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cogl: Flush specific framebuffers

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This resolves a couple of FIXMEs. The FIXME comments were right in
stating that not *all* journals needed flushing, only the one we
are trying to put on screen needs flushing.

However we can't eliminate all flushes because the winsys swap calls
that follow go directly into OpenGL which knows nothing about cogl
journalling. So the journal *must* be flushed before the swap, to give
OpenGL the correct state.

P.S. If this turns out to cause any bugs then the next best answer is
to just remove the FIXME comments. Because flushing is still the right
thing to do.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1362
This commit is contained in:
Daniel van Vugt 2020-07-09 14:03:53 +08:00 committed by Georges Basile Stavracas Neto
parent db7967327a
commit 647eec5f7f
1 changed files with 2 additions and 4 deletions
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6
cogl/cogl/cogl-onscreen.c
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@ -304,8 +304,7 @@ cogl_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
info->frame_counter = onscreen->frame_counter;
g_queue_push_tail (&onscreen->pending_frame_infos, info);
/* FIXME: we shouldn't need to flush *all* journals here! */
cogl_flush ();
_cogl_framebuffer_flush_journal (framebuffer);
winsys = _cogl_framebuffer_get_winsys (framebuffer);
winsys->onscreen_swap_buffers_with_damage (onscreen,
@ -354,8 +353,7 @@ cogl_onscreen_swap_region (CoglOnscreen *onscreen,
info->frame_counter = onscreen->frame_counter;
g_queue_push_tail (&onscreen->pending_frame_infos, info);
/* FIXME: we shouldn't need to flush *all* journals here! */
cogl_flush ();
_cogl_framebuffer_flush_journal (framebuffer);
winsys = _cogl_framebuffer_get_winsys (framebuffer);