Author Topic: How does 4-level greyscale work in Axe? (Read 26033 times)

Deep Toaster · « **Reply #30 on:** June 06, 2010, 10:16:10 pm »

Quote from: Quigibo on June 06, 2010, 10:05:17 pm

Drawing Sprite A...
Over White Over Black Over Sprite B
Pt-On A Black A OR B
Pt-Change A A Invert A XOR B
Pt-Off A A A

Also, xoring twice is the same as removing since (A xor B) xor B = A

So Pt-Off is the same as clearing an 8x8 square first, then drawing the sprite?

calcdude84se · « **Reply #31 on:** June 06, 2010, 10:47:27 pm »

yes, that is right exactly. If you want more control over what is cleared, use masking.

DJ Omnimaga · « **Reply #32 on:** June 06, 2010, 10:47:39 pm »

yep, it erases a 8x8 square then draws a sprite.

I wonder if it's slower than Pt-On? I mean, for example, would ClrDraw then Pt-On('ing 96 sprites be faster than Pt-Off('ing 96 sprites? (assuming they need to be displayed every frame)

calc84maniac · « **Reply #33 on:** June 06, 2010, 10:53:51 pm »

Quote from: DJ Omnimaga on June 06, 2010, 10:47:39 pm

yep, it erases a 8x8 square then draws a sprite.

I wonder if it's slower than Pt-On? I mean, for example, would ClrDraw then Pt-On('ing 96 sprites be faster than Pt-Off('ing 96 sprites? (assuming they need to be displayed every frame)

I think if the sprite is aligned, Pt-Off would be faster. If unaligned, Pt-On would be faster.

calcdude84se · « **Reply #34 on:** June 06, 2010, 10:55:01 pm »

I would think it would be slower, for while ClrDraw is just a single event, it happens for each Pt-Off, with the added fun of sprite drawing. I'd test it to make sure though. (Use an 84+(SE) and a BASIC program enveloping it)

Author Topic: How does 4-level greyscale work in Axe? (Read 26033 times)

Deep Toaster

Re: How does 4-level greyscale work in Axe?

calcdude84se

Re: How does 4-level greyscale work in Axe?

DJ Omnimaga

Re: How does 4-level greyscale work in Axe?

calc84maniac

Re: How does 4-level greyscale work in Axe?

calcdude84se

Re: How does 4-level greyscale work in Axe?