sam fisher
Well-Known Member
I just realised my version is clocked at 240 
Need Titlescreen, Music And Sound Effects!
- Thread starter Nagelfar
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sam fisher
Well-Known Member
That it's clocked at 240 ?
sam fisher
Well-Known Member
I didnt get what you meant at first
Edit: I just tested, fullspeed at 200mhz I guess I don't have such a handicap after all
Edit: I just tested, fullspeed at 200mhz
I guess I don't have such a handicap after all 
rokdcasbah
got me a date with botticelli's niece
i wonder if there's a way around sdl's slowness when alpha-blending, say by doing a lookup table of sorts.
like if there's 10 different color circles, most of the time they'll be the right color, but when they overlap you could detect where the surfaces collide and change the color to what's in the lookup table. obviously there'd be a lot of things to lookup, but the fewer colors there were, the better, and you could ignore combinations of, say, 4 or more. also you'd have to use a solid color background (but maybe you could again do a lookup table or fixed point addition for that).
i have no idea if that would work or work fast enough but i'm just throwing it out there...maybe i'll code it up myself (in 70 years)
like if there's 10 different color circles, most of the time they'll be the right color, but when they overlap you could detect where the surfaces collide and change the color to what's in the lookup table. obviously there'd be a lot of things to lookup, but the fewer colors there were, the better, and you could ignore combinations of, say, 4 or more. also you'd have to use a solid color background (but maybe you could again do a lookup table or fixed point addition for that).
i have no idea if that would work or work fast enough but i'm just throwing it out there...maybe i'll code it up myself (in 70 years)
rokdcasbah
got me a date with botticelli's niece
oh, just wait 70 years like i said, then we'll see who's "sry", java-man.Nagelfar said:
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sam fisher
Well-Known Member
i use alook up table to cheat at anglesrokdcasbah said:
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rokdcasbah
got me a date with botticelli's niece
i think the connection is just that the values are precalculated to avoid complicated math...in the case of angles you're skipping trig functions and in the case of alpha blending it'd be division (depending on whether your alpha blending needed division, i'm sure there's better ways with multiplication and fixed point conversions)
i wouldn't call it cheating though sam, just using the best method to get the job done. trig lookup tables sacrifice very little and give a ton of performance in return.
here's a tip that i think someone on the board gave me last year: you don't need 360 degrees. you just need to evenly split the circle. so you can go with something computer friendly like 256, and store the table in a smaller amount of memory. and if you're doing fixed point conversions it might make the bit-shifting easier to figure out.
i wouldn't call it cheating though sam, just using the best method to get the job done. trig lookup tables sacrifice very little and give a ton of performance in return.
here's a tip that i think someone on the board gave me last year: you don't need 360 degrees. you just need to evenly split the circle. so you can go with something computer friendly like 256, and store the table in a smaller amount of memory. and if you're doing fixed point conversions it might make the bit-shifting easier to figure out.
