Commit 939dc8d9750192f6fb38a02505cf4d952e1eb53f
2021-04-21T18:33:00
Vulkan: minimize-gpu-work: Skip synchronization for glMapBufferRange glMapBufferRange call requires CPU and GPU synchronization. Different drivers implement this differently. Some may choose to keep multiple copies of data to reduce the synchronization overhead while others may choose to wait for GPU access to finish to save memory. While this behavior is important, it should be looked under the scope of overall game performance and we can write a standalone test for this. When --minimize-gpu-work is specified, we mainly care about CPU overhead of driver logic of state tracking. For this purpose, we should get this out of picture in order to expose the true picture of what we intended to see. This CL always adds GL_MAP_UNSYNCHRONIZED_BIT to the access bit to avoid driver to do synchronization or make COW. Bug: b/184766477 Change-Id: I36228a4ed9913e26aa9ad4e8446fb42ee0182c18 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2847101 Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Charlie Lao <cclao@google.com>