Merge with viewer-experimental

13 files changed, 635 insertions, 180 deletions

diff --git a/indra/llrender/llfontgl.cpp b/indra/llrender/llfontgl.cpp
index d9e1976341..82db922368 100644
--- a/indra/llrender/llfontgl.cpp
+++ b/indra/llrender/llfontgl.cpp
@@ -247,7 +247,6 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 		}
 	}
 
-
 	const LLFontGlyphInfo* next_glyph = NULL;
 
 	for (i = begin_offset; i < begin_offset + length; i++)
diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index a3f7a946ec..7ff68fe34b 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -185,6 +185,9 @@ PFNGLRENDERBUFFERSTORAGEMULTISAMPLEEXTPROC glRenderbufferStorageMultisampleEXT =
 // GL_EXT_framebuffer_blit
 PFNGLBLITFRAMEBUFFEREXTPROC glBlitFramebufferEXT = NULL;
 
+// GL_EXT_blend_func_separate
+PFNGLBLENDFUNCSEPARATEEXTPROC glBlendFuncSeparateEXT = NULL;
+
 // GL_ARB_draw_buffers
 PFNGLDRAWBUFFERSARBPROC glDrawBuffersARB = NULL;
 
@@ -324,6 +327,7 @@ LLGLManager::LLGLManager() :
 	mHasCompressedTextures(FALSE),
 	mHasFramebufferObject(FALSE),
 	mHasFramebufferMultisample(FALSE),
+	mHasBlendFuncSeparate(FALSE),
 
 	mHasVertexBufferObject(FALSE),
 	mHasPBuffer(FALSE),
@@ -633,6 +637,11 @@ void LLGLManager::initExtensions()
 #else
 	mHasDrawBuffers = FALSE;
 # endif
+# if GL_EXT_blend_func_separate
+	mHasBlendFuncSeparate = TRUE;
+#else
+	mHasBlendFuncSeparate = FALSE;
+# endif
 	mHasMipMapGeneration = FALSE;
 	mHasSeparateSpecularColor = FALSE;
 	mHasAnisotropic = FALSE;
@@ -659,6 +668,7 @@ void LLGLManager::initExtensions()
 		&& ExtensionExists("GL_EXT_packed_depth_stencil", gGLHExts.mSysExts);
 	mHasFramebufferMultisample = mHasFramebufferObject && ExtensionExists("GL_EXT_framebuffer_multisample", gGLHExts.mSysExts);
 	mHasDrawBuffers = ExtensionExists("GL_ARB_draw_buffers", gGLHExts.mSysExts);
+	mHasBlendFuncSeparate = ExtensionExists("GL_EXT_blend_func_separate", gGLHExts.mSysExts);
 	mHasTextureRectangle = ExtensionExists("GL_ARB_texture_rectangle", gGLHExts.mSysExts);
 #if !LL_DARWIN
 	mHasPointParameters = !mIsATI && ExtensionExists("GL_ARB_point_parameters", gGLHExts.mSysExts);
@@ -682,6 +692,7 @@ void LLGLManager::initExtensions()
 		mHasFramebufferObject = FALSE;
 		mHasFramebufferMultisample = FALSE;
 		mHasDrawBuffers = FALSE;
+		mHasBlendFuncSeparate = FALSE;
 		mHasMipMapGeneration = FALSE;
 		mHasSeparateSpecularColor = FALSE;
 		mHasAnisotropic = FALSE;
@@ -706,6 +717,7 @@ void LLGLManager::initExtensions()
 		mHasShaderObjects = FALSE;
 		mHasVertexShader = FALSE;
 		mHasFragmentShader = FALSE;
+		mHasBlendFuncSeparate = FALSE;
 		LL_WARNS("RenderInit") << "GL extension support forced to SIMPLE level via LL_GL_BASICEXT" << LL_ENDL;
 	}
 	if (getenv("LL_GL_BLACKLIST"))	/* Flawfinder: ignore */
@@ -734,7 +746,8 @@ void LLGLManager::initExtensions()
 		if (strchr(blacklist,'r')) mHasDrawBuffers = FALSE;//S
 		if (strchr(blacklist,'s')) mHasFramebufferMultisample = FALSE;
 		if (strchr(blacklist,'t')) mHasTextureRectangle = FALSE;
-
+		if (strchr(blacklist,'u')) mHasBlendFuncSeparate = FALSE;//S
+		
 	}
 #endif // LL_LINUX || LL_SOLARIS
 	
@@ -782,6 +795,14 @@ void LLGLManager::initExtensions()
 	{
 		LL_INFOS("RenderInit") << "Couldn't initialize GL_ARB_fragment_shader" << LL_ENDL;
 	}
+	if (!mHasBlendFuncSeparate)
+	{
+		LL_INFOS("RenderInit") << "Couldn't initialize GL_EXT_blend_func_separate" << LL_ENDL;
+	}
+	if (!mHasDrawBuffers)
+	{
+		LL_INFOS("RenderInit") << "Couldn't initialize GL_ARB_draw_buffers" << LL_ENDL;
+	}
 
 	// Disable certain things due to known bugs
 	if (mIsIntel && mHasMipMapGeneration)
@@ -852,6 +873,10 @@ void LLGLManager::initExtensions()
 	{
 		glDrawBuffersARB = (PFNGLDRAWBUFFERSARBPROC) GLH_EXT_GET_PROC_ADDRESS("glDrawBuffersARB");
 	}
+	if (mHasBlendFuncSeparate)
+	{
+		glBlendFuncSeparateEXT = (PFNGLBLENDFUNCSEPARATEEXTPROC) GLH_EXT_GET_PROC_ADDRESS("glBlendFuncSeparateEXT");
+	}
 #if (!LL_LINUX && !LL_SOLARIS) || LL_LINUX_NV_GL_HEADERS
 	// This is expected to be a static symbol on Linux GL implementations, except if we use the nvidia headers - bah
 	glDrawRangeElements = (PFNGLDRAWRANGEELEMENTSPROC)GLH_EXT_GET_PROC_ADDRESS("glDrawRangeElements");
@@ -1014,24 +1039,9 @@ void flush_glerror()
 	glGetError();
 }
 
-void assert_glerror()
+void do_assert_glerror()
 {
-	if (!gGLActive)
-	{
-		//llwarns << "GL used while not active!" << llendl;
-
-		if (gDebugSession)
-		{
-			//ll_fail("GL used while not active");
-		}
-	}
-
-	if (gNoRender || !gDebugGL) 
-	{
-		return;
-	}
-	
-	if (!gGLManager.mInited)
+	if (LL_UNLIKELY(!gGLManager.mInited))
 	{
 		LL_ERRS("RenderInit") << "GL not initialized" << LL_ENDL;
 	}
@@ -1039,10 +1049,9 @@ void assert_glerror()
 	GLenum error;
 	error = glGetError();
 	BOOL quit = FALSE;
-	while (error)
+	while (LL_UNLIKELY(error))
 	{
 		quit = TRUE;
-#ifndef LL_LINUX // *FIX: !  This should be an error for linux as well.
 		GLubyte const * gl_error_msg = gluErrorString(error);
 		if (NULL != gl_error_msg)
 		{
@@ -1066,7 +1075,6 @@ void assert_glerror()
 			}
 		}
 		error = glGetError();
-#endif
 	}
 
 	if (quit)
@@ -1082,6 +1090,25 @@ void assert_glerror()
 	}
 }
 
+void assert_glerror()
+{
+	if (!gGLActive)
+	{
+		//llwarns << "GL used while not active!" << llendl;
+
+		if (gDebugSession)
+		{
+			//ll_fail("GL used while not active");
+		}
+	}
+
+	if (!gNoRender && gDebugGL) 
+	{
+		do_assert_glerror();
+	}
+}
+	
+
 void clear_glerror()
 {
 	//  Create or update texture to be used with this data 
diff --git a/indra/llrender/llgl.h b/indra/llrender/llgl.h
index 91421f3c95..0c2da7dd08 100644
--- a/indra/llrender/llgl.h
+++ b/indra/llrender/llgl.h
@@ -87,6 +87,7 @@ public:
 	BOOL mHasCompressedTextures;
 	BOOL mHasFramebufferObject;
 	BOOL mHasFramebufferMultisample;
+	BOOL mHasBlendFuncSeparate;
 	
 	// ARB Extensions
 	BOOL mHasVertexBufferObject;
diff --git a/indra/llrender/llglheaders.h b/indra/llrender/llglheaders.h
index f33ae7d8f0..f6d35bc766 100644
--- a/indra/llrender/llglheaders.h
+++ b/indra/llrender/llglheaders.h
@@ -216,6 +216,9 @@ extern PFNGLGETCOMPRESSEDTEXIMAGEARBPROC glGetCompressedTexImageARB;
 
 extern PFNGLCOLORTABLEEXTPROC glColorTableEXT;
 
