grad_i16()

FASTLED_FORCE_INLINE fl::i32 fl::perlin_i16_optimized::grad_i16 ( int hash, fl::i16 x, fl::i16 y )

staticprivate

Definition at line 89 of file perlin_i16_optimized.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];
    // i8 × i16 → i32 (safe, result in range ±65535)
    return static_cast<fl::i32>(g.cx * x) + static_cast<fl::i32>(g.cy * y);
}

References FASTLED_FORCE_INLINE, fl::FL_NO_EXCEPT, fl::g, fl::x, and fl::y.

Referenced by pnoise2d_raw().

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