- use FShaderProgram through an abstract interface and remove all dependencies on the GL renderer from the shader definition source files.

src/gl/system/gl_framebuffer.h

@@ -45,6 +45,7 @@ public:
 	void SetViewportRects(IntRect *bounds) override;
 	void BlurScene(float amount) override;
     IUniformBuffer *CreateUniformBuffer(size_t size, bool staticuse = false) override;
+	IShaderProgram *CreateShaderProgram() override;
 
 
 	// Retrieves a buffer containing image data for a screenshot.