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egl/wayland: Prefer back buffer with minimum buffer age

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This may allow applications making use of buffer age to save some effort
in some cases.

v2: (Simon Ser)
* Add space between struct member and "<" operator.
* Remove break statement which prevented the change from working as
  intended in swrast_update_buffers.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18269>
This commit is contained in:
Michel Dänzer 2021-08-20 17:56:24 +02:00 • committed by Marge Bot
parent ec90a6e132
commit bdcbdfdfcb
1 changed files with 16 additions and 10 deletions
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26
src/egl/drivers/dri2/platform_wayland.c
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@ -1033,12 +1033,15 @@ get_back_bo(struct dri2_egl_surface *dri2_surf)
while (dri2_surf->back == NULL) {
for (int i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++) {
/* Get an unlocked buffer, preferably one with a dri_buffer
* already allocated. */
* already allocated and with minimum age.
*/
if (dri2_surf->color_buffers[i].locked)
continue;
if (dri2_surf->back == NULL)
dri2_surf->back = &dri2_surf->color_buffers[i];
else if (dri2_surf->back->dri_image == NULL)
if (!dri2_surf->back ||
!dri2_surf->back->dri_image ||
(dri2_surf->color_buffers[i].age > 0 &&
dri2_surf->color_buffers[i].age < dri2_surf->back->age))
dri2_surf->back = &dri2_surf->color_buffers[i];
}
@ -2351,13 +2354,16 @@ swrast_update_buffers(struct dri2_egl_surface *dri2_surf)
/* There might be a buffer release already queued that wasn't processed */
wl_display_dispatch_queue_pending(dri2_dpy->wl_dpy, dri2_surf->wl_queue);
/* try get free buffer already created */
/* Try to get free buffer already created and with minimum age */
for (int i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++) {
if (!dri2_surf->color_buffers[i].locked &&
dri2_surf->color_buffers[i].wl_buffer) {
dri2_surf->back = &dri2_surf->color_buffers[i];
break;
}
if (dri2_surf->color_buffers[i].locked ||
!dri2_surf->color_buffers[i].wl_buffer)
continue;
if (!dri2_surf->back ||
(dri2_surf->color_buffers[i].age > 0 &&
dri2_surf->color_buffers[i].age < dri2_surf->back->age))
dri2_surf->back = &dri2_surf->color_buffers[i];
}
/* else choose any another free location */