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DXT5 + ATI + invalid floating operation

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Using _control87 for catching invalid floating operations, ATI will crash with "STATUS_FLOAT_INVALID_OPERATION" on DXT5 formatted textures when that texture is enabled and the geometry is rendered. NVIDIA does not crash. DXT3 and DXT1 formats do not crash on ATI. Only DXT5 on ATI. I'm hoping someone here may have experienced this before and have a workaround.

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