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  z-sorting versus z-buffering  (Read 8561 times)
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Offline Riven
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« JGO Overlord »


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Hand over your head.


« Reply #30 - Posted 2012-01-27 20:44:35 »

I've got a bigger better faster multi-threaded merger now.

It does something like this:
  • It concurrently sorts 4 chunks of the input
  • It samples the chunks at a fixed interval, to see how it's best to split each chunk into 8 smaller parts
  • It takes the average of the previous step and actually splits each chunk into 8 parts
    • chunks[n].parts[0] holds all smallest values,
    • chunks[n].parts[7] holds all largest values
  • It concurrently merges the all chunks[n].parts[k] into temporary array temps[k]
    • temps[0] holds all (ordered) smallest values
    • temps[7] holds all (ordered) largest values
  • It concatenates temps[n] into input

Time: 11.4s Cranky


31.4s -> 11.4s = 2.75x

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Offline Riven
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« JGO Overlord »


Medals: 1220
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Exp: 16 years


Hand over your head.


« Reply #31 - Posted 2012-02-02 10:29:04 »

--err.

Going to post new results 'soon' !

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Offline xsvenson
« Reply #32 - Posted 2012-02-02 10:39:51 »

I bow before Thee, OH Great Sorting God !

*bows*

Very interesting thread, now I just have to do something that requires sorting :/

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Offline Roquen
« Reply #33 - Posted 2012-02-02 15:11:50 »

Signed shifting will give you -1 & 0, then the multiplies can be converted into ANDs.
Offline Riven
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« JGO Overlord »


Medals: 1220
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #34 - Posted 2012-02-02 15:15:10 »

Signed shifting will give you -1 & 0, then the multiplies can be converted into ANDs.
I already changed it to be like that, but there was a serious bug, so I removed the code temporarily.

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