+//GL_EXT_blend_func_separate
+extern PFNGLBLENDFUNCSEPARATEEXTPROC glBlendFuncSeparateEXT;
+
 //GL_EXT_framebuffer_object
 extern PFNGLISRENDERBUFFEREXTPROC glIsRenderbufferEXT;
 extern PFNGLBINDRENDERBUFFEREXTPROC glBindRenderbufferEXT;
@@ -249,7 +252,10 @@ extern PFNGLGENERATEMIPMAPEXTPROC glGenerateMipmapEXT;
 # include "GL/glh_extensions.h"
 # undef __APPLE__
 
-#elif LL_LINUX 
+#elif LL_LINUX
+//----------------------------------------------------------------------------
+// LL_LINUX
+
 //----------------------------------------------------------------------------
 // Linux, MESA headers, but not necessarily assuming MESA runtime.
 // quotes so we get libraries/.../GL/ version
@@ -285,6 +291,7 @@ extern PFNGLGENERATEMIPMAPEXTPROC glGenerateMipmapEXT;
 # define LL_LINUX_NV_GL_HEADERS 0
 #endif // LL_LINUX && defined(WINGDIAPI)
 
+
 #if LL_LINUX_NV_GL_HEADERS
 // Missing functions when using nvidia headers:
 extern PFNGLACTIVETEXTUREARBPROC	glActiveTextureARB;
@@ -445,6 +452,9 @@ extern PFNGLGETATTRIBLOCATIONARBPROC glGetAttribLocationARB;
 extern PFNGLCOMPRESSEDTEXIMAGE2DARBPROC glCompressedTexImage2DARB;
 extern PFNGLGETCOMPRESSEDTEXIMAGEARBPROC glGetCompressedTexImageARB;
 
+//GL_EXT_blend_func_separate
+extern PFNGLBLENDFUNCSEPARATEEXTPROC glBlendFuncSeparateEXT;
+
 //GL_EXT_framebuffer_object
 extern PFNGLISRENDERBUFFEREXTPROC glIsRenderbufferEXT;
 extern PFNGLBINDRENDERBUFFEREXTPROC glBindRenderbufferEXT;
@@ -473,7 +483,10 @@ extern PFNGLBLITFRAMEBUFFEREXTPROC glBlitFramebufferEXT;
 //GL_ARB_draw_buffers
 extern PFNGLDRAWBUFFERSARBPROC glDrawBuffersARB;
 
+
 #elif LL_WINDOWS
+//----------------------------------------------------------------------------
+// LL_WINDOWS
 
 // windows gl headers depend on things like APIENTRY, so include windows.
 #define WIN32_LEAN_AND_MEAN
@@ -641,6 +654,9 @@ extern PFNGLBINDATTRIBLOCATIONARBPROC glBindAttribLocationARB;
 extern PFNGLGETACTIVEATTRIBARBPROC glGetActiveAttribARB;
 extern PFNGLGETATTRIBLOCATIONARBPROC glGetAttribLocationARB;
 
+//GL_EXT_blend_func_separate
+extern PFNGLBLENDFUNCSEPARATEEXTPROC glBlendFuncSeparateEXT;
+
 //GL_EXT_framebuffer_object
 extern PFNGLISRENDERBUFFEREXTPROC glIsRenderbufferEXT;
 extern PFNGLBINDRENDERBUFFEREXTPROC glBindRenderbufferEXT;
@@ -669,6 +685,7 @@ extern PFNGLBLITFRAMEBUFFEREXTPROC glBlitFramebufferEXT;
 //GL_ARB_draw_buffers
 extern PFNGLDRAWBUFFERSARBPROC glDrawBuffersARB;
 
+
 #elif LL_DARWIN
 //----------------------------------------------------------------------------
 // LL_DARWIN
@@ -685,6 +702,9 @@ extern PFNGLDRAWBUFFERSARBPROC glDrawBuffersARB;
 // Note that they also must not be called on 10.3.9.  This should be taken care of by a runtime check for the existence of the GL extension.
 #include <AvailabilityMacros.h>
 
+//GL_EXT_blend_func_separate
+extern void glBlendFuncSeparateEXT(GLenum srcRGB, GLenum dstRGB, GLenum srcAlpha, GLenum dstAlpha) AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
+
 // GL_EXT_framebuffer_object
 extern GLboolean glIsRenderbufferEXT(GLuint renderbuffer) AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
 extern void glBindRenderbufferEXT(GLenum target, GLuint renderbuffer) AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER;
diff --git a/indra/llrender/llglslshader.cpp b/indra/llrender/llglslshader.cpp
index ca92cb6580..9256e3959c 100644
--- a/indra/llrender/llglslshader.cpp
+++ b/indra/llrender/llglslshader.cpp
@@ -61,7 +61,7 @@ BOOL shouldChange(const LLVector4& v1, const LLVector4& v2)
 
 LLShaderFeatures::LLShaderFeatures()
 : calculatesLighting(false), isShiny(false), isFullbright(false), hasWaterFog(false),
-hasTransport(false), hasSkinning(false), hasAtmospherics(false), isSpecular(false),
+hasTransport(false), hasSkinning(false), hasObjectSkinning(false), hasAtmospherics(false), isSpecular(false),
 hasGamma(false), hasLighting(false), calculatesAtmospherics(false)
 {
 }
@@ -124,7 +124,7 @@ BOOL LLGLSLShader::createShader(vector<string> * attributes,
 	{
 		GLhandleARB shaderhandle = LLShaderMgr::instance()->loadShaderFile((*fileIter).first, mShaderLevel, (*fileIter).second);
 		LL_DEBUGS("ShaderLoading") << "SHADER FILE: " << (*fileIter).first << " mShaderLevel=" << mShaderLevel << LL_ENDL;
-		if (mShaderLevel > 0)
+		if (shaderhandle > 0)
 		{
 			attachObject(shaderhandle);
 		}
@@ -717,6 +717,18 @@ GLint LLGLSLShader::getUniformLocation(const string& uniform)
 	return -1;
 }
 
+GLint LLGLSLShader::getAttribLocation(U32 attrib)
+{
+	if (attrib < mAttribute.size())
+	{
+		return mAttribute[attrib];
+	}
+	else
+	{
+		return -1;
+	}
+}
+
 void LLGLSLShader::uniform1i(const string& uniform, GLint v)
 {
 	GLint location = getUniformLocation(uniform);
diff --git a/indra/llrender/llglslshader.h b/indra/llrender/llglslshader.h
index 166d4af04c..dc493ba162 100644
--- a/indra/llrender/llglslshader.h
+++ b/indra/llrender/llglslshader.h
@@ -48,6 +48,7 @@ public:
 	bool hasWaterFog; // implies no gamma
 	bool hasTransport; // implies no lighting (it's possible to have neither though)
 	bool hasSkinning;	
+	bool hasObjectSkinning;
 	bool hasAtmospherics;
 	bool hasGamma;
 
@@ -109,7 +110,7 @@ public:
 	void vertexAttrib4fv(U32 index, GLfloat* v);
 	
 	GLint getUniformLocation(const std::string& uniform);
-	
+	GLint getAttribLocation(U32 attrib);
 	GLint mapUniformTextureChannel(GLint location, GLenum type);
 	
 
diff --git a/indra/llrender/llimagegl.cpp b/indra/llrender/llimagegl.cpp
index ff47c57c70..2579bad0b6 100644
--- a/indra/llrender/llimagegl.cpp
+++ b/indra/llrender/llimagegl.cpp
@@ -1645,7 +1645,7 @@ void LLImageGL::calcAlphaChannelOffsetAndStride()
 	}
 }
 
-void LLImageGL::analyzeAlpha(const void* data_in, S32 w, S32 h)
+void LLImageGL::analyzeAlpha(const void* data_in, U32 w, U32 h)
 {
 	if(!mNeedsAlphaAndPickMask)
 	{
@@ -1653,26 +1653,91 @@ void LLImageGL::analyzeAlpha(const void* data_in, S32 w, S32 h)
 	}
 
 	U32 length = w * h;
-	const GLubyte* current = ((const GLubyte*) data_in) + mAlphaOffset ;
+	U32 alphatotal = 0;
 	
