[glsl-in] push constant in fragment shader compile failed

[Latias94]

shader.frag

#version 450

layout (location = 0) in vec3 fragColor;

layout (location = 0) out vec4 outColor;

layout (push_constant) uniform PushConstants {
    layout (offset = 64) float opacity;
} pcs;

void main() {
    outColor = vec4(fragColor, pcs.opacity);
}

❯ glslangValidator.exe -V .\shader.frag -o .\shader.frag.spv
.\shader.frag

❯ naga .\shader.frag .\shader.frag.spv
error: Expected Void, Struct or a type, found Layout
  ┌─ shader.frag:8:5
  │
8 │     layout (offset = 64) float opacity;
  │     ^^^^^^

Push constant in vertex shader compile successfully but not in fragment shader.

[JCapucho]

The glsl frontend currently doesn't parse type qualifiers for block declarations members

https://github.com/gfx-rs/naga/blob/0074c68ec4f435c5dc0ba6d62ff567c1f146e9ec/src/front/glsl/parser/declarations.rs#L618-L629

Push constant in vertex shader compile successfully but not in fragment shader.

I assume that the vertex shader doesn't have any decorations otherwise it should also not compile.

[Latias94]

Is it a low priority TODO?

[JCapucho]

Is it a low priority TODO?

The glsl frontend is something I and others do on our free time, or they contribute to solve their specific needs, so there's no real priority between issues and new features.

But if you or someone else wants to try and fix it I'm happy to provide guidance :)