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Oswald
Registered: Apr 2002
Posts: 5017 |
Sorting
are sorters really so slow in games? :) I have made my unrolled version for my theoretical game (;), and it takes 132 rlines to sort 32 numbers o_O worst case is ~200 lines. tho when its the case of 4 numbers have to be swapped only it does the job in ~10 lines. wastes a lot of memory but I like it :) |
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Oswald
Registered: Apr 2002
Posts: 5017 |
jack, well its just ammazing to me that how slow this operation really is. without tricks sorting alone can eat most of a frame. Taking into account how unoptimized games used to be its nice they can pull off their plexed sprites, and the rest in 50fps :)
edit: to gro, 132 rasterlines is the time it takes to sort 32 totally random numbers. |
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chatGPZ
Registered: Dec 2001
Posts: 11114 |
Quote:
groppie, I'm afraid you're comparing here 'progressive' performance with full rnd sorting. as said swapping around ~4 sprites takes less than 10 lines.
nope, my plexer doesnt take advantage of that, its full random sorting. the key is to use a reasonable amount of buckets, plus an unrolled bubblesort. (and if you can live with a little error you can leave out the bubblesort completely, which is what i did) |
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doynax
Account closed
Registered: Oct 2004
Posts: 212 |
Quote:
nope, my plexer doesnt take advantage of that, its full random sorting. the key is to use a reasonable amount of buckets, plus an unrolled bubblesort. (and if you can live with a little error you can leave out the bubblesort completely, which is what i did)
I actually do a progressive bucket sort which seems to help a bit. Bullets and enemy formations and such tends to move in step with each other after all. |
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Oswald
Registered: Apr 2002
Posts: 5017 |
doynax, whoaw, now thats a massive amount of sprites :) \o/ how do you make the d800 copy, and where ? :) btw what bugs me about bucket sort is how to deal with the random order in the multiplexer, also rejecting 9th sprites seems to be messy :P |
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chatGPZ
Registered: Dec 2001
Posts: 11114 |
Quote:
also rejecting 9th sprites seems to be messy
why reject? just make it so it's ignored :) (ie bucket can take more than 8 sprites, but plexer will only use first 8)
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doynax
Account closed
Registered: Oct 2004
Posts: 212 |
Quote: doynax, whoaw, now thats a massive amount of sprites :) \o/ how do you make the d800 copy, and where ? :) btw what bugs me about bucket sort is how to deal with the random order in the multiplexer, also rejecting 9th sprites seems to be messy :P
The d800 copy is double buffered and evenly distributed across 16 frames, so it really doesn't take much raster time at all ;)
As for the bucket sort I don't quite see what you mean. The
output is still just an ordered list of sprites, just like for the insertion sort.
As for rejecting the 9th sprite I don't do any fancy multiplexer "overload" testing at all. The code just tries to optimistically display as many sprites as possible and if doesn't fit then it's just not displayed (at least that's what happens in the type of multiplexer I wrote). |
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chatGPZ
Registered: Dec 2001
Posts: 11114 |
Quote:
As for rejecting the 9th sprite I don't do any fancy multiplexer "overload" testing at all. The code just tries to optimistically display as many sprites as possible and if doesn't fit then it's just not displayed (at least that's what happens in the type of multiplexer I wrote).
thats probably how most game multiplexers work. (look at SEUCK...argl =D) |
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Oswald
Registered: Apr 2002
Posts: 5017 |
you cant doublebuffer d800 :) for the bucket sort, I have to think it through as I'm totally new to this idea .) ie a multiplexer relies on the sorted list, wont bugs happen when sprites regs are not written in the order they should be ? :) |
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doynax
Account closed
Registered: Oct 2004
Posts: 212 |
Quote: you cant doublebuffer d800 :) for the bucket sort, I have to think it through as I'm totally new to this idea .) ie a multiplexer relies on the sorted list, wont bugs happen when sprites regs are not written in the order they should be ? :)
Really? Feel free to disassemble the code :)
As for the sprites if they aren't perfectly in order then the worst that can happen is that they won't be as tightly packed as possible. If it's properly written anyway. |
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chatGPZ
Registered: Dec 2001
Posts: 11114 |
keep in mind that eg your first "logical" sprite doesnt always have to be the first hardware sprite, it could be any of the 8 hardware sprites in the first bucket. you only have to maintain that if priorities matter (which they often dont in games, since sprites dont overlap) |
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