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53ec86ab
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2024-12-17T14:40:31
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WGSL: support small stride arrays in uniforms
WGSL requires arrays in the uniform address space to have a stride
a multiple of 16.
This CL makes WGSL translator emit wrapper structs for array element
types used in the uniform address space, when the array stride is
not a multiple of 16. The exception is for structs that aren't
an aligned size of 16n, and for any types matCx2, since they are
(or will be) handled in different ways that ensure alignment to 16.
This should leave only f32, i32, u32, and vec2.
See https://www.w3.org/TR/WGSL/#example-67da5de6 for an example
of using a wrapper struct.
This requires converting arrays with a wrapper struct element type
to arrays with an unwrapped element type when they are first used;
this can be "optimized" later for the common case of accessing a
single array element, which can then be unwrapped immediately. This
CL generates WGSL conversion functions when necessary.
After this, the only types that can't yet be used in a uniform
are matCx2 and bools.
This is #2 in
https://docs.google.com/document/d/17Qku1QEbLDhvJS-JJ9lPQAbnuZtLxWhG-ha5eCUhtEY/edit?tab=t.0#bookmark=id.rt3slgehd4te
Bug: angleproject:376553328
Change-Id: I1edfa7f481a6cbf5b595643aae8728e67bc4b770
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6092038
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Liza Burakova <liza@chromium.org>
Reviewed-by: Matt Denton <mpdenton@google.com>
Commit-Queue: Matt Denton <mpdenton@google.com>
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