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Draft: render: asynchronous read_pixels

Simon Ser requested to merge github/fork/emersion/pbo into master
  • GL_STREAM_READ is not GLES2
  • Use EGLSyncKHR to synchronize reads
  • Make API async
  • Use sync fences to wait for DMA transfer to be complete

Mesa patch: mesa/mesa!4422 (merged) (merged)

Closes: https://github.com/swaywm/wlroots/issues/2091

Edited by Simon Ser

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