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Offline ZippyDee

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Efficient 12x12 sprite routines
« on: March 26, 2011, 04:58:58 am »
I'm working on a game in which I want to use 12x12 sprites, and I would REEEEEEEEEEALLY rather not have 48 wasted bits for every sprite, so I'm looking for an efficient method of displaying 12x12 sprites. If I knew how to access data from an Axe program, I'd just figure out a 12x12 routine using my small knowledge of ASM. Sadly, I don't know how to do that, so I can't. :P

Any suggestions?

Thanks!
-Zippy Dee

Edit: I know how I'd write one in Axe, I just don't know if it would be very optimal, so I guess that's really what I'm looking for: either an assembly routine or an optimized axe routine.
« Last Edit: March 26, 2011, 05:17:05 am by ZippyDee »
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Offline Munchor

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Re: Efficient 12x12 sprite routines
« Reply #1 on: March 26, 2011, 07:13:54 am »
Quote from: ZippyDee on March 26, 2011, 04:58:58 am
I'm working on a game in which I want to use 12x12 sprites, and I would REEEEEEEEEEALLY rather not have 48 wasted bits for every sprite, so I'm looking for an efficient method of displaying 12x12 sprites. If I knew how to access data from an Axe program, I'd just figure out a 12x12 routine using my small knowledge of ASM. Sadly, I don't know how to do that, so I can't. :P

Any suggestions?

Thanks!
-Zippy Dee

Edit: I know how I'd write one in Axe, I just don't know if it would be very optimal, so I guess that's really what I'm looking for: either an assembly routine or an optimized axe routine.

If you know how to make it using Assembly, I suggest Axioms, in case you don't know what they are, they are subroutines coded in pure Assembly but that can be used in Axe.
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Offline ZippyDee

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Re: Efficient 12x12 sprite routines
« Reply #2 on: March 26, 2011, 07:19:24 am »
I could probably write a crude routine in assembly, but as I said I don't know how to access data defined within the Axe program.
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Offline Munchor

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Re: Efficient 12x12 sprite routines
« Reply #3 on: March 26, 2011, 07:23:25 am »
Quote from: ZippyDee on March 26, 2011, 07:19:24 am
I could probably write a crude routine in assembly, but as I said I don't know how to access data defined within the Axe program.

There's an example on how to use Axioms in Axe 0.5.0's download and I guess you can find some explanations there...
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Offline ZippyDee

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Re: Efficient 12x12 sprite routines
« Reply #4 on: March 28, 2011, 12:31:48 am »
Great, thanks! Runner12 suggested that I could just save 12x16 sprites and display them as 16x16 and therefore only end up with 6 bytes wasted. I think I'll live with that for now. But this Axiom system is really well defined! I'll certainly be using them for other things at some point.
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Offline FloppusMaximus

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Re: Efficient 12x12 sprite routines
« Reply #5 on: March 28, 2011, 11:02:14 pm »
You might consider storing them in a packed form and only uncompressing them when your program starts up.

Or I could write a routine for you.  What type of sprites are we talking about (OR, XOR, masked, grayscale, clipped, ...?)
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Offline ZippyDee

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Re: Efficient 12x12 sprite routines
« Reply #6 on: March 29, 2011, 02:56:03 am »
Yeah, I did think about decompressing on runtime, and that could work...The sprites I'm thinking of using would be masked 4-level grayscale, because I'm too ambitious for my own good. :P
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Offline FloppusMaximus

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Re: Efficient 12x12 sprite routines
« Reply #7 on: March 29, 2011, 10:23:26 pm »
Oh, OK.  So you'd be looking at 18 bytes of wasted space per sprite, not 6.  Would you give every sprite its own mask, or share a mask between multiple sprites?

Also, I don't really know how grayscale works in Axe.  Which buffers do you use?
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Offline ztrumpet

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Re: Efficient 12x12 sprite routines
« Reply #8 on: March 29, 2011, 10:37:58 pm »
Quote from: FloppusMaximus on March 29, 2011, 10:23:26 pm
Also, I don't really know how grayscale works in Axe.  Which buffers do you use?
appBackUpScreen (L3 to Axe users) is the back buffer.
plotSScreen(L6 to Axe users) is the front buffer.
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Offline FloppusMaximus

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Re: Efficient 12x12 sprite routines
« Reply #9 on: March 29, 2011, 11:04:22 pm »
Oh, this is confusing, but I think I understand now.  That's not what "back" and "front" mean in normal usage.  So is appBackUpScreen "light" and plotSScreen "dark", or vice versa?
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Offline leafy

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Re: Efficient 12x12 sprite routines
« Reply #10 on: March 29, 2011, 11:05:02 pm »
plotSScreen "black and white"
appBackUpScreen "light/dark grey"

EDIT: Actually that's not strictly true. plotSScreen and appBackUpScreen combine to make dark grey and black.

plotSScreen + appBackUpScreen = Black
plotSScreen = Dark Grey
appBackUpScreen = Light Grey
0 = White
« Last Edit: March 29, 2011, 11:08:10 pm by leafiness0 »
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Offline ZippyDee

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Re: Efficient 12x12 sprite routines
« Reply #11 on: March 30, 2011, 02:20:21 am »
But what I'd be using is 3 12x12 sprites. The first two sprites would each be drawn to their corresponding buffer (plotSScreen/appBackUpScreen), but they'd first be masked using the third sprite. That allows me to use 4 levels of grayscale and still preserve the background (which I'd keep in another place, probably an appvar or something then delete at the end).
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Offline FloppusMaximus

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Re: Efficient 12x12 sprite routines
« Reply #12 on: March 30, 2011, 10:26:35 pm »
That's sort of what I was asking before, about whether you'd want to have the mask as part of the sprite or as something separate.

I was assuming you'd want to draw everything (mask and both image planes) in one pass, but using multiple passes is also an interesting idea; it would make the code much simpler (hence smaller), as well as more flexible, but also somewhat slower.
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