+static void
+dri2_release_pending_buffer(void *data)
+{
+ struct dri2_egl_surface *dri2_surf = data;
+ struct dri2_egl_display *dri2_dpy =
+ dri2_egl_display(dri2_surf->base.Resource.Display);
+
+ /* FIXME: print internal error */
+ if (!dri2_surf->pending_buffer)
+ return;
+
+ dri2_dpy->dri2->releaseBuffer(dri2_dpy->dri_screen,
+ dri2_surf->pending_buffer);
+ dri2_surf->pending_buffer = NULL;
+}
+
+static void
+dri2_release_buffers(struct dri2_egl_surface *dri2_surf)
+{
+ struct dri2_egl_display *dri2_dpy =
+ dri2_egl_display(dri2_surf->base.Resource.Display);
+ int i;
+
+ if (dri2_surf->third_buffer) {
+ dri2_dpy->dri2->releaseBuffer(dri2_dpy->dri_screen,
+ dri2_surf->third_buffer);
+ dri2_surf->third_buffer = NULL;
+ }
+
+ for (i = 0; i < __DRI_BUFFER_COUNT; ++i) {
+ if (dri2_surf->dri_buffers[i]) {
+ switch (i) {
+ case __DRI_BUFFER_FRONT_LEFT:
+ if (dri2_surf->pending_buffer)
+ force_roundtrip(dri2_dpy->wl_dpy);
+ dri2_surf->pending_buffer = dri2_surf->dri_buffers[i];
+ wl_display_sync_callback(dri2_dpy->wl_dpy,
+ dri2_release_pending_buffer, dri2_surf);
+ break;
+ default:
+ dri2_dpy->dri2->releaseBuffer(dri2_dpy->dri_screen,
+ dri2_surf->dri_buffers[i]);
+ break;
+ }
+ dri2_surf->dri_buffers[i] = NULL;
+ }
+ }
+}
+
+static inline void
+pointer_swap(const void **p1, const void **p2)
+{
+ const void *tmp = *p1;
+ *p1 = *p2;
+ *p2 = tmp;
+}
+
+static void
+destroy_third_buffer(struct dri2_egl_surface *dri2_surf)
+{
+ struct dri2_egl_display *dri2_dpy =
+ dri2_egl_display(dri2_surf->base.Resource.Display);
+
+ if (dri2_surf->third_buffer == NULL)
+ return;
+
+ dri2_dpy->dri2->releaseBuffer(dri2_dpy->dri_screen,
+ dri2_surf->third_buffer);
+ dri2_surf->third_buffer = NULL;
+
+ if (dri2_surf->wl_drm_buffer[WL_BUFFER_THIRD])
+ wl_buffer_destroy(dri2_surf->wl_drm_buffer[WL_BUFFER_THIRD]);
+ dri2_surf->wl_drm_buffer[WL_BUFFER_THIRD] = NULL;
+ dri2_surf->wl_buffer_lock[WL_BUFFER_THIRD] = 0;
+}
+
+static void
+swap_wl_buffers(struct dri2_egl_surface *dri2_surf,
+ enum wayland_buffer_type a, enum wayland_buffer_type b)
+{
+ int tmp;
+
+ tmp = dri2_surf->wl_buffer_lock[a];
+ dri2_surf->wl_buffer_lock[a] = dri2_surf->wl_buffer_lock[b];
+ dri2_surf->wl_buffer_lock[b] = tmp;
+
+ pointer_swap((const void **) &dri2_surf->wl_drm_buffer[a],
+ (const void **) &dri2_surf->wl_drm_buffer[b]);
+}
+
+static void
+swap_back_and_third(struct dri2_egl_surface *dri2_surf)
+{
+ if (dri2_surf->wl_buffer_lock[WL_BUFFER_THIRD])
+ destroy_third_buffer(dri2_surf);
+
+ pointer_swap((const void **) &dri2_surf->dri_buffers[__DRI_BUFFER_BACK_LEFT],
+ (const void **) &dri2_surf->third_buffer);
+
+ swap_wl_buffers(dri2_surf, WL_BUFFER_BACK, WL_BUFFER_THIRD);
+}
+
+static void
+dri2_prior_buffer_creation(struct dri2_egl_surface *dri2_surf,
+ unsigned int type)
+{
+ switch (type) {
+ case __DRI_BUFFER_BACK_LEFT:
+ if (dri2_surf->wl_buffer_lock[WL_BUFFER_BACK])
+ swap_back_and_third(dri2_surf);
+ else if (dri2_surf->third_buffer)
+ destroy_third_buffer(dri2_surf);
+ break;
+ default:
+ break;
+
+ }
+}
+