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Atari demoscene BBS
| Re: How do you zoom on Atari? |
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Posted by: Paranoid / pdx
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Jan,29.2013-22:39
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Well, i'm not good at disassembling other people's code, but when looking
at the video frame by frame, it looks like a set of wisely calculated tables
for the zoom-scroller.
It zooms fairly quickly - in other words in large steps, also, most of the
zoomed pixels seem to be of identical size mostly. If they could do it in
realtime, they would have slowed it down significantly to show off.
I rather assume they have a minimum zoom increment of 1/8, so that
reading a byte will result in 9 bits, 10 bits and so on up to 16 bits =
8 tables.
To cover a full line this way, 8 tables x 256 possible combinations x
40 byte positions = 80KB - To zoom beyond a factor of 2 they would
either need to run over the data multiple times or simple generate
additional tables (160/240/320KB) - I assume a mixture of both.
Just my two pence.
The Paranoid / Paradox
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Topic
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Posted by
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Date
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How do you zoom on Atari?
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Zamuel_a
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Jan,28.2013-23:30
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Re: How do you zoom on Atari?
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evil
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Jan,29.2013-16:44
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Re: How do you zoom on Atari?
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Zamuel_a
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Jan,29.2013-17:16
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Re: How do you zoom on Atari?
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evil
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Jan,29.2013-17:34
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Re: How do you zoom on Atari?
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Paranoid / pdx
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Jan,29.2013-22:39
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Re: How do you zoom on Atari?
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Bod/STAX
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Jan,29.2013-17:21
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Re: How do you zoom on Atari?
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Zamuel_a
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Jan,29.2013-19:36
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Re: How do you zoom on Atari?
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ggn
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Jan,30.2013-09:47
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Re: How do you zoom on Atari?
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Zamuel_a
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Jan,30.2013-12:30
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Re: How do you zoom on Atari?
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nativ
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Jan,31.2013-16:21
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Re: How do you zoom on Atari?
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Dma-Sc
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Feb,01.2013-12:39
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What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
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