Stephen White 76cd4332cc Vulkan: enable frag shader placeholder.
The Vulkan spec mandates the use of a fragment shader unless
rasterizer discard is enabled. For now, enable the placeholder
fragment shader in all cases, with a bug logged to optimize it
for the rasterizer discard case.

Bug: dawn:1696 dawn:1698
Change-Id: I9e85e6308a9952fc505382488c618897bd9abc7b
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/123503
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Stephen White <senorblanco@chromium.org>
2023-03-10 19:20:15 +00:00
..