grad3d()

fl::i32 fl::perlin_s16x16::grad3d ( int hash, fl::i32 x, fl::i32 y, fl::i32 z )

static

Definition at line 140 of file perlin_s16x16.cpp.hpp.

                                                               {
    // Matches float grad(hash, x, y, z) from perlin_float.h:
    //   h = hash & 15
    //   u = h < 8 ? x : y
    //   v = h < 4 ? y : (h == 12 || h == 14 ? x : z)
    //   return ((h&1)==0 ? u : -u) + ((h&2)==0 ? v : -v)
    int h = hash & 15;
    fl::i32 u = h < 8 ? x : y;
    fl::i32 v = h < 4 ? y : (h == 12 || h == 14 ? x : z);
    return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);
}

References fl::x, fl::y, and z.

Referenced by pnoise3d_raw().

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