pong

A classic two-player Pong built in C++17 with raylib.

Two players share one keyboard, each controlling a paddle. The ball speeds up with every hit, and its bounce angle depends on where it strikes the paddle.

Gameplay

• Player 1 (left): W / S
• Player 2 (right): Up Arrow / Down Arrow
• Press Esc or close the window to quit.

Scoring happens when the ball passes behind the opponent's paddle. The score is displayed at the top of each half using a custom pixel font.

Features

• Resizable window with dynamic paddle and ball repositioning.
• Angle-based bounce physics: the ball's deflection angle depends on where it contacts the paddle surface.
• Progressive speed multiplier: both ball and paddle speed increase with each rally hit, rewarding longer exchanges.
• Brief reset cooldown after each point to prevent instant re-scoring.
• Custom pixel font rendering for the score display.

Build

Prerequisites

• CMake 3.16+
• A C++17 compiler (GCC 7+, Clang 6+)
• raylib 5.5 or newer

raylib is resolved by CMake in two steps: it first looks for an installed package; if none is found, it falls back to FetchContent and downloads raylib from source. The fallback build takes a few minutes but needs no extra setup.

Recommended: install raylib via your package manager so the build picks it up immediately.

Distro	Command
Arch	sudo pacman -S raylib
Debian / Ubuntu	sudo apt install libraylib-dev libgl1-mesa-dev libx11-dev
Fedora	sudo dnf install raylib-devel
macOS (brew)	brew install raylib

Build commands

cmake -S . -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build
./build/pong

The font (fonts/Pixeboy.ttf) is loaded from the current working directory, so run the binary from the repository root.

Technical Details

Constant	Value	Description
B_RADIUS	7	Ball radius in pixels
B_SPEED	250	Base ball speed (px/s)
P_WIDTH	15	Paddle width in pixels
P_HEIGHT	50	Paddle height in pixels
P_SPEED	350	Base paddle speed (px/s)
FPS	250	Target frame rate

Quality

find src include -type f \( -name '*.cpp' -o -name '*.h' \) -print0 \
  | xargs -0 clang-format -i

CI enforces clang-format and fails on any diff.

Project Structure

pong/
  fonts/           Pixeboy.ttf pixel font
  include/         project headers (Ball.h, Player.h)
  src/
    main.cpp       window setup, game loop, rendering, scoring
    Ball.cpp       ball movement, collision detection, bounce physics
    Player.cpp     paddle input handling and movement
  CMakeLists.txt   CMake build configuration

License

MIT. See LICENSE.