-	S32 sample[16];
-	memset(sample, 0, sizeof(S32)*16);
-
-	for (U32 i = 0; i < length; i++)
+	U32 sample[16];
+	memset(sample, 0, sizeof(U32)*16);
+
+	// generate histogram of quantized alpha.
+	// also add-in the histogram of a 2x2 box-sampled version.  The idea is
+	// 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)
+	{
+		llassert(w%2 == 0);
+		llassert(h%2 == 0);
+		const GLubyte* rowstart = ((const GLubyte*) data_in) + mAlphaOffset;
+		for (U32 y = 0; y < h; y+=2)
+		{
+			const GLubyte* current = rowstart;
+			for (U32 x = 0; x < w; x+=2)
+			{
+				const U32 s1 = current[0];
+				alphatotal += s1;
+				const U32 s2 = current[w * mAlphaStride];
+				alphatotal += s2;
+				current += mAlphaStride;
+				const U32 s3 = current[0];
+				alphatotal += s3;
+				const U32 s4 = current[w * mAlphaStride];
+				alphatotal += s4;
+				current += mAlphaStride;
+
+				++sample[s1/16];
+				++sample[s2/16];
+				++sample[s3/16];
+				++sample[s4/16];
+
+				const U32 asum = (s1+s2+s3+s4);
+				alphatotal += asum;
+				sample[asum/(16*4)] += 4;
+			}
+			
+			rowstart += 2 * w * mAlphaStride;
+		}
+		length *= 2; // we sampled everything twice, essentially
+	}
+	else
 	{
-		++sample[*current/16];
-		current += mAlphaStride ;
+		const GLubyte* current = ((const GLubyte*) data_in) + mAlphaOffset;
+		for (U32 i = 0; i < length; i++)
+		{
+			const U32 s1 = *current;
+			alphatotal += s1;
+			++sample[s1/16];
+			current += mAlphaStride;
+		}
 	}
+	
+	// if more than 1/16th of alpha samples are mid-range, this
+	// shouldn't be treated as a 1-bit mask
 
-	U32 total = 0;
+	// also, if all of the alpha samples are clumped on one half
+	// of the range (but not at an absolute extreme), then consider
+	// this to be an intentional effect and don't treat as a mask.
+
+	U32 midrangetotal = 0;
 	for (U32 i = 4; i < 11; i++)
 	{
-		total += sample[i];
+		midrangetotal += sample[i];
+	}
+	U32 lowerhalftotal = 0;
+	for (U32 i = 0; i < 8; i++)
+	{
+		lowerhalftotal += sample[i];
+	}
+	U32 upperhalftotal = 0;
+	for (U32 i = 8; i < 16; i++)
+	{
+		upperhalftotal += sample[i];
 	}
 
-	if (total > length/16)
+	if (midrangetotal > length/16 || // lots of midrange, or
+	    (lowerhalftotal == length && alphatotal != 0) || // all close to transparent but not all totally transparent, or
+	    (upperhalftotal == length && alphatotal != 255*length)) // all close to opaque but not all totally opaque
 	{
-		mIsMask = FALSE;
+		mIsMask = FALSE; // not suitable for masking
 	}
 	else
 	{
@@ -1748,7 +1813,7 @@ BOOL LLImageGL::getMask(const LLVector2 &tc)
 		{
 			LL_WARNS_ONCE("render") << "Ugh, non-finite u/v in mask pick" << LL_ENDL;
 			u = v = 0.f;
-			llassert(false);
+			//llassert(false);
 		}
 
 		if (LL_UNLIKELY(u < 0.f || u > 1.f ||
@@ -1756,7 +1821,7 @@ BOOL LLImageGL::getMask(const LLVector2 &tc)
 		{
 			LL_WARNS_ONCE("render") << "Ugh, u/v out of range in image mask pick" << LL_ENDL;
 			u = v = 0.f;
-			llassert(false);
+			//llassert(false);
 		}
 
 		S32 x = llfloor(u * mPickMaskWidth);
diff --git a/indra/llrender/llimagegl.h b/indra/llrender/llimagegl.h
index 41239d24c8..03939888a5 100644
--- a/indra/llrender/llimagegl.h
+++ b/indra/llrender/llimagegl.h
@@ -91,7 +91,7 @@ public:
 protected:
 	virtual ~LLImageGL();
 
-	void analyzeAlpha(const void* data_in, S32 w, S32 h);
+	void analyzeAlpha(const void* data_in, U32 w, U32 h);
 	void calcAlphaChannelOffsetAndStride();
 
 public:
diff --git a/indra/llrender/llrender.cpp b/indra/llrender/llrender.cpp
index c3540a717c..70601663e6 100644
--- a/indra/llrender/llrender.cpp
+++ b/indra/llrender/llrender.cpp
@@ -39,6 +39,7 @@
 #include "llimagegl.h"
 #include "llrendertarget.h"
 #include "lltexture.h"
+#include "llvector4a.h"
 
 LLRender gGL;
 
@@ -53,6 +54,7 @@ U32 LLRender::sUICalls = 0;
 U32 LLRender::sUIVerts = 0;
 
 static const U32 LL_NUM_TEXTURE_LAYERS = 16; 
+static const U32 LL_MAX_UI_STACK_DEPTH = 32;
 
 static GLenum sGLTextureType[] =
 {
@@ -165,6 +167,7 @@ void LLTexUnit::enable(eTextureType type)
 	if ( (mCurrTexType != type || gGL.mDirty) && (type != TT_NONE) )
 	{
 		activate();
+
 		if (mCurrTexType != TT_NONE && !gGL.mDirty)
 		{
 			disable(); // Force a disable of a previous texture type if it's enabled.
@@ -756,14 +759,27 @@ LLRender::LLRender()
     mCount(0),
     mMode(LLRender::TRIANGLES),
     mCurrTextureUnitIndex(0),
-    mMaxAnisotropy(0.f) 
+    mMaxAnisotropy(0.f),
+	mUIStackDepth(0)
 {
 	mBuffer = new LLVertexBuffer(immediate_mask, 0);
 	mBuffer->allocateBuffer(4096, 0, TRUE);
-	mBuffer->getVertexStrider(mVerticesp);
-	mBuffer->getTexCoord0Strider(mTexcoordsp);
-	mBuffer->getColorStrider(mColorsp);
-	
+
+	LLStrider<LLVector3> vert;
+	LLStrider<LLVector2> tc;
+	LLStrider<LLColor4U> color;
+
+	mBuffer->getVertexStrider(vert);
+	mBuffer->getTexCoord0Strider(tc);
+	mBuffer->getColorStrider(color);
+
+	mVerticesp = (LLVector4a*) vert.get();
+	mTexcoordsp = tc.get();
+	mColorsp = color.get();
+
+	mUIOffset = (LLVector4a*) ll_aligned_malloc_16(LL_MAX_UI_STACK_DEPTH*sizeof(LLVector4a));
+	mUIScale = (LLVector4a*) ll_aligned_malloc_16(LL_MAX_UI_STACK_DEPTH*sizeof(LLVector4a));
+		
 	mTexUnits.reserve(LL_NUM_TEXTURE_LAYERS);
 	for (U32 i = 0; i < LL_NUM_TEXTURE_LAYERS; i++)
 	{
@@ -778,8 +794,11 @@ LLRender::LLRender()
 
 	mCurrAlphaFunc = CF_DEFAULT;
 	mCurrAlphaFuncVal = 0.01f;
-	mCurrBlendSFactor = BF_UNDEF;
-	mCurrBlendDFactor = BF_UNDEF;
+
+	mCurrBlendColorSFactor = BF_UNDEF;
+	mCurrBlendAlphaSFactor = BF_UNDEF;
+	mCurrBlendColorDFactor = BF_UNDEF;
+	mCurrBlendAlphaDFactor = BF_UNDEF;
 }
 
 LLRender::~LLRender()
@@ -796,6 +815,11 @@ void LLRender::shutdown()
 	mTexUnits.clear();
 	delete mDummyTexUnit;
 	mDummyTexUnit = NULL;
+
+	ll_aligned_free_16(mUIOffset);
+	mUIOffset = NULL;
+	ll_aligned_free_16(mUIScale);
+	mUIScale = NULL;
 }
 
 void LLRender::refreshState(void)
@@ -844,84 +868,83 @@ void LLRender::popMatrix()
 
 void LLRender::translateUI(F32 x, F32 y, F32 z)
 {
-	if (mUIOffset.empty())
+	if (mUIStackDepth == 0)
 	{
 		llerrs << "Need to push a UI translation frame before offsetting" << llendl;
 	}
 
