grad8() [3/3]

static fl::i8 grad8 ( fl::u8 hash, fl::i8 x, fl::i8 y, fl::i8 z )

inlinestatic

Definition at line 203 of file noise.cpp.hpp.

                                                                                                         {
    // Industry-standard 3D Perlin noise gradient implementation
    // Uses proper 12 edge vectors of a cube for maximum range coverage
    
    switch(hash & 0xF) {
        case  0: return fl::avg7( x,  y);  // (1,1,0)
        case  1: return fl::avg7(-x,  y);  // (-1,1,0)
        case  2: return fl::avg7( x, -y);  // (1,-1,0)
        case  3: return fl::avg7(-x, -y);  // (-1,-1,0)
        case  4: return fl::avg7( x,  z);  // (1,0,1)
        case  5: return fl::avg7(-x,  z);  // (-1,0,1)
        case  6: return fl::avg7( x, -z);  // (1,0,-1)
        case  7: return fl::avg7(-x, -z);  // (-1,0,-1)
        case  8: return fl::avg7( y,  z);  // (0,1,1)
        case  9: return fl::avg7(-y,  z);  // (0,-1,1)
        case 10: return fl::avg7( y, -z);  // (0,1,-1)
        case 11: return fl::avg7(-y, -z);  // (0,-1,-1)
        // Repeat first 4 for hash values 12-15 (proper wrap-around)
        case 12: return fl::avg7( x,  y);  // (1,1,0)
        case 13: return fl::avg7(-x,  y);  // (-1,1,0)
        case 14: return fl::avg7( x, -y);  // (1,-1,0)
        case 15: return fl::avg7(-x, -y);  // (-1,-1,0)
    }
    return 0; // Should never reach here
}

References FL_NO_EXCEPT, x, y, and z.

Referenced by inoise8_raw(), inoise8_raw(), and inoise8_raw().

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