SDL3 + Dear ImGui Demo

A minimal C++ project demonstrating SDL3 and Dear ImGui integrated via CMake's FetchContent — no manual dependency installation required.

Features

• Zero-setup dependencies — all libraries are fetched and built automatically at configure time
• SDL3 for windowing, rendering, and input
• Dear ImGui for immediate-mode GUI
• Single demo file showing a working render loop with ImGui widgets

Requirements

• CMake ≥ 3.24
• A C++17 compiler (GCC, Clang, or MSVC)
• An internet connection (for FetchContent to download dependencies)

Building

cmake -B build 
or
cmake -S . -B build -G "Visual Studio 18 2026" -A x64

cmake --build build

Running

./build/demo

A window will open with an ImGui demo panel. Close the window to exit.

Project Structure

├── CMakeLists.txt
├── src/
│   └── main.cpp        # Demo: SDL3 window + ImGui render loop
└── README.md

How It Works

CMakeLists.txt uses FetchContent to pull:

Dependency	Source
SDL3	https://github.com/libsdl-org/SDL
Dear ImGui	https://github.com/ocornut/imgui

Both are built as part of the project — nothing is installed system-wide.

License

This project is in the public domain.