glx: Only call DRI2 invalidate when necessary

We only need this when the server may have swapped the buffers or
when we receive an invalidate event from the server.  The default
behaviour is still that the DRI driver will invalidate its own buffers
when glViewport is called.

https://bugs.freedesktop.org/show_bug.cgi?id=27277

diff --git a/src/glx/dri2_glx.c b/src/glx/dri2_glx.c
index 6058c72..ca2a753 100644 (file)
--- a/src/glx/dri2_glx.c
+++ b/src/glx/dri2_glx.c
@@ -359,14 +359,6 @@ dri2WaitGL(__GLXDRIdrawable * pdraw)
 static void
 dri2FlushFrontBuffer(__DRIdrawable *driDrawable, void *loaderPrivate)
 {
-   __GLXDRIdrawablePrivate *pdraw = loaderPrivate;
-   __GLXdisplayPrivate *priv = __glXInitialize(pdraw->base.psc->dpy);
-   __GLXDRIdisplayPrivate *pdp = (__GLXDRIdisplayPrivate *)priv->dri2Display;
-
-   /* Old servers don't send invalidate events */
-   if (!pdp->invalidateAvailable)
-       dri2InvalidateBuffers(priv->dpy, pdraw->base.drawable);
-
    dri2WaitGL(loaderPrivate);
 }
 
@@ -427,16 +419,16 @@ dri2SwapBuffers(__GLXDRIdrawable *pdraw, int64_t target_msc, int64_t divisor,
        (*pdraw->psc->f->flush)(pdraw->driDrawable);
 #endif
 
-    /* Old servers don't send invalidate events */
-    if (!pdp->invalidateAvailable)
-       dri2InvalidateBuffers(dpyPriv->dpy, pdraw->drawable);
-
     /* Old servers can't handle swapbuffers */
     if (!pdp->swapAvailable) {
        dri2CopySubBuffer(pdraw, 0, 0, priv->width, priv->height);
        return 0;
     }
 
+    /* Old servers don't send invalidate events */
+    if (!pdp->invalidateAvailable)
+       dri2InvalidateBuffers(dpyPriv->dpy, pdraw->drawable);
+
 #ifdef X_DRI2SwapBuffers
     DRI2SwapBuffers(pdraw->psc->dpy, pdraw->xDrawable, target_msc, divisor,
                    remainder, &ret);