2f(center_uv_rect.mRight, clip_rect.mTop);
+        gGL.vertex3fv((center_draw_rect.mRight* width_vec + height_vec).mV);
+
         gGL.texCoord2f(center_uv_rect.mLeft, clip_rect.mTop);
         gGL.vertex3fv((center_draw_rect.mLeft * width_vec + height_vec).mV);
 
@@ -1448,6 +1730,12 @@ void gl_segmented_rect_3d_tex(const LLRectf& clip_rect, const LLRectf& center_uv
         gGL.texCoord2f(clip_rect.mRight, clip_rect.mTop);
         gGL.vertex3fv((width_vec + height_vec).mV);
 
+        gGL.texCoord2f(center_uv_rect.mRight, center_uv_rect.mTop);
+        gGL.vertex3fv((center_draw_rect.mRight* width_vec + center_draw_rect.mTop * height_vec).mV);
+
+        gGL.texCoord2f(clip_rect.mRight, clip_rect.mTop);
+        gGL.vertex3fv((width_vec + height_vec).mV);
+
         gGL.texCoord2f(center_uv_rect.mRight, clip_rect.mTop);
         gGL.vertex3fv((center_draw_rect.mRight * width_vec + height_vec).mV);
     }
diff --git a/indra/llrender/llrendersphere.cpp b/indra/llrender/llrendersphere.cpp
index 9570180554..cd8ef7d68e 100644
--- a/indra/llrender/llrendersphere.cpp
+++ b/indra/llrender/llrendersphere.cpp
@@ -34,6 +34,8 @@
 #include "llerror.h"
 
 #include "llglheaders.h"
+#include "llvertexbuffer.h"
+#include "llglslshader.h"
 
 LLRenderSphere gSphere;
 
@@ -53,12 +55,20 @@ inline LLVector3 polar_to_cart(F32 latitude, F32 longitude)
 
 void LLRenderSphere::renderGGL()
 {
+    LL_PROFILE_ZONE_SCOPED;
     S32 const LATITUDE_SLICES = 20;
     S32 const LONGITUDE_SLICES = 30;
 
-    if (mSpherePoints.empty())
+    if (mVertexBuffer.isNull())
     {
         mSpherePoints.resize(LATITUDE_SLICES + 1);
+        mVertexBuffer = new LLVertexBuffer(LLVertexBuffer::MAP_VERTEX);
+
+        mVertexBuffer->allocateBuffer((U32)(LATITUDE_SLICES + 1) * (LONGITUDE_SLICES + 1), LATITUDE_SLICES * LONGITUDE_SLICES * 6);
+
+        LLStrider<LLVector3> v;
+        mVertexBuffer->getVertexStrider(v);
+
         for (S32 lat_i = 0; lat_i < LATITUDE_SLICES + 1; lat_i++)
         {
             mSpherePoints[lat_i].resize(LONGITUDE_SLICES + 1);
@@ -68,24 +78,52 @@ void LLRenderSphere::renderGGL()
                 F32 lon = (F32)lon_i / LONGITUDE_SLICES;
 
                 mSpherePoints[lat_i][lon_i] = polar_to_cart(lat, lon);
+                v[lat_i * (LONGITUDE_SLICES + 1) + lon_i] = mSpherePoints[lat_i][lon_i];
             }
         }
+
+        LLStrider<U16> i;
+        mVertexBuffer->getIndexStrider(i);
+
+        for (S32 lat_i = 0; lat_i < LATITUDE_SLICES; lat_i++)
+        {
+            for (S32 lon_i = 0; lon_i < LONGITUDE_SLICES; lon_i++)
+            {
+                i[(lat_i * LONGITUDE_SLICES + lon_i) * 6 + 0] = lat_i * (LONGITUDE_SLICES + 1) + lon_i;
+                i[(lat_i * LONGITUDE_SLICES + lon_i) * 6 + 1] = lat_i * (LONGITUDE_SLICES + 1) + lon_i + 1;
+                i[(lat_i * LONGITUDE_SLICES + lon_i) * 6 + 2] = (lat_i + 1) * (LONGITUDE_SLICES + 1) + lon_i;
+
+                i[(lat_i * LONGITUDE_SLICES + lon_i) * 6 + 3] = (lat_i + 1) * (LONGITUDE_SLICES + 1) + lon_i;
+                i[(lat_i * LONGITUDE_SLICES + lon_i) * 6 + 4] = lat_i * (LONGITUDE_SLICES + 1) + lon_i + 1;
+                i[(lat_i * LONGITUDE_SLICES + lon_i) * 6 + 5] = (lat_i + 1) * (LONGITUDE_SLICES + 1) + lon_i + 1;
+            }
+        }
+
+        mVertexBuffer->unmapBuffer();
     }
 
-    gGL.begin(LLRender::TRIANGLES);
 
