tree e26136ff448dd03e5d0fe7db52545f67879b344e
parent 1dfceaba8f3d0fe089da02258a9445ee64008400
author Austin Eng <enga@chromium.org> 1715374057 +0000
committer Dawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1715374057 +0000

Fix SharedResourceMemory begin/end access without using texture

 - Change SetHasAccess to Resume/PauseAccess. PauseAccess returns
   the last usage serial for exporting. If the resource is not used
   it returns serial 0 (beginning of time).

 - When there are multiple concurrent readers, only acquire the
   unacquired pending fences when the last read ends.

 - Update a few tests since now, EndAccess may yield zero fences.
   This happens if the buffer is not used, and it is not the last
   concurrent read, or if there were no begin fences to forward.

Bug: 42241403
Change-Id: If43543f90a896d3c5aabaf21e788276545f67757
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/186846
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Loko Kung <lokokung@google.com>