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Now that the GLSL backend can generate code it can effectively handle any pipeline unless there is an ARBfp program. However with current open source GL drivers the ARBfp compiler is more stable so it makes sense to prefer ARBfp when possible. The GLSL backend is also lower than the fixed function backend on the assumption that any driver that supports GLSL will also support ARBfp so it's quicker to try the fixed function backend next.