On 10/01/2016 19:38, Jay Cornwall wrote:
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?
Hi,
In my understanding, flushing before asking for a drm page flip should
be enough for the synchronization.
You may want in addition to do some manual throttling, since the one
usually done in eglSwapBuffers won't happen.
I believe the fact the gbm bo fast cleared cmask is not resolved on
glFlush is a bug.
Here was an attempt to advertise info to the driver to disable cmask for
gbm bos:
http://lists.freedesktop.org/archives/mesa-dev/2015-October/097920.html
Yours,
Axel
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