xserver and xkeyboard-config git update 19/6/2010

1 files changed, 15 insertions, 0 deletions

diff --git a/xorg-server/hw/xfree86/dri2/dri2.c b/xorg-server/hw/xfree86/dri2/dri2.c
index 123bc3225..fbed587c2 100644
--- a/xorg-server/hw/xfree86/dri2/dri2.c
+++ b/xorg-server/hw/xfree86/dri2/dri2.c
@@ -759,6 +759,7 @@ DRI2SwapBuffers(ClientPtr client, DrawablePtr pDraw, CARD64 target_msc,
     DRI2DrawablePtr pPriv;

     DRI2BufferPtr   pDestBuffer = NULL, pSrcBuffer = NULL;

     int             ret, i;

+    CARD64          ust, current_msc;

 

     pPriv = DRI2GetDrawable(pDraw);

     if (pPriv == NULL) {

@@ -803,12 +804,26 @@ DRI2SwapBuffers(ClientPtr client, DrawablePtr pDraw, CARD64 target_msc,
      * need to schedule a swap for the last swap target + the swap interval.

      */

     if (target_msc == 0 && divisor == 0 && remainder == 0) {

+	/* If the current vblank count of the drawable's crtc is lower

+	 * than the count stored in last_swap_target from a previous swap

+	 * then reinitialize last_swap_target to the current crtc's msc,

+	 * otherwise the swap will hang. This will happen if the drawable

+	 * is moved to a crtc with a lower refresh rate, or a crtc that just

+	 * got enabled.

+	 */

+	if (!(*ds->GetMSC)(pDraw, &ust, &current_msc))

+	    pPriv->last_swap_target = 0;

+

+	if (current_msc < pPriv->last_swap_target)

+	    pPriv->last_swap_target = current_msc;

+

 	/*

 	 * Swap target for this swap is last swap target + swap interval since

 	 * we have to account for the current swap count, interval, and the

 	 * number of pending swaps.

 	 */

 	*swap_target = pPriv->last_swap_target + pPriv->swap_interval;

+

     } else {

 	/* glXSwapBuffersMscOML could have a 0 target_msc, honor it */

 	*swap_target = target_msc;