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Atari coding BBS
| Re: p2c routine? |
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Posted by: earx
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Mar,22.2005-19:48
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for 060 you can do it much like the usual amiga c2p: shifts with orring.
for older processors you can use look-up tables: check out your planar bits:
aa......bb.....cc......dd.....
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now the first 4 planar pixels are shifted + orred into a 16 bit word:
aaaabbbbccccdddd
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and this we run through the look-up table to get the first four chunky pixels (4 bit)
abcdabcdabcdabcd.. repeat this shifted to get the full 16 pixels..
i think paranoid also did a p2c. you might be able to get some info from him too.
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