4 files changed, 50 insertions, 1 deletions
diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index 9354373dba..d5f0b81830 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -313,6 +313,8 @@ LLGLManager::LLGLManager() :
 	mIsDisabled(FALSE),
 
 	mHasMultitexture(FALSE),
+	mHasATIMemInfo(FALSE),
+	mHasNVXMemInfo(FALSE),
 	mNumTextureUnits(1),
 	mHasMipMapGeneration(FALSE),
 	mHasCompressedTextures(FALSE),
@@ -497,6 +499,20 @@ bool LLGLManager::initGL()
 	// This is called here because it depends on the setting of mIsGF2or4MX, and sets up mHasMultitexture.
 	initExtensions();
 
+	if (mHasATIMemInfo)
+	{ //ask the gl how much vram is free at startup and attempt to use no more than half of that
+		S32 meminfo[4];
+		glGetIntegerv(GL_TEXTURE_FREE_MEMORY_ATI, meminfo);
+
+		mVRAM = meminfo[0]/1024;
+	}
+	else if (mHasNVXMemInfo)
+	{
+		S32 dedicated_memory;
+		glGetIntegerv(GL_GPU_MEMORY_INFO_DEDICATED_VIDMEM_NVX, &dedicated_memory);
+		mVRAM = dedicated_memory/1024;
+	}
+
 	if (mHasMultitexture)
 	{
 		GLint num_tex_units;		
@@ -659,6 +675,8 @@ void LLGLManager::initExtensions()
 	mHasTextureRectangle = FALSE;
 #else // LL_MESA_HEADLESS
 	mHasMultitexture = glh_init_extensions("GL_ARB_multitexture");
+	mHasATIMemInfo = ExtensionExists("GL_ATI_meminfo", gGLHExts.mSysExts);
+	mHasNVXMemInfo = ExtensionExists("GL_NVX_gpu_memory_info", gGLHExts.mSysExts);
 	mHasMipMapGeneration = glh_init_extensions("GL_SGIS_generate_mipmap");
 	mHasSeparateSpecularColor = glh_init_extensions("GL_EXT_separate_specular_color");
 	mHasAnisotropic = glh_init_extensions("GL_EXT_texture_filter_anisotropic");
diff --git a/indra/llrender/llgl.h b/indra/llrender/llgl.h
index df110613e3..0d7ba15b12 100644
--- a/indra/llrender/llgl.h
+++ b/indra/llrender/llgl.h
@@ -76,6 +76,8 @@ public:
 
 	// Extensions used by everyone
 	BOOL mHasMultitexture;
+	BOOL mHasATIMemInfo;
+	BOOL mHasNVXMemInfo;
 	S32	 mNumTextureUnits;
 	BOOL mHasMipMapGeneration;
 	BOOL mHasCompressedTextures;
diff --git a/indra/llrender/llglheaders.h b/indra/llrender/llglheaders.h
index 46bc282436..c48e2bb5fa 100644
--- a/indra/llrender/llglheaders.h
+++ b/indra/llrender/llglheaders.h
@@ -837,4 +837,22 @@ extern void glGetBufferPointervARB (GLenum, GLenum, GLvoid* *);
 #define GL_DEPTH_CLAMP 0x864F
 #endif
 
+//GL_NVX_gpu_memory_info constants
+#ifndef GL_NVX_gpu_memory_info
+#define GL_NVX_gpu_memory_info
+#define	GL_GPU_MEMORY_INFO_DEDICATED_VIDMEM_NVX          0x9047
+#define	GL_GPU_MEMORY_INFO_TOTAL_AVAILABLE_MEMORY_NVX    0x9048
+#define	GL_GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX  0x9049
+#define	GL_GPU_MEMORY_INFO_EVICTION_COUNT_NVX            0x904A
+#define	GL_GPU_MEMORY_INFO_EVICTED_MEMORY_NVX            0x904B
+#endif
+
+//GL_ATI_meminfo constants
+#ifndef GL_ATI_meminfo
+#define GL_ATI_meminfo
+#define GL_VBO_FREE_MEMORY_ATI                     0x87FB
+#define GL_TEXTURE_FREE_MEMORY_ATI                 0x87FC
+#define GL_RENDERBUFFER_FREE_MEMORY_ATI            0x87FD
+#endif
+
 #endif // LL_LLGLHEADERS_H
diff --git a/indra/llrender/llvertexbuffer.cpp b/indra/llrender/llvertexbuffer.cpp
index 378147eadc..0d3f5b81bc 100644
--- a/indra/llrender/llvertexbuffer.cpp
+++ b/indra/llrender/llvertexbuffer.cpp
@@ -354,7 +354,18 @@ void LLVertexBuffer::drawArrays(U32 mode, U32 first, U32 count) const
 //static
 void LLVertexBuffer::initClass(bool use_vbo, bool no_vbo_mapping)
 {
-	sEnableVBOs = use_vbo;
+	sEnableVBOs = use_vbo && gGLManager.mHasVertexBufferObject ;
+	if(sEnableVBOs)
+	{
+		//llassert_always(glBindBufferARB) ; //double check the extention for VBO is loaded.
+
+		llinfos << "VBO is enabled." << llendl ;
+	}
+	else
+	{
+		llinfos << "VBO is disabled." << llendl ;
+	}
+
 	sDisableVBOMapping = sEnableVBOs && no_vbo_mapping ;
 	LLGLNamePool::registerPool(&sDynamicVBOPool);
 	LLGLNamePool::registerPool(&sDynamicIBOPool);