grad8() [2/3]

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

inlinestatic

Definition at line 229 of file noise.cpp.hpp.

{
    // 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;
 
    fl::i8 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 fl::avg7(u,v);
}

References FL_NO_EXCEPT, x, and y.