| commit | 68173c80915955bae8cfc697a98d5d7888f09c67 | [log] [tgz] |
|---|---|---|
| author | Steven Perron <stevenperron@google.com> | Wed Jul 02 12:09:47 2025 -0400 |
| committer | GitHub <noreply@github.com> | Wed Jul 02 12:09:47 2025 -0400 |
| tree | f5df995faacc69a211daff2ac0c0413933a6d9a5 | |
| parent | 1c305f711f860246b9dd60211166afbf3b3d48cd [diff] |
[HLSL][SPRIV] Handle signed RWBuffer correctly (#144774)
In Vulkan, the signedness of the accesses to images has to match the
signedness of the backing image.
See
https://docs.vulkan.org/spec/latest/chapters/textures.html#textures-input,
where it says the behaviour is undefined if
> the signedness of any read or sample operation does not match the
signedness of the image’s format.
Users who define say an `RWBuffer<int>` will create a Vulkan image with
a signed integer format. So the HLSL that is generated must match that
expecation.
The solution we use is to generate a `spirv.SignedImage` target type for
signed integer instead of `spirv.Image`. The two types are otherwise the
same.
The backend will add the `signExtend` image operand to access to the
image to ensure the image is access as a signed image.
Fixes #144580
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