metroboy
pokegb
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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
pokegb
- McDonald's Just Dropped a Brand New Game Boy Game in 2023
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Smolnes: A NES Emulator In
This is the same person who made pokegb, a similarly tiny Game Boy emulator: https://github.com/binji/pokegb
- Pokegb – A gameboy emulator that only plays Pokemon Blue, in ~70 lines of C++
- Pokegb: A gameboy emulator that only plays Pokemon Blue, in 62 lines of C++
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POKEGB: a gameboy emulator that only plays Pokemon Blue, in 62 lines of C++
pokegb.cc (as 3 pokeballs): 9956 bytes
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.
PokeFinder - Cross platform Pokémon RNG tool
Espeon - Gameboy emulator for the ESP32
pkmn-chest - A Pokémon Bank for the 3rd through 5th generation Pokémon games for the Nintendo DS(i).
mooneye-gb - A Game Boy research project and emulator written in Rust
gbemu - A Gameboy emulator in modern C++
SkyEmu - Game Boy Advance, Game Boy, Game Boy Color, and DS Emulator
smolnes - NES emulator in <5000 bytes of C
openmoji - Open source emojis for designers, developers and everyone else!
NoobBoy - A simple GameBoy emulator written in C++
smhasher - Automatically exported from code.google.com/p/smhasher
binjnes - NES emulator implemented in C, that also runs in the browser