4 files changed, 27 insertions, 7 deletions
diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index 9967c23ce8..5429489075 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -445,7 +445,9 @@ LLGLManager::LLGLManager() :
 	mIsGFFX(FALSE),
 	mATIOffsetVerticalLines(FALSE),
 	mATIOldDriver(FALSE),
-
+#if LL_DARWIN
+	mIsMobileGF(FALSE),
+#endif
 	mHasRequirements(TRUE),
 
 	mHasSeparateSpecularColor(FALSE),
@@ -637,6 +639,13 @@ bool LLGLManager::initGL()
 		{
 			mIsGF3 = TRUE;
 		}
+#if LL_DARWIN
+		else if ((mGLRenderer.find("9400M") != std::string::npos)
+			  || (mGLRenderer.find("9600M") != std::string::npos))
+		{
+			mIsMobileGF = TRUE;
+		}
+#endif
 
 	}
 	else if (mGLVendor.find("INTEL") != std::string::npos
diff --git a/indra/llrender/llgl.h b/indra/llrender/llgl.h
index 1e921d1e97..767d49cbf2 100644
--- a/indra/llrender/llgl.h
+++ b/indra/llrender/llgl.h
@@ -128,6 +128,11 @@ public:
 	BOOL mATIOffsetVerticalLines;
 	BOOL mATIOldDriver;
 
+#if LL_DARWIN
+	// Needed to distinguish problem cards on older Macs that break with Materials
+	BOOL mIsMobileGF;
+#endif
+	
 	// Whether this version of GL is good enough for SL to use
 	BOOL mHasRequirements;
 
diff --git a/indra/newview/llviewershadermgr.cpp b/indra/newview/llviewershadermgr.cpp
index 286152867f..ce066d85f1 100644
--- a/indra/newview/llviewershadermgr.cpp
+++ b/indra/newview/llviewershadermgr.cpp
@@ -783,9 +783,6 @@ BOOL LLViewerShaderMgr::loadBasicShaders()
 	// Load basic dependency shaders first
 	// All of these have to load for any shaders to function
 	
-#if LL_DARWIN // Mac can't currently handle all 8 lights, 
-	S32 sum_lights_class = 2;
-#else 
 	S32 sum_lights_class = 3;
 
 	// class one cards will get the lower sum lights
@@ -796,14 +793,21 @@ BOOL LLViewerShaderMgr::loadBasicShaders()
 	{
 		sum_lights_class = 2;
 	}
-#endif
 
 	// If we have sun and moon only checked, then only sum those lights.
 	if (gPipeline.getLightingDetail() == 0)
 	{
 		sum_lights_class = 1;
 	}
-
+	
+#if LL_DARWIN
+	// Work around driver crashes on older Macs when using deferred rendering
+	// NORSPEC-59
+	//
+	if (gGLManager.mIsMobileGF)
+		sum_lights_class = 3;
+#endif
+	
 	// Use the feature table to mask out the max light level to use.  Also make sure it's at least 1.
 	S32 max_light_class = gSavedSettings.getS32("RenderShaderLightingMaxLevel");
 	sum_lights_class = llclamp(sum_lights_class, 1, max_light_class);
diff --git a/indra/newview/llvoavatar.cpp b/indra/newview/llvoavatar.cpp
index a3093f069d..9d16c28e2f 100644
--- a/indra/newview/llvoavatar.cpp
+++ b/indra/newview/llvoavatar.cpp
@@ -4336,6 +4336,7 @@ U32 LLVOAvatar::renderTransparent(BOOL first_pass)
 		gGL.setAlphaRejectSettings(LLRender::CF_DEFAULT);
 	}
 
+#if !LL_DARWIN
 	if (!isSelf() || gAgent.needsRenderHead() || LLPipeline::sShadowRender)
 	{
 		if (LLPipeline::sImpostorRender)
@@ -4362,7 +4363,8 @@ U32 LLVOAvatar::renderTransparent(BOOL first_pass)
 			gGL.setAlphaRejectSettings(LLRender::CF_DEFAULT);
 		}
 	}
-
+#endif
+	
 	return num_indices;
 }