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22 November 2011, 18:48
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#1 |
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Zone Friend
Join Date: May 2006
Location: France
Posts: 1,801
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Copperlist to fit Atari ST screen possible?
Hi,
Is it possible to build a Copperlist to fit Atari ST screen configuration ? See http://www.atari-forum.com/wiki/inde..._Specification Thanks Kamel |
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22 November 2011, 19:19
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#2 |
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move.l #$c0ff33,throat
Join Date: Dec 2005
Location: Berlin/Joymoney
Posts: 6,863
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You mean "emulating" the interleaved bitplanes of the ST? If so, yes, that's perfectly possible.
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22 November 2011, 21:01
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#3 |
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Zone Friend
Join Date: May 2006
Location: France
Posts: 1,801
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Yeah that what I meant, good to know for porting ST games.
Thanks Kamel |
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22 November 2011, 21:08
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#4 |
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2 contact me: email only!
Join Date: May 2001
Location: Auckland / New Zealand
Posts: 3,182
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StingRay: How exactly can you get the Amiga to effectively display a word from the 1st plane then skip 3 words for the next 3 planes, repeated all across the scanline?
(Emulating a 320x200 16 colour screen obviously). If the screen width was 2 words, easy. But 20 words? I can't see how it would work. If it could work, wouldn't it be rather trivial to convert almost any ST game to the Amiga just by changing the sound? Last edited by Codetapper; 23 November 2011 at 19:20. Reason: Correction: Need to skip 3 words not 6! |
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22 November 2011, 21:50
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#5 |
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gone
Join Date: Apr 2007
Location: completely gone
Posts: 1,596
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Can't what you're describing just be done with bitplane modulos or is that too obvious?
EDIT: went and actually bothered to look at the description in the link kamelito posted... I see what you're getting at Codetapper that modulos alone won't cut it. Last edited by pmc; 22 November 2011 at 22:50. Reason: It was too obvious :D |
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22 November 2011, 23:07
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#6 |
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Registered User
Join Date: May 2004
Location: Somewhere secret
Age: 50
Posts: 365
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Yup I don't think this can be done - I think Stingray underestimated how truly horrible the ST's screen format was
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24 November 2011, 10:51
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#7 |
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son of 68k
Join Date: Nov 2007
Location: Lyon / France
Age: 51
Posts: 5,323
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The best way I've found to do ST screen conversion is converting it with CPU. My code uses ~35% cpu on 50 Mhz 030 to perform 320x200 screen (16 colors) conversion at 50 fps (provided source screen is in fastmem).
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