From ce504224de16776ade2a01adfbd5410fae6942cc Mon Sep 17 00:00:00 2001
From: Dave Parks <davep@lindenlab.com>
Date: Sat, 6 Feb 2010 20:50:49 -0600
Subject: Fix for bad GL blend function caching.

---
 indra/llrender/llrender.cpp | 33 ++++++++++++++++-----------------
 indra/llrender/llrender.h   |  3 ++-
 2 files changed, 18 insertions(+), 18 deletions(-)

(limited to 'indra/llrender')

diff --git a/indra/llrender/llrender.cpp b/indra/llrender/llrender.cpp
index d2dc1104a8..c11675fa48 100644
--- a/indra/llrender/llrender.cpp
+++ b/indra/llrender/llrender.cpp
@@ -763,7 +763,8 @@ LLRender::LLRender()
 
 	mCurrAlphaFunc = CF_DEFAULT;
 	mCurrAlphaFuncVal = 0.01f;
-	mCurrSceneBlendType = BT_ALPHA;
+	mCurrBlendSFactor = BF_SOURCE_ALPHA;
+	mCurrBlendDFactor = BF_ONE_MINUS_SOURCE_ALPHA;
 }
 
 LLRender::~LLRender()
@@ -922,40 +923,33 @@ void LLRender::setColorMask(bool writeColorR, bool writeColorG, bool writeColorB
 
 void LLRender::setSceneBlendType(eBlendType type)
 {
-	if (mCurrSceneBlendType == type)
-	{
-		return;
-	}
-
-	flush();
 	switch (type) 
 	{
 		case BT_ALPHA:
-			glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+			blendFunc(BF_SOURCE_ALPHA, BF_ONE_MINUS_SOURCE_ALPHA);
 			break;
 		case BT_ADD:
-			glBlendFunc(GL_ONE, GL_ONE);
+			blendFunc(BF_ONE, BF_ONE);
 			break;
 		case BT_ADD_WITH_ALPHA:
-			glBlendFunc(GL_SRC_ALPHA, GL_ONE);
+			blendFunc(BF_SOURCE_ALPHA, BF_ONE);
 			break;
 		case BT_MULT:
-			glBlendFunc(GL_DST_COLOR, GL_ZERO);
+			blendFunc(BF_DEST_COLOR, BF_ZERO);
 			break;
 		case BT_MULT_ALPHA:
-			glBlendFunc(GL_DST_ALPHA, GL_ZERO);
+			blendFunc(BF_DEST_ALPHA, BF_ZERO);
 			break;
 		case BT_MULT_X2:
-			glBlendFunc(GL_DST_COLOR, GL_SRC_COLOR);
+			blendFunc(BF_DEST_COLOR, BF_SOURCE_COLOR);
 			break;
 		case BT_REPLACE:
-			glBlendFunc(GL_ONE, GL_ZERO);
+			blendFunc(BF_ONE, BF_ZERO);
 			break;
 		default:
 			llerrs << "Unknown Scene Blend Type: " << type << llendl;
 			break;
 	}
-	mCurrSceneBlendType = type;
 }
 
 void LLRender::setAlphaRejectSettings(eCompareFunc func, F32 value)
@@ -976,8 +970,13 @@ void LLRender::setAlphaRejectSettings(eCompareFunc func, F32 value)
 
 void LLRender::blendFunc(eBlendFactor sfactor, eBlendFactor dfactor)
 {
-	flush();
-	glBlendFunc(sGLBlendFactor[sfactor], sGLBlendFactor[dfactor]);
+	if (mCurrBlendSFactor != sfactor || mCurrBlendDFactor != dfactor)
+	{
+		mCurrBlendSFactor = sfactor;
+		mCurrBlendDFactor = dfactor;
+		flush();
+		glBlendFunc(sGLBlendFactor[sfactor], sGLBlendFactor[dfactor]);
+	}
 }
 
 LLTexUnit* LLRender::getTexUnit(U32 index)
diff --git a/indra/llrender/llrender.h b/indra/llrender/llrender.h
index 6e38fac67b..a70ccf4d80 100644
--- a/indra/llrender/llrender.h
+++ b/indra/llrender/llrender.h
@@ -360,7 +360,8 @@ private:
 	std::vector<LLTexUnit*>		mTexUnits;
 	LLTexUnit*			mDummyTexUnit;
 
-	U32				mCurrSceneBlendType;
+	U32				mCurrBlendSFactor;
+	U32				mCurrBlendDFactor;
 
 	F32				mMaxAnisotropy;
 
-- 
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