On 05/09/18 23:36, Thomas Hellstrom wrote:
On 09/05/2018 02:36 PM, Timothy Arceri wrote:
On 05/09/18 22:09, Thomas Hellstrom wrote:
On 09/05/2018 01:45 PM, Timothy Arceri wrote:
On 16/08/17 04:31, Thomas Hellstrom wrote:
Implement back-to-fake-front flips,
Fix EGL_BUFFER_PRESERVED path.
Implement dri3 support for GLX_SWAP_EXCHANGE_OML and
GLX_SWAP_COPY_OML.
The back-to-fake-front flips will save a full buffer copy in the
case of a
fake front being enabled and GLX_SWAP_UNDEFINED_OML.
Support for EGL_BUFFER_PRESERVED and GLX_SWAP_X_OML are mostly
useful for
things like glretrace if traces are capured with applications
relying on a
specific swapbuffer behavior.
The EGL_BUFFER_PRESERVED path previously made sure the present was
done as
a copy, but there was nothing making sure that after the present,
the same back buffer was chosen.
This has now been changed so that if the previous back buffer is
idle, we reuse it. Otherwise we grab a new and copy the contents and
buffer age from the previous back buffer. Server side flips are
allowed.
GLX_SWAP_COPY_OML will behave like EGL_BUFFER_PRESERVED.
GLX_SWAP_EXCHANGE_OML will behave similarly, except that we try to
reuse the
previous fake front as the new back buffer if it's idle. If not, we
grab
a new back buffer and copy the contents and buffer age from the old
fake front.
v2:
- Split the original patch,
- Make sure we have a context for blitImage even if we don't have a
current context.
- Make sure the delayed backbuffer allocation is performed before
glXSwapBuffers, glXCopyBuffers and querying buffer age.
v3:
- squash three patches related to the same change.
- Address review comments by Michel Dänzer.
Testing done:
piglit tests/quick without regressions on svga.
A modified piglit glx-swap-exchange posted for review on the piglit
list.
That test required modifying the dri2 state tracke to advertise
unconditional
support for GLX_SWAP_EXCHANGE_OML
What exactly do I need to do to force this to be advertised? A
bigger question is what more is required to expose
GLX_SWAP_EXCHANGE_OML more generally?
It seems this is required for a few games running on wine [1].
[1]
https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.freedesktop.org%2Fshow_bug.cgi%3Fid%3D97516&data=02%7C01%7Cthellstrom%40vmware.com%7Cc71a9d949e56467614c108d6132c3212%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C1%7C0%7C636717488813233512&sdata=%2FmIsVYyD7Uvg2DwynXKJS3Am%2FEKiyBVz1d%2BSwjIq2Jw%3D&reserved=0
You need to get the X server AIGLX to advertize it, because the
available features are the intersection of the X server AIGLX
features and the dri driver features, even if this is purely
implemented in the dri client. The reason GLX works this way is that
after you've choosen your config you can either choose to select a
direct or indirect context. That was a poor design.
Now the problem is that AIGLX isn't able to support it, because it
uses the dri driver dri2 path rather than the dri3 path, and I never
got to modifying AIGLX to use the dri3 path. Didn't think it was
worth the extra work.
Hmm ... thanks for the info. I should at least add some of this to the
bug report.
In any case, you can hack-enable GLX_SWAP_EXCHANGE_OML if the client
is using dri3 by adding __DRI_ATTRIB_SWAP_EXCHANGE to
back_buffer_modes[] in src/gallium/state_trackers/dri/dri_screen.c,
recompile and make sure the X server also picks up the recompiled
driver. That is if you have a gallium driver. This worked fine with
vmwgfx at the time I pushed the patch as tested by the corresponding
piglit test.
I did try this already with radeonsi but it didn't seem to work. I
even restarted my PC to make sure the correct driver was selected.
How did you test? I'll give it a test on vmwgfx + piglit.
/Thomas
I just tried running the glx-swap-exchange piglit test. I was still getting:
Couldn't get a GLX_SWAP_EXCHANGE_OML, RGBA, double-buffered fbconfig
PIGLIT: {"result": "skip" }
For the other dri drivers there should be a similar way to set the
back_buffer_modes[].
Thanks,
Thomas
A piglit glx-swap-copy test derived from the glx-swap-exchange test.
Not posted yet.
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