-    for (S32 lat_i = 0; lat_i < LATITUDE_SLICES; lat_i++)
-    {
-        for (S32 lon_i = 0; lon_i < LONGITUDE_SLICES; lon_i++)
+    if (LLGLSLShader::sCurBoundShaderPtr->mAttributeMask == LLVertexBuffer::MAP_VERTEX)
+    { // shader expects only vertex positions in vertex buffer, use fast path
+        mVertexBuffer->setBuffer();
+        mVertexBuffer->drawRange(LLRender::TRIANGLES, 0, mVertexBuffer->getNumVerts(), mVertexBuffer->getNumIndices(), 0);
+    }
+    else
+    { //shader wants colors in the vertex stream, use slow path
+        gGL.begin(LLRender::TRIANGLES);
+        for (S32 lat_i = 0; lat_i < LATITUDE_SLICES; lat_i++)
         {
-            gGL.vertex3fv(mSpherePoints[lat_i][lon_i].mV);
-            gGL.vertex3fv(mSpherePoints[lat_i][lon_i+1].mV);
-            gGL.vertex3fv(mSpherePoints[lat_i+1][lon_i].mV);
+            for (S32 lon_i = 0; lon_i < LONGITUDE_SLICES; lon_i++)
+            {
+                gGL.vertex3fv(mSpherePoints[lat_i][lon_i].mV);
+                gGL.vertex3fv(mSpherePoints[lat_i][lon_i + 1].mV);
+                gGL.vertex3fv(mSpherePoints[lat_i + 1][lon_i].mV);
 
-            gGL.vertex3fv(mSpherePoints[lat_i+1][lon_i].mV);
-            gGL.vertex3fv(mSpherePoints[lat_i][lon_i+1].mV);
-            gGL.vertex3fv(mSpherePoints[lat_i+1][lon_i+1].mV);
+                gGL.vertex3fv(mSpherePoints[lat_i + 1][lon_i].mV);
+                gGL.vertex3fv(mSpherePoints[lat_i][lon_i + 1].mV);
+                gGL.vertex3fv(mSpherePoints[lat_i + 1][lon_i + 1].mV);
+            }
         }
+        gGL.end();
     }
-    gGL.end();
 }
diff --git a/indra/llrender/llrendersphere.h b/indra/llrender/llrendersphere.h
index e2e886fa06..5b6eabecb8 100644
--- a/indra/llrender/llrendersphere.h
+++ b/indra/llrender/llrendersphere.h
@@ -45,6 +45,7 @@ public:
 
 private:
     std::vector< std::vector<LLVector3> > mSpherePoints;
+    LLPointer<LLVertexBuffer> mVertexBuffer;
 };
 
 extern LLRenderSphere gSphere;
diff --git a/indra/llrender/llrendertarget.cpp b/indra/llrender/llrendertarget.cpp
index f700201ace..38bc5ff331 100644
--- a/indra/llrender/llrendertarget.cpp
+++ b/indra/llrender/llrendertarget.cpp
@@ -475,12 +475,10 @@ void LLRenderTarget::clear(U32 mask_in)
 
 U32 LLRenderTarget::getTexture(U32 attachment) const
 {
-    if (attachment > mTex.size()-1)
-    {
-        LL_ERRS() << "Invalid attachment index." << LL_ENDL;
-    }
-    if (mTex.empty())
+    if (attachment >= mTex.size())
     {
+        LL_WARNS() << "Invalid attachment index " << attachment << " for size " << mTex.size() << LL_ENDL;
+        llassert(false);
         return 0;
     }
     return mTex[attachment];
@@ -511,7 +509,6 @@ void LLRenderTarget::bindTexture(U32 index, S32 channel, LLTexUnit::eTextureFilt
     }
 
     gGL.getTexUnit(channel)->setTextureFilteringOption(filter_options);
-    gGL.getTexUnit(channel)->setTextureColorSpace(isSRGB ? LLTexUnit::TCS_SRGB : LLTexUnit::TCS_LINEAR);
 }
 
 void LLRenderTarget::flush()
diff --git a/indra/llrender/llshadermgr.cpp b/indra/llrender/llshadermgr.cpp
index 512ef340f9..150277c8df 100644
--- a/indra/llrender/llshadermgr.cpp
+++ b/indra/llrender/llshadermgr.cpp
@@ -595,8 +595,15 @@ GLuint LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shader_lev
                 extra_code_text[extra_code_count++] = strdup("precision highp float;\n");
             }
         }
+    }
 
-        extra_code_text[extra_code_count++] = strdup("#define FXAA_GLSL_130 1\n");
+    if (type == GL_FRAGMENT_SHADER)
+    {
+        extra_code_text[extra_code_count++] = strdup("#define FRAGMENT_SHADER 1\n");
+    }
+    else
+    {
+        extra_code_text[extra_code_count++] = strdup("#define VERTEX_SHADER 1\n");
     }
 
     // Use alpha float to store bit flags
@@ -1470,6 +1477,11 @@ void LLShaderMgr::initAttribsAndUniforms()
 
     mReservedUniforms.push_back("debug_normal_draw_length");
 
