From 8ec39da3468f53af85d0cd4d4d9c54a72d6b8152 Mon Sep 17 00:00:00 2001
From: Dave Parks <davep@lindenlab.com>
Date: Fri, 29 Jul 2011 17:46:16 -0500
Subject: SH-2181 Fix for alpha flickering when basic shaders enabled (don't
 use glAlphaFunc when shaders are available).

Reviewed by Leslie
---
 indra/llrender/llrender.cpp | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'indra/llrender/llrender.cpp')

diff --git a/indra/llrender/llrender.cpp b/indra/llrender/llrender.cpp
index 70df1dd1d1..d72918b15d 100644
--- a/indra/llrender/llrender.cpp
+++ b/indra/llrender/llrender.cpp
@@ -1168,6 +1168,11 @@ void LLRender::setAlphaRejectSettings(eCompareFunc func, F32 value)
 {
 	flush();
 
+	if (LLGLSLShader::sNoFixedFunction)
+	{ //glAlphaFunc is deprecated in OpenGL 3.3
+		return;
+	}
+
 	if (mCurrAlphaFunc != func ||
 		mCurrAlphaFuncVal != value)
 	{
@@ -1182,6 +1187,30 @@ void LLRender::setAlphaRejectSettings(eCompareFunc func, F32 value)
 			glAlphaFunc(sGLCompareFunc[func], value);
 		}
 	}
+
+	if (gDebugGL)
+	{ //make sure cached state is correct
+		GLint cur_func = 0;
+		glGetIntegerv(GL_ALPHA_TEST_FUNC, &cur_func);
+
+		if (func == CF_DEFAULT)
+		{
+			func = CF_GREATER;
+		}
+
+		if (cur_func != sGLCompareFunc[func])
+		{
+			llerrs << "Alpha test function corrupted!" << llendl;
+		}
+
+		F32 ref = 0.f;
+		glGetFloatv(GL_ALPHA_TEST_REF, &ref);
+
+		if (ref != value)
+		{
+			llerrs << "Alpha test value corrupted!" << llendl;
+		}
+	}
 }
 
 void LLRender::blendFunc(eBlendFactor sfactor, eBlendFactor dfactor)
-- 
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