Setting up a copperlist

oRBIT · 08 April 2010, 13:29

It has been quite awhile ago since I coded anything gfxrelated on the Amiga so I don't remember as much as I'd like to.

I'm trying to display a 256x240x5 image and the image always ends up being half the vertical size it should be.
I really don't remember much of the copperlist stuff so I usually ends up with some "trial and error" (which all results in "error" currently

)
Are there any "super newbie beginners guide to the copper" available? Or perhaps any kind person can help me achieve to above with some hints on what to modify in my copperlist?
Thanks in advance

StingRay · 08 April 2010, 14:00

Quote:

Originally Posted by oRBIT

I'm trying to display a 256x240x5 image and the image always ends up being half the vertical size it should be.

Just some quick tips, check if you initialize the bitplane pointers correctly, check if your modulos ($dff108/$10a) are correct and that you didn't select a hires mode in Bplcon0 (Bit15=0) and that you don't have a copperwait somewhere that you don't need.

oRBIT · 08 April 2010, 14:10

I'm not sure what's right and what's not to be honest, my memory is that bad..

Leffmann · 08 April 2010, 14:16

At a guess you're probably remembering the use of the bitplane modulos wrong, and set them to the width of your bitplanes when they should be set to 0. These values get added to the bitplane pointers after they've read and advanced past one scanline in memory, so if there are 0 bytes between the end of one scanline and the beginning of the next, that's what you need to set the modulos to.

You can also just ditch the copper list entirely and set things up with the CPU until you've gotten it right.

StingRay · 08 April 2010, 14:16

Well, what does your copperlist look like at the moment?

For a picture like that bpl1/2mod should be set to 0 and BPLCON 0 should be set to $5200. Try that and see if it fixes your problem.

oRBIT · 08 April 2010, 14:18

I got it working. Trial and error finally resulted in success.

I tried reading some old copper-related documents but to be honest, they're not really written for mortals like myself.

Thanks anyway for your interest.

08 April 2010, 13:29	#1
oRBIT Zone Friend Join Date: Apr 2006 Location: Gothenburg/Sweden Age: 48 Posts: 344	Setting up a copperlist It has been quite awhile ago since I coded anything gfxrelated on the Amiga so I don't remember as much as I'd like to. I'm trying to display a 256x240x5 image and the image always ends up being half the vertical size it should be. I really don't remember much of the copperlist stuff so I usually ends up with some "trial and error" (which all results in "error" currently ) Are there any "super newbie beginners guide to the copper" available? Or perhaps any kind person can help me achieve to above with some hints on what to modify in my copperlist? Thanks in advance

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08 April 2010, 14:10	#3
oRBIT Zone Friend Join Date: Apr 2006 Location: Gothenburg/Sweden Age: 48 Posts: 344	I'm not sure what's right and what's not to be honest, my memory is that bad..

08 April 2010, 14:16	#4
Leffmann Join Date: Jul 2008 Location: Sweden Posts: 2,269	At a guess you're probably remembering the use of the bitplane modulos wrong, and set them to the width of your bitplanes when they should be set to 0. These values get added to the bitplane pointers after they've read and advanced past one scanline in memory, so if there are 0 bytes between the end of one scanline and the beginning of the next, that's what you need to set the modulos to. You can also just ditch the copper list entirely and set things up with the CPU until you've gotten it right.

08 April 2010, 14:16	#5
StingRay move.l #$c0ff33,throat Join Date: Dec 2005 Location: Berlin/Joymoney Posts: 6,863	Well, what does your copperlist look like at the moment? For a picture like that bpl1/2mod should be set to 0 and BPLCON 0 should be set to $5200. Try that and see if it fixes your problem.

08 April 2010, 14:18	#6
oRBIT Zone Friend Join Date: Apr 2006 Location: Gothenburg/Sweden Age: 48 Posts: 344	I got it working. Trial and error finally resulted in success. I tried reading some old copper-related documents but to be honest, they're not really written for mortals like myself. Thanks anyway for your interest.

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