Huge renderer update (WIP). Still plenty to do, especially pertaining to UI.

-Nametag bubble visbility is oddly inconsistent. May vanish with future planned UI merges...
-VBOs are PAINFULLY slow on ATI hardware. This repos self-compiled davep/shining-fixes branch, so I'll leave the ball in LL's court for now regarding that.

indra/newview/llfeaturemanager.cpp

@@ -56,6 +56,7 @@
 #include "llcontrol.h"
 #include "llboost.h"
 #include "llweb.h"
+#include "llviewershadermgr.h"
 
 #if LL_WINDOWS
 #include "lldxhardware.h"
@@ -110,7 +111,7 @@ BOOL LLFeatureList::isFeatureAvailable(const std::string& name)
 		return mFeatures[name].mAvailable;
 	}
 
-	LL_WARNS("RenderInit") << "Feature " << name << " not on feature list!" << LL_ENDL;
+	LL_WARNS_ONCE("RenderInit") << "Feature " << name << " not on feature list!" << LL_ENDL;
 	
 	// changing this to TRUE so you have to explicitly disable 
 	// something for it to be disabled
@@ -124,7 +125,7 @@ F32 LLFeatureList::getRecommendedValue(const std::string& name)
 		return mFeatures[name].mRecommendedLevel;
 	}
 
-	LL_WARNS("RenderInit") << "Feature " << name << " not on feature list or not available!" << LL_ENDL;
+	LL_WARNS_ONCE("RenderInit") << "Feature " << name << " not on feature list or not available!" << LL_ENDL;
 	return 0;
 }
 
@@ -528,6 +529,8 @@ void LLFeatureManager::applyFeatures(bool skipFeatures)
 
 void LLFeatureManager::setGraphicsLevel(S32 level, bool skipFeatures)
 {
+	LLViewerShaderMgr::sSkipReload = true;
+
 	applyBaseMasks();
 
 	switch (level)
@@ -550,6 +553,9 @@ void LLFeatureManager::setGraphicsLevel(S32 level, bool skipFeatures)
 	}
 
 	applyFeatures(skipFeatures);
+
+	LLViewerShaderMgr::sSkipReload = false;
+	LLViewerShaderMgr::instance()->setShaders();
 }
 
 void LLFeatureManager::applyBaseMasks()
@@ -591,7 +597,7 @@ void LLFeatureManager::applyBaseMasks()
 	{
 		maskFeatures("NoPixelShaders");
 	}
-	if (!gGLManager.mHasVertexShader)
+	if (!gGLManager.mHasVertexShader || !mGPUSupported)
 	{
 		maskFeatures("NoVertexShaders");
 	}
@@ -635,6 +641,10 @@ void LLFeatureManager::applyBaseMasks()
 	{
 		maskFeatures("TexUnit8orLess");
 	}
+	if (gGLManager.mHasMapBufferRange)
+	{
+		maskFeatures("MapBufferRange");
+	}
 
 	// now mask by gpu string
 	// Replaces ' ' with '_' in mGPUString to deal with inability for parser to handle spaces