Use of specialization constants in zig shaders

Help
,
1

I need to be able to use specialization constants in my zig shader, and am currently unable to figure out how to do so.

glsl I am trying to replicate:

layout(constant_id = 0) const uint spec_const = 0;
1 Like
SPIR-V Backend Progress Devlog
2

inline asm can do the job. i think im gonna add something like this to std.spirv

pub fn specConst(T: type, comptime spec_id: u32) T {
    return asm volatile (
        \\%ret = OpSpecConstant %ty 0
        \\OpDecorate %ret SpecId $spec_id
        : [ret] "" (-> T),
        : [ty] "t" (T),
          [spec_id] "c" (spec_id),
    );
}

export fn main() callconv(.kernel) void {
    _ = specConst(u32, 0);
}