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xwayland/eglstream: flush stream after eglSwapBuffers 

When eglSwapBuffers inserts a new frame into a window's stream, there may be a
delay before the state of the consumer end of the stream is updated to reflect
this. If the subsequent wl_surface_attach, wl_surface_damage, wl_surface_commit
calls are received by the compositor before then, it will (typically) re-use
the previous frame acquired from the stream instead of the latest one.

This can leave the window displaying out-of-date contents, which might never be
updated thereafter.

To fix this, after calling eglSwapBuffers, xwl_glamor_eglstream_post_damage
should call eglStreamFlushNV. This call will block until it can be guaranteed
that the state of the consumer end of the stream has been updated to reflect
that a new frame is available.

Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1171

Signed-off-by: Erik Kurzinger <ekurzinger@nvidia.com>
(cherry picked from commit 7515c23a41)
This commit is contained in:
Erik Kurzinger 2021-05-11 17:00:21 -04:00 committed by Olivier Fourdan
parent b2963fccc1
commit f4720f1c42
1 changed files with 20 additions and 0 deletions
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20
hw/xwayland/xwayland-glamor-eglstream.c
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@ -72,6 +72,7 @@ struct xwl_eglstream_private {
SetWindowPixmapProcPtr SetWindowPixmap;
Bool have_egl_damage;
Bool have_egl_stream_flush;
GLint blit_prog;
GLuint blit_vao;
@ -776,6 +777,13 @@ xwl_glamor_eglstream_post_damage(struct xwl_window *xwl_window,
goto out;
}
#ifdef EGL_NV_stream_flush
if (xwl_eglstream->have_egl_stream_flush)
/* block until stream state is updated on the compositor's side */
eglStreamFlushNV(xwl_screen->egl_display,
xwl_pixmap->stream);
#endif
if (!xwl_pixmap->wait_for_buffer_release) {
/* hang onto the pixmap until the compositor has released it */
pixmap->refcnt++;
@ -1173,6 +1181,18 @@ xwl_glamor_eglstream_init_egl(struct xwl_screen *xwl_screen)
ErrorF("Driver lacks EGL_KHR_swap_buffers_with_damage, performance "
"will be affected\n");
#ifdef EGL_NV_stream_flush
xwl_eglstream->have_egl_stream_flush =
epoxy_has_egl_extension(xwl_screen->egl_display,
"EGL_NV_stream_flush");
#else
xwl_eglstream->have_egl_stream_flush = FALSE;
#endif /* EGL_NV_stream_flush */
if (!xwl_eglstream->have_egl_stream_flush)
ErrorF("EGL_NV_stream_flush not available, "
"this may cause visible corruption.\n");
xwl_eglstream_init_shaders(xwl_screen);
if (epoxy_has_gl_extension("GL_OES_EGL_image") &&