Is it possible to pin a PBO for read and/or write to system memory? Ideally it would be nice to avoid having to synchronize with glMapBuffer and glUnmapBuffer, and use some other way to send the frame via DMA to/from system memory to the GPU.
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[Persistent mapping](https://www.khronos.org/opengl/wiki/Buffer_Object#Persistent_mapping)? – genpfault Dec 13 '19 at 22:33
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What do you mean by "pin" a buffer? – Nicol Bolas Dec 13 '19 at 23:41