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29 January 2020, 21:10
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#1 |
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OctaMED Music Composer
Join Date: Jan 2009
Location: Venice - Italy
Age: 49
Posts: 666
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Blitter shift BACKWARDS
Here I am again with another n00by question:
I'm using the blitter to shift some stuff, like this: Code:
MOVE.W #%0001100111110000,BLTCON0 ; BLTCON0 But how to scroll in the opposite direction?  Please be nice to me, I'm doing my best but the BLITTER is a son of a... 
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29 January 2020, 21:13
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#2 |
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Registered User
Join Date: Jul 2017
Location: San Jose
Posts: 651
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You start one word left of your data and shift right by 16-leftshift.
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29 January 2020, 21:37
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#3 |
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Defendit numerus
Join Date: Mar 2017
Location: Crossing the Rubicon
Age: 53
Posts: 4,468
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You have to use descending mode.
All blitter operations are reversed so you must start from the last source word (modulo will be subtracted rather than added and shifts will go to the left). DESC = Bit 1 of BLTCON1 |
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29 January 2020, 21:50
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#4 |
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OctaMED Music Composer
Join Date: Jan 2009
Location: Venice - Italy
Age: 49
Posts: 666
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stupid me, I was focusing only on BLTCON0! Thanks!!!
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