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  Mode 7?  (Read 1187 times)
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Offline Eliwood

Junior Devvie




Stencyl


« Posted 2006-11-17 17:48:33 »

How would I go about implementing/emulating the SNES' Mode 7 in Java?

Offline oNyx

JGO Coder


Medals: 2


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« Reply #1 - Posted 2006-11-17 18:37:03 »

Mode7 covers several different effects. So which one are you after? Rotating some ground plane as in mario kart or f-zero?

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Offline Eliwood

Junior Devvie




Stencyl


« Reply #2 - Posted 2006-11-17 19:20:02 »

Right now, I'm just after emulating the effect used in world maps for RPG's (like Secret of Mana), so that would probably fall under the rotation part of it. An explanation of the other effects wouldn't hurt though. Wink

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Offline fletchergames

Senior Devvie





« Reply #3 - Posted 2006-11-17 19:31:37 »

Maybe you could just draw the screen to a BufferedImage prior to drawing it to the actual screen.  Then you could enlarge whatever part of the BufferedImage you need and rotate it as necessary.

If I'm thinking of the right effect from Secret of Mana, it kind of looks like the screen just keeps zooming in and rotating faster and faster.
Offline woogley
« Reply #4 - Posted 2006-11-17 19:34:36 »

i started out doing something similiar a while back to get some basic texture mapping in some java2d apps. this tutorial is pretty good, though it involves pixel-by-pixel operations, so you might find it best to use MemoryImageSource or something Wink

it seems geared towards ROM developers, but it explains some of the math that might help you

http://user.chem.tue.nl/jakvijn/tonc/mode7.htm

also note that he wrote a second page after that (which isnt immediately obvious), so don't forget to check that also: http://user.chem.tue.nl/jakvijn/tonc/mode7ex.htm
Offline oNyx

JGO Coder


Medals: 2


pixels! :x


« Reply #5 - Posted 2006-11-17 20:21:04 »

http://en.wikipedia.org/wiki/Mode_7

"The Super NES console has eight modes, numbered from 0 to 7, for displaying background layers, the last one having a single background layer that can be scaled and rotated."

It was also used for effects which looked like there is something rotating infront of some background. The background, however, was actually build out of sprites. (An example would be one of the Contra/Probotector boss fights.)

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