dri2: Event driven buffer validation.

When a buffer invalidation event is received from the X server, the
"invalidate" hook of the DRI2 flush extension is executed: A generic
implementation (dri2InvalidateDrawable) is provided that just bumps
the "pStamp" sequence number in __DRIdrawableRec.

For old servers not supporting buffer invalidation events, the
invalidate hook will be called before flushing the fake front/back
buffer (that's typically once per frame -- not a lot worse than the
situation we were in before).

No effort has been made on preserving backwards compatibility with
version 2 of the flush extension, but I think it's acceptable because
AFAIK no released stack is making use of it.

Signed-off-by: Kristian Høgsberg <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/glx/glxclient.h b/src/glx/glxclient.h
index f88e9fbcded..04ce781c435 100644
--- a/src/glx/glxclient.h
+++ b/src/glx/glxclient.h
@@ -182,6 +182,8 @@ struct __GLXDRIdrawableRec
 extern __GLXDRIdisplay *driswCreateDisplay(Display * dpy);
 extern __GLXDRIdisplay *driCreateDisplay(Display * dpy);
 extern __GLXDRIdisplay *dri2CreateDisplay(Display * dpy);
+extern void dri2InvalidateBuffers(Display *dpy, XID drawable);
+
 
 extern void DRI_glXUseXFont(Font font, int first, int count, int listbase);