Comment out a useAttrColor case that doesn't work

Author: slipher

src/engine/renderer/Material.cpp

@@ -1318,8 +1318,11 @@ void ProcessMaterialLightMapping( Material* material, shaderStage_t* pStage, dra
 	colorGen_t rgbGen = SetRgbGen( pStage );
 	alphaGen_t alphaGen = SetAlphaGen( pStage );
 
-	material->useAttrColor = rgbGen == colorGen_t::CGEN_VERTEX || rgbGen == colorGen_t::CGEN_ONE_MINUS_VERTEX
-		|| alphaGen == alphaGen_t::AGEN_VERTEX || alphaGen == alphaGen_t::AGEN_ONE_MINUS_VERTEX;
+	// useAttrColor has no effect since the lightMapping shader has ATTR_COLOR forced to be always
+	// on (_requiredVertexAttribs). If we removed ATTR_COLOR from there, we would need to detect
+	// implicit vertex lighting as well, not only rgbgen (see SetLightDeluxeMode).
+	/* material->useAttrColor = rgbGen == colorGen_t::CGEN_VERTEX || rgbGen == colorGen_t::CGEN_ONE_MINUS_VERTEX
+		|| alphaGen == alphaGen_t::AGEN_VERTEX || alphaGen == alphaGen_t::AGEN_ONE_MINUS_VERTEX; */
 
 	material->enableDeluxeMapping = enableDeluxeMapping;
 	material->enableGridLighting = enableGridLighting;