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Author Topic: [Lua] CHIP-8 emulator  (Read 10024 times)

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Offline Jim Bauwens

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[Lua] CHIP-8 emulator
« on: December 08, 2012, 02:54:57 pm »
A couple of days ago I started to port a Lua based CHIP-8 emulator I found online to the TI-Nspire.
Yesterday I got it working, and after fixing some emulator bugs and improving/optimizing the overall code I can say that it's already quite decent.





As you can see in the video, there are still some issues with screen flickering (well, actually invaders is the only game that really has a problem with that).
Space Invaders runs a little slow, but it's one of the more complex CHIP-8 games.
Blitz, Tetris, Brix, Vbrix and some other games I tested run basically at full speed.

I'm still going to try to optimize the screen drawing part, but I'm already very happy with the result :)
« Last Edit: December 08, 2012, 07:24:32 pm by Jim Bauwens »
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Offline ElementCoder

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Re: [Lua] CHIP-8 emulator
« Reply #1 on: December 08, 2012, 02:57:26 pm »
This looks awesome, though I have no idea what CHIP-8 is :P some sort of old computer system?
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Offline Jim Bauwens

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Re: [Lua] CHIP-8 emulator
« Reply #2 on: December 08, 2012, 03:01:20 pm »
CHIP-8 is a kind of virtual machine, with it's own instruction set and hardware. It was created in the 80's for some consoles in that time, allowing games to run on multiple different architectures.
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Offline TIfanx1999

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Re: [Lua] CHIP-8 emulator
« Reply #3 on: December 08, 2012, 03:09:03 pm »
Wow, great work Jim! There is also a Z80 asm implementation of this floating around on Ticalc somewhere.
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Offline annoyingcalc

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Re: [Lua] CHIP-8 emulator
« Reply #4 on: December 08, 2012, 03:22:15 pm »
How is this possible? I thought lua couldnt open files?
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Offline Adriweb

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Re: [Lua] CHIP-8 emulator
« Reply #5 on: December 08, 2012, 03:26:14 pm »
Nspire-Lua can't, indeed, with io.* things as in normal lua, but here, the game is put as a one-big-line-array thing embedded directly in the script :)
The emulator itself not being huge at all, each .tns contains the game and the emulator ^^

Edit : as Jim said in the next post, you can actually "import" stuff from outside : math/basic variables from documents located in MyLib folder, in fact :)
« Last Edit: December 08, 2012, 03:29:34 pm by adriweb »
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Offline Jim Bauwens

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Re: [Lua] CHIP-8 emulator
« Reply #6 on: December 08, 2012, 03:27:17 pm »
I plan to add support for opening external ROM files ;)
That is most certainly possible.
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Offline annoyingcalc

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Re: [Lua] CHIP-8 emulator
« Reply #7 on: December 08, 2012, 03:30:13 pm »
Quote from: adriweb on December 08, 2012, 03:26:14 pm
Nspire-Lua can't, indeed, with io.* things as in normal lua, but here, the game is put as a one-big-line-array thing embedded directly in the script :)
The emulator itself not being huge at all, each .tns contains the game and the emulator ^^

Edit : as Jim said in the next post, you can actually "import" stuff from outside : math/basic variables from documents located in MyLib folder, in fact :)
Oh, ok thanks for clarifying
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Offline excale

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Re: [Lua] CHIP-8 emulator
« Reply #8 on: December 08, 2012, 04:01:16 pm »
Quote from: Jim Bauwens on December 08, 2012, 03:27:17 pm
I plan to add support for opening external ROM files ;)
That is most certainly possible.

Well, luaext could be used for this purpose. :)
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Offline Lionel Debroux

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Re: [Lua] CHIP-8 emulator
« Reply #9 on: December 08, 2012, 04:05:27 pm »
For this purpose and so many others, yeah. It's a perfect example of the power of native code and its complementarity with TI's narrow-minded views. TI is silly to try and prevent the inevitable access to native code.
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Offline annoyingcalc

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Re: [Lua] CHIP-8 emulator
« Reply #10 on: December 08, 2012, 11:16:24 pm »
Can you post an aplha soon, Id like to look into the source (to see how an emulator works) and I think lua would be a good place for me to start since I know lua
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Offline DJ Omnimaga

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Re: [Lua] CHIP-8 emulator
« Reply #11 on: December 09, 2012, 03:55:40 pm »
Very nice. I might try it when it comes out.

Quote from: Art_of_camelot on December 08, 2012, 03:09:03 pm
Wow, great work Jim! There is also a Z80 asm implementation of this floating around on Ticalc somewhere.

Yep, it's called Vinegar, by Benryves, and it supports both CHIP-8 and SCHIP.
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Offline annoyingcalc

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Re: [Lua] CHIP-8 emulator
« Reply #12 on: December 09, 2012, 04:33:29 pm »
Vinegar also has sound O.O
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Offline Sorunome

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Re: [Lua] CHIP-8 emulator
« Reply #13 on: December 09, 2012, 05:26:09 pm »
you wrote dat emulator in lua? O.o pretty cool! :D
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Offline DJ Omnimaga

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Re: [Lua] CHIP-8 emulator
« Reply #14 on: December 09, 2012, 06:30:34 pm »
Annoyingcalc really?? O.O I didn't remember that... that's even better

Also Jim's emu is really in Lua? O.O
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