Copper source wanted.

10 November 2004, 17:13

Does anyone know how to copy the currently active copper list and modify it?

I'm wanting to install a gradient on my background as a learning exercise, but I'm stumped.

Thanks

Six

redblade · 11 November 2004, 11:26

you mean like what those old dos commands 'colours' and 'stripes' do?

11 November 2004, 17:50

Yeah, kind of. Any insight?

redblade · 12 November 2004, 11:32

hmm if you read 'how to code' it has a copper example.

I don't know if it a), installs a new copper address and then copies the previous copper back at the end or

b) backs up the current copper list, and then you restore it at the end.

but man buggers if i know how you scroll down the copper list to change the gradient and shit.

Photon · 24 November 2004, 16:08

Why not disassemble 'stripes' and see how they do it? I doubt it would work on newer OS's than 2.0 though.

If we're talking standard Amigas (up to A4000) what you can do is open graphics.library, which returns a pointer to a structure. In this structure (get it from some include file) there is a copper pointer. If you know the structure of a copper ($01800fff.l, ... , $fffffffe.l) all you have to do is copy the longwords in that copper list to some allocated chip address, except the ending $fffffffe, and then append whatever copper commands you like, and end it with $fffffffe.

Then set YOUR copper, preferably using library functions, or the hard way, by moving the address into $dff080.

Hope that helps. I'm oldskool. You've been warned.

10 November 2004, 17:13	#1
Six Posts: n/a	Copper source wanted. Does anyone know how to copy the currently active copper list and modify it? I'm wanting to install a gradient on my background as a learning exercise, but I'm stumped. Thanks Six

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11 November 2004, 11:26	#2
redblade Zone Friend Join Date: Mar 2004 Location: Middle Earth Age: 40 Posts: 2,127	you mean like what those old dos commands 'colours' and 'stripes' do?

11 November 2004, 17:50	#3
Six Posts: n/a	Yeah, kind of. Any insight?

12 November 2004, 11:32	#4
redblade Zone Friend Join Date: Mar 2004 Location: Middle Earth Age: 40 Posts: 2,127	hmm if you read 'how to code' it has a copper example. I don't know if it a), installs a new copper address and then copies the previous copper back at the end or b) backs up the current copper list, and then you restore it at the end. but man buggers if i know how you scroll down the copper list to change the gradient and shit.

24 November 2004, 16:08	#5
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,633	Why not disassemble 'stripes' and see how they do it? I doubt it would work on newer OS's than 2.0 though. If we're talking standard Amigas (up to A4000) what you can do is open graphics.library, which returns a pointer to a structure. In this structure (get it from some include file) there is a copper pointer. If you know the structure of a copper ($01800fff.l, ... , $fffffffe.l) all you have to do is copy the longwords in that copper list to some allocated chip address, except the ending $fffffffe, and then append whatever copper commands you like, and end it with $fffffffe. Then set YOUR copper, preferably using library functions, or the hard way, by moving the address into $dff080. Hope that helps. I'm oldskool. You've been warned.

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