There isn't API that allows application atomically query for msc changes and schedule swaps. If msc changes dramatically between query and scheduling application would schedule swap to happen at wrong time.
Because of API limitations driver has to make msc increment for each vblank affecting the drawable. Signed-off-by: Pauli Nieminen <ext-pauli.niemi...@nokia.com> CC: Jesse Barnes <jbar...@virtuousgeek.org> CC: Mario Kleiner <mario.klei...@tuebingen.mpg.de> --- hw/xfree86/dri2/dri2.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) diff --git a/hw/xfree86/dri2/dri2.c b/hw/xfree86/dri2/dri2.c index e4693d9..9379433 100644 --- a/hw/xfree86/dri2/dri2.c +++ b/hw/xfree86/dri2/dri2.c @@ -832,9 +832,12 @@ DRI2SwapBuffers(ClientPtr client, DrawablePtr pDraw, CARD64 target_msc, if (!(*ds->GetMSC)(pDraw, &ust, ¤t_msc)) pPriv->last_swap_target = 0; - if (current_msc < pPriv->last_swap_target) + if (current_msc < pPriv->last_swap_target) { pPriv->last_swap_target = current_msc; - + xf86DrvMsgVerb(pScreen->myNum, X_WARNING, 3, + "[DRI2] %s: GetMSC returned swap count that is in " + "past. Working around driver bug.\n", __func__); + } } /* -- 1.7.0.4 _______________________________________________ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel