Gameboy Pokemon WASM Emulator

This is a Gameboy emulator[1] written by David Jolly in C. I ported, modified, and compiled it to WebAssembly.

Check it out: https://525073.gitlab-pages.ics.muni.cz/wasm-pokemon/

Pokemon Red ROM is included in the repository, bundled as an xxd output file. I had to modify the emulator to load in-compile time instead of reading it from a file, which is impossible in WASM runtime. I tried using Raylib for rendering, but even with native compilation, I could not get it working. I switched to SDL2. The emcc supports it both, making it easier to understand.

Controls

• Arrow keys: D-Pad
• J: A
• K: B
• Space: Start
• L: Select

Requirements

• sdl2
• libc
• glib2
• emscripten SDK with a functional environment
• emscripten compiler

Build

make
python3 -m http.server

Disclaimer

This project is POC, and many features are not implemented. Missing features:

• Sound
• Save/Load
• The screen could be bigger.
• Add PokemonRed.gb to the wasm environment, not as an array of bytes.
• Optimize memory and CPU resources.
• Code quality

Sources

• [1]: Based on GameBoy Emulator by David Jolly. I chose this emulator because it is lightweight and uses SDL2 or Raylib for rendering. I might switch to another emulator in the future.
• 2: Good resource: Cpp-Retro-Snake-Game-with-raylib
• 3: Article about SDL WASM support
• 4: WASMBOY, Similar project, but written in AssemblyScript