tree b0ec240753fbaf8693970a8a4c7a006e94736865
parent f874525de394e50f98b71df74134f9d2dcf987e4
author Austin Eng <enga@chromium.org> 1590681904 +0000
committer Commit Bot service account <commit-bot@chromium.org> 1590681904 +0000

Add ScopedEnvironmentVar class for setting env variables in BackendVk

In the Vulkan backend, we only need to set VK_LAYER_PATH and
VK_ICD_FILENAMES while we're gathering the device information. After
this, we should unset the environment variables or they will persist
and affect loading Vulkan again (from Dawn or another client) in the
future.

Bug: dawn:406
Change-Id: I30c38b0980e181126fcd7fa911bbf9e8aa35f3b8
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/22021
Reviewed-by: Stephen White <senorblanco@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>