+    mReservedUniforms.push_back("edgesTex");
+    mReservedUniforms.push_back("areaTex");
+    mReservedUniforms.push_back("searchTex");
+    mReservedUniforms.push_back("blendTex");
+
     llassert(mReservedUniforms.size() == END_RESERVED_UNIFORMS);
 
     std::set<std::string> dupe_check;
diff --git a/indra/llrender/llshadermgr.h b/indra/llrender/llshadermgr.h
index 2b76ef664b..0eb9db6715 100644
--- a/indra/llrender/llshadermgr.h
+++ b/indra/llrender/llshadermgr.h
@@ -332,6 +332,11 @@ public:
 
         DEBUG_NORMAL_DRAW_LENGTH,           //  "debug_normal_draw_length"
 
+        SMAA_EDGE_TEX,                      //  "edgesTex"
+        SMAA_AREA_TEX,                      //  "areaTex"
+        SMAA_SEARCH_TEX,                    //  "searchTex"
+        SMAA_BLEND_TEX,                     //  "blendTex"
+
         END_RESERVED_UNIFORMS
     } eGLSLReservedUniforms;
     // clang-format on
diff --git a/indra/llrender/llvertexbuffer.cpp b/indra/llrender/llvertexbuffer.cpp
index 02afcf12c6..12ae36f4bb 100644
--- a/indra/llrender/llvertexbuffer.cpp
+++ b/indra/llrender/llvertexbuffer.cpp
@@ -36,6 +36,7 @@
 #include "llshadermgr.h"
 #include "llglslshader.h"
 #include "llmemory.h"
+#include <glm/gtc/type_ptr.hpp>
 
 //Next Highest Power Of Two
 //helper function, returns first number > v that is a power of 2, or v if v is already a power of 2
@@ -288,22 +289,58 @@ static GLuint gen_buffer()
     return ret;
 }
 
-#define ANALYZE_VBO_POOL 0
+static void delete_buffers(S32 count, GLuint* buffers)
+{
+    LL_PROFILE_ZONE_SCOPED_CATEGORY_VERTEX;
+    // wait a few frames before actually deleting the buffers to avoid
+    // synchronization issues with the GPU
+    static std::vector<GLuint> sFreeList[4];
 
-#if LL_DARWIN
+    if (gGLManager.mInited)
+    {
+        U32 idx = LLImageGL::sFrameCount % 4;
+
+        for (S32 i = 0; i < count; ++i)
+        {
+            sFreeList[idx].push_back(buffers[i]);
+        }
+
+        idx = (LLImageGL::sFrameCount + 3) % 4;
+
+        if (!sFreeList[idx].empty())
+        {
+            glDeleteBuffers((GLsizei)sFreeList[idx].size(), sFreeList[idx].data());
+            sFreeList[idx].resize(0);
+        }
+    }
+}
 
-// experimental -- disable VBO pooling on OS X and use glMapBuffer
+
+#define ANALYZE_VBO_POOL 0
+
+// VBO Pool interface
 class LLVBOPool
 {
+    public:
+    virtual ~LLVBOPool() = default;
+    virtual void allocate(GLenum type, U32 size, GLuint& name, U8*& data) = 0;
+    virtual void free(GLenum type, U32 size, GLuint name, U8* data) = 0;
+    virtual U64 getVramBytesUsed() = 0;
+};
+
+// VBO Pool for Apple GPUs (as in M1/M2 etc, not Intel macs)
+// Effectively disables VBO pooling
+class LLAppleVBOPool final: public LLVBOPool
+{
 public:
     U64 mAllocated = 0;
 
-    U64 getVramBytesUsed()
+    U64 getVramBytesUsed() override
     {
         return mAllocated;
     }
 
-    void allocate(GLenum type, U32 size, GLuint& name, U8*& data)
+    void allocate(GLenum type, U32 size, GLuint& name, U8*& data) override
     {
         LL_PROFILE_ZONE_SCOPED_CATEGORY_VERTEX;
         STOP_GLERROR;
@@ -323,7 +360,7 @@ public:
         }
     }
 
-    void free(GLenum type, U32 size, GLuint name, U8* data)
+    void free(GLenum type, U32 size, GLuint name, U8* data) override
     {
         LL_PROFILE_ZONE_SCOPED_CATEGORY_VERTEX;
         llassert(type == GL_ARRAY_BUFFER || type == GL_ELEMENT_ARRAY_BUFFER);
@@ -338,19 +375,17 @@ public:
         STOP_GLERROR;
         if (name)
         {
-            glDeleteBuffers(1, &name);
+            delete_buffers(1, &name);
         }
         STOP_GLERROR;
     }
 };
 
-#else
-
-class LLVBOPool
+// VBO Pool for GPUs that benefit from VBO pooling
+class LLDefaultVBOPool final : public LLVBOPool
 {
 public:
     typedef std::chrono::steady_clock::time_point Time;
-
     struct Entry
     {
         U8* mData;
@@ -358,7 +393,7 @@ public:
         Time mAge;
     };
 
