Mesa (master): glx/dri2: Don't call X server for SwapBuffers when there' s no back buffer.

[Michel Dänzer]

Module: Mesa
Branch: master
Commit: d8c443ddde5e9734d60b63b3ec3b5a5ba756d022
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d8c443ddde5e9734d60b63b3ec3b5a5ba756d022

Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Wed Sep 14 18:37:48 2011 +0200

glx/dri2: Don't call X server for SwapBuffers when there's no back buffer.

As already done in dri2CopySubBuffer().

Should fix:

https://bugs.freedesktop.org/show_bug.cgi?id=36371
https://bugs.freedesktop.org/show_bug.cgi?id=40533

Might fix:

https://bugs.freedesktop.org/show_bug.cgi?id=32589

Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>

---

 src/glx/dri2_glx.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
index b83da60..2d72ae0 100644
--- a/src/glx/dri2_glx.c
+++ b/src/glx/dri2_glx.c
@@ -543,6 +543,10 @@ dri2SwapBuffers(__GLXDRIdrawable *pdraw, int64_t target_msc, int64_t divisor,
 	(struct dri2_display *)dpyPriv->dri2Display;
     CARD64 ret = 0;
 
+    /* Check we have the right attachments */
+    if (!priv->have_back)
+	return ret;
+
     /* Old servers can't handle swapbuffers */
     if (!pdp->swapAvailable) {
        dri2CopySubBuffer(pdraw, 0, 0, priv->width, priv->height);