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Forums > C64 Coding > Sprite + Sprite + Background priority color switching trick.
2015-06-20 00:25
Six

Registered: Apr 2002
Posts: 322
Sprite + Sprite + Background priority color switching trick.

So, I'm not sure what this technique is called, and I'm sure it's been done to death. I'm hoping to determine if there's a more efficient way to do it.
(Everything is in hires, not multicolor mode)

I put character graphics on screen.
color ram is pink
sprite 0 color is white
sprite 1 color is red
I put sprite 1 with matching bitmap data in front of the character graphics.
I set sprite-background priority to 01
I move sprite 0 partially in front of sprite 1.
In the areas in which sprite 0 has pixels in front of sprite 1, the character graphics show through, giving the appearance that red mixes with white to make pink.

SO...
What is this technique called?
Is there a better way to achieve it so that I'm not limited to a narrow width of graphics on screen?
 
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2015-06-23 10:41
ChristopherJam

Registered: Aug 2004
Posts: 1424
I quite like cookiecutter, or priority inversion.

Possibly 'felting' (as you're pulling up colours from the foreground through the lower priority sprites, like the craft technique with layers of fabric), but that might be a little obtuse.
2015-06-24 23:56
Martin Piper

Registered: Nov 2007
Posts: 739
How well is this emulated compared to real hardware?
2015-06-25 00:44
chatGPZ

Registered: Dec 2001
Posts: 11523
its perfectly emulated (of course, its trivial). see the test program i linked above. if it would'nt, demos like "tsunami" would look completely broken all over the place :)
2015-06-25 11:41
Cruzer

Registered: Dec 2001
Posts: 1051
Priority paradox - will call it that from now on.
2015-06-25 13:35
Oswald

Registered: Apr 2002
Posts: 5127
say that after a couple of beers :)
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