grad8() [2/3]

static int8_t grad8 ( uint8_t hash, int8_t x, int8_t y )

inlinestatic

Definition at line 213 of file noise.cpp.

{
    // since the tests below can be done bit-wise on the bottom
    // three bits, there's no need to mask off the higher bits
    //  hash = hash & 7;
 
    int8_t u,v;
    if( hash & 4) {
        u = y; v = x;
    } else {
        u = x; v = y;
    }
 
    if(hash&1) { u = -u; }
    if(hash&2) { v = -v; }
 
    return avg7(u,v);
}

References avg7(), x, and y.

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