Typically we want swaps to occur during vertical blank to avoid
tearing. However, when the swap interval is 0 we want to go
as quickly as possible even if this results in tearing.
Indicate to the X server that it should attempt to do an
asynchronise swap when the swap interval is 0.
Signed-off-by: Frank Binns <frank.bi...@imgtec.com>
---
src/glx/dri3_glx.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/glx/dri3_glx.c b/src/glx/dri3_glx.c
index b7dac8e..e385723 100644
--- a/src/glx/dri3_glx.c
+++ b/src/glx/dri3_glx.c
@@ -1321,6 +1321,7 @@ dri3_swap_buffers(__GLXDRIdrawable *pdraw, int64_t
target_msc, int64_t divisor,
xcb_connection_t *c = XGetXCBConnection(dpy);
int buf_id = DRI3_BACK_ID(priv->cur_back);
int64_t ret = 0;
+ uint32_t options = XCB_PRESENT_OPTION_NONE;
unsigned flags = __DRI2_FLUSH_DRAWABLE;
if (flush)
@@ -1339,6 +1340,9 @@ dri3_swap_buffers(__GLXDRIdrawable *pdraw, int64_t
target_msc, int64_t divisor,
if (target_msc == 0)
target_msc = priv->msc + priv->swap_interval * (priv->send_sbc -
priv->recv_sbc);
+ if (priv->swap_interval == 0)
+ options |= XCB_PRESENT_OPTION_ASYNC;
+
priv->buffers[buf_id]->busy = 1;
priv->buffers[buf_id]->last_swap = priv->send_sbc;
xcb_present_pixmap(c,
@@ -1352,7 +1356,7 @@ dri3_swap_buffers(__GLXDRIdrawable *pdraw, int64_t
target_msc, int64_t divisor,
None, /* target_crtc
*/
None,
priv->buffers[buf_id]->sync_fence,
- XCB_PRESENT_OPTION_NONE,
+ options,
target_msc,
divisor,
remainder, 0, NULL);
--
1.8.5.4.gfdaaaa2
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