metroboy
gb-ctr
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metroboy | gb-ctr | |
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19 | 6 | |
1,089 | 308 | |
- | - | |
6.7 | 6.9 | |
3 months ago | 6 days ago | |
C++ | Typst | |
- | Creative Commons Attribution Share Alike 4.0 |
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metroboy
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When would you ever want bubblesort?
He wrote a game engine, it renders transparent items using the painter's algorithm, which requires the items to be sorted in Z. He has a routine that iterates over all items to render them, and bubble-sorts the items in-place while iterating over the items (all in the same thread). The "compare and swap" in this case is the innermost functionality of bubblesort.
I assume the author is https://github.com/aappleby but I don't see any obvious candidate for this code. Maybe this? https://github.com/aappleby/metroboy but I can't see why a gate-level emulator woudl need to render transparent items using painter's algorithm.
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Documentation for cycle accurate Game Boy CPU
If you want to go deeper, you can look at the reverse engineered schematic of most of the stuff except the CPU core in the DMG-CPU-Inside project. You could also consult the MetroBoy project, which builds on the previous project and aims to be accurate pretty much down to the logic gate level.
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Game Boy PPU Pixel Pipeine
Well then, here's the ground truth - https://github.com/aappleby/MetroBoy/blob/master/src/GateBoyLib/GateBoyPixPipe.cpp
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GameRoy: a cross platform and highly accurate Game Boy emulator
First I would try to deduce the timing from this gate-level simulation of the game boy, but the master branch was broken at the time, so I didn't manage to compile it. So, I tried deducing it from its underling reverse engineered schematics, but it would take too much time, if it even was possible.
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Is full-speed SNES possible purely in JavaScript?
You might find my hobby project interesting - https://github.com/aappleby/MetroBoy
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The tooling is the language?
Did you know the original Game Boy has non-deterministic behavior? Due to some strangeness in the integrated circuit that provides the CPU and some related parts (the SoC (system on a chip)), the same ROM may behave differently at different times when you'd think it should not. GateBoy is an attempt to make a perfect gate-level emulator for the Game Boy. Its README says:
- Good practices for Batch rendering dynamic quads.
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MetalNES: Transistor Level NES Simulation
Reminds me of GateBoy, which was posted a while back: https://news.ycombinator.com/item?id=28396927, https://github.com/aappleby/MetroBoy
GateBoy runs surprisingly fast for a gate-level simulation.
- Gameboy - Trying to understand Sprite FIFO behavior in the PPU
- Reverse-engineering the Yamaha DX7 synthesizer's sound chip from die photos
gb-ctr
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Documentation for cycle accurate Game Boy CPU
Gekkio's GB-CTR is a good reference of the SM83 (Gameboy CPU) with access pattern withM cycle accuracy. The GB-research repo by the same author also contains a lot of information.
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Need help with CPU swap of Game Boy Pocket
In case you're interested in the precise pinout, see Appendix D in gb-ctr: https://github.com/Gekkio/gb-ctr
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Game Boy PPU Pixel Pipeine
Does anyone know of good documentation beyond: - Pan Docs - The Cycle-Accurate Game Boy Docs - Complete Technical Reference - Nitty Gritty Gameboy Cycle Timing
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Best documentation for the details?
The thing about the Game Boy (or most consoles, really, but especially the Game Boy since it uses a custom CPU) is that we don't know all the details. People have had to reverse engineer it to figure stuff out. /u/gekkio is one of the people doing that work, and his technical reference and test suite are the (ongoing) results of that.
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Need some guidance about how to start
This is a great resource: the complete technical reference.
What are some alternatives?
rohd - The Rapid Open Hardware Development (ROHD) framework is a framework for describing and verifying hardware in the Dart programming language.
MagenBoy - GameBoy and GameBoy Color emulator written in Rust
Espeon - Gameboy emulator for the ESP32
gb-test-roms - Collection of Game Boy test roms.
mooneye-gb - A Game Boy research project and emulator written in Rust
pandocs - The single, most comprehensive Game Boy technical reference.
SkyEmu - Game Boy Advance, Game Boy, Game Boy Color, and DS Emulator
blarggs-test-roms - Blarggs Reproducible Gameboy Test Roms
openmoji - Open source emojis for designers, developers and everyone else!
mooneye-test-suite - Mooneye Test Suite is a suite of Game Boy test ROMs
pokegb - A gameboy emulator that only plays Pokemon Blue, in ~50 lines of c++.
gb-research - Game Boy hardware research