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dri3: add an option to disable the Present wait-fence bridge #105

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Merged
lfdevs merged 1 commit into from
Oct 8, 2026
Merged

dri3: add an option to disable the Present wait-fence bridge #105

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10 changes: 6 additions & 4 deletions src/gallium/frontends/dri/loader_dri3_helper.c
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,7 @@
#include "util/macros.h"
#include "util/u_atomic.h"
#include "util/u_queue.h"
#include "util/u_debug.h"
#include "util/simple_mtx.h"
#include "drm-uapi/drm_fourcc.h"
#include "dri_screen.h"
Expand Down Expand Up @@ -1821,11 +1822,12 @@ dri3_alloc_render_buffer(struct loader_dri3_drawable *draw, unsigned int fourcc,
if (!ret)
buffer->modifier = DRM_FORMAT_MOD_INVALID;

/* Android's dma-buf implementation may lack sync-file import/export even
* though DRI3 buffer sharing itself works. In that case Present needs an
* explicit render-completion fence.
/* Some Android/Xwayland combinations cannot consume the XSync wait fence
* reliably. Keep an escape hatch for those sessions while retaining the
* explicit bridge by default on other platforms.
*/
dri3_present_sync_init(draw, buffer_fds[0]);
if (!debug_get_bool_option("MESA_DRI3_DISABLE_PRESENT_WAIT_FENCE", false))
dri3_present_sync_init(draw, buffer_fds[0]);

if (draw->dri_screen_render_gpu != draw->dri_screen_display_gpu &&
draw->dri_screen_display_gpu && linear_buffer_display_gpu) {
Expand Down