Some simple GLSL image processing using fragment shaders from Chapter 17 of the OpenGL SuperBible (4th Edition - I'm not seeing these shaders in the 5th edition). I'm rendering the skybox and torus' with ambient, diffuse, specular lighting plus cubemap texture lookup to an FBO, then that rendering that as a full-screen quad to do the image-processing in 2D.
Full shader source code available at: http://r3dux.org/
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