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sprite masking


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Hey, does anyone have any suggestions on how best to mask parts of a sprite, to change a certain number of lines—instead of having a separate full sprite ?


*ideally without doing this during the kernel


	lda (objectptr),y
	cpx #5
	bcc .nomask
	and #%11110000
	sta GRP1

I am doing this in the kernel though, and seems to work as intended, but wondering if there is another way.

Edited by pvmpkin
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brilliant, thank you.


I've noticed this a few times:

.byte $2c

You indicate that it skips the next LDA instruction but I don't understand why that is used, the context of it.


OH, I think I see it. It's a way of reusing the store instruction without changing the value right ?

Edited by pvmpkin
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