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OS X: Async readback doesn't work #118

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eile opened this issue Apr 30, 2012 · 1 comment
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OS X: Async readback doesn't work #118

eile opened this issue Apr 30, 2012 · 1 comment
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eile commented Apr 30, 2012

Asynchronous readbacks don't work on my machine (nVidia GPU). Iirc PBO readbacks are broken on OS X. Verify and implement workaround.
@ghost ghost assigned maxmah Apr 30, 2012
eile added a commit that referenced this issue Apr 30, 2012
@eile
Disable async readbacks on OS X (#118)
40434dd
@eile eile closed this as completed in c1b721b Jul 9, 2012
@ghost ghost assigned eile Jul 9, 2012
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eile commented Jul 9, 2012

The reason is that GL does not guarantee that the commands are sent to the GPU without a flush. What happened is that the readpixel and PBO tokens are inserted into the command stream, but not flushed to the GPU. When the second thread tries to map the buffer the GPU doesn't know anything about it. This could also be the reason for issue #138

@eile eile mentioned this issue Jul 9, 2012
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