-    ~LLVBOPool()
+    ~LLDefaultVBOPool() override
     {
         clear();
     }
@@ -376,7 +411,7 @@ public:
     U32 mMisses = 0;
     U32 mHits = 0;
 
-    U64 getVramBytesUsed()
+    U64 getVramBytesUsed() override
     {
         return mAllocated + mReserved;
     }
@@ -392,7 +427,7 @@ public:
         size += block_size - (size % block_size);
     }
 
-    void allocate(GLenum type, U32 size, GLuint& name, U8*& data)
+    void allocate(GLenum type, U32 size, GLuint& name, U8*& data) override
     {
         LL_PROFILE_ZONE_SCOPED_CATEGORY_VERTEX;
         llassert(type == GL_ARRAY_BUFFER || type == GL_ELEMENT_ARRAY_BUFFER);
@@ -448,7 +483,7 @@ public:
         clean();
     }
 
-    void free(GLenum type, U32 size, GLuint name, U8* data)
+    void free(GLenum type, U32 size, GLuint name, U8* data) override
     {
         LL_PROFILE_ZONE_SCOPED_CATEGORY_VERTEX;
         llassert(type == GL_ARRAY_BUFFER || type == GL_ELEMENT_ARRAY_BUFFER);
@@ -511,7 +546,7 @@ public:
                     LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("vbo cache timeout");
                     auto& entry = entries.back();
                     ll_aligned_free_16(entry.mData);
-                    glDeleteBuffers(1, &entry.mGLName);
+                    delete_buffers(1, &entry.mGLName);
                     llassert(mReserved >= iter->first);
                     mReserved -= iter->first;
                     entries.pop_back();
@@ -547,7 +582,7 @@ public:
             for (auto& entry : entries.second)
             {
                 ll_aligned_free_16(entry.mData);
-                glDeleteBuffers(1, &entry.mGLName);
+                delete_buffers(1, &entry.mGLName);
             }
         }
 
@@ -556,7 +591,7 @@ public:
             for (auto& entry : entries.second)
             {
                 ll_aligned_free_16(entry.mData);
-                glDeleteBuffers(1, &entry.mGLName);
+                delete_buffers(1, &entry.mGLName);
             }
         }
 
@@ -566,10 +601,71 @@ public:
         mVBOPool.clear();
     }
 };
-#endif
 
 static LLVBOPool* sVBOPool = nullptr;
 
+void LLVertexBufferData::drawWithMatrix()
+{
+    if (!mVB)
+    {
+        llassert(false);
+        // Not supposed to happen, check buffer generation
+        return;
+    }
+
+    if (mTexName)
+    {
+        gGL.getTexUnit(0)->bindManual(LLTexUnit::TT_TEXTURE, mTexName);
+    }
+    else
+    {
+        gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
+    }
+
+    gGL.matrixMode(LLRender::MM_MODELVIEW);
+    gGL.pushMatrix();
+    gGL.loadMatrix(glm::value_ptr(mModelView));
+    gGL.matrixMode(LLRender::MM_PROJECTION);
+    gGL.pushMatrix();
+    gGL.loadMatrix(glm::value_ptr(mProjection));
+    gGL.matrixMode(LLRender::MM_TEXTURE0);
+    gGL.pushMatrix();
+    gGL.loadMatrix(glm::value_ptr(mTexture0));
+
+    mVB->setBuffer();
+    mVB->drawArrays(mMode, 0, mCount);
+
+    gGL.popMatrix();
+    gGL.matrixMode(LLRender::MM_PROJECTION);
+    gGL.popMatrix();
+    gGL.matrixMode(LLRender::MM_MODELVIEW);
+    gGL.popMatrix();
+}
+
+void LLVertexBufferData::draw()
+{
+    if (!mVB)
+    {
+        llassert(false);
+        // Not supposed to happen, check buffer generation
+        return;
+    }
+
+    if (mTexName)
+    {
+        gGL.getTexUnit(0)->bindManual(LLTexUnit::TT_TEXTURE, mTexName);
+    }
+    else
+    {
+        gGL.getTexUnit(0)->unbind(LLTexUnit::TT_TEXTURE);
+    }
+
+    mVB->setBuffer();
+    mVB->drawArrays(mMode, 0, mCount);
+}
+
+//============================================================================
+
 //static
 U64 LLVertexBuffer::getBytesAllocated()
 {
@@ -632,7 +728,6 @@ const U32 LLVertexBuffer::sGLMode[LLRender::NUM_MODES] =
     GL_POINTS,
     GL_LINES,
     GL_LINE_STRIP,
-    GL_QUADS,
     GL_LINE_LOOP,
 };
 
