From the original SynthMaker forum (2004–2014), with its members’ names and dates.
spoonboiler ·
hi; i am having a terrible time translating this:
p += dp; if(p < 0.0) { p = -p; dp = -dp; } else if(p > pmax) { p = pmax + pmax - p; dp = -dp; }
i can do a simple if/else, but an if/elseIf is killing me 😆 maybe i'm just tired? but i could sure do with some help. i am also wondering if i would need to do all this twice, because of the two dos inside the curly braces... help? 😀 thanx all.
Shifrin ·
spoonboiler wrote: hi; i am having a terrible time translating this:
You could try :-
float pLT0; float pGTpmax; float pUC;
p = p + dp;
pLT0 = p < 0.0; pGTpmax = p > pmax; pUC = (P >= 0.0)&(p <= pmax);
p = pLT0&(-1*p) + pGTpmax&(pmax + pmax - p) + pUC&p; dp = (pLT0|pGTpmax)&(-1*dp) + pUC&dp;
I couldn't remember if S|M supported syntax like -p so I wrote -1*p 😉
Shif.
[edit]There's probably errors in this LOL, but you get the idea![/edit]
Shifrin ·
Glaring mistake in what I wrote above, I neglected to leave 'p' and 'dp' as they are if neither p < 0.0 or p > pmax are true...
Will attempt to modify it 😉
Shif.
Shifrin ·
Updated, pUC = pUnChanged, the mask to use when neither of the conditions are true.
Shif.
spoonboiler ·
@shif:
thanx, i surely appreciate your assistance. I am still a rank beginner at this stuff, so it is alternatingly making sense, and making no sense at all 😆 i am completely at the mercy of my own curiousity with stuff like this. it drives me crazy, and yet i can't stop trying.
You have helped me. Thanx 🙂
-gabriel
rl ·
BTW: if you need to squeeze out the very last bit of performance, 0-p is faster than -1*p (subps vs. mulps)
Shifrin ·
rl wrote: BTW: if you need to squeeze out the very last bit of performance, 0-p is faster than -1*p (subps vs. mulps)
Nice spot 😉
Shif.
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