Re: A92: The problem with variable-line sprites
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Re: A92: The problem with variable-line sprites
To use variable line sprites:
assuming your sprite is layed out like this:
dc.w number of lines
dc.w line1
dc.w line2
dc.w ...
dc.w maskline1
dc.w maskline2
dc.w maskline3
dc.w ...
then, ...
move spritename.w to d0
lea spritename+2 to a0
lea spritename+2+(2*lines) to a1
lea starting address to a2
or (a1).w to (a2)
xor (a1)+.w to (a2)
or (a0)+.w to (a2)+
subtract 1 to d0
loop above 4 lines until d0=4
rts
note: use 4*lines and .l for lword width ; 1*lines and .b for byte width
you'll have do modify it for grayscale.
hope this helps
Noah Medling
http://xp.calc.org/
---- "Cliff L. Biffle" <cbiffle@safety.net> wrote:
>
>
> >how can l take what l have there and make it so that it will
> >display the lines of sprite and the lines of mask that l intended, instead of
> >using the lines of sprite as a mask when changing the number of lines that
> >the sprite is to be displayed?
>
> Um...do you have any code to go along with that?
> --Cliff Biffle
>
> Optimist: This glass is half full.
> Pessimist: This glass is half empty.
> Cynic: They drank my water. Figures.
> Engineer: The glass should be -half- this size!
>
>
>
>
>
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