From a43a762c0ddf3ecac2056b36d0ede1f99e71231e Mon Sep 17 00:00:00 2001
From: Graham Linden <graham@lindenlab.com>
Date: Mon, 12 Aug 2013 17:22:47 -0700
Subject: NORSPEC-342 fix blocky hair in ALM from writing depth for transparent
 pixels in impostor rendering

---
 indra/newview/lldrawpoolalpha.cpp   |  8 +++++++-
 indra/newview/lldrawpoolsimple.cpp  |  6 +++++-
 indra/newview/llviewershadermgr.cpp | 25 +++++++++++++++++++++++++
 indra/newview/llviewershadermgr.h   |  1 +
 4 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/indra/newview/lldrawpoolalpha.cpp b/indra/newview/lldrawpoolalpha.cpp
index a8010d17d6..5ebc58fb7d 100755
--- a/indra/newview/lldrawpoolalpha.cpp
+++ b/indra/newview/lldrawpoolalpha.cpp
@@ -181,7 +181,13 @@ void LLDrawPoolAlpha::beginRenderPass(S32 pass)
 {
 	LLFastTimer t(FTM_RENDER_ALPHA);
 	
-	if (LLPipeline::sUnderWaterRender)
+	if (LLPipeline::sImpostorRender)
+	{
+		simple_shader = &gObjectSimpleImpostorProgram;
+		fullbright_shader = &gObjectFullbrightProgram;
+		emissive_shader = &gObjectEmissiveProgram;
+	}
+	else if (LLPipeline::sUnderWaterRender)
 	{
 		simple_shader = &gObjectSimpleWaterProgram;
 		fullbright_shader = &gObjectFullbrightWaterProgram;
diff --git a/indra/newview/lldrawpoolsimple.cpp b/indra/newview/lldrawpoolsimple.cpp
index aee9d19d19..8926f64c64 100755
--- a/indra/newview/lldrawpoolsimple.cpp
+++ b/indra/newview/lldrawpoolsimple.cpp
@@ -156,7 +156,11 @@ void LLDrawPoolSimple::beginRenderPass(S32 pass)
 {
 	LLFastTimer t(FTM_RENDER_SIMPLE);
 
-	if (LLPipeline::sUnderWaterRender)
+	if (LLPipeline::sImpostorRender)
+	{
+		simple_shader = &gObjectSimpleImpostorProgram;
+	}
+	else if (LLPipeline::sUnderWaterRender)
 	{
 		simple_shader = &gObjectSimpleWaterProgram;
 	}
diff --git a/indra/newview/llviewershadermgr.cpp b/indra/newview/llviewershadermgr.cpp
index b2f7949388..995eb599b8 100755
--- a/indra/newview/llviewershadermgr.cpp
+++ b/indra/newview/llviewershadermgr.cpp
@@ -83,6 +83,7 @@ LLGLSLShader	gAlphaMaskProgram;
 
 //object shaders
 LLGLSLShader		gObjectSimpleProgram;
+LLGLSLShader		gObjectSimpleImpostorProgram;
 LLGLSLShader		gObjectPreviewProgram;
 LLGLSLShader		gObjectSimpleWaterProgram;
 LLGLSLShader		gObjectSimpleAlphaMaskProgram;
@@ -237,6 +238,7 @@ LLViewerShaderMgr::LLViewerShaderMgr() :
 	mShaderList.push_back(&gWaterProgram);
 	mShaderList.push_back(&gAvatarEyeballProgram); 
 	mShaderList.push_back(&gObjectSimpleProgram);
+	mShaderList.push_back(&gObjectSimpleImpostorProgram);
 	mShaderList.push_back(&gObjectPreviewProgram);
 	mShaderList.push_back(&gImpostorProgram);
 	mShaderList.push_back(&gObjectFullbrightNoColorProgram);
@@ -729,6 +731,7 @@ void LLViewerShaderMgr::unloadShaders()
 	gObjectFullbrightNoColorProgram.unload();
 	gObjectFullbrightNoColorWaterProgram.unload();
 	gObjectSimpleProgram.unload();
+	gObjectSimpleImpostorProgram.unload();
 	gObjectPreviewProgram.unload();
 	gImpostorProgram.unload();
 	gObjectSimpleAlphaMaskProgram.unload();
@@ -2020,6 +2023,7 @@ BOOL LLViewerShaderMgr::loadShadersObject()
 		gObjectFullbrightNoColorProgram.unload();
 		gObjectFullbrightNoColorWaterProgram.unload();
 		gObjectSimpleProgram.unload();
+		gObjectSimpleImpostorProgram.unload();
 		gObjectPreviewProgram.unload();
 		gImpostorProgram.unload();
 		gObjectSimpleAlphaMaskProgram.unload();
@@ -2440,6 +2444,27 @@ BOOL LLViewerShaderMgr::loadShadersObject()
 		success = gObjectSimpleProgram.createShader(NULL, NULL);
 	}
 
+	if (success)
+	{
+		gObjectSimpleImpostorProgram.mName = "Simple Impostor Shader";
+		gObjectSimpleImpostorProgram.mFeatures.calculatesLighting = true;
+		gObjectSimpleImpostorProgram.mFeatures.calculatesAtmospherics = true;
+		gObjectSimpleImpostorProgram.mFeatures.hasGamma = true;
+		gObjectSimpleImpostorProgram.mFeatures.hasAtmospherics = true;
+		gObjectSimpleImpostorProgram.mFeatures.hasLighting = true;
+		gObjectSimpleImpostorProgram.mFeatures.mIndexedTextureChannels = 0;
+		// force alpha mask version of lighting so we can weed out
+		// transparent pixels from impostor temp buffer
+		//
+		gObjectSimpleImpostorProgram.mFeatures.hasAlphaMask = true; 
+		gObjectSimpleImpostorProgram.mShaderFiles.clear();
+		gObjectSimpleImpostorProgram.mShaderFiles.push_back(make_pair("objects/simpleV.glsl", GL_VERTEX_SHADER_ARB));
+		gObjectSimpleImpostorProgram.mShaderFiles.push_back(make_pair("objects/simpleF.glsl", GL_FRAGMENT_SHADER_ARB));
+		gObjectSimpleImpostorProgram.mShaderLevel = mVertexShaderLevel[SHADER_OBJECT];
+		
+		success = gObjectSimpleImpostorProgram.createShader(NULL, NULL);
+	}
+
 	if (success)
 	{
 		gObjectSimpleWaterProgram.mName = "Simple Water Shader";
diff --git a/indra/newview/llviewershadermgr.h b/indra/newview/llviewershadermgr.h
index 08c1ce6911..e4684c19d5 100755
--- a/indra/newview/llviewershadermgr.h
+++ b/indra/newview/llviewershadermgr.h
@@ -242,6 +242,7 @@ extern LLGLSLShader			gOneTextureNoColorProgram;
 
 //object shaders
 extern LLGLSLShader			gObjectSimpleProgram;
+extern LLGLSLShader			gObjectSimpleImpostorProgram;
 extern LLGLSLShader			gObjectPreviewProgram;
 extern LLGLSLShader			gObjectSimpleAlphaMaskProgram;
 extern LLGLSLShader			gObjectSimpleWaterProgram;
-- 
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