@@ -847,7 +942,16 @@ void LLVertexBuffer::drawArrays(U32 mode, U32 first, U32 count) const
 void LLVertexBuffer::initClass(LLWindow* window)
 {
     llassert(sVBOPool == nullptr);
-    sVBOPool = new LLVBOPool();
+    if (gGLManager.mIsApple)
+    {
+        LL_INFOS() << "VBO Pooling Disabled" << LL_ENDL;
+        sVBOPool = new LLAppleVBOPool();
+    }
+    else
+    {
+        LL_INFOS() << "VBO Pooling Enabled" << LL_ENDL;
+        sVBOPool = new LLDefaultVBOPool();
+    }
 
 #if ENABLE_GL_WORK_QUEUE
     sQueue = new GLWorkQueue();
@@ -906,6 +1010,24 @@ LLVertexBuffer::LLVertexBuffer(U32 typemask)
     }
 }
 
+// list of mapped buffers
+// NOTE: must not be LLPointer<LLVertexBuffer> to avoid breaking non-ref-counted LLVertexBuffer instances
+static std::vector<LLVertexBuffer*> sMappedBuffers;
+
+//static
+void LLVertexBuffer::flushBuffers()
+{
+    LL_PROFILE_ZONE_SCOPED_CATEGORY_VERTEX;
+    // must only be called from main thread
+    for (auto& buffer : sMappedBuffers)
+    {
+        buffer->_unmapBuffer();
+        buffer->mMapped = false;
+    }
+
+    sMappedBuffers.resize(0);
+}
+
 //static
 U32 LLVertexBuffer::calcOffsets(const U32& typemask, U32* offsets, U32 num_vertices)
 {
@@ -949,6 +1071,12 @@ U32 LLVertexBuffer::calcVertexSize(const U32& typemask)
 //virtual
 LLVertexBuffer::~LLVertexBuffer()
 {
+    if (mMapped)
+    { // is on the mapped buffer list but doesn't need to be flushed
+        mMapped = false;
+        unmapBuffer();
+    }
+
     destroyGLBuffer();
     destroyGLIndices();
 
@@ -1150,34 +1278,36 @@ bool expand_region(LLVertexBuffer::MappedRegion& region, U32 start, U32 end)
 U8* LLVertexBuffer::mapVertexBuffer(LLVertexBuffer::AttributeType type, U32 index, S32 count)
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_VERTEX;
+    _mapBuffer();
 
     if (count == -1)
     {
         count = mNumVerts - index;
     }
 
-#if !LL_DARWIN
-    U32 start = mOffsets[type] + sTypeSize[type] * index;
-    U32 end = start + sTypeSize[type] * count-1;
-
-    bool flagged = false;
-    // flag region as mapped
-    for (U32 i = 0; i < mMappedVertexRegions.size(); ++i)
+    if (!gGLManager.mIsApple)
     {
-        MappedRegion& region = mMappedVertexRegions[i];
-        if (expand_region(region, start, end))
+        U32 start = mOffsets[type] + sTypeSize[type] * index;
+        U32 end = start + sTypeSize[type] * count-1;
+
+        bool flagged = false;
+        // flag region as mapped
+        for (U32 i = 0; i < mMappedVertexRegions.size(); ++i)
         {
-            flagged = true;
-            break;
+            MappedRegion& region = mMappedVertexRegions[i];
+            if (expand_region(region, start, end))
+            {
+                flagged = true;
+                break;
+            }
         }
-    }
 
-    if (!flagged)
-    {
-        //didn't expand an existing region, make a new one
-        mMappedVertexRegions.push_back({ start, end });
+        if (!flagged)
+        {
+            //didn't expand an existing region, make a new one
+            mMappedVertexRegions.push_back({ start, end });
+        }
     }
-#endif
     return mMappedData+mOffsets[type]+sTypeSize[type]*index;
 }
 
@@ -1185,34 +1315,36 @@ U8* LLVertexBuffer::mapVertexBuffer(LLVertexBuffer::AttributeType type, U32 inde
 U8* LLVertexBuffer::mapIndexBuffer(U32 index, S32 count)
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_VERTEX;
+    _mapBuffer();
 
     if (count == -1)
     {
         count = mNumIndices-index;
     }
 
-#if !LL_DARWIN
-    U32 start = sizeof(U16) * index;
-    U32 end = start + sizeof(U16) * count-1;
-
-    bool flagged = false;
-    // flag region as mapped
-    for (U32 i = 0; i < mMappedIndexRegions.size(); ++i)
+    if (!gGLManager.mIsApple)
     {
-        MappedRegion& region = mMappedIndexRegions[i];
-        if (expand_region(region, start, end))
+        U32 start = sizeof(U16) * index;
+        U32 end = start + sizeof(U16) * count-1;
+
+        bool flagged = false;
+        // flag region as mapped
+        for (U32 i = 0; i < mMappedIndexRegions.size(); ++i)
         {
-            flagged = true;
-            break;
+            MappedRegion& region = mMappedIndexRegions[i];
+            if (expand_region(region, start, end))
+            {
+                flagged = true;
+                break;
+            }
         }
-    }
 
