grad()

FASTLED_FORCE_INLINE float fl::grad	(	int	hash,
		float	x,
		float	y,
		float	z )

Definition at line 55 of file perlin_float.h.

                                                                     {
    int h = hash & 15;       /* CONVERT LO 4 BITS OF HASH CODE */
    float u = h < 8 ? x : y, /* INTO 12 GRADIENT DIRECTIONS.   */
        v = h < 4                ? y
            : h == 12 || h == 14 ? x
                                 : z;
    return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);
}

References FASTLED_FORCE_INLINE, x, y, and z.

Referenced by fl::anonymous_namespace{wave.cpp.hpp}::BatchDraw::BatchDraw(), fl::FlowFieldFloat::Perlin2D::noise(), and pnoise().

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