-	mUIOffset.front().mV[0] += x;
-	mUIOffset.front().mV[1] += y;
-	mUIOffset.front().mV[2] += z;
+	LLVector4a trans(x,y,z);
+	mUIOffset[mUIStackDepth-1].add(trans);
 }
 
 void LLRender::scaleUI(F32 x, F32 y, F32 z)
 {
-	if (mUIScale.empty())
+	if (mUIStackDepth == 0)
 	{
 		llerrs << "Need to push a UI transformation frame before scaling." << llendl;
 	}
 
-	mUIScale.front().scaleVec(LLVector3(x,y,z));
+	LLVector4a scale(x,y,z);
+	mUIScale[mUIStackDepth-1].mul(scale);
 }
 
 void LLRender::pushUIMatrix()
 {
-	if (mUIOffset.empty())
+	if (mUIStackDepth == 0)
 	{
-		mUIOffset.push_front(LLVector3(0,0,0));
+		mUIOffset[0].clear();
+		mUIScale[0].splat(1.f);
 	}
-	else
+	else if (mUIStackDepth < LL_MAX_UI_STACK_DEPTH)
 	{
-		mUIOffset.push_front(mUIOffset.front());
-	}
-	
-	if (mUIScale.empty())
-	{
-		mUIScale.push_front(LLVector3(1,1,1));
+		mUIOffset[mUIStackDepth] = mUIOffset[mUIStackDepth-1];
+		mUIScale[mUIStackDepth] = mUIScale[mUIStackDepth-1];
 	}
 	else
 	{
-		mUIScale.push_front(mUIScale.front());
+		llerrs << "Blown UI matrix stack." << llendl;
 	}
+	
+	++mUIStackDepth;
+	
 }
 
 void LLRender::popUIMatrix()
 {
-	if (mUIOffset.empty())
+	if (mUIStackDepth == 0)
 	{
 		llerrs << "UI offset stack blown." << llendl;
 	}
-	mUIOffset.pop_front();
-	mUIScale.pop_front();
+	--mUIStackDepth;
 }
 
 LLVector3 LLRender::getUITranslation()
 {
-	if (mUIOffset.empty())
+	if (mUIStackDepth == 0)
 	{
 		llerrs << "UI offset stack empty." << llendl;
 	}
-	return mUIOffset.front();
+	return LLVector3(mUIOffset[mUIStackDepth-1].getF32());
 }
 
 LLVector3 LLRender::getUIScale()
 {
-	if (mUIScale.empty())
+	if (mUIStackDepth == 0)
 	{
 		llerrs << "UI scale stack empty." << llendl;
 	}
-	return mUIScale.front();
+	return LLVector3(mUIScale[mUIStackDepth-1].getF32());
 }
 
 
 void LLRender::loadUIIdentity()
 {
-	if (mUIOffset.empty())
+	if (mUIStackDepth == 0)
 	{
 		llerrs << "Need to push UI translation frame before clearing offset." << llendl;
 	}
-	mUIOffset.front().setVec(0,0,0);
-	mUIScale.front().setVec(1,1,1);
+	mUIOffset[mUIStackDepth-1].clear();
+	mUIScale[mUIStackDepth-1].splat(1.f);
 }
 
 void LLRender::setColorMask(bool writeColor, bool writeAlpha)
@@ -995,15 +1018,44 @@ void LLRender::blendFunc(eBlendFactor sfactor, eBlendFactor dfactor)
 {
 	llassert(sfactor < BF_UNDEF);
 	llassert(dfactor < BF_UNDEF);
-	if (mCurrBlendSFactor != sfactor || mCurrBlendDFactor != dfactor)
+	if (mCurrBlendColorSFactor != sfactor || mCurrBlendColorDFactor != dfactor ||
+	    mCurrBlendAlphaSFactor != sfactor || mCurrBlendAlphaDFactor != dfactor)
 	{
-		mCurrBlendSFactor = sfactor;
-		mCurrBlendDFactor = dfactor;
+		mCurrBlendColorSFactor = sfactor;
+		mCurrBlendAlphaSFactor = sfactor;
+		mCurrBlendColorDFactor = dfactor;
+		mCurrBlendAlphaDFactor = dfactor;
 		flush();
 		glBlendFunc(sGLBlendFactor[sfactor], sGLBlendFactor[dfactor]);
 	}
 }
 
+void LLRender::blendFunc(eBlendFactor color_sfactor, eBlendFactor color_dfactor,
+			 eBlendFactor alpha_sfactor, eBlendFactor alpha_dfactor)
+{
+	llassert(color_sfactor < BF_UNDEF);
+	llassert(color_dfactor < BF_UNDEF);
+	llassert(alpha_sfactor < BF_UNDEF);
+	llassert(alpha_dfactor < BF_UNDEF);
+	if (!gGLManager.mHasBlendFuncSeparate)
+	{
+		LL_WARNS_ONCE("render") << "no glBlendFuncSeparateEXT(), using color-only blend func" << llendl;
+		blendFunc(color_sfactor, color_dfactor);
+		return;
+	}
+	if (mCurrBlendColorSFactor != color_sfactor || mCurrBlendColorDFactor != color_dfactor ||
+	    mCurrBlendAlphaSFactor != alpha_sfactor || mCurrBlendAlphaDFactor != alpha_dfactor)
+	{
+		mCurrBlendColorSFactor = color_sfactor;
+		mCurrBlendAlphaSFactor = alpha_sfactor;
+		mCurrBlendColorDFactor = color_dfactor;
+		mCurrBlendAlphaDFactor = alpha_dfactor;
+		flush();
+		glBlendFuncSeparateEXT(sGLBlendFactor[color_sfactor], sGLBlendFactor[color_dfactor],
+				       sGLBlendFactor[alpha_sfactor], sGLBlendFactor[alpha_dfactor]);
+	}
+}
+
 LLTexUnit* LLRender::getTexUnit(U32 index)
 {
 	if (index < mTexUnits.size())
@@ -1121,7 +1173,7 @@ void LLRender::flush()
 		}
 #endif
 				
-		if (!mUIOffset.empty())
+		if (mUIStackDepth > 0)
 		{
 			sUICalls++;
 			sUIVerts += mCount;
@@ -1173,24 +1225,22 @@ void LLRender::vertex3f(const GLfloat& x, const GLfloat& y, const GLfloat& z)
 		return;
 	}
 
-	if (mUIOffset.empty())
-	{
-		mVerticesp[mCount] = LLVector3(x,y,z);
-	}
-	else
+	LLVector3& v = reinterpret_cast<LLVector3&>(mVerticesp[mCount]);
+	v.set(x,y,z);
+	if (mUIStackDepth != 0)
 	{
-		LLVector3 vert = (LLVector3(x,y,z)+mUIOffset.front()).scaledVec(mUIScale.front());
-		mVerticesp[mCount] = vert;
+		v += reinterpret_cast<LLVector3&>(mUIOffset[mUIStackDepth-1]);
+		v.scaleVec(reinterpret_cast<LLVector3&>(mUIScale[mUIStackDepth-1]));
 	}
 
 	mCount++;
 	if (mCount < 4096)
 	{
-		mVerticesp[mCount] = mVerticesp[mCount-1];
 		mColorsp[mCount] = mColorsp[mCount-1];
 		mTexcoordsp[mCount] = mTexcoordsp[mCount-1];
 	}
 }
+
 void LLRender::vertex2i(const GLint& x, const GLint& y)
 {
 	vertex3f((GLfloat) x, (GLfloat) y, 0);	
diff --git a/indra/llrender/llrender.h b/indra/llrender/llrender.h
index a90fbd4a5c..11cd95646f 100644
--- a/indra/llrender/llrender.h
+++ b/indra/llrender/llrender.h
@@ -45,6 +45,7 @@
 #include "v4coloru.h"
 #include "llstrider.h"
 #include "llpointer.h"
+#include "llmemory.h"
 #include "llglheaders.h"
 
 class LLVertexBuffer;
@@ -52,6 +53,7 @@ class LLCubeMap;
 class LLImageGL;
 class LLRenderTarget;
 class LLTexture ;
+class LLVector4a;
 
 class LLTexUnit
 {
@@ -323,7 +325,11 @@ public:
 
 	void setAlphaRejectSettings(eCompareFunc func, F32 value = 0.01f);
 
+	// applies blend func to both color and alpha
 	void blendFunc(eBlendFactor sfactor, eBlendFactor dfactor);
+	// applies separate blend functions to color and alpha
+	void blendFunc(eBlendFactor color_sfactor, eBlendFactor color_dfactor,
+		       eBlendFactor alpha_sfactor, eBlendFactor alpha_dfactor);
 
 	LLTexUnit* getTexUnit(U32 index);
 
@@ -356,20 +362,23 @@ private:
 	F32				mCurrAlphaFuncVal;
 
