"half" the screen width with displaylib?

[Honitos]

First, I am a noob in chipset-related graphics programming!



I'd like to setup a display like 160x100 for a simple voxelspace engine demo (AGA).


Currently I use displaylib the standard way:



#display_width = 160
#display_height = 100
#display_depth = 8

InitCopList 0,44,#display_height,$10000 + #display_depth,8,256,0
CreateDisplay 0
DisplayPalette 0,0



With th8s code I get the bitmap drawn twice.
How do I get copper to get the bitmap fullscreen instead of the bitmap twice?

[Coagulus]

I'm not sure that can be done. Doubling pixels vertcally maybe but not horizontally.

Could one of the chunky libraries be of use instead?

[Nightshft]

I never used DisplayAdjust myself, but here Master484 explains how to reduce screen width.
Hope this helps

http://eab.abime.net/showpost.php?p=1390870&postcount=6

[Honitos]

That helps as he describes at least a bit how DisplayAdjust works, thanks.

[Nightshft]

I just tried it out.
- works fine
- having a bitmap with 320px width you dont need additional parameters to center it on the display
- usage is cumulative. Calling it a second time will narrow the display additionally by the amount specified.

Edit: and in WinUae 3.6.0 I had to set Filter from "automatic scaling" to "no scaling". Otherwise WinUae tried to compensate the change (at least partially).