[Mesa-dev] radeon cmask sync with EGL/GBM

[Jay Cornwall]

Hi,

Using EGL with the GBM platform it is possible to bind a GBM surface to 
a GL renderbuffer. I believe it's also valid to use the GBM BO as a 
framebuffer target with drmModeAddFB/drmModePageFlip.

I haven't been able to locate a clear statement on synchronizing GL 
operations with the DRM page flip in the extension specifications.

gallium/radeonsi does not unpack a GBM BO's fast cleared cmask on 
glFlush, leading to desync between the GL and DRM views of the GBM BO. 
Could somebody with a better understanding of the EGL synchronization 
semantics suggest how this might be handled?

-- 
Jay Cornwall