- add shader patching to allow running the engine with GLSL 1.2.

- made some initial preparations for the shader-less fallback path.

src/gl/renderer/gl_renderstate.cpp

@@ -279,7 +279,14 @@ void FRenderState::Apply()
 		else mVertexBuffer->BindVBO();
 		mCurrentVertexBuffer = mVertexBuffer;
 	}
-	ApplyShader();
+	if (gl.compatibility > CMPT_GL2) 
+	{
+		ApplyShader();
+	}
+	else
+	{
+		//ApplyFixedFunction();
+	}
 }