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glReadPixels + Intel 4600 + OSX

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Offline Obsyd

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glReadPixels + Intel 4600 + OSX
« on: February 17, 2017, 17:12:13 »
Hello there all! I'm trying to copy 1 pixel into a PBO from my actual rendering framebuffer with glReadPixels. If I'm correct if I bind a buffer object that is a type of GL_PIXEL_PACK_BUFFER the glReadPixels call should not block! My problem is that it does block (4-10ms) on an integrated Intel HD 4600 igpu on OSX. I tried the code on a windows machine with a dedicated nvidia card (0.02ms) and on that machine everything is fine!
Anyone had a similar problem? Is there a solution? I'm trying to implement pixel perfect model selection.

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Offline spasi

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Re: glReadPixels + Intel 4600 + OSX
« Reply #1 on: February 17, 2017, 21:15:06 »
@badlogicgames recently had the same issue.

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Offline Obsyd

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Re: glReadPixels + Intel 4600 + OSX
« Reply #2 on: February 18, 2017, 11:58:12 »
Thank you for the heads up! I'm starting to question my love towards osx.  :-\