reference/shaders-msl/vert/no-contraction.vert

#pragma clang diagnostic ignored "-Wmissing-prototypes"

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

using namespace metal;

struct main0_out
{
    float4 gl_Position [[position]];
};

struct main0_in
{
    float4 vA [[attribute(0)]];
    float4 vB [[attribute(1)]];
    float4 vC [[attribute(2)]];
};

template<typename T>
[[clang::optnone]] T spvFMul(T l, T r)
{
    return fma(l, r, T(0));
}

template<typename T, int Cols, int Rows>
[[clang::optnone]] vec<T, Cols> spvFMulVectorMatrix(vec<T, Rows> v, matrix<T, Cols, Rows> m)
{
    vec<T, Cols> res = vec<T, Cols>(0);
    for (uint i = Rows; i > 0; --i)
    {
        vec<T, Cols> tmp(0);
        for (uint j = 0; j < Cols; ++j)
        {
            tmp[j] = m[j][i - 1];
        }
        res = fma(tmp, vec<T, Cols>(v[i - 1]), res);
    }
    return res;
}

template<typename T, int Cols, int Rows>
[[clang::optnone]] vec<T, Rows> spvFMulMatrixVector(matrix<T, Cols, Rows> m, vec<T, Cols> v)
{
    vec<T, Rows> res = vec<T, Rows>(0);
    for (uint i = Cols; i > 0; --i)
    {
        res = fma(m[i - 1], vec<T, Rows>(v[i - 1]), res);
    }
    return res;
}

template<typename T, int LCols, int LRows, int RCols, int RRows>
[[clang::optnone]] matrix<T, RCols, LRows> spvFMulMatrixMatrix(matrix<T, LCols, LRows> l, matrix<T, RCols, RRows> r)
{
    matrix<T, RCols, LRows> res;
    for (uint i = 0; i < RCols; i++)
    {
        vec<T, RCols> tmp(0);
        for (uint j = 0; j < LCols; j++)
        {
            tmp = fma(vec<T, RCols>(r[i][j]), l[j], tmp);
        }
        res[i] = tmp;
    }
    return res;
}

template<typename T>
[[clang::optnone]] T spvFAdd(T l, T r)
{
    return fma(T(1), l, r);
}

template<typename T>
[[clang::optnone]] T spvFSub(T l, T r)
{
    return fma(T(-1), r, l);
}

vertex main0_out main0(main0_in in [[stage_in]])
{
    main0_out out = {};
    float4 mul = spvFMul(in.vA, in.vB);
    float4 add = spvFAdd(in.vA, in.vB);
    float4 sub = spvFSub(in.vA, in.vB);
    float4 mad = spvFAdd(spvFMul(in.vA, in.vB), in.vC);
    float4 summed = spvFAdd(spvFAdd(spvFAdd(mul, add), sub), mad);
    out.gl_Position = summed;
    return out;
}