-    if (!flagged)
-    {
-        //didn't expand an existing region, make a new one
-        mMappedIndexRegions.push_back({ start, end });
+        if (!flagged)
+        {
+            //didn't expand an existing region, make a new one
+            mMappedIndexRegions.push_back({ start, end });
+        }
     }
-#endif
 
     return mMappedIndexData + sizeof(U16)*index;
 }
@@ -1225,39 +1357,64 @@ U8* LLVertexBuffer::mapIndexBuffer(U32 index, S32 count)
 //  dst -- mMappedData or mMappedIndexData
 void LLVertexBuffer::flush_vbo(GLenum target, U32 start, U32 end, void* data, U8* dst)
 {
-#if LL_DARWIN
-    LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("vb memcpy");
-    STOP_GLERROR;
-    // copy into mapped buffer
-    memcpy(dst+start, data, end-start+1);
-#else
-    llassert(target == GL_ARRAY_BUFFER ? sGLRenderBuffer == mGLBuffer : sGLRenderIndices == mGLIndices);
-
-    // skip mapped data and stream to GPU via glBufferSubData
-    if (end != 0)
+    if (gGLManager.mIsApple)
     {
-        LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("glBufferSubData");
-        LL_PROFILE_ZONE_NUM(start);
-        LL_PROFILE_ZONE_NUM(end);
-        LL_PROFILE_ZONE_NUM(end-start);
-
-        constexpr U32 block_size = 8192;
+        // on OS X, flush_vbo doesn't actually write to the GL buffer, so be sure to call
+        // _mapBuffer to tag the buffer for flushing to GL
+        _mapBuffer();
+        LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("vb memcpy");
+        STOP_GLERROR;
+        // copy into mapped buffer
+        memcpy(dst+start, data, end-start+1);
+    }
+    else
+    {
+        llassert(target == GL_ARRAY_BUFFER ? sGLRenderBuffer == mGLBuffer : sGLRenderIndices == mGLIndices);
 
-        for (U32 i = start; i <= end; i += block_size)
+        // skip mapped data and stream to GPU via glBufferSubData
+        if (end != 0)
         {
-            LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("glBufferSubData block");
-            //LL_PROFILE_GPU_ZONE("glBufferSubData");
-            U32 tend = llmin(i + block_size, end);
-            U32 size = tend - i + 1;
-            glBufferSubData(target, i, size, (U8*) data + (i-start));
+            LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("glBufferSubData");
+            LL_PROFILE_ZONE_NUM(start);
+            LL_PROFILE_ZONE_NUM(end);
+            LL_PROFILE_ZONE_NUM(end-start);
+
+            constexpr U32 block_size = 65536;
+
+            for (U32 i = start; i <= end; i += block_size)
+            {
+                //LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("glBufferSubData block");
+                //LL_PROFILE_GPU_ZONE("glBufferSubData");
+                U32 tend = llmin(i + block_size, end);
+                U32 size = tend - i + 1;
+                glBufferSubData(target, i, size, (U8*) data + (i-start));
+            }
         }
     }
-#endif
 }
 
 void LLVertexBuffer::unmapBuffer()
 {
+    flushBuffers();
+}
+
+void LLVertexBuffer::_mapBuffer()
+{
+    if (!mMapped)
+    {
+        mMapped = true;
+        sMappedBuffers.push_back(this);
+    }
+}
+
+void LLVertexBuffer::_unmapBuffer()
+{
     STOP_GLERROR;
+    if (!mMapped)
+    {
+        return;
+    }
+
     struct SortMappedRegion
     {
         bool operator()(const MappedRegion& lhs, const MappedRegion& rhs)
@@ -1266,114 +1423,116 @@ void LLVertexBuffer::unmapBuffer()
         }
     };
 
-#if LL_DARWIN
-    STOP_GLERROR;
-    if (mMappedData)
-    {
-        if (mGLBuffer)
-        {
-            glDeleteBuffers(1, &mGLBuffer);
-        }
-        mGLBuffer = gen_buffer();
-        glBindBuffer(GL_ARRAY_BUFFER, mGLBuffer);
-        sGLRenderBuffer = mGLBuffer;
-        glBufferData(GL_ARRAY_BUFFER, mSize, mMappedData, GL_STATIC_DRAW);
-    }
-    else if (mGLBuffer != sGLRenderBuffer)
+    if (gGLManager.mIsApple)
     {
-        glBindBuffer(GL_ARRAY_BUFFER, mGLBuffer);
-        sGLRenderBuffer = mGLBuffer;
-    }
-    STOP_GLERROR;
-
-    if (mMappedIndexData)
-    {
-        if (mGLIndices)
+        STOP_GLERROR;
+        if (mMappedData)
         {
-            glDeleteBuffers(1, &mGLIndices);
+            if (mGLBuffer)
+            {
+                delete_buffers(1, &mGLBuffer);
+            }
+            mGLBuffer = gen_buffer();
+            glBindBuffer(GL_ARRAY_BUFFER, mGLBuffer);
+            sGLRenderBuffer = mGLBuffer;
+            glBufferData(GL_ARRAY_BUFFER, mSize, mMappedData, GL_STATIC_DRAW);
         }
-
-        mGLIndices = gen_buffer();
-        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mGLIndices);
-        sGLRenderIndices = mGLIndices;
-
-        glBufferData(GL_ELEMENT_ARRAY_BUFFER, mIndicesSize, mMappedIndexData, GL_STATIC_DRAW);
-    }
-    else if (mGLIndices != sGLRenderIndices)
-    {
-        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mGLIndices);
-        sGLRenderIndices = mGLIndices;
-    }
-    STOP_GLERROR;
-#else
-
-    if (!mMappedVertexRegions.empty())
-    {
-        LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("unmapBuffer - vertex");
-
-        if (sGLRenderBuffer != mGLBuffer)
+        else if (mGLBuffer != sGLRenderBuffer)
         {
             glBindBuffer(GL_ARRAY_BUFFER, mGLBuffer);
             sGLRenderBuffer = mGLBuffer;
         }
+        STOP_GLERROR;
 
