From: Marek Olšák <[email protected]>
This is the best guess I can make here.
---
src/mesa/state_tracker/st_manager.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/src/mesa/state_tracker/st_manager.c
b/src/mesa/state_tracker/st_manager.c
index 5efbd1fa1d2..bee1f6b1366 100644
--- a/src/mesa/state_tracker/st_manager.c
+++ b/src/mesa/state_tracker/st_manager.c
@@ -1123,23 +1123,33 @@ st_api_destroy(struct st_api *stapi)
/**
* Flush the front buffer if the current context renders to the front buffer.
*/
void
st_manager_flush_frontbuffer(struct st_context *st)
{
struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
struct st_renderbuffer *strb = NULL;
- if (stfb)
- strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].
- Renderbuffer);
+ if (!stfb)
+ return;
+
+ /* If the context uses a doublebuffered visual, but the buffer is
+ * single-buffered, guess that it's a pbuffer, which doesn't need
+ * flushing.
+ */
+ if (st->ctx->Visual.doubleBufferMode &&
+ !stfb->Base.Visual.doubleBufferMode)
+ return;
+
+ strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].
+ Renderbuffer);
/* Do we have a front color buffer and has it been drawn to since last
* frontbuffer flush?
*/
if (strb && strb->defined) {
stfb->iface->flush_front(&st->iface, stfb->iface,
ST_ATTACHMENT_FRONT_LEFT);
strb->defined = GL_FALSE;
/* Trigger an update of strb->defined on next draw */
--
2.17.1
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