Commit d7969cdd40fa7d02c3afd5bfe9eff9364651116e
2019-01-02T11:53:18
Vulkan: optimize image layout transitions Removes dstAccessMask being redundantly set where `GetBasicLayoutAccessFlags()` sets the same bits. Additionally, removes setting HOST_WRITE_BIT and TRANSFER_WRITE_BIT as src access mask if new layout is SHADER_READ_ONLY_OPTIMAL. The correct src access mask will be set based on the previous layout. Additionally, specializes `GetBasicLayoutAccessFlags()` in `GetSrcLayoutAccessFlags()` and `GetDstLayoutAccessFlags()` where the access mask is set correctly (and optimally) based on whether the layout is the old or the new one. This removes a few unnecessary access masks from src (for WAR hazards), and adds a few missing access masks to dst (for RAW hazards), such as VK_ACCESS_COLOR_ATTACHMENT_READ_BIT necessary for blending. Bug: angleproject:2958 Change-Id: I5870bc99c755f0444332418f998032850825aca5 Reviewed-on: https://chromium-review.googlesource.com/c/1392397 Reviewed-by: Tobin Ehlis <tobine@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>