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Post-processing shaders

Added post-processing shader support to the engine. Post-processing shaders can be used to apply full screen effects to scenes. Examples of such shaders include full-screen anti-aliasing, vignette effects and motion blur to name but a few. With a post processing shader the scene is typically rendered to a texture that is bound to an off screen frame buffer with appropriate depth and color attachments. The texture is then applied to a full screen quad and rendered to screen. This short clip demonstrates the post processing shader.