Debugging graphics code using replacement shaders (Linux, Mesa)

Sometimes, when working with the mesa drivers, modifying or replacing a shader might be extremely useful for debugging. Mesa allows users to replace their shaders at runtime without having to change the original code by providing these environment variables:

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Libgliar: a library that lies to the OpenGL programs about the OpenGL context information

libgliar — a library that lies to the OpenGL programs about the OpenGL context info (for Linux only). Code: bzr branch lp:libgliar

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