Reuse sprite, attached and unattached

phx · 29 July 2015, 18:13

Is it possible to create an unattached sprite with the copper at the beginning of a line, followed by the same sprite (and its companion sprite) at the end of a line, but this time attached?

Example (single line):
Sprite 6 (4col) at xpos=16.
Sprite 6 and 7 (16col) at xpos=248.

In my game the DMA for sprite 6 and 7 is not available anyway, so I always write their SPRxPOS and SPRxDAT with the copper. For the example line I hope to use the following sequence:

SPR6POS,SPR6DATA,SPR6DATB,WAIT(after Spr6 is displayed),SPR6CTL,SPR7CTL,SPR6POS,SPR6DATA,SPR6DATB,SPR7POS,SPR7DATA,SPR7DATB

Sprite 6 and 7 don't have an attached bit set before this line. Now I set it with SPR7CTL in the middle of the line. I know that an access to the control register disables the sprite. But writing to SPRxPOS and SPRxDAT arms it again, right?

Could that ever work?

pmc · 29 July 2015, 20:46

Don't know the answer off the top of my head - sorry - but... this would seem like a good candidate for just trying it and seeing what happens. Nothing worse than "nope, that didn't work" could possibly await

Lonewolf10 · 29 July 2015, 20:54

PMC, are you back or am I imagining this?

phx, I agree with PMC. I think it will probably work

Toni Wilen · 29 July 2015, 21:01

Not answering the question, not sure but it probably works but what about simply keeping attach bit always enabled and adjust palette to match changed "not actually attached" sprites' palette selection? (If possible, it reduces number of unique sprite colors)

TheDarkCoder · 29 July 2015, 23:14

I bet it works, but you have to try! ;-)

Quote:

Originally Posted by phx

Is it possible to create an unattached sprite with the copper at the beginning of a line, followed by the same sprite (and its companion sprite) at the end of a line, but this time attached?

Example (single line):
Sprite 6 (4col) at xpos=16.
Sprite 6 and 7 (16col) at xpos=248.

In my game the DMA for sprite 6 and 7 is not available anyway, so I always write their SPRxPOS and SPRxDAT with the copper. For the example line I hope to use the following sequence:

SPR6POS,SPR6DATA,SPR6DATB,WAIT(after Spr6 is displayed),SPR6CTL,SPR7CTL,SPR6POS,SPR6DATA,SPR6DATB,SPR7POS,SPR7DATA,SPR7DATB

Sprite 6 and 7 don't have an attached bit set before this line. Now I set it with SPR7CTL in the middle of the line. I know that an access to the control register disables the sprite. But writing to SPRxPOS and SPRxDAT arms it again, right?

Could that ever work?

phx · 30 July 2015, 11:57

Ok, so I have to try that. Just wanted to know about my chances before doing so, because it needs some work to prepare all the code and graphics.

Quote:

Originally Posted by Toni Wilen

what about simply keeping attach bit always enabled and adjust palette to match changed "not actually attached" sprites' palette selection?

I already had the same idea, but as far as I understand sprite 7 will no longer use the same colours as sprite 6 in such a case. And I need these two sprites in other locations on the screen with their common colours.

phx · 02 August 2015, 20:29

FYI, it works!

Lonewolf10 · 02 August 2015, 23:42

Yes!

TheDarkCoder · 03 August 2015, 12:58

very good!
I win my bet! :-)
Which is my reward? An A3000T ? :-)

29 July 2015, 18:13	#1
phx Natteravn Join Date: Nov 2009 Location: Herford / Germany Posts: 2,496	Reuse sprite, attached and unattached Is it possible to create an unattached sprite with the copper at the beginning of a line, followed by the same sprite (and its companion sprite) at the end of a line, but this time attached? Example (single line): Sprite 6 (4col) at xpos=16. Sprite 6 and 7 (16col) at xpos=248. In my game the DMA for sprite 6 and 7 is not available anyway, so I always write their SPRxPOS and SPRxDAT with the copper. For the example line I hope to use the following sequence: SPR6POS,SPR6DATA,SPR6DATB,WAIT(after Spr6 is displayed),SPR6CTL,SPR7CTL,SPR6POS,SPR6DATA,SPR6DATB,SPR7POS,SPR7DATA,SPR7DATB Sprite 6 and 7 don't have an attached bit set before this line. Now I set it with SPR7CTL in the middle of the line. I know that an access to the control register disables the sprite. But writing to SPRxPOS and SPRxDAT arms it again, right? Could that ever work?

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29 July 2015, 20:46	#2
pmc gone Join Date: Apr 2007 Location: completely gone Posts: 1,596	Don't know the answer off the top of my head - sorry - but... this would seem like a good candidate for just trying it and seeing what happens. Nothing worse than "nope, that didn't work" could possibly await

29 July 2015, 20:54	#3
Lonewolf10 AMOS Extensions Developer Join Date: Jun 2007 Location: near Cambridge, UK Age: 44 Posts: 1,924	PMC, are you back or am I imagining this? phx, I agree with PMC. I think it will probably work

29 July 2015, 21:01	#4
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	Not answering the question, not sure but it probably works but what about simply keeping attach bit always enabled and adjust palette to match changed "not actually attached" sprites' palette selection? (If possible, it reduces number of unique sprite colors)

02 August 2015, 20:29	#7
phx Natteravn Join Date: Nov 2009 Location: Herford / Germany Posts: 2,496	FYI, it works!

02 August 2015, 23:42	#8
Lonewolf10 AMOS Extensions Developer Join Date: Jun 2007 Location: near Cambridge, UK Age: 44 Posts: 1,924	Yes!

03 August 2015, 12:58	#9
TheDarkCoder Registered User Join Date: Dec 2007 Location: Dark Kingdom Posts: 213	very good! I win my bet! :-) Which is my reward? An A3000T ? :-)

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