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AMD OpenGL drivers claim GL_ARB_shader_image_load_store with no actual support

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  • AMD OpenGL drivers claim GL_ARB_shader_image_load_store with no actual support

    Core Profile Compatibility Profile
    imageAtomicAdd OK BROKEN
    imageAtomicMin OK BROKEN
    imageAtomicMax OK BROKEN
    imageAtomicAnd OK BROKEN
    imageAtomicOr OK BROKEN
    imageAtomicXor OK BROKEN
    imageAtomicExchange OK BROKEN
    imageAtomicCompSwap BROKEN BROKEN
    These results can be reproduced on all driver versions across Linux and Windows. The situation hasn't improved at all since the first drivers with OpenGL 4.2 "support" were released.

    Arguably the most important function for modern shading techniques, imageAtomicCompSwap doesn't work on any combination of profile or platform.

    Drivers making wrong claims about supported functionality is actually worse for application developers than if the functionality wasn't implemented at all, because programs end up relying on broken functionality advertised by the drivers.

    Previous discussion on opengl.org: http://www.opengl.org/discussion_boa...12-6?p=1241539
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