 	LLPointer<LLVertexBuffer>	mBuffer;
-	LLStrider<LLVector3>		mVerticesp;
-	LLStrider<LLVector2>		mTexcoordsp;
-	LLStrider<LLColor4U>		mColorsp;
+	LLVector4a*					mVerticesp;
+	LLVector2*					mTexcoordsp;
+	LLColor4U*					mColorsp;
+
 	std::vector<LLTexUnit*>		mTexUnits;
 	LLTexUnit*			mDummyTexUnit;
 
-	eBlendFactor mCurrBlendSFactor;
-	eBlendFactor mCurrBlendDFactor;
-
+	eBlendFactor mCurrBlendColorSFactor;
+	eBlendFactor mCurrBlendColorDFactor;
+	eBlendFactor mCurrBlendAlphaSFactor;
+	eBlendFactor mCurrBlendAlphaDFactor;
 	F32				mMaxAnisotropy;
 
-	std::list<LLVector3> mUIOffset;
-	std::list<LLVector3> mUIScale;
+	LLVector4a* mUIOffset;
+	LLVector4a* mUIScale;
 
+	U32 mUIStackDepth;
 };
 
 extern F64 gGLModelView[16];
diff --git a/indra/llrender/llshadermgr.cpp b/indra/llrender/llshadermgr.cpp
index 1286e91e49..0f54ebeb69 100644
--- a/indra/llrender/llshadermgr.cpp
+++ b/indra/llrender/llshadermgr.cpp
@@ -152,6 +152,14 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 			return FALSE;
 		}
 	}
+
+	if (features->hasObjectSkinning)
+	{
+		if (!shader->attachObject("avatar/objectSkinV.glsl"))
+		{
+			return FALSE;
+		}
+	}
 	
 	///////////////////////////////////////
 	// Attach Fragment Shader Features Next
@@ -313,11 +321,14 @@ void LLShaderMgr::dumpObjectLog(GLhandleARB ret, BOOL warns)
 
 GLhandleARB LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shader_level, GLenum type)
 {
-	GLenum error;
-	error = glGetError();
-	if (error != GL_NO_ERROR)
+	GLenum error = GL_NO_ERROR;
+	if (gDebugGL)
 	{
-		LL_WARNS("ShaderLoading") << "GL ERROR entering loadShaderFile(): " << error << LL_ENDL;
+		error = glGetError();
+		if (error != GL_NO_ERROR)
+		{
+			LL_WARNS("ShaderLoading") << "GL ERROR entering loadShaderFile(): " << error << LL_ENDL;
+		}
 	}
 	
 	LL_DEBUGS("ShaderLoading") << "Loading shader file: " << filename << " class " << shader_level << LL_ENDL;
@@ -372,31 +383,39 @@ GLhandleARB LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shade
 
 	//create shader object
 	GLhandleARB ret = glCreateShaderObjectARB(type);
-	error = glGetError();
-	if (error != GL_NO_ERROR)
+	if (gDebugGL)
 	{
-		LL_WARNS("ShaderLoading") << "GL ERROR in glCreateShaderObjectARB: " << error << LL_ENDL;
+		error = glGetError();
+		if (error != GL_NO_ERROR)
+		{
+			LL_WARNS("ShaderLoading") << "GL ERROR in glCreateShaderObjectARB: " << error << LL_ENDL;
+		}
 	}
-	else
+	
+	//load source
+	glShaderSourceARB(ret, count, (const GLcharARB**) text, NULL);
+
+	if (gDebugGL)
 	{
-		//load source
-		glShaderSourceARB(ret, count, (const GLcharARB**) text, NULL);
 		error = glGetError();
 		if (error != GL_NO_ERROR)
 		{
 			LL_WARNS("ShaderLoading") << "GL ERROR in glShaderSourceARB: " << error << LL_ENDL;
 		}
-		else
+	}
+
+	//compile source
+	glCompileShaderARB(ret);
+
+	if (gDebugGL)
+	{
+		error = glGetError();
+		if (error != GL_NO_ERROR)
 		{
-			//compile source
-			glCompileShaderARB(ret);
-			error = glGetError();
-			if (error != GL_NO_ERROR)
-			{
-				LL_WARNS("ShaderLoading") << "GL ERROR in glCompileShaderARB: " << error << LL_ENDL;
-			}
+			LL_WARNS("ShaderLoading") << "GL ERROR in glCompileShaderARB: " << error << LL_ENDL;
 		}
 	}
+		
 	//free memory
 	for (GLuint i = 0; i < count; i++)
 	{
@@ -407,13 +426,16 @@ GLhandleARB LLShaderMgr::loadShaderFile(const std::string& filename, S32 & shade
 		//check for errors
 		GLint success = GL_TRUE;
 		glGetObjectParameterivARB(ret, GL_OBJECT_COMPILE_STATUS_ARB, &success);
-		error = glGetError();
-		if (error != GL_NO_ERROR || success == GL_FALSE) 
+		if (gDebugGL || success == GL_FALSE)
 		{
-			//an error occured, print log
-			LL_WARNS("ShaderLoading") << "GLSL Compilation Error: (" << error << ") in " << filename << LL_ENDL;
-			dumpObjectLog(ret);
-			ret = 0;
+			error = glGetError();
+			if (error != GL_NO_ERROR || success == GL_FALSE) 
+			{
+				//an error occured, print log
+				LL_WARNS("ShaderLoading") << "GLSL Compilation Error: (" << error << ") in " << filename << LL_ENDL;
+				dumpObjectLog(ret);
+				ret = 0;
+			}
 		}
 	}
 	else
diff --git a/indra/llrender/llvertexbuffer.cpp b/indra/llrender/llvertexbuffer.cpp
index bf5eda21eb..48c20b09a8 100644
--- a/indra/llrender/llvertexbuffer.cpp
+++ b/indra/llrender/llvertexbuffer.cpp
@@ -31,6 +31,7 @@
  */
 
 #include "linden_common.h"
+#include "llmemory.h"
 
 #include <boost/static_assert.hpp>
 
@@ -39,6 +40,7 @@
 #include "llglheaders.h"
 #include "llmemtype.h"
 #include "llrender.h"
+#include "llvector4a.h"
 
 //============================================================================
 
@@ -61,9 +63,32 @@ BOOL LLVertexBuffer::sVBOActive = FALSE;
 BOOL LLVertexBuffer::sIBOActive = FALSE;
 U32 LLVertexBuffer::sAllocatedBytes = 0;
 BOOL LLVertexBuffer::sMapped = FALSE;
+BOOL LLVertexBuffer::sUseStreamDraw = TRUE;
+S32	LLVertexBuffer::sWeight4Loc = -1;
 
 std::vector<U32> LLVertexBuffer::sDeleteList;
 
+#define LL_ALIGNED_VB 1
+
+#if LL_ALIGNED_VB
+
+S32 LLVertexBuffer::sTypeOffsets[LLVertexBuffer::TYPE_MAX] =
+{
+	sizeof(LLVector4), // TYPE_VERTEX,
+	sizeof(LLVector4), // TYPE_NORMAL,
+	sizeof(LLVector2), // TYPE_TEXCOORD0,
+	sizeof(LLVector2), // TYPE_TEXCOORD1,
+	sizeof(LLVector2), // TYPE_TEXCOORD2,
+	sizeof(LLVector2), // TYPE_TEXCOORD3,
+	sizeof(LLColor4U), // TYPE_COLOR,
+	sizeof(LLVector4), // TYPE_BINORMAL,
+	sizeof(F32),	   // TYPE_WEIGHT,
+	sizeof(LLVector4), // TYPE_WEIGHT4,
+	sizeof(LLVector4), // TYPE_CLOTHWEIGHT,
+};
+
+#else
+
 S32 LLVertexBuffer::sTypeOffsets[LLVertexBuffer::TYPE_MAX] =
 {
 	sizeof(LLVector3), // TYPE_VERTEX,
@@ -75,9 +100,12 @@ S32 LLVertexBuffer::sTypeOffsets[LLVertexBuffer::TYPE_MAX] =
 	sizeof(LLColor4U), // TYPE_COLOR,
 	sizeof(LLVector3), // TYPE_BINORMAL,
 	sizeof(F32),	   // TYPE_WEIGHT,
+	sizeof(LLVector4), // TYPE_WEIGHT4,
 	sizeof(LLVector4), // TYPE_CLOTHWEIGHT,
 };
 
