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@vmware.com>
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 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);