Subject: Re: [stella] Hello, and.. my game From: "Fabrizio Zavagli" <rasty@xxxxxxxxx> Date: Sun, 9 Jun 2002 13:10:51 +0200 |
> I tried on pcaewin didn't work,I didn't know how to use cyberstella, so I > passed on that It worked on z26 and rasty, for your first try it looks great > for a game, I wish my demo I'm doing looked that great (asymetcial playfield is > hard to do, I could do it ok I just get garbage on one side over my orginal > playfield) Thanks Dan! I still have to look into emulator compatibility issues.. I just included a title screen with asymmetrical playfield.. I've used the asymmetrical reflect demo by Roger Williams and Glenn Saunders as a basis, so I know what you mean :) About the asymmetrical playfields, there's something I don't really understand about it. I was modifying the above-mentioned sample to squeeze and slightly optimize it and decided to use the Y register instead of memory. When I've implemented Y, I started having some garbage (black vertical lines) on the screen when re-writing to PF0... Basically, I've changed some code from this: ----------------------------------- ScanLoop DEC ScanPix ;next screen pixel line BNE ScanGo LDA #5 STA ScanPix DEX ;next big pixel line BNE ScanGo LDX #6 ScanGo STA WSYNC ; ; Time to begin cycle counting ; LDA PFData0,X ;[0]+4 STA PF0 ;[4]+3 = *7* < 23 (continues with PF writes)... ----------------------------------- to this: ----------------------------------- ScanLoop DEY ;next screen pixel line BNE ScanGo LDY DEX ;next big pixel line BNE ScanGo LDX #6 ScanGo STA WSYNC ; ; Time to begin cycle counting ; LDA PFData0,X ;[0]+4 STA PF0 ;[4]+3 = *7* < 23 (continues with PF writes)... ----------------------------------- As you see, I've just replaced ScanPix with the unused Y register... that should take less cycles and memory.. but I get that weird artifact! Actually I get the artifact whenever I write to the Y register.. Well, it's not vital, but it's something I can't really figure out myself! I'd love some help with it, to have some better sleep :) eheh Thanks! Rasty.- ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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