Am 02.09.2016 um 04:03 schrieb Michel Dänzer:
On 02/09/16 10:17 AM, Michel Dänzer wrote:
On 02/09/16 12:58 AM, Leo Liu wrote:
On 09/01/2016 11:54 AM, Nayan Deshmukh wrote:
I saw the code in dri3_glx.c and I could somewhat relate some basic
code structure to the vl_winsys_dri3.c. But I am new to this and not aware of
the
terminology that you used about the buffers. Could you please explain what needs
to be done in more detail or point me to where I can read about it.
I believe it's from loader_dri3_helper.c with "is_different_gpu"
condition true, that will include back buffer and front buffer case.
you could try only back buffer case for now.
From a high level, PRIME mainly affects presentation, not so much the
video decoding / rendering. The important thing is that the buffer used
for presentation via the Present extension is linear, not tiled. I'm not
sure whether it makes more sense to allocate a separate linear buffer
for this purpose, as is done for GLX, or for the vl code to make the
corresponding back (or front?) buffer linear in the first place.
A separate linear buffer is probably better, actually, since it will
also be pinned to system memory while it's being shared with another GPU.
Yes, I agree. Nayan should also work on avoiding the extra copy which
currently occur because we can't allocate output buffers directly in the
format needed for presentation.
The general idea should be to to check during presentation if the format
in the output surface is displayable directly. If that is the case then
handle of that surface should be send directly to X.
If that isn't the case we reallocate the backing buffer, copy the
content of the output surface into it and then send the new handle to X.
Regards,
Christian.
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