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The uniforms for the alpha test reference value and point size on GLES2 are updating using similar code. This generalizes the code so that there is a static array of predefined builtin uniforms which contains the uniform name, a pointer to a function to get the value from the pipeline, a pointer to a function to update the uniform and a flag representing which CoglPipelineState change affects the uniform. The uniforms are then updated in a loop. This should simplify adding more builtin uniforms.