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Author Topic: Optimize me plz.  (Read 3884 times)

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Offline Happybobjr

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Optimize me plz.
« on: October 09, 2011, 04:55:47 pm »
Ok, so i have a rotation routine.

Code: [Select]
:For(X,0,95)
:For(Y,0,63)
:cos(A)->D
:sin(A)->E
:If pxl-Test(X,Y)^r
:Pxl-on((X*D-(Y*E)//128,Y8D+(X-16*E)//128)
:END:END:END
And i do that for every pixel on screen.
Anyone know of a fast way to do this?
« Last Edit: October 09, 2011, 05:09:59 pm by Qwerty.55 »
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Offline AngelFish

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Re: Optimize me plz.
« Reply #1 on: October 09, 2011, 05:14:30 pm »
Code: [Select]
:cos(A)->D
:sin(A)->E
:For(X,0,95)
:For(Y,0,63)
:If pxl-Test(X,Y)^r
:Pxl-on(X-Y*E//128,Y8D+(X-16*E)//128)
:END:END:END
That's a bit more optimized, although I'm sure Runer could improve upon it.
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Offline Happybobjr

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Re: Optimize me plz.
« Reply #2 on: October 09, 2011, 05:20:47 pm »
lol.  I was looking more for an optimization in concept.

Like it would be better to only test pixels above (lesser y value) than vertical shift.
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Offline AngelFish

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Re: Optimize me plz.
« Reply #3 on: October 09, 2011, 05:32:39 pm »
If you didn't mind a 90 degree rotation, then this might be more optimized:

Code: [Select]
:For(A,0,95
:A^12->X
:A/8->Y
:Pt-On(X,Y,RotC(Pt-get(X,Y)))
:END
« Last Edit: October 09, 2011, 05:33:03 pm by Qwerty.55 »
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∂²Ψ    -(2m(V(x)-E)Ψ
---  = -------------
∂x²        ℏ²Ψ

Offline Happybobjr

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Re: Optimize me plz.
« Reply #4 on: October 09, 2011, 05:42:09 pm »
that will only turn 90 degrees though, correct :(
« Last Edit: October 09, 2011, 05:45:08 pm by Happybobjr »
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Offline AngelFish

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Re: Optimize me plz.
« Reply #5 on: October 09, 2011, 05:49:33 pm »
Yes.
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∂²Ψ    -(2m(V(x)-E)Ψ
---  = -------------
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Offline Happybobjr

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Re: Optimize me plz.
« Reply #6 on: October 09, 2011, 07:48:52 pm »
I am good now, thanks for trying to help.
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Offline Quigibo

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Re: Optimize me plz.
« Reply #7 on: October 09, 2011, 08:45:52 pm »
Instead of scanning the pixels in the back buffer and projecting them to the front buffer, you will get better results if you scan the front buffer and inverse-project from the back buffer.  This assures that every pixel is accounted for which won't happen if you do it the other way.

But as far as speed I don't think you can optimize more than that.  As Qwerty said, definitely pre-compute the sine and cosine before your for loops.
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Offline Happybobjr

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Re: Optimize me plz.
« Reply #8 on: October 09, 2011, 08:48:51 pm »
Ok thanks, but i don't exactly get what inverse-project means.

Didn't realize i put them inside the loop :/.  Thank you very much for that.  Guess i need sleep.
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Offline calc84maniac

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Re: Optimize me plz.
« Reply #9 on: October 09, 2011, 08:55:53 pm »
Actually, it's better if you get rid of all the multiplication :P

Something like this (untested):
Code: [Select]
cos(A)*2→D
sin(A)*2→E
.Upper left corner (scaled by 256) in B,C
0→B
0→C
For(Y,0,63)
B-E→B→I
C+D→C→J
For(X,0,95)
If pxl-Test(I+D→I/256,J+E→J/256)r
pxl-On(X,Y)
End
End
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