#5567: getBlendFunc() needs to return GL-compatible values. Since the…

… blend func strings stored in the layer can also have the DBS shortcuts "specularmap" or "bumpmap", we need to handle those too. They are used as blend mode for the editor pass as well, so this fixes the roundtop windows being rendered as black in the non-lit render mode.

radiantcore/shaders/Doom3ShaderLayer.cpp

@@ -51,7 +51,11 @@ GLenum glBlendFromString(const std::string& value)
 BlendFunc blendFuncFromStrings(const StringPair& blendFunc)
 {
     // Handle predefined blend modes first: add, modulate, filter
-    if (blendFunc.first == "add")
+    if (blendFunc.first == "diffusemap" || blendFunc.first == "bumpmap" || blendFunc.first == "specularmap")
+    {
+        return BlendFunc(GL_ONE, GL_ZERO);
+    }
+    else if (blendFunc.first == "add")
     {
         return BlendFunc(GL_ONE, GL_ONE);
     }