xlib st: Fix makeCurrent.

Flush if we change context.
Also reinstate the old optimization of doing nothing if
nothing changes.

Signed-off-by: Thomas Hellstrom <thellstrom-at-vmware-dot-com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gallium/state_trackers/glx/xlib/xm_api.h b/src/gallium/state_trackers/glx/xlib/xm_api.h
index 2b8302d174..bdd434cd36 100644
--- a/src/gallium/state_trackers/glx/xlib/xm_api.h
+++ b/src/gallium/state_trackers/glx/xlib/xm_api.h
@@ -295,6 +295,7 @@ struct xmesa_context {
    struct st_context *st;
    XMesaVisual xm_visual;	/** pixel format info */
    XMesaBuffer xm_buffer;	/** current drawbuffer */
+   XMesaBuffer xm_read_buffer;  /** current readbuffer */
 };