SPIRV-Cross/reference/shaders-hlsl-no-opt/comp/bitfield.comp

uint SPIRV_Cross_bitfieldInsert(uint Base, uint Insert, uint Offset, uint Count)
{
    uint Mask = Count == 32 ? 0xffffffff : (((1u << Count) - 1) << (Offset & 31));
    return (Base & ~Mask) | ((Insert << Offset) & Mask);
}

uint2 SPIRV_Cross_bitfieldInsert(uint2 Base, uint2 Insert, uint Offset, uint Count)
{
    uint Mask = Count == 32 ? 0xffffffff : (((1u << Count) - 1) << (Offset & 31));
    return (Base & ~Mask) | ((Insert << Offset) & Mask);
}

uint3 SPIRV_Cross_bitfieldInsert(uint3 Base, uint3 Insert, uint Offset, uint Count)
{
    uint Mask = Count == 32 ? 0xffffffff : (((1u << Count) - 1) << (Offset & 31));
    return (Base & ~Mask) | ((Insert << Offset) & Mask);
}

uint4 SPIRV_Cross_bitfieldInsert(uint4 Base, uint4 Insert, uint Offset, uint Count)
{
    uint Mask = Count == 32 ? 0xffffffff : (((1u << Count) - 1) << (Offset & 31));
    return (Base & ~Mask) | ((Insert << Offset) & Mask);
}

uint SPIRV_Cross_bitfieldUExtract(uint Base, uint Offset, uint Count)
{
    uint Mask = Count == 32 ? 0xffffffff : ((1 << Count) - 1);
    return (Base >> Offset) & Mask;
}

uint2 SPIRV_Cross_bitfieldUExtract(uint2 Base, uint Offset, uint Count)
{
    uint Mask = Count == 32 ? 0xffffffff : ((1 << Count) - 1);
    return (Base >> Offset) & Mask;
}

uint3 SPIRV_Cross_bitfieldUExtract(uint3 Base, uint Offset, uint Count)
{
    uint Mask = Count == 32 ? 0xffffffff : ((1 << Count) - 1);
    return (Base >> Offset) & Mask;
}

uint4 SPIRV_Cross_bitfieldUExtract(uint4 Base, uint Offset, uint Count)
{
    uint Mask = Count == 32 ? 0xffffffff : ((1 << Count) - 1);
    return (Base >> Offset) & Mask;
}

int SPIRV_Cross_bitfieldSExtract(int Base, int Offset, int Count)
{
    int Mask = Count == 32 ? -1 : ((1 << Count) - 1);
    int Masked = (Base >> Offset) & Mask;
    int ExtendShift = (32 - Count) & 31;
    return (Masked << ExtendShift) >> ExtendShift;
}

int2 SPIRV_Cross_bitfieldSExtract(int2 Base, int Offset, int Count)
{
    int Mask = Count == 32 ? -1 : ((1 << Count) - 1);
    int2 Masked = (Base >> Offset) & Mask;
    int ExtendShift = (32 - Count) & 31;
    return (Masked << ExtendShift) >> ExtendShift;
}

int3 SPIRV_Cross_bitfieldSExtract(int3 Base, int Offset, int Count)
{
    int Mask = Count == 32 ? -1 : ((1 << Count) - 1);
    int3 Masked = (Base >> Offset) & Mask;
    int ExtendShift = (32 - Count) & 31;
    return (Masked << ExtendShift) >> ExtendShift;
}

int4 SPIRV_Cross_bitfieldSExtract(int4 Base, int Offset, int Count)
{
    int Mask = Count == 32 ? -1 : ((1 << Count) - 1);
    int4 Masked = (Base >> Offset) & Mask;
    int ExtendShift = (32 - Count) & 31;
    return (Masked << ExtendShift) >> ExtendShift;
}

void comp_main()
{
    int signed_value = 0;
    uint unsigned_value = 0u;
    int3 signed_values = int3(0, 0, 0);
    uint3 unsigned_values = uint3(0u, 0u, 0u);
    int s = SPIRV_Cross_bitfieldSExtract(signed_value, 5, 20);
    uint u = SPIRV_Cross_bitfieldUExtract(unsigned_value, 6, 21);
    s = int(SPIRV_Cross_bitfieldInsert(s, 40, 5, 4));
    u = SPIRV_Cross_bitfieldInsert(u, 60u, 5, 4);
    u = reversebits(u);
    s = reversebits(s);
    int v0 = int(countbits(u));
    int v1 = countbits(s);
    int v2 = int(firstbithigh(u));
    int v3 = firstbitlow(s);
    int3 s_1 = SPIRV_Cross_bitfieldSExtract(signed_values, 5, 20);
    uint3 u_1 = SPIRV_Cross_bitfieldUExtract(unsigned_values, 6, 21);
    s_1 = int3(SPIRV_Cross_bitfieldInsert(s_1, int3(40, 40, 40), 5, 4));
    u_1 = SPIRV_Cross_bitfieldInsert(u_1, uint3(60u, 60u, 60u), 5, 4);
    u_1 = reversebits(u_1);
    s_1 = reversebits(s_1);
    int3 v0_1 = int3(countbits(u_1));
    int3 v1_1 = countbits(s_1);
    int3 v2_1 = int3(firstbithigh(u_1));
    int3 v3_1 = firstbitlow(s_1);
}

[numthreads(1, 1, 1)]
void main()
{
    comp_main();
}