3 files changed, 27 insertions, 0 deletions
diff --git a/src/glx/x11/dri2_glx.c b/src/glx/x11/dri2_glx.c
index 776a14f614a..0ef5d3ab56f 100644
--- a/src/glx/x11/dri2_glx.c
+++ b/src/glx/x11/dri2_glx.c
@@ -208,7 +208,13 @@ static void dri2CopySubBuffer(__GLXDRIdrawable *pdraw,
     xrect.width = width;
     xrect.height = height;
 
+#ifdef __DRI2_FLUSH
+    if (pdraw->psc->f)
+    	(*pdraw->psc->f->flush)(pdraw->driDrawable);
+#endif
+
     region = XFixesCreateRegion(pdraw->psc->dpy, &xrect, 1);
+    /* should get a fence ID back from here at some point */
     DRI2CopyRegion(pdraw->psc->dpy, pdraw->drawable, region,
 		   DRI2BufferFrontLeft, DRI2BufferBackLeft);
     XFixesDestroyRegion(pdraw->psc->dpy, region);
@@ -236,6 +242,11 @@ static void dri2WaitX(__GLXDRIdrawable *pdraw)
     xrect.width = priv->width;
     xrect.height = priv->height;
 
+#ifdef __DRI2_FLUSH
+    if (pdraw->psc->f)
+    	(*pdraw->psc->f->flush)(pdraw->driDrawable);
+#endif
+
     region = XFixesCreateRegion(pdraw->psc->dpy, &xrect, 1);
     DRI2CopyRegion(pdraw->psc->dpy, pdraw->drawable, region,
 		   DRI2BufferFakeFrontLeft, DRI2BufferFrontLeft);
@@ -256,6 +267,11 @@ static void dri2WaitGL(__GLXDRIdrawable *pdraw)
     xrect.width = priv->width;
     xrect.height = priv->height;
 
+#ifdef __DRI2_FLUSH
+    if (pdraw->psc->f)
+    	(*pdraw->psc->f->flush)(pdraw->driDrawable);
+#endif
+
     region = XFixesCreateRegion(pdraw->psc->dpy, &xrect, 1);
     DRI2CopyRegion(pdraw->psc->dpy, pdraw->drawable, region,
 		   DRI2BufferFrontLeft, DRI2BufferFakeFrontLeft);
diff --git a/src/glx/x11/dri_common.c b/src/glx/x11/dri_common.c
index 4fda649e59a..90c3d8c7d9d 100644
--- a/src/glx/x11/dri_common.c
+++ b/src/glx/x11/dri_common.c
@@ -392,6 +392,13 @@ driBindExtensions(__GLXscreenConfigs *psc, int dri2)
 	}
 #endif
 
+#ifdef __DRI2_FLUSH
+	if ((strcmp(extensions[i]->name, __DRI2_FLUSH) == 0) && dri2) {
+	    psc->f = (__DRI2flushExtension *) extensions[i];
+	    /* internal driver extension, no GL extension exposed */
+	}
+#endif
+
 	/* Ignore unknown extensions */
     }
 }
diff --git a/src/glx/x11/glxclient.h b/src/glx/x11/glxclient.h
index 3e70759a6c4..caf58bbd44a 100644
--- a/src/glx/x11/glxclient.h
+++ b/src/glx/x11/glxclient.h
@@ -519,6 +519,10 @@ struct __GLXscreenConfigsRec {
     const __DRItexBufferExtension *texBuffer;
 #endif
 
+#ifdef __DRI2_FLUSH
+    const __DRI2flushExtension *f;
+#endif
+
 #endif
 
     /**