SH-2743 Fix for shader compiler error on some GL 3.x implementations.

3 files changed, 14 insertions, 7 deletions

diff --git a/indra/llrender/llglslshader.cpp b/indra/llrender/llglslshader.cpp
index 5a6f3d8292..6b2852670a 100644
--- a/indra/llrender/llglslshader.cpp
+++ b/indra/llrender/llglslshader.cpp
@@ -66,7 +66,7 @@ BOOL shouldChange(const LLVector4& v1, const LLVector4& v2)
 LLShaderFeatures::LLShaderFeatures()
 : calculatesLighting(false), isShiny(false), isFullbright(false), hasWaterFog(false),
 hasTransport(false), hasSkinning(false), hasObjectSkinning(false), hasAtmospherics(false), isSpecular(false),
-hasGamma(false), hasLighting(false), calculatesAtmospherics(false), mIndexedTextureChannels(0), disableTextureIndex(false),
+hasGamma(false), hasLighting(false), isAlphaLighting(false), calculatesAtmospherics(false), mIndexedTextureChannels(0), disableTextureIndex(false),
 hasAlphaMask(false)
 {
 }
diff --git a/indra/llrender/llglslshader.h b/indra/llrender/llglslshader.h
index 2a6c050eac..00b4b0dbd4 100644
--- a/indra/llrender/llglslshader.h
+++ b/indra/llrender/llglslshader.h
@@ -36,6 +36,7 @@ public:
 	bool calculatesLighting;
 	bool calculatesAtmospherics;
 	bool hasLighting; // implies no transport (it's possible to have neither though)
+	bool isAlphaLighting; // indicates lighting shaders need not be linked in (lighting performed directly in alpha shader to match deferred lighting functions)
 	bool isShiny;
 	bool isFullbright; // implies no lighting
 	bool isSpecular;
diff --git a/indra/llrender/llshadermgr.cpp b/indra/llrender/llshadermgr.cpp
index 85c4bab7a9..1a03aeebb7 100644
--- a/indra/llrender/llshadermgr.cpp
+++ b/indra/llrender/llshadermgr.cpp
@@ -107,10 +107,13 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 			{
 				return FALSE;
 			}
-			
-			if (!shader->attachObject("lighting/sumLightsSpecularV.glsl"))
+		
+			if (!features->isAlphaLighting)
 			{
-				return FALSE;
+				if (!shader->attachObject("lighting/sumLightsSpecularV.glsl"))
+				{
+					return FALSE;
+				}
 			}
 			
 			if (!shader->attachObject("lighting/lightSpecularV.glsl"))
@@ -125,9 +128,12 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 				return FALSE;
 			}
 			
-			if (!shader->attachObject("lighting/sumLightsV.glsl"))
+			if (!features->isAlphaLighting)
 			{
-				return FALSE;
+				if (!shader->attachObject("lighting/sumLightsV.glsl"))
+				{
+					return FALSE;
+				}
 			}
 			
 			if (!shader->attachObject("lighting/lightV.glsl"))
@@ -296,7 +302,7 @@ BOOL LLShaderMgr::attachShaderFeatures(LLGLSLShader * shader)
 				}
 				shader->mFeatures.mIndexedTextureChannels = llmax(LLGLSLShader::sIndexedTextureChannels-1, 1);
 			}
-		}		
+		}
 	}
 	
 	// NOTE order of shader object attaching is VERY IMPORTANT!!!