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Simple Ray-Casting Engine

Navigating the maze Navigating the map

A simple first-person ray-casting engine built in C++ using SDL2. The idea is to make a light platform agnostic minimalistic fps engine that can run on virtually any hardware.

Features

  • Real-time ray-casting rendering
  • Player movement (WASD controls)
  • Toggle between 2D map view and 3D perspective (E key)
  • Distance-based lighting effects
  • Fixed-point arithmetic for performance

Project Structure

/
├── src/                 # Game source code
│   ├── main.cpp         # Main game loop
│   ├── graphics.cpp     # Rendering functions
│   ├── map.cpp          # Map rendering
│   ├── player.cpp       # Player logic and ray-casting
│   ├── pfloat.h         # Papi3D Float Implementation
└   └── constants.cpp    # App constants

Controls

  • W/S: Move forward/backward
  • A/D: Turn left/right
  • E: Toggle between 2D map view and 3D view
  • Q or ESC: Quit the game

Technical Details

  • Uses fixed-point arithmetic for better performance
  • Ray-casting algorithm with DDA (Digital Differential Analyzer)
  • Software rendering directly to SDL2 surface

Next steps

  • We will decouple the project from SDL2 to make it easier to port to more platforms, including those with limited hardware.

License

This project uses SDL2, which is licensed under the zlib license. See the SDL2 source code for details.