+#endif
+
 U32 LLVertexBuffer::sGLMode[LLRender::NUM_MODES] = 
 {
 	GL_TRIANGLES,
@@ -209,14 +237,33 @@ void LLVertexBuffer::setupClientArrays(U32 data_mask)
 			glClientActiveTextureARB(GL_TEXTURE0_ARB);
 		}
 	
+		if (sLastMask & MAP_WEIGHT4)
+		{
+			if (sWeight4Loc < 0)
+			{
+				llerrs << "Weighting disabled but vertex buffer still bound!" << llendl;
+			}
+
+			if (!(data_mask & MAP_WEIGHT4))
+			{ //disable 4-component skin weight			
+				glDisableVertexAttribArrayARB(sWeight4Loc);
+			}
+		}
+		else if (data_mask & MAP_WEIGHT4)
+		{
+			if (sWeight4Loc >= 0)
+			{ //enable 4-component skin weight
+				glEnableVertexAttribArrayARB(sWeight4Loc);
+			}
+		}
+				
+
 		sLastMask = data_mask;
 	}
 }
 
-void LLVertexBuffer::drawRange(U32 mode, U32 start, U32 end, U32 count, U32 indices_offset) const
+void LLVertexBuffer::validateRange(U32 start, U32 end, U32 count, U32 indices_offset) const
 {
-	llassert(mRequestedNumVerts >= 0);
-
 	if (start >= (U32) mRequestedNumVerts ||
 	    end >= (U32) mRequestedNumVerts)
 	{
@@ -231,6 +278,25 @@ void LLVertexBuffer::drawRange(U32 mode, U32 start, U32 end, U32 count, U32 indi
 		llerrs << "Bad index buffer draw range: [" << indices_offset << ", " << indices_offset+count << "]" << llendl;
 	}
 
+	if (gDebugGL && !useVBOs())
+	{
+		U16* idx = ((U16*) getIndicesPointer())+indices_offset;
+		for (U32 i = 0; i < count; ++i)
+		{
+			if (idx[i] < start || idx[i] > end)
+			{
+				llerrs << "Index out of range: " << idx[i] << " not in [" << start << ", " << end << "]" << llendl;
+			}
+		}
+	}
+}
+
+void LLVertexBuffer::drawRange(U32 mode, U32 start, U32 end, U32 count, U32 indices_offset) const
+{
+	validateRange(start, end, count, indices_offset);
+
+	llassert(mRequestedNumVerts >= 0);
+
 	if (mGLIndices != sGLRenderIndices)
 	{
 		llerrs << "Wrong index buffer bound." << llendl;
@@ -247,9 +313,11 @@ void LLVertexBuffer::drawRange(U32 mode, U32 start, U32 end, U32 count, U32 indi
 		return;
 	}
 
+	U16* idx = ((U16*) getIndicesPointer())+indices_offset;
+
 	stop_glerror();
 	glDrawRangeElements(sGLMode[mode], start, end, count, GL_UNSIGNED_SHORT, 
-		((U16*) getIndicesPointer()) + indices_offset);
+		idx);
 	stop_glerror();
 }
 
@@ -381,16 +449,52 @@ LLVertexBuffer::LLVertexBuffer(U32 typemask, S32 usage) :
 	{
 		mUsage = 0 ; 
 	}
+
+	if (mUsage == GL_STREAM_DRAW_ARB && !sUseStreamDraw)
+	{
+		mUsage = 0;
+	}
 	
 	S32 stride = calcStride(typemask, mOffsets);
 
 	mTypeMask = typemask;
 	mStride = stride;
+	mAlignedOffset = 0;
+	mAlignedIndexOffset = 0;
+
 	sCount++;
 }
 
+#if LL_ALIGNED_VB
 //static
-S32 LLVertexBuffer::calcStride(const U32& typemask, S32* offsets)
+S32 LLVertexBuffer::calcStride(const U32& typemask, S32* offsets, S32 num_vertices)
+{
+	S32 offset = 0;
+	for (S32 i=0; i<TYPE_MAX; i++)
+	{
+		U32 mask = 1<<i;
+		if (typemask & mask)
+		{
+			if (offsets)
+			{
+				offsets[i] = offset;
+				offset += LLVertexBuffer::sTypeOffsets[i]*num_vertices;
+				offset = (offset + 0xF) & ~0xF;
+			}
+		}
+	}
+
+	return offset+16;
+}
+
+S32 LLVertexBuffer::getSize() const
+{
+	return mStride;
+}
+
+#else
+//static
+S32 LLVertexBuffer::calcStride(const U32& typemask, S32* offsets, S32 num_vertices)
 {
 	S32 stride = 0;
 	for (S32 i=0; i<TYPE_MAX; i++)
@@ -409,6 +513,12 @@ S32 LLVertexBuffer::calcStride(const U32& typemask, S32* offsets)
 	return stride;
 }
 
+S32 LLVertexBuffer::getSize() const
+{ 
+	return mNumVerts*mStride; 
+}
+
+#endif
 // protected, use unref()
 //virtual
 LLVertexBuffer::~LLVertexBuffer()
@@ -518,7 +628,7 @@ void LLVertexBuffer::createGLBuffer()
 	{
 		static int gl_buffer_idx = 0;
 		mGLBuffer = ++gl_buffer_idx;
-		mMappedData = new U8[size];
+		mMappedData = (U8*) ll_aligned_malloc_16(size);
 		memset(mMappedData, 0, size);
 	}
 }
@@ -540,16 +650,20 @@ void LLVertexBuffer::createGLIndices()
 
 	mEmpty = TRUE;
 
+	//pad by 16 bytes for aligned copies
+	size += 16;
+
 	if (useVBOs())
 	{
+		//pad by another 16 bytes for VBO pointer adjustment
+		size += 16;
 		mMappedIndexData = NULL;
 		genIndices();
 		mResized = TRUE;
 	}
 	else
 	{
-		mMappedIndexData = new U8[size];
-		memset(mMappedIndexData, 0, size);
+		mMappedIndexData = (U8*) ll_aligned_malloc_16(size);
 		static int gl_buffer_idx = 0;
 		mGLIndices = ++gl_buffer_idx;
 	}
@@ -570,7 +684,7 @@ void LLVertexBuffer::destroyGLBuffer()
 		}
 		else
 		{
-			delete [] mMappedData;
+			ll_aligned_free_16(mMappedData);
 			mMappedData = NULL;
 			mEmpty = TRUE;
 		}
@@ -579,7 +693,7 @@ void LLVertexBuffer::destroyGLBuffer()
 	}
 	
 	mGLBuffer = 0;
-	unbind();
+	//unbind();
 }
 
 void LLVertexBuffer::destroyGLIndices()
@@ -597,7 +711,7 @@ void LLVertexBuffer::destroyGLIndices()
 		}
 		else
 		{
-			delete [] mMappedIndexData;
+			ll_aligned_free_16(mMappedIndexData);
 			mMappedIndexData = NULL;
 			mEmpty = TRUE;
 		}
@@ -606,7 +720,7 @@ void LLVertexBuffer::destroyGLIndices()
 	}
 
 	mGLIndices = 0;
-	unbind();
+	//unbind();
 }
 
 void LLVertexBuffer::updateNumVerts(S32 nverts)
@@ -622,7 +736,7 @@ void LLVertexBuffer::updateNumVerts(S32 nverts)
 	}
 
 	mRequestedNumVerts = nverts;
-	
+
 	if (!mDynamicSize)
 	{
 		mNumVerts = nverts;
@@ -637,6 +751,9 @@ void LLVertexBuffer::updateNumVerts(S32 nverts)
 		}
 		mNumVerts = nverts;
 	}
+#if LL_ALIGNED_VB
+	mStride = calcStride(mTypeMask, mOffsets, mNumVerts);
+#endif
 
 }
 
@@ -668,6 +785,12 @@ void LLVertexBuffer::allocateBuffer(S32 nverts, S32 nindices, bool create)
 {
 	LLMemType mt2(LLMemType::MTYPE_VERTEX_ALLOCATE_BUFFER);
 		
+	if (nverts < 0 || nindices < 0 ||
+		nverts > 65536)
+	{
+		llerrs << "Bad vertex buffer allocation: " << nverts << " : " << nindices << llendl;
+	}
+
 	updateNumVerts(nverts);
 	updateNumIndices(nindices);
 	
@@ -706,9 +829,6 @@ void LLVertexBuffer::resizeBuffer(S32 newnverts, S32 newnindices)
 	{
 		sAllocatedBytes -= getSize() + getIndicesSize();
 		
-		S32 oldsize = getSize();
-		S32 old_index_size = getIndicesSize();
-
 		updateNumVerts(newnverts);		
 		updateNumIndices(newnindices);
 		
