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st/dri: Perform MSAA downsampling for __DRI2_THROTTLE_COPYSUBBUFFER

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glXCopySubBufferMESA copies data from the back buffer to the front,
so it needs to perform a MSAA downsampling operation just like
glXSwapBuffers would.

Currently, the CopySubBuffer implementations supply a throttle reason
of __DRI2_THROTTLE_SWAPBUFFERS, so they hit this path and work today.
But we'd like to avoid swapbuffer throttling in this case, so the next
patch will change that reason.

Tested-by: Michel Dänzer <mdaenzer@redhat.com> # DRI3 only
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
This commit is contained in:
Kenneth Graunke
2019-10-03 12:11:22 -04:00
parent 6309c31fd8
commit 72beda4fb4
1 changed files with 4 additions and 2 deletions
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src/gallium/state_trackers/dri/dri_drawable.c
+4 -2
View File
@@ -511,13 +511,15 @@ dri_flush(__DRIcontext *cPriv,
struct pipe_context *pipe = st->pipe;
if (drawable->stvis.samples > 1 &&
reason == __DRI2_THROTTLE_SWAPBUFFER) {
(reason == __DRI2_THROTTLE_SWAPBUFFER ||
reason == __DRI2_THROTTLE_COPYSUBBUFFER)) {
/* Resolve the MSAA back buffer. */
dri_pipe_blit(st->pipe,
drawable->textures[ST_ATTACHMENT_BACK_LEFT],
drawable->msaa_textures[ST_ATTACHMENT_BACK_LEFT]);
if (drawable->msaa_textures[ST_ATTACHMENT_FRONT_LEFT] &&
if (reason == __DRI2_THROTTLE_SWAPBUFFER &&
drawable->msaa_textures[ST_ATTACHMENT_FRONT_LEFT] &&
drawable->msaa_textures[ST_ATTACHMENT_BACK_LEFT]) {
swap_msaa_buffers = true;
}