-        U32 start = 0;
-        U32 end = 0;
-
-        std::sort(mMappedVertexRegions.begin(), mMappedVertexRegions.end(), SortMappedRegion());
-
-        for (U32 i = 0; i < mMappedVertexRegions.size(); ++i)
+        if (mMappedIndexData)
         {
-            const MappedRegion& region = mMappedVertexRegions[i];
-            if (region.mStart == end + 1)
+            if (mGLIndices)
             {
-                end = region.mEnd;
+                delete_buffers(1, &mGLIndices);
             }
-            else
-            {
-                flush_vbo(GL_ARRAY_BUFFER, start, end, (U8*)mMappedData + start, mMappedData);
-                start = region.mStart;
-                end = region.mEnd;
-            }
-        }
 
-        flush_vbo(GL_ARRAY_BUFFER, start, end, (U8*)mMappedData + start, mMappedData);
-        mMappedVertexRegions.clear();
-    }
-
-    if (!mMappedIndexRegions.empty())
-    {
-        LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("unmapBuffer - index");
+            mGLIndices = gen_buffer();
+            glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mGLIndices);
+            sGLRenderIndices = mGLIndices;
 
-        if (mGLIndices != sGLRenderIndices)
+            glBufferData(GL_ELEMENT_ARRAY_BUFFER, mIndicesSize, mMappedIndexData, GL_STATIC_DRAW);
+        }
+        else if (mGLIndices != sGLRenderIndices)
         {
             glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mGLIndices);
             sGLRenderIndices = mGLIndices;
         }
-        U32 start = 0;
-        U32 end = 0;
+        STOP_GLERROR;
+    }
+    else
+    {
+        if (!mMappedVertexRegions.empty())
+        {
+            LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("unmapBuffer - vertex");
+
+            if (sGLRenderBuffer != mGLBuffer)
+            {
+                glBindBuffer(GL_ARRAY_BUFFER, mGLBuffer);
+                sGLRenderBuffer = mGLBuffer;
+            }
 
-        std::sort(mMappedIndexRegions.begin(), mMappedIndexRegions.end(), SortMappedRegion());
+            U32 start = 0;
+            U32 end = 0;
 
-        for (U32 i = 0; i < mMappedIndexRegions.size(); ++i)
+            std::sort(mMappedVertexRegions.begin(), mMappedVertexRegions.end(), SortMappedRegion());
+
+            for (U32 i = 0; i < mMappedVertexRegions.size(); ++i)
+            {
+                const MappedRegion& region = mMappedVertexRegions[i];
+                if (region.mStart == end + 1)
+                {
+                    end = region.mEnd;
+                }
+                else
+                {
+                    flush_vbo(GL_ARRAY_BUFFER, start, end, (U8*)mMappedData + start, mMappedData);
+                    start = region.mStart;
+                    end = region.mEnd;
+                }
+            }
+
+            flush_vbo(GL_ARRAY_BUFFER, start, end, (U8*)mMappedData + start, mMappedData);
+            mMappedVertexRegions.clear();
+        }
+
+        if (!mMappedIndexRegions.empty())
         {
-            const MappedRegion& region = mMappedIndexRegions[i];
-            if (region.mStart == end + 1)
+            LL_PROFILE_ZONE_NAMED_CATEGORY_VERTEX("unmapBuffer - index");
+
+            if (mGLIndices != sGLRenderIndices)
             {
-                end = region.mEnd;
+                glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mGLIndices);
+                sGLRenderIndices = mGLIndices;
             }
-            else
+            U32 start = 0;
+            U32 end = 0;
+
+            std::sort(mMappedIndexRegions.begin(), mMappedIndexRegions.end(), SortMappedRegion());
+
+            for (U32 i = 0; i < mMappedIndexRegions.size(); ++i)
             {
-                flush_vbo(GL_ELEMENT_ARRAY_BUFFER, start, end, (U8*)mMappedIndexData + start, mMappedIndexData);
-                start = region.mStart;
-                end = region.mEnd;
+                const MappedRegion& region = mMappedIndexRegions[i];
+                if (region.mStart == end + 1)
+                {
+                    end = region.mEnd;
+                }
+                else
+                {
+                    flush_vbo(GL_ELEMENT_ARRAY_BUFFER, start, end, (U8*)mMappedIndexData + start, mMappedIndexData);
+                    start = region.mStart;
+                    end = region.mEnd;
+                }
             }
-        }
 