@@ -725,26 +845,10 @@ void LLVertexBuffer::resizeBuffer(S32 newnverts, S32 newnindices)
 			}
 			else
 			{
-				//delete old buffer, keep GL buffer for now
 				if (!useVBOs())
 				{
-					U8* old = mMappedData;
-					mMappedData = new U8[newsize];
-					if (old)
-					{	
-						memcpy(mMappedData, old, llmin(newsize, oldsize));
-						if (newsize > oldsize)
-						{
-							memset(mMappedData+oldsize, 0, newsize-oldsize);
-						}
-
-						delete [] old;
-					}
-					else
-					{
-						memset(mMappedData, 0, newsize);
-						mEmpty = TRUE;
-					}
+					ll_aligned_free_16(mMappedData);
+					mMappedData = (U8*) ll_aligned_malloc_16(newsize);
 				}
 				mResized = TRUE;
 			}
@@ -764,24 +868,8 @@ void LLVertexBuffer::resizeBuffer(S32 newnverts, S32 newnindices)
 			{
 				if (!useVBOs())
 				{
-					//delete old buffer, keep GL buffer for now
-					U8* old = mMappedIndexData;
-					mMappedIndexData = new U8[new_index_size];
-					
-					if (old)
-					{	
-						memcpy(mMappedIndexData, old, llmin(new_index_size, old_index_size));
-						if (new_index_size > old_index_size)
-						{
-							memset(mMappedIndexData+old_index_size, 0, new_index_size - old_index_size);
-						}
-						delete [] old;
-					}
-					else
-					{
-						memset(mMappedIndexData, 0, new_index_size);
-						mEmpty = TRUE;
-					}
+					ll_aligned_free_16(mMappedIndexData);
+					mMappedIndexData = (U8*) ll_aligned_malloc_16(new_index_size);
 				}
 				mResized = TRUE;
 			}
@@ -813,7 +901,7 @@ BOOL LLVertexBuffer::useVBOs() const
 		return FALSE;
 	}
 #endif
-	return sEnableVBOs;
+	return TRUE;
 }
 
 //----------------------------------------------------------------------------
@@ -838,12 +926,19 @@ U8* LLVertexBuffer::mapBuffer(S32 access)
 			setBuffer(0);
 			mLocked = TRUE;
 			stop_glerror();	
-			mMappedData = (U8*) glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB);
+
+			U8* src = (U8*) glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB);
+			mMappedData = LL_NEXT_ALIGNED_ADDRESS<U8>(src);
+			mAlignedOffset = mMappedData - src;
+			
 			stop_glerror();
 		}
 		{
 			LLMemType mt_v(LLMemType::MTYPE_VERTEX_MAP_BUFFER_INDICES);
-			mMappedIndexData = (U8*) glMapBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB);
+			U8* src = (U8*) glMapBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB);
+			mMappedIndexData = LL_NEXT_ALIGNED_ADDRESS<U8>(src);
+			mAlignedIndexOffset = mMappedIndexData - src;
+
 			stop_glerror();
 		}
 
@@ -927,6 +1022,45 @@ void LLVertexBuffer::unmapBuffer()
 
 //----------------------------------------------------------------------------
 
+#if LL_ALIGNED_VB
+
+template <class T,S32 type> struct VertexBufferStrider
+{
+	typedef LLStrider<T> strider_t;
+	static bool get(LLVertexBuffer& vbo, 
+					strider_t& strider, 
+					S32 index)
+	{
+		if (vbo.mapBuffer() == NULL)
+		{
+			llwarns << "mapBuffer failed!" << llendl;
+			return FALSE;
+		}
+
+		if (type == LLVertexBuffer::TYPE_INDEX)
+		{
+			S32 stride = sizeof(T);
+			strider = (T*)(vbo.getMappedIndices() + index*stride);
+			strider.setStride(0);
+			return TRUE;
+		}
+		else if (vbo.hasDataType(type))
+		{
+			S32 stride = LLVertexBuffer::sTypeOffsets[type];
+			strider = (T*)(vbo.getMappedData() + vbo.getOffset(type)+index*stride);
+			strider.setStride(stride);
+			return TRUE;
+		}
+		else
+		{
+			llerrs << "VertexBufferStrider could not find valid vertex data." << llendl;
+		}
+		return FALSE;
+	}
+};
+
+#else
+
 template <class T,S32 type> struct VertexBufferStrider
 {
 	typedef LLStrider<T> strider_t;
@@ -962,6 +1096,7 @@ template <class T,S32 type> struct VertexBufferStrider
 	}
 };
 
+#endif
 
 bool LLVertexBuffer::getVertexStrider(LLStrider<LLVector3>& strider, S32 index)
 {
@@ -1003,6 +1138,12 @@ bool LLVertexBuffer::getWeightStrider(LLStrider<F32>& strider, S32 index)
 {
 	return VertexBufferStrider<F32,TYPE_WEIGHT>::get(*this, strider, index);
 }
+
+bool LLVertexBuffer::getWeight4Strider(LLStrider<LLVector4>& strider, S32 index)
+{
+	return VertexBufferStrider<LLVector4,TYPE_WEIGHT4>::get(*this, strider, index);
+}
+
 bool LLVertexBuffer::getClothWeightStrider(LLStrider<LLVector4>& strider, S32 index)
 {
 	return VertexBufferStrider<LLVector4,TYPE_CLOTHWEIGHT>::get(*this, strider, index);
@@ -1177,7 +1318,7 @@ void LLVertexBuffer::setBuffer(U32 data_mask)
 	{		
 		if (mGLBuffer)
 		{
-			if (sEnableVBOs && sVBOActive)
+			if (useVBOs() && sVBOActive)
 			{
 				glBindBufferARB(GL_ARRAY_BUFFER_ARB, 0);
 				sBindCount++;
@@ -1189,7 +1330,7 @@ void LLVertexBuffer::setBuffer(U32 data_mask)
 				setup = TRUE; // ... or a client memory pointer changed
 			}
 		}
-		if (sEnableVBOs && mGLIndices && sIBOActive)
+		if (useVBOs() && mGLIndices && sIBOActive)
 		{
 			/*if (sMapped)
 			{
@@ -1218,6 +1359,81 @@ void LLVertexBuffer::setBuffer(U32 data_mask)
 	}
 }
 
