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Author Topic: [Axe] Mode 7 test  (Read 20860 times)

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Offline DJ Omnimaga

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Re: [Axe] Mode 7 test
« Reply #15 on: December 27, 2012, 03:44:19 pm »
Wait it works now. I just used a pic0 with almost nothing displayed in the area where it rotated. And the framerate was a bit low. I got it to work now and here's a screenshot.
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Offline Matrefeytontias

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Re: [Axe] Mode 7 test
« Reply #16 on: December 27, 2012, 03:57:09 pm »
I'm trying another technique, I'll post a screenshot (maybe) and a source (surely) once done.
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Re: [Axe] Mode 7 test
« Reply #17 on: December 29, 2012, 01:01:13 am »
Cool to hear. I can't wait to see how it looks like :)
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Offline Matrefeytontias

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Re: [Axe] Mode 7 test
« Reply #18 on: December 29, 2012, 09:29:32 am »
I can't believe it myself ... perfect Mode 7 ! O.O

With this new (and in fact, simpler) method, you have the choice between super-beautiful and awfully slow mode 7 :



Or super-fast and awfully ugly mode 7 :P :



I switch between these speeds by modifying the resolution. (sources for these 2 programs attached)
« Last Edit: December 29, 2012, 09:33:10 am by Matrefeytontias »
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Offline Ranman

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Re: [Axe] Mode 7 test
« Reply #19 on: December 29, 2012, 09:47:31 am »
Very nice! Great job!

Are there any other potential optimizations remaining?
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Offline Nick

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Re: [Axe] Mode 7 test
« Reply #20 on: December 29, 2012, 10:35:00 am »
Very nice, but how come it is so incredibly slow in the 'beautiful' mode?
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Offline Sorunome

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Re: [Axe] Mode 7 test
« Reply #21 on: December 29, 2012, 12:12:21 pm »
Wow, this is pretty awesome, congrats! :D
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Offline Matrefeytontias

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Re: [Axe] Mode 7 test
« Reply #22 on: December 29, 2012, 03:21:42 pm »
Thanks everyone :)

Quote from: Nick on December 29, 2012, 10:35:00 am
Very nice, but how come it is so incredibly slow in the 'beautiful' mode?

It's because of the resolution : in the "beautiful" mode, I draw the scene pixel by pixel, which 96*32 calculations (see the source to have the real numbers), and in the fast mode, I draw the scene with 4*4 squares, so I do 16 times less calculations - but it's pretty ugly.
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Offline Ranman

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Re: [Axe] Mode 7 test
« Reply #23 on: December 29, 2012, 03:58:39 pm »
I'm impressed with how small your code is.

Have you toyed with the idea of a look-up table? I know it is a lot more "code", but usually they are much faster -- and you need brute force speed here.

For example... The top line looks as if only 50% of the pixels tested are actually being drawn. So why test all of them? The table could contain the pixel offsets you might test as well as hold some intermediate precalculated values.

Very impressed!
« Last Edit: December 29, 2012, 04:03:08 pm by Ranman »
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Offline Builderboy

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Re: [Axe] Mode 7 test
« Reply #24 on: December 29, 2012, 04:03:57 pm »
That doesn't look quite like correct perspective, how are you going about doing your mode 7?
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Offline Matrefeytontias

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Re: [Axe] Mode 7 test
« Reply #25 on: December 29, 2012, 04:11:02 pm »
@Ranman I said I do 96*32 calculations, not 96*64. I test (and draw) only the bottom half of the screen. And I coded this around 2 am, so I'll optimise it right now :P

@Builderboy if it's not perspective, I don't know what it is. All the engine works around these formulas :

screenX = X / Z
screenY = Y / Z

Add some scaling and offsets, and you got it.
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Offline Ranman

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Re: [Axe] Mode 7 test
« Reply #26 on: December 29, 2012, 04:25:45 pm »
Quote from: Matrefeytontias on December 29, 2012, 04:11:02 pm
@Ranman I said I do 96*32 calculations, not 96*64. I test (and draw) only the bottom half of the screen. And I coded this around 2 am, so I'll optimise it right now :P

I think you misunderstood me... The top line (@32) where you first start drawing looks to have half as many physical pixels drawn as the bottom line (@63). Or you could look at this way.... the bottom line may have half as many pixels tested as the top line (@32).

Optimizing can be a whole heckuva lot of fun! :)
« Last Edit: December 29, 2012, 04:32:23 pm by Ranman »
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Offline Matrefeytontias

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Re: [Axe] Mode 7 test
« Reply #27 on: December 29, 2012, 04:30:16 pm »
Oh I see :P

It's because of my image. Try my program with a Pic0 full of pixels (like a full ground or something), there are as many pixels on the line 32 than on the line 63, it's just that the pixels of the line 32 are "further" than the ones of the line 63.
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Offline Ranman

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Re: [Axe] Mode 7 test
« Reply #28 on: December 29, 2012, 04:35:19 pm »
Quote from: Matrefeytontias on December 29, 2012, 04:30:16 pm
It's because of my image. Try my program with a Pic0 full of pixels (like a full ground or something), there are as many pixels on the line 32 than on the line 63, it's just that the pixels of the line 32 are "further" than the ones of the line 63.

I got ya... If you put these "pics" in a 2D array (like a tile map) you'll be drawing all pixels. Maybe my idea wasn't so good after all. LOL
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Offline Matrefeytontias

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Re: [Axe] Mode 7 test
« Reply #29 on: December 29, 2012, 04:43:57 pm »
Well, I looked at the source again, I can't see anything optimisable ; I can't find anything that can be precalculated and put into a LUT ; and I can't think of a simpler method. Maybe Mode 7 is not for Axe :(
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