5 files changed, 27 insertions, 5 deletions
diff --git a/indra/llrender/llglslshader.cpp b/indra/llrender/llglslshader.cpp
index b12de563e4..04ac2476a7 100644
--- a/indra/llrender/llglslshader.cpp
+++ b/indra/llrender/llglslshader.cpp
@@ -1085,7 +1085,7 @@ S32 LLGLSLShader::bindTexture(S32 uniform, LLTexture* texture, LLTexUnit::eTextu
     return uniform;
 }
 
-S32 LLGLSLShader::bindTexture(S32 uniform, LLRenderTarget* texture, bool depth, LLTexUnit::eTextureFilterOptions mode)
+S32 LLGLSLShader::bindTexture(S32 uniform, LLRenderTarget* texture, bool depth, LLTexUnit::eTextureFilterOptions mode, U32 index)
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_SHADER;
 
@@ -1103,7 +1103,7 @@ S32 LLGLSLShader::bindTexture(S32 uniform, LLRenderTarget* texture, bool depth,
         }
         else {
             bool has_mips = mode == LLTexUnit::TFO_TRILINEAR || mode == LLTexUnit::TFO_ANISOTROPIC;
-            gGL.getTexUnit(uniform)->bindManual(texture->getUsage(), texture->getTexture(0), has_mips);
+            gGL.getTexUnit(uniform)->bindManual(texture->getUsage(), texture->getTexture(index), has_mips);
         }
 
         gGL.getTexUnit(uniform)->setTextureFilteringOption(mode);
diff --git a/indra/llrender/llglslshader.h b/indra/llrender/llglslshader.h
index 37f86acd4e..9d187c972c 100644
--- a/indra/llrender/llglslshader.h
+++ b/indra/llrender/llglslshader.h
@@ -244,7 +244,7 @@ public:
     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, 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);
+    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);
     S32 unbindTexture(S32 uniform, LLTexUnit::eTextureType mode = LLTexUnit::TT_TEXTURE);
 
diff --git a/indra/llrender/llrender.h b/indra/llrender/llrender.h
index 6f61627235..909a1de2b3 100644
--- a/indra/llrender/llrender.h
+++ b/indra/llrender/llrender.h
@@ -87,6 +87,13 @@ public:
 		TFO_ANISOTROPIC			// Equal to: min=anisotropic, max=anisotropic, mip=linear.
 	} eTextureFilterOptions;
 
+	typedef enum
+	{
+		TMG_NONE = 0,			// Mipmaps are not automatically generated for this texture.
+		TMG_AUTO,				// Mipmaps are automatically generated for this texture.
+		TMG_MANUAL				// Mipmaps are manually generated for this texture.
+	} eTextureMipGeneration;
+
 	typedef enum 
 	{
 		TB_REPLACE = 0,
diff --git a/indra/llrender/llrendertarget.cpp b/indra/llrender/llrendertarget.cpp
index 7f507a0b58..629664b76d 100644
--- a/indra/llrender/llrendertarget.cpp
+++ b/indra/llrender/llrendertarget.cpp
@@ -102,7 +102,7 @@ void LLRenderTarget::resize(U32 resx, U32 resy)
 }
     
 
-bool LLRenderTarget::allocate(U32 resx, U32 resy, U32 color_fmt, bool depth, LLTexUnit::eTextureType usage)
+bool LLRenderTarget::allocate(U32 resx, U32 resy, U32 color_fmt, bool depth, LLTexUnit::eTextureType usage, LLTexUnit::eTextureMipGeneration generateMipMaps)
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_DISPLAY;
     llassert(usage == LLTexUnit::TT_TEXTURE);
@@ -118,6 +118,13 @@ bool LLRenderTarget::allocate(U32 resx, U32 resy, U32 color_fmt, bool depth, LLT
 
     mUsage = usage;
     mUseDepth = depth;
+
+    mGenerateMipMaps = generateMipMaps;
+
+    if (mGenerateMipMaps != LLTexUnit::TMG_NONE) {
+        // Calculate the number of mip levels based upon resolution that we should have.
+        mMipLevels = 1 + floor(log10((float)llmax(mResX, mResY))/log10(2.0));
+    }
     
     if (depth)
     {
@@ -512,6 +519,12 @@ void LLRenderTarget::flush()
     llassert(sCurFBO == mFBO);
     llassert(sBoundTarget == this);
 
+    if (mGenerateMipMaps == LLTexUnit::TMG_AUTO) {
+        LL_PROFILE_GPU_ZONE("rt generate mipmaps");
+        bindTexture(0, 0, LLTexUnit::TFO_TRILINEAR);
+        glGenerateMipmap(GL_TEXTURE_2D);
+    }
+
     if (mPreviousRT)
     {
         // a bit hacky -- pop the RT stack back two frames and push
diff --git a/indra/llrender/llrendertarget.h b/indra/llrender/llrendertarget.h
index 71727bf09d..9fcea35e3d 100644
--- a/indra/llrender/llrendertarget.h
+++ b/indra/llrender/llrendertarget.h
@@ -80,7 +80,7 @@ public:
     // color_fmt - GL color format (e.g. GL_RGB)
     // depth - if true, allocate a depth buffer
     // usage - deprecated, should always be TT_TEXTURE
-	bool allocate(U32 resx, U32 resy, U32 color_fmt, bool depth = false, LLTexUnit::eTextureType usage = LLTexUnit::TT_TEXTURE);
+	bool allocate(U32 resx, U32 resy, U32 color_fmt, bool depth = false, LLTexUnit::eTextureType usage = LLTexUnit::TT_TEXTURE, LLTexUnit::eTextureMipGeneration generateMipMaps = LLTexUnit::TMG_NONE);
 
 	//resize existing attachments to use new resolution and color format
 	// CAUTION: if the GL runs out of memory attempting to resize, this render target will be undefined
@@ -179,6 +179,8 @@ protected:
 
     U32 mDepth;
     bool mUseDepth;
+	LLTexUnit::eTextureMipGeneration mGenerateMipMaps;
+	U32 mMipLevels;
 
 	LLTexUnit::eTextureType mUsage;