tree 3ec552f70ae34ddf4253bd891002f40c2271fc91
parent 4110684aa07a1443dcd6b40e219baf4314210dd5
author Hao Li <hao.x.li@intel.com> 1609814358 +0000
committer Commit Bot service account <commit-bot@chromium.org> 1609814358 +0000

Get timestamp period from device

- Get timestamp period on each backend
  D3D12: Get GPU frequency(HZ) from queue and calculate the period in ns
  Vulkan: Get timestampPeriod from device properties
  Metal and others: don't need the period

Bug: dawn:434
Change-Id: Ia5588a3dccadfe92d7384b9fdf1e6848c6e5c6e2
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/36220
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Hao Li <hao.x.li@intel.com>