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Old 16 December 2019, 14:56   #1
deimos
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Join Date: Jul 2018
Location: France
Posts: 551
Blitter fill, writing clearing instead of setting?

Is the blitter fill mode limited to setting bits only? I can't find, either by searching or experimentation any way to clear rather than setting, just indications that it's not possible.

I want to fill / clear this (simplified):
00100
00010
00001
00000
00000
to result in:
00111
00011
00001
00000
00000
I can add extra 1s to the source if I have to, but I can't change where the existing 1s are.

This is for clearing / filling the last bitplane in my flight sim thingy to make sure the ground is drawn before I draw things on top of it. I need it to be inclusively filled so it's consistent with how it's drawn in other situations and so it works when I draw the next layer on top by drawing on another bitplane.

Any ideas?

Last edited by deimos; 16 December 2019 at 15:06.
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