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DRI2: Synchronize the contents of the real and fake front-buffers

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Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Ian Romanick 2009-04-09 14:38:24 -07:00
parent f1a995d149
commit 567cf67959
1 changed files with 22 additions and 0 deletions
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22
hw/xfree86/dri2/dri2.c
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@ -141,6 +141,7 @@ DRI2GetBuffers(DrawablePtr pDraw, int *width, int *height,
DRI2BufferPtr buffers;
unsigned int temp_buf[32];
unsigned int *temp = temp_buf;
int have_fake_front = 0;
/* If the drawable is a window and the front-buffer is requested, silently
@ -163,6 +164,7 @@ DRI2GetBuffers(DrawablePtr pDraw, int *width, int *height,
if (attachments[i] == DRI2BufferFakeFrontLeft) {
need_fake_front--;
have_fake_front = 1;
}
temp[i] = attachments[i];
@ -171,6 +173,7 @@ DRI2GetBuffers(DrawablePtr pDraw, int *width, int *height,
if (need_fake_front > 0) {
temp[i] = DRI2BufferFakeFrontLeft;
count++;
have_fake_front = 1;
attachments = temp;
}
}
@ -195,6 +198,25 @@ DRI2GetBuffers(DrawablePtr pDraw, int *width, int *height,
*height = pPriv->height;
*out_count = pPriv->bufferCount;
/* If the client is getting a fake front-buffer, pre-fill it with the
* contents of the real front-buffer. This ensures correct operation of
* applications that call glXWaitX before calling glDrawBuffer.
*/
if (have_fake_front) {
BoxRec box;
RegionRec region;
box.x1 = 0;
box.y1 = 0;
box.x2 = pPriv->width;
box.y2 = pPriv->height;
REGION_INIT(pDraw->pScreen, &region, &box, 0);
DRI2CopyRegion(pDraw, &region, DRI2BufferFakeFrontLeft,
DRI2BufferFrontLeft);
}
return pPriv->buffers;
}