This allows ddx to set swap_limit if there is more than one back buffer for drawable. Setting swap_limit has to also check if change affects a client that is blocked.
This can be used to implement N-buffering in driver with minimal logic in allocation and selecting next back. Signed-off-by: Pauli Nieminen <[email protected]> Tested-by: Francisco Jerez <[email protected]> CC: Kristian Høgsberg <[email protected]> CC: Jesse Barnes <[email protected]> --- hw/xfree86/dri2/dri2.c | 23 +++++++++++++++++++++++ hw/xfree86/dri2/dri2.h | 1 + 2 files changed, 24 insertions(+), 0 deletions(-) diff --git a/hw/xfree86/dri2/dri2.c b/hw/xfree86/dri2/dri2.c index 34f735f..c96eb35 100644 --- a/hw/xfree86/dri2/dri2.c +++ b/hw/xfree86/dri2/dri2.c @@ -190,6 +190,29 @@ DRI2AllocateDrawable(DrawablePtr pDraw) return pPriv; } +Bool +DRI2SwapLimit(DrawablePtr pDraw, int swap_limit) +{ + DRI2DrawablePtr pPriv = DRI2GetDrawable(pDraw); + if (!pPriv) + return FALSE; + + pPriv->swap_limit = swap_limit; + + /* Check throttling */ + if (pPriv->swapsPending >= pPriv->swap_limit) + return TRUE; + + if (pPriv->target_sbc == -1 && !pPriv->blockedOnMsc) { + if (pPriv->blockedClient) { + AttendClient(pPriv->blockedClient); + pPriv->blockedClient = NULL; + } + } + + return TRUE; +} + typedef struct DRI2DrawableRefRec { XID id; XID dri2_id; diff --git a/hw/xfree86/dri2/dri2.h b/hw/xfree86/dri2/dri2.h index fe0bf6c..0e0bea4 100644 --- a/hw/xfree86/dri2/dri2.h +++ b/hw/xfree86/dri2/dri2.h @@ -251,6 +251,7 @@ extern _X_EXPORT DRI2BufferPtr *DRI2GetBuffersWithFormat(DrawablePtr pDraw, int *out_count); extern _X_EXPORT void DRI2SwapInterval(DrawablePtr pDrawable, int interval); +extern _X_EXPORT Bool DRI2SwapLimit(DrawablePtr pDraw, int swap_limit); extern _X_EXPORT int DRI2SwapBuffers(ClientPtr client, DrawablePtr pDrawable, CARD64 target_msc, CARD64 divisor, CARD64 remainder, CARD64 *swap_target, -- 1.7.0.4
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