SPIRVCross | GLSL specialization constants -> MSL

input_glsl.frag

#version 310 es
precision mediump float;

layout (constant_id = 0) const bool kSomeFlag = true;

layout(location = 0) out vec4 FragColor;
 
void main()
{
    if (kSomeFlag)
        FragColor = vec4(1.0);
    else
        FragColor = vec4(0.0);
}

output_msl.metal

/*
 * Automatically generated from input_glsl.spv.
 * cmd: `spirv-cross input_glsl.spv --msl'
 *
*/

#include <metal_stdlib>
#include <simd/simd.h>

using namespace metal;

constant bool kSomeFlag_tmp [[function_constant(0)]];
constant bool kSomeFlag = is_function_constant_defined(kSomeFlag_tmp) ? kSomeFlag_tmp : true;

struct main0_out
{
    float4 FragColor [[color(0)]];
};

fragment main0_out main0()
{
    main0_out out = {};
    if (kSomeFlag)
    {
        out.FragColor = float4(1.0);
    }
    else
    {
        out.FragColor = float4(0.0);
    }
    return out;
}