renderer/glsl: do alpha discard before texture blending

Author: illwieckz

src/engine/renderer/glsl_source/lightMapping_fp.glsl

@@ -61,15 +61,15 @@ void	main()
 	// compute the diffuse term
 	vec4 diffuse = texture2D(u_DiffuseMap, texCoords);
 
-	// vertex blend operation like: alphaGen vertex
-	diffuse *= var_Color;
-
 	if( abs(diffuse.a + u_AlphaThreshold) <= 1.0 )
 	{
 		discard;
 		return;
 	}
 
+	// vertex blend operation like: alphaGen vertex
+	diffuse *= var_Color;
+
 	// compute normal in world space from normalmap
 	vec3 normal = NormalInWorldSpace(texCoords, tangentToWorldMatrix);
 

src/engine/renderer/glsl_source/vertexLighting_DBS_entity_fp.glsl

@@ -72,15 +72,15 @@ void	main()
 	// compute the diffuse term
 	vec4 diffuse = texture2D(u_DiffuseMap, texCoords);
 
-	// vertex blend operation like: alphaGen vertex
-	diffuse *= var_Color;
-
 	if( abs(diffuse.a + u_AlphaThreshold) <= 1.0 )
 	{
 		discard;
 		return;
 	}
 
+	// vertex blend operation like: alphaGen vertex
+	diffuse *= var_Color;
+
 	// compute normal in world space from normalmap
 	vec3 normal = NormalInWorldSpace(texCoords, tangentToWorldMatrix);
 

src/engine/renderer/glsl_source/vertexLighting_DBS_world_fp.glsl

@@ -72,15 +72,15 @@ void	main()
 	// compute the diffuse term
 	vec4 diffuse = texture2D(u_DiffuseMap, texCoords);
 
-	// vertex blend operation like: alphaGen vertex
-	diffuse *= var_Color;
-
 	if( abs(diffuse.a + u_AlphaThreshold) <= 1.0 )
 	{
 		discard;
 		return;
 	}
 
+	// vertex blend operation like: alphaGen vertex
+	diffuse *= var_Color;
+
 	// compute normal in world space from normalmap
 	vec3 normal = NormalInWorldSpace(texCoords, tangentToWorldMatrix);