tree b4479459978fb5c8defd6d21cccc484424631a29
parent 9efc4fcc897291b9a663d545ca7fcb3b12bea3b9
author Ben Clayton <bclayton@google.com> 1624050925 +0000
committer Ben Clayton <bclayton@google.com> 1624050925 +0000

writer/hlsl: Emit UBO as an array of vector

Instead of a ConstantBuffer.

HLSL requires that each structure field in a UBO is 16 byte aligned.
WGSL has much looser constraints with its UBO field alignment rules.

Instead generate an array of uint4 vectors, and index into this, much
like we index into [RW]ByteAddressBuffers for SSBOs.

Extend the DecomposeStorageAccess transform to support uniforms too.
This has been renamed to DecomposeMemoryAccess.

Change-Id: I3868ff80af1ab3b3dddfbf5b969724cb87ef0744
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/55246
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: David Neto <dneto@google.com>