SDL2 for with CMake

This repository contains simple projects demonstrating the use of SDL2.

Setup with CMake

• cd into the root folder of the repository.
• Run cmake -B build -S . to generate the build files. Dependencies are fetched automatically via CMake FetchContent.
• cd build into the build folder.
• Run make to build the projects.

Projects

• 1-stamp: Basic window that allows stamping images with the mouse.
  • To run, execute ./1-stamp from the build folder.
• 2-sketchpad: A mini sketchpad application that allows drawing with the mouse, resizing cursor and changing colors.
  • To run, execute ./2-sketchpad from the build folder.
• 3-connect4: A simple Connect 4 game with basic AI.
  • Uses alpha-beta pruning for the AI.
  • Multithreaded to keep the UI responsive during AI calculations.
  • Animated piece dropping effect.
  • To run, execute ./3-connect4 from the build folder.
• 4-dragbox: A simple drag-and-drop box for trying out SDL2 TTF
  • To run, execute ./4-dragbox from the build folder.
• 5-snake: Snake game using ImGui for menu screens
  • To run, execute ./5-snake from the build folder.
• 6-particlebox: Particle physics simulation with ImGui settings panel
  • Configurable particle count, radius range, mass range, gravity, and collision restitution (0–2, sub-elastic to super-elastic)
  • Per-particle mass with mass-weighted elastic collisions; hue-based coloring (blue=light, red=heavy)
  • Arena-allocated quadtree for O(n log n) spatial collision queries instead of brute-force O(n²)
  • Multiple multithreading modes selectable at runtime: graph coloring (lock-free), mutex locks, unsafe (no lock), and naive N²
  • Lock-free parallel collision resolution via greedy graph coloring — pairs are partitioned into conflict-free batches so no two pairs in a batch share a particle
  • Cache-friendly compact particle layout and chunked quadtree storage to reduce allocation overhead
  • To run, execute ./6-particlebox from the build folder.