DRI2: Synchronize the contents of the real and fake front-buffers
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
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@ -141,6 +141,7 @@ DRI2GetBuffers(DrawablePtr pDraw, int *width, int *height,
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DRI2BufferPtr buffers;
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unsigned int temp_buf[32];
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unsigned int *temp = temp_buf;
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int have_fake_front = 0;
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/* If the drawable is a window and the front-buffer is requested, silently
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@ -163,6 +164,7 @@ DRI2GetBuffers(DrawablePtr pDraw, int *width, int *height,
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if (attachments[i] == DRI2BufferFakeFrontLeft) {
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need_fake_front--;
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have_fake_front = 1;
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}
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temp[i] = attachments[i];
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@ -171,6 +173,7 @@ DRI2GetBuffers(DrawablePtr pDraw, int *width, int *height,
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if (need_fake_front > 0) {
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temp[i] = DRI2BufferFakeFrontLeft;
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count++;
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have_fake_front = 1;
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attachments = temp;
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}
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}
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@ -195,6 +198,25 @@ DRI2GetBuffers(DrawablePtr pDraw, int *width, int *height,
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*height = pPriv->height;
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*out_count = pPriv->bufferCount;
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/* If the client is getting a fake front-buffer, pre-fill it with the
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* contents of the real front-buffer. This ensures correct operation of
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* applications that call glXWaitX before calling glDrawBuffer.
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*/
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if (have_fake_front) {
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BoxRec box;
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RegionRec region;
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box.x1 = 0;
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box.y1 = 0;
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box.x2 = pPriv->width;
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box.y2 = pPriv->height;
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REGION_INIT(pDraw->pScreen, ®ion, &box, 0);
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DRI2CopyRegion(pDraw, ®ion, DRI2BufferFakeFrontLeft,
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DRI2BufferFrontLeft);
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}
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return pPriv->buffers;
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}
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