+#if LL_ALIGNED_VB
+
+// virtual (default)
+void LLVertexBuffer::setupVertexBuffer(U32 data_mask) const
+{
+	LLMemType mt2(LLMemType::MTYPE_VERTEX_SETUP_VERTEX_BUFFER);
+	stop_glerror();
+	U8* base = useVBOs() ? (U8*) mAlignedOffset : mMappedData;
+
+	if ((data_mask & mTypeMask) != data_mask)
+	{
+		llerrs << "LLVertexBuffer::setupVertexBuffer missing required components for supplied data mask." << llendl;
+	}
+
+	if (data_mask & MAP_NORMAL)
+	{
+		glNormalPointer(GL_FLOAT, LLVertexBuffer::sTypeOffsets[TYPE_NORMAL], (void*)(base + mOffsets[TYPE_NORMAL]));
+	}
+	if (data_mask & MAP_TEXCOORD3)
+	{
+		glClientActiveTextureARB(GL_TEXTURE3_ARB);
+		glTexCoordPointer(2,GL_FLOAT, LLVertexBuffer::sTypeOffsets[TYPE_TEXCOORD3], (void*)(base + mOffsets[TYPE_TEXCOORD3]));
+		glClientActiveTextureARB(GL_TEXTURE0_ARB);
+	}
+	if (data_mask & MAP_TEXCOORD2)
+	{
+		glClientActiveTextureARB(GL_TEXTURE2_ARB);
+		glTexCoordPointer(2,GL_FLOAT, LLVertexBuffer::sTypeOffsets[TYPE_TEXCOORD2], (void*)(base + mOffsets[TYPE_TEXCOORD2]));
+		glClientActiveTextureARB(GL_TEXTURE0_ARB);
+	}
+	if (data_mask & MAP_TEXCOORD1)
+	{
+		glClientActiveTextureARB(GL_TEXTURE1_ARB);
+		glTexCoordPointer(2,GL_FLOAT, LLVertexBuffer::sTypeOffsets[TYPE_TEXCOORD1], (void*)(base + mOffsets[TYPE_TEXCOORD1]));
+		glClientActiveTextureARB(GL_TEXTURE0_ARB);
+	}
+	if (data_mask & MAP_BINORMAL)
+	{
+		glClientActiveTextureARB(GL_TEXTURE2_ARB);
+		glTexCoordPointer(3,GL_FLOAT, LLVertexBuffer::sTypeOffsets[TYPE_BINORMAL], (void*)(base + mOffsets[TYPE_BINORMAL]));
+		glClientActiveTextureARB(GL_TEXTURE0_ARB);
+	}
+	if (data_mask & MAP_TEXCOORD0)
+	{
+		glTexCoordPointer(2,GL_FLOAT, LLVertexBuffer::sTypeOffsets[TYPE_TEXCOORD0], (void*)(base + mOffsets[TYPE_TEXCOORD0]));
+	}
+	if (data_mask & MAP_COLOR)
+	{
+		glColorPointer(4, GL_UNSIGNED_BYTE, LLVertexBuffer::sTypeOffsets[TYPE_COLOR], (void*)(base + mOffsets[TYPE_COLOR]));
+	}
+	
+	if (data_mask & MAP_WEIGHT)
+	{
+		glVertexAttribPointerARB(1, 1, GL_FLOAT, FALSE, LLVertexBuffer::sTypeOffsets[TYPE_WEIGHT], (void*)(base + mOffsets[TYPE_WEIGHT]));
+	}
+
+	if (data_mask & MAP_WEIGHT4 && sWeight4Loc != -1)
+	{
+		glVertexAttribPointerARB(sWeight4Loc, 4, GL_FLOAT, FALSE, LLVertexBuffer::sTypeOffsets[TYPE_WEIGHT4], (void*)(base+mOffsets[TYPE_WEIGHT4]));
+	}
+
+	if (data_mask & MAP_CLOTHWEIGHT)
+	{
+		glVertexAttribPointerARB(4, 4, GL_FLOAT, TRUE,  LLVertexBuffer::sTypeOffsets[TYPE_CLOTHWEIGHT], (void*)(base + mOffsets[TYPE_CLOTHWEIGHT]));
+	}
+	if (data_mask & MAP_VERTEX)
+	{
+		glVertexPointer(3,GL_FLOAT, LLVertexBuffer::sTypeOffsets[TYPE_VERTEX], (void*)(base + 0));
+	}
+
+	llglassertok();
+}
+
+#else
+
 // virtual (default)
 void LLVertexBuffer::setupVertexBuffer(U32 data_mask) const
 {
@@ -1272,6 +1488,12 @@ void LLVertexBuffer::setupVertexBuffer(U32 data_mask) const
 	{
 		glVertexAttribPointerARB(1, 1, GL_FLOAT, FALSE, stride, (void*)(base + mOffsets[TYPE_WEIGHT]));
 	}
+
+	if (data_mask & MAP_WEIGHT4 && sWeight4Loc != -1)
+	{
+		glVertexAttribPointerARB(sWeight4Loc, 4, GL_FLOAT, FALSE, stride, (void*)(base+mOffsets[TYPE_WEIGHT4]));
+	}
+
 	if (data_mask & MAP_CLOTHWEIGHT)
 	{
 		glVertexAttribPointerARB(4, 4, GL_FLOAT, TRUE,  stride, (void*)(base + mOffsets[TYPE_CLOTHWEIGHT]));
@@ -1284,6 +1506,8 @@ void LLVertexBuffer::setupVertexBuffer(U32 data_mask) const
 	llglassertok();
 }
 
+#endif
+
 void LLVertexBuffer::markDirty(U32 vert_index, U32 vert_count, U32 indices_index, U32 indices_count)
 {
 	// TODO: use GL_APPLE_flush_buffer_range here
diff --git a/indra/llrender/llvertexbuffer.h b/indra/llrender/llvertexbuffer.h
index b785a22976..715309b64a 100644
--- a/indra/llrender/llvertexbuffer.h
+++ b/indra/llrender/llvertexbuffer.h
@@ -79,10 +79,25 @@ protected:
 class LLVertexBuffer : public LLRefCount
 {
 public:
+	LLVertexBuffer(const LLVertexBuffer& rhs)
+	{
+		*this = rhs;
+	}
+
+	const LLVertexBuffer& operator=(const LLVertexBuffer& rhs)
+	{
+		llerrs << "Illegal operation!" << llendl;
+		return *this;
+	}
+
 	static LLVBOPool sStreamVBOPool;
 	static LLVBOPool sDynamicVBOPool;
 	static LLVBOPool sStreamIBOPool;
 	static LLVBOPool sDynamicIBOPool;
+	
+	static S32	sWeight4Loc;
+
+	static BOOL	sUseStreamDraw;
 
 	static void initClass(bool use_vbo);
 	static void cleanupClass();
@@ -94,7 +109,7 @@ public:
 	//if offsets is not NULL, its contents will be filled
 	//with the offset of each vertex component in the buffer, 
 	// indexed by the following enum
-	static S32 calcStride(const U32& typemask, S32* offsets = NULL); 										
+	static S32 calcStride(const U32& typemask, S32* offsets = NULL, S32 num_vertices = 0); 										
 
 	enum {
 		TYPE_VERTEX,
@@ -107,6 +122,7 @@ public:
 		// These use VertexAttribPointer and should possibly be made generic
 		TYPE_BINORMAL,
 		TYPE_WEIGHT,
+		TYPE_WEIGHT4,
 		TYPE_CLOTHWEIGHT,
 		TYPE_MAX,
 		TYPE_INDEX,
@@ -122,6 +138,7 @@ public:
 		// These use VertexAttribPointer and should possibly be made generic
 		MAP_BINORMAL = (1<<TYPE_BINORMAL),
 		MAP_WEIGHT = (1<<TYPE_WEIGHT),
+		MAP_WEIGHT4 = (1<<TYPE_WEIGHT4),
 		MAP_CLOTHWEIGHT = (1<<TYPE_CLOTHWEIGHT),
 	};
 	
@@ -171,6 +188,7 @@ public:
 	bool getBinormalStrider(LLStrider<LLVector3>& strider, S32 index=0);
 	bool getColorStrider(LLStrider<LLColor4U>& strider, S32 index=0);
 	bool getWeightStrider(LLStrider<F32>& strider, S32 index=0);
+	bool getWeight4Strider(LLStrider<LLVector4>& strider, S32 index=0);
 	bool getClothWeightStrider(LLStrider<LLVector4>& strider, S32 index=0);
 	
 	BOOL isEmpty() const					{ return mEmpty; }
@@ -180,12 +198,12 @@ public:
 	S32 getRequestedVerts() const			{ return mRequestedNumVerts; }
 	S32 getRequestedIndices() const			{ return mRequestedNumIndices; }
 
-	U8* getIndicesPointer() const			{ return useVBOs() ? NULL : mMappedIndexData; }
+	U8* getIndicesPointer() const			{ return useVBOs() ? (U8*) mAlignedIndexOffset : mMappedIndexData; }
 	U8* getVerticesPointer() const			{ return useVBOs() ? NULL : mMappedData; }
 	S32 getStride() const					{ return mStride; }
-	S32 getTypeMask() const					{ return mTypeMask; }
+	U32 getTypeMask() const					{ return mTypeMask; }
 	BOOL hasDataType(S32 type) const		{ return ((1 << type) & getTypeMask()) ? TRUE : FALSE; }
-	S32 getSize() const						{ return mNumVerts*mStride; }
+	S32 getSize() const;
 	S32 getIndicesSize() const				{ return mNumIndices * sizeof(U16); }
 	U8* getMappedData() const				{ return mMappedData; }
 	U8* getMappedIndices() const			{ return mMappedIndexData; }
@@ -200,12 +218,19 @@ public:
 	void drawArrays(U32 mode, U32 offset, U32 count) const;
 	void drawRange(U32 mode, U32 start, U32 end, U32 count, U32 indices_offset) const;
 
+	//for debugging, validate data in given range is valid
+	void validateRange(U32 start, U32 end, U32 count, U32 offset) const;
+
+	
+
 protected:	
 	S32		mNumVerts;		// Number of vertices allocated
 	S32		mNumIndices;	// Number of indices allocated
 	S32		mRequestedNumVerts;  // Number of vertices requested
 	S32		mRequestedNumIndices;  // Number of indices requested
 
+	ptrdiff_t mAlignedOffset;
+	ptrdiff_t mAlignedIndexOffset;
 	S32		mStride;
 	U32		mTypeMask;
 	S32		mUsage;			// GL usage
@@ -220,7 +245,7 @@ protected:
 	S32		mOffsets[TYPE_MAX];
 	BOOL	mResized;		// if TRUE, client buffer has been resized and GL buffer has not
 	BOOL	mDynamicSize;	// if TRUE, buffer has been resized at least once (and should be padded)
-
+	
 	class DirtyRegion
 	{
 	public: