ia0i+@andrew.cmu.edu (Indu Tara Agarwal) (02/27/91)
I'm not positive this is the right forum, but my question is a little advanced for ...sys.amiga.introduction: How does a SHAM image work (i.e. what are the differences from standard HAM image format?) A general explanation would suffice, but if you had any example code, it would help me a great deal. Am I correct in my assumption (from reading tidbits about it) that it somehow resets the 32 main color registers for each scan-line to help reduce the "fringies" for the "HAM color" pixels? Thank you.....
s37732v@puukko.hut.fi (Markus Aalto) (02/27/91)
How does a SHAM image work (i.e. what are the differences from standard HAM
image format?) A general explanation would suffice, but if you had
any example code, it would help me a great deal.
Am I correct in my assumption (from reading tidbits about it) that
it somehow resets the 32 main color registers for each scan-line to
help reduce the "fringies" for the "HAM color" pixels?
Almost right!
It switches all the **16** main color registers for each scan-line because
HAM can use only 16 base colors + HAM effects.
Copper is very efficient for this kinda work, but it can switch one
register for every 4 lores pixels (8 hires ones). This is because
680*0 is usually used for this job, and it takes lots of processing
time (atleast in 68000).
Thank you.....
You`re welcome!
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* Markus Aalto
* s37732v@puukko.hut.fi
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* Markus Aalto | Only Amiga makes it possible!!!! *
* s37732v@puukko.hut.fi | Yeah! It's a sure thing! *
* maalto4@otax.hut.fi | :^) *
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