from geometry to pixels


OpenGL conditional rendering bug on MacOS X

At least on Intel HD4000 GPUs there seems to be a bug regarding conditional rendering in OpenGL on 10.8 Mountain Lion: After the conditional rendering the condition state (ignore draw calls or execute them) is ‘stuck’ until the next draw call gets issued – this can ignore glClear calls which shouldn’t get ignored. Here’s an […]


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Noperspective varying interpolation bug on MacOS X

There seems to be a bug with noperspective┬ávaryings in OpenGL 3.2 contexts on MacOS X on Intel HD4000 hardware: The varying does not get interpolated and all fragments of the triangle get the same value (similar to flat interpolation). Note that in the left screen shot the image looks similar to perspective correct interpolated texture […]


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