-        flush_vbo(GL_ELEMENT_ARRAY_BUFFER, start, end, (U8*)mMappedIndexData + start, mMappedIndexData);
-        mMappedIndexRegions.clear();
+            flush_vbo(GL_ELEMENT_ARRAY_BUFFER, start, end, (U8*)mMappedIndexData + start, mMappedIndexData);
+            mMappedIndexRegions.clear();
+        }
     }
-#endif
 }
 
 //----------------------------------------------------------------------------
@@ -1495,12 +1654,13 @@ bool LLVertexBuffer::getClothWeightStrider(LLStrider<LLVector4>& strider, U32 in
 void LLVertexBuffer::setBuffer()
 {
     STOP_GLERROR;
-#if LL_DARWIN
-    if (!mGLBuffer)
-    { // OS X doesn't allocate a buffer until we call unmapBuffer
-        return;
+
+    if (mMapped)
+    {
+        LL_WARNS_ONCE() << "Missing call to unmapBuffer or flushBuffers" << LL_ENDL;
+        _unmapBuffer();
     }
-#endif
+
     // no data may be pending
     llassert(mMappedVertexRegions.empty());
     llassert(mMappedIndexRegions.empty());
diff --git a/indra/llrender/llvertexbuffer.h b/indra/llrender/llvertexbuffer.h
index 4ada0c335b..375ad76fb8 100644
--- a/indra/llrender/llvertexbuffer.h
+++ b/indra/llrender/llvertexbuffer.h
@@ -38,6 +38,7 @@
 #include <set>
 #include <vector>
 #include <list>
+#include <glm/gtc/matrix_transform.hpp>
 
 #define LL_MAX_VERTEX_ATTRIB_LOCATION 64
 
@@ -53,6 +54,41 @@
 //============================================================================
 // base class
 class LLPrivateMemoryPool;
+class LLVertexBuffer;
+
+class LLVertexBufferData
+{
+public:
+    LLVertexBufferData()
+        : mVB(nullptr)
+        , mMode(0)
+        , mCount(0)
+        , mTexName(0)
+        , mProjection(glm::identity<glm::mat4>())
+        , mModelView(glm::identity<glm::mat4>())
+        , mTexture0(glm::identity<glm::mat4>())
+    {}
+    LLVertexBufferData(LLVertexBuffer* buffer, U8 mode, U32 count, U32 tex_name, const glm::mat4& model_view, const glm::mat4& projection, const glm::mat4& texture0)
+        : mVB(buffer)
+        , mMode(mode)
+        , mCount(count)
+        , mTexName(tex_name)
+        , mProjection(model_view)
+        , mModelView(projection)
+        , mTexture0(texture0)
+    {}
+    void drawWithMatrix();
+    void draw();
+    LLPointer<LLVertexBuffer> mVB;
+    U8 mMode;
+    U32 mCount;
+    U32 mTexName;
+    glm::mat4 mProjection;
+    glm::mat4 mModelView;
+    glm::mat4 mTexture0;
+};
+typedef std::list<LLVertexBufferData> buffer_data_list_t;
+
 class LLVertexBuffer final : public LLRefCount
 {
 public:
@@ -89,6 +125,9 @@ public:
     // indexed by the following enum
     static U32 calcOffsets(const U32& typemask, U32* offsets, U32 num_vertices);
 
+    // flush any pending mapped buffers
+    static void flushBuffers();
+
     //WARNING -- when updating these enums you MUST
     // 1 - update LLVertexBuffer::sTypeSize
     // 2 - update LLVertexBuffer::vb_type_name
@@ -159,6 +198,8 @@ public:
     // map for data access (see also getFooStrider below)
     U8*     mapVertexBuffer(AttributeType type, U32 index, S32 count = -1);
     U8*     mapIndexBuffer(U32 index, S32 count = -1);
+
+    // synonym for flushBuffers
     void    unmapBuffer();
 
     // set for rendering
@@ -281,6 +322,13 @@ private:
 
     bool    allocateBuffer(S32 nverts, S32 nindices, bool create) { return allocateBuffer(nverts, nindices); }
 
+    // actually unmap buffer
+    void _unmapBuffer();
+
+    // add to set of mapped buffers
+    void _mapBuffer();
+    bool mMapped = false;
+
 public:
 
     static U64 getBytesAllocated();