From dbb353d3b0e5cf3aa9d4d8062c527bb52171ef15 Mon Sep 17 00:00:00 2001
From: Xiaohong Bao <bao@lindenlab.com>
Date: Fri, 21 Oct 2011 11:53:29 -0600
Subject: fix for SH-2516: Full Bright Geometry Rendering Increases Rapidly,
 Destroying Frame Rate.

---
 indra/newview/llappviewer.cpp         |  2 ++
 indra/newview/llviewertexture.cpp     | 47 +++++++++++++++++++++++++++++++++++
 indra/newview/llviewertexture.h       |  1 +
 indra/newview/llviewertexturelist.cpp |  7 ++++++
 4 files changed, 57 insertions(+)

diff --git a/indra/newview/llappviewer.cpp b/indra/newview/llappviewer.cpp
index 4e1ef59765..152ee34bbc 100644
--- a/indra/newview/llappviewer.cpp
+++ b/indra/newview/llappviewer.cpp
@@ -3160,6 +3160,8 @@ void LLAppViewer::handleViewerCrash()
 
 	llinfos << "Last render pool type: " << LLPipeline::sCurRenderPoolType << llendl ;
 
+	LLMemory::logMemoryInfo(true) ;
+
 	//print out recorded call stacks if there are any.
 	LLError::LLCallStacks::print();
 
diff --git a/indra/newview/llviewertexture.cpp b/indra/newview/llviewertexture.cpp
index 280337be0f..786e2b73b1 100644
--- a/indra/newview/llviewertexture.cpp
+++ b/indra/newview/llviewertexture.cpp
@@ -417,6 +417,48 @@ const S32 min_non_tex_system_mem = (128<<20); // 128 MB
 F32 texmem_lower_bound_scale = 0.85f;
 F32 texmem_middle_bound_scale = 0.925f;
 
+//static 
+bool LLViewerTexture::isMemoryForTextureLow()
+{
+	const static S32 MIN_FREE_TEXTURE_MEMORY = 5 ; //MB
+	const static S32 MIN_FREE_MAIN_MEMORy = 100 ; //MB
+
+	bool low_mem = false ;
+	if (gGLManager.mHasATIMemInfo)
+	{
+		S32 meminfo[4];
+		glGetIntegerv(GL_TEXTURE_FREE_MEMORY_ATI, meminfo);
+
+		if(meminfo[0] / 1024 < MIN_FREE_TEXTURE_MEMORY)
+		{
+			low_mem = true ;
+		}
+	}
+#if 0  //ignore nVidia cards
+	else if (gGLManager.mHasNVXMemInfo)
+	{
+		S32 free_memory;
+		glGetIntegerv(GL_GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX, &free_memory);
+		
+		if(free_memory / 1024 < MIN_FREE_TEXTURE_MEMORY)
+		{
+			low_mem = true ;
+		}
+	}
+#endif
+
+	if(!low_mem) //check main memory, only works for windows.
+	{
+		LLMemory::updateMemoryInfo() ;
+		if(LLMemory::getAvailableMemKB() / 1024 < MIN_FREE_MAIN_MEMORy)
+		{
+			low_mem = true ;
+		}
+	}
+
+	return low_mem ;
+}
+
 //static
 void LLViewerTexture::updateClass(const F32 velocity, const F32 angular_velocity)
 {
@@ -449,6 +491,11 @@ void LLViewerTexture::updateClass(const F32 velocity, const F32 angular_velocity
 			sEvaluationTimer.reset();
 		}
 	}
+	else if(sEvaluationTimer.getElapsedTimeF32() > discard_delta_time && isMemoryForTextureLow())
+	{
+		sDesiredDiscardBias += discard_bias_delta;
+		sEvaluationTimer.reset();
+	}
 	else if (sDesiredDiscardBias > 0.0f &&
 			 BYTES_TO_MEGA_BYTES(sBoundTextureMemoryInBytes) < sMaxBoundTextureMemInMegaBytes * texmem_lower_bound_scale &&
 			 BYTES_TO_MEGA_BYTES(sTotalTextureMemoryInBytes) < sMaxTotalTextureMemInMegaBytes * texmem_lower_bound_scale)
diff --git a/indra/newview/llviewertexture.h b/indra/newview/llviewertexture.h
index a4a5ae0a5b..b96441127d 100644
--- a/indra/newview/llviewertexture.h
+++ b/indra/newview/llviewertexture.h
@@ -267,6 +267,7 @@ private:
 	/*virtual*/ LLImageGL* getGLTexture() const ;
 	virtual void switchToCachedImage();
 	
+	static bool isMemoryForTextureLow() ;
 protected:
 	LLUUID mID;
 	S32 mBoostLevel;				// enum describing priority level
diff --git a/indra/newview/llviewertexturelist.cpp b/indra/newview/llviewertexturelist.cpp
index 30ef8b8a29..92d2762ef3 100644
--- a/indra/newview/llviewertexturelist.cpp
+++ b/indra/newview/llviewertexturelist.cpp
@@ -1053,6 +1053,13 @@ S32 LLViewerTextureList::getMaxVideoRamSetting(bool get_recommended)
 		// Treat any card with < 32 MB (shudder) as having 32 MB
 		//  - it's going to be swapping constantly regardless
 		S32 max_vram = gGLManager.mVRAM;
+
+		if(gGLManager.mIsATI)
+		{
+			//shrink the availabe vram for ATI cards because some of them do not handel texture swapping well.
+			max_vram *= 0.75f;  
+		}
+
 		max_vram = llmax(max_vram, getMinVideoRamSetting());
 		max_texmem = max_vram;
 		if (!get_recommended)
-- 
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