Mesa (master): st/xlib: Flush the front buffer before doing CopySubBuffer

[Stephane Marchesin]

Module: Mesa
Branch: master
Commit: 4f905d4900ea962876eb5933dd00d4b251767f71
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=4f905d4900ea962876eb5933dd00d4b251767f71

Author: Stéphane Marchesin <marcheu at chromium.org>
Date:   Fri May 10 18:30:46 2013 -0700

st/xlib: Flush the front buffer before doing CopySubBuffer

We flush pending rendering before running CopySubBuffer, which
ensures that the right bits get to the screen.

NOTE: This is a candidate for stable release branches.

Reviewed-by: Brian Paul <brianp at vmware.com>

---

 src/gallium/state_trackers/glx/xlib/xm_api.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/gallium/state_trackers/glx/xlib/xm_api.c b/src/gallium/state_trackers/glx/xlib/xm_api.c
index c39968d..b758c8e 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_api.c
+++ b/src/gallium/state_trackers/glx/xlib/xm_api.c
@@ -1253,6 +1253,10 @@ void XMesaSwapBuffers( XMesaBuffer b )
  */
 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
 {
+   XMesaContext xmctx = XMesaGetCurrentContext();
+
+   xmctx->st->flush( xmctx->st, ST_FLUSH_FRONT, NULL);
+
    xmesa_copy_st_framebuffer(b->stfb,
          ST_ATTACHMENT_BACK_LEFT, ST_ATTACHMENT_FRONT_LEFT,
          x, b->height - y - height, width, height);