On 08.01.2017 10:55, Ryan Joseph wrote: > I’m going to attempt to translate a perlin noise function (from > https://gist.github.com/Flafla2/f0260a861be0ebdeef76) but there are a few > things that stopped me from starting. > > 1) What is & doing in this assignment? I see this many places in assignments. > > int h = hash & 15;
That's an "and". > 2) % is the mod operator in pascal right? So what is the modular assignment > %=? num = num mod repeat? > > p[x] = permutation[x%256]; > > if (repeat > 0) num %= repeat; Correct for both. > 3) Adding the tertiary operator? > > return ((h&1) == 0 ? u : -u)+((h&2) == 0 ? v : -v); if h and 1 = 0 then result := u else result := -u; if h and 2 = 0 then result := result + v else result := result - v; > Here’s an easier example. Did I do that correctly? > > if h < 8 then > u := x > else > u := y; > > double u = h < 8 /* 0b1000 */ ? x : y; > Correct. Regards, Sven _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
