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st/dri: manually swap MSAA front and back buffers in SwapBuffers 

Reviewed-by: Brian Paul <brianp@vmware.com>
This commit is contained in:
Marek Olšák 2013-05-31 22:48:48 +02:00
parent b77316ad75
commit 3b525036b9
1 changed files with 25 additions and 0 deletions
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25
src/gallium/state_trackers/dri/common/dri_drawable.c
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@ -414,6 +414,7 @@ dri_flush(__DRIcontext *cPriv,
struct dri_context *ctx = dri_context(cPriv);
struct dri_drawable *drawable = dri_drawable(dPriv);
unsigned flush_flags;
boolean swap_msaa_buffers = FALSE;
if (!ctx) {
assert(0);
@ -440,6 +441,12 @@ dri_flush(__DRIcontext *cPriv,
drawable->textures[ST_ATTACHMENT_BACK_LEFT],
drawable->msaa_textures[ST_ATTACHMENT_BACK_LEFT]);
if (reason == __DRI2_THROTTLE_SWAPBUFFER &&
drawable->msaa_textures[ST_ATTACHMENT_FRONT_LEFT] &&
drawable->msaa_textures[ST_ATTACHMENT_BACK_LEFT]) {
swap_msaa_buffers = TRUE;
}
/* FRONT_LEFT is resolved in drawable->flush_frontbuffer. */
}
@ -494,6 +501,24 @@ dri_flush(__DRIcontext *cPriv,
if (drawable) {
drawable->flushing = FALSE;
}
/* Swap the MSAA front and back buffers, so that reading
* from the front buffer after SwapBuffers returns what was
* in the back buffer.
*/
if (swap_msaa_buffers) {
struct pipe_resource *tmp =
drawable->msaa_textures[ST_ATTACHMENT_FRONT_LEFT];
drawable->msaa_textures[ST_ATTACHMENT_FRONT_LEFT] =
drawable->msaa_textures[ST_ATTACHMENT_BACK_LEFT];
drawable->msaa_textures[ST_ATTACHMENT_BACK_LEFT] = tmp;
/* Now that we have swapped the buffers, this tells the state
* tracker to revalidate the framebuffer.
*/
p_atomic_inc(&drawable->base.stamp);
}
}
/**