grad() [2/4]

static fl::i32 grad ( fl::u8 hash, fl::i32 x, fl::i32 y )

static

Definition at line 84 of file simplex.cpp.hpp.

                                                            {
    fl::u8 h = hash & 7;      // Convert low 3 bits of hash code
    fl::i32 u = h < 4 ? x : y; // into 8 simple gradient directions,
    fl::i32 v = h < 4 ? y : x; // and compute the dot product with (x,y).
    return ((h&1) != 0 ? -u : u) + ((h&2) != 0 ? -2*v : 2*v);
}

References FL_NO_EXCEPT, x, and y.