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Forums > C64 Coding > Updating sprite X msb
2016-03-26 15:50
ChristopherJam

Registered: Aug 2004
Posts: 1409
Updating sprite X msb

Slack bastard time. Recs for updating $d010 if I've got an eight bit x-position in my object table, but all my sprites are offset a constant number of pixels to the right? Current draft is this:
	clc
	lda mobX,x
	adc xoffset
	sta $d000,y
	lda #0
	adc #255
	eor #255
	eor $d010
	and hibit,x
	eor $d010
	sta $d010

(x is both object ID and sprite number (I'll change how I index mobX later), y is double the sprite number. hibit contains 2**i)
 
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2016-03-27 08:39
Rastah Bar
Account closed

Registered: Oct 2012
Posts: 336
2016-03-27 09:59
Rastah Bar
Account closed

Registered: Oct 2012
Posts: 336
Quoting Hoogo
I wonder if that multiplexer reuses the sprites in order, so that for every call y will increased by 2 and start with 0 again? Not sure if that can make a difference, just thinking...



If you can use a separate piece of code for each sprite, maybe you could do (for example for sprite 3)?
clc
lda mobX+3
adc xoffset
sta $d006
lda $d010
and #f7 ; clear first
bcc store
ora #$08
store
sta $d010
2016-03-27 12:23
Skate

Registered: Jul 2003
Posts: 494
Quote: Quoting Hoogo
I wonder if that multiplexer reuses the sprites in order, so that for every call y will increased by 2 and start with 0 again? Not sure if that can make a difference, just thinking...



If you can use a separate piece of code for each sprite, maybe you could do (for example for sprite 3)?
clc
lda mobX+3
adc xoffset
sta $d006
lda $d010
and #f7 ; clear first
bcc store
ora #$08
store
sta $d010


I remember writing a macro like this one, using sprite number as a parameter and generating these and/or values according to the number. this way code looks fine, things speed up, memory usage sucx, speed rocx. :)
2016-03-27 17:50
Rastah Bar
Account closed

Registered: Oct 2012
Posts: 336
Quoting Color Bar

If you can use a separate piece of code for each sprite, maybe you could do (for example for sprite 3)?

Now I look more carefully I see that this is what Hein is doing ...
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