grad16() [3/3]

static int16_t grad16 ( uint8_t hash, int16_t x, int16_t y, int16_t z )

inlinestatic

Definition at line 133 of file noise.cpp.

                                                                                                            {
#if 0
    switch(hash & 0xF) {
        case  0: return (( x) + ( y))>>1;
        case  1: return ((-x) + ( y))>>1;
        case  2: return (( x) + (-y))>>1;
        case  3: return ((-x) + (-y))>>1;
        case  4: return (( x) + ( z))>>1;
        case  5: return ((-x) + ( z))>>1;
        case  6: return (( x) + (-z))>>1;
        case  7: return ((-x) + (-z))>>1;
        case  8: return (( y) + ( z))>>1;
        case  9: return ((-y) + ( z))>>1;
        case 10: return (( y) + (-z))>>1;
        case 11: return ((-y) + (-z))>>1;
        case 12: return (( y) + ( x))>>1;
        case 13: return ((-y) + ( z))>>1;
        case 14: return (( y) + (-x))>>1;
        case 15: return ((-y) + (-z))>>1;
    }
#else
    hash = hash&15;
    int16_t u = hash<8?x:y;
    int16_t v = hash<4?y:hash==12||hash==14?x:z;
    if(hash&1) { u = -u; }
    if(hash&2) { v = -v; }
 
    return AVG15(u,v);
#endif
}

References x, y, and z.

Referenced by inoise16_raw(), inoise16_raw(), inoise16_raw(), and inoise16_raw().

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