metroboy
SameBoy
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metroboy | SameBoy | |
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19 | 4 | |
1,089 | 1,505 | |
- | - | |
6.7 | 9.1 | |
3 months ago | 11 days ago | |
C++ | C | |
- | GNU General Public License v3.0 or later |
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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
SameBoy
- Experiences with Joey Jr
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Documentation for cycle accurate Game Boy CPU
You could also consult the SameBoy source code which is a very accurate emulator.
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Gameboy Doctor: debug and fix your gameboy emulator
Hey there! I've been working on a Game Boy emulator since last year and found the GameRoy project, which translated the PPU's logic from SameBoy, the (AFAIK) most accurate GB emulator around. I basically copied the PPU logic into my emulator and replaced the "state" property (an integer) with enums for some extra clarity.
https://github.com/nicolas-siplis/feboy
https://github.com/rodrigodd/gameroy
https://github.com/LIJI32/SameBoy/
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GameRoy: a cross platform and highly accurate Game Boy emulator
So, what I have finally tried was figure out the timing from another emulator, in this case SameBoy, which appears to be the most accurate game boy emulator. In the end, I copy the timing from its ppu state maching, and its interrupt handling code. Took a lot of time figuring out how it was working.
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.
glutin - A low-level library for OpenGL context creation, written in pure Rust.
Espeon - Gameboy emulator for the ESP32
IronBoy - A Gameboy emulator written in Rust as both a learning exercise and a love letter to the console that got me into gaming.
mooneye-gb - A Game Boy research project and emulator written in Rust
exotracker-cpp
SkyEmu - Game Boy Advance, Game Boy, Game Boy Color, and DS Emulator
sprite-render-rs - A Rust Crate for Sprite Rendering (WIP)
openmoji - Open source emojis for designers, developers and everyone else!
Dn-FamiTracker - modifications and improvements for 0CC-FamiTracker (based on j0CC-FamiTracker 0.6.3)
pokegb - A gameboy emulator that only plays Pokemon Blue, in ~50 lines of c++.
raw-gl-context - cross-platform OpenGL context creation