bc_shader_utils.h

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/*
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#ifndef __BC_METAL_SHADER_UTILS_H__
#define __BC_METAL_SHADER_UTILS_H__
 
#include <metal_stdlib>
using namespace metal;
 
static inline void nonlinear_index(int idx, int lx, thread int *index) {
    const int idx2 = idx - 1;
    index[3] = idx2 / (lx * lx * lx);
    index[2] = (idx2 - (lx * lx * lx) * index[3]) / (lx * lx);
    index[1] = (idx2 - (lx * lx * lx) * index[3] - (lx * lx) * index[2]) / lx;
    index[0] = idx2 - (lx * lx * lx) * index[3]
                     - (lx * lx) * index[2]
                     - lx * index[1];
    index[0]++;
    index[1]++;
    index[2]++;
    index[3]++;
}
 
static inline int coef_normal_area_idx(int i, int j, int k,
                                       int l, int lx, int nf) {
    return (i + lx * ((j - 1) + lx * ((k - 1) + nf * (l - 1)))) - 1;
}
 
#endif /* __BC_METAL_SHADER_UTILS_H__ */