#pragma clang diagnostic ignored "-Wmissing-prototypes"

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

using namespace metal;

// Implementation of the GLSL mod() function, which is slightly different than Metal fmod()
template<typename Tx, typename Ty>
inline Tx mod(Tx x, Ty y)
{
    return x - y * floor(x / y);
}

// Implementation of signed integer mod accurate to SPIR-V specification
template<typename Tx, typename Ty>
inline Tx spvSMod(Tx x, Ty y)
{
    Tx remainder = x - y * (x / y);
    return select(Tx(remainder + y), remainder, remainder == 0 || (x >= 0) == (y >= 0));
}

struct myBlock
{
    int a;
    float b[1];
};

static inline __attribute__((always_inline))
float getB(device myBlock& myStorage, thread uint3& gl_GlobalInvocationID)
{
    return myStorage.b[gl_GlobalInvocationID.x];
}

kernel void main0(device myBlock& myStorage [[buffer(0)]], uint3 gl_GlobalInvocationID [[thread_position_in_grid]])
{
    myStorage.a = spvSMod(myStorage.a + 1, 256);
    myStorage.b[gl_GlobalInvocationID.x] = mod(getB(myStorage, gl_GlobalInvocationID) + 0.0199999995529651641845703125, 1.0);
}

