grad()

fl::i32 fl::perlin_s16x16::grad ( int hash, fl::i32 x, fl::i32 y )

static

Definition at line 83 of file perlin_s16x16.cpp.hpp.

                                                     {
    struct GradCoeff { fl::i8 cx; fl::i8 cy; };
    constexpr GradCoeff lut[16] = {
        { 1,  1}, {-1,  1}, { 1, -1}, {-1, -1},
        { 1,  0}, {-1,  0}, { 1,  0}, {-1,  0},
        { 0,  1}, { 0, -1}, { 0,  1}, { 0, -1},
        { 1,  1}, { 0, -1}, {-1,  1}, { 0, -1},
    };
    const GradCoeff &g = lut[hash & 15];
    return g.cx * x + g.cy * y;
}

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

Referenced by pnoise2d_raw(), and fl::perlin_s16x16_simd::pnoise2d_raw_simd4_vec().

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