bitbranchi/sdl-skeleton

How bitbranchi/sdl-skeleton works

SDL-Skeleton is reusable SDL2 game boilerplate: the application initializes SDL and its renderer, advances input and UI state each frame, updates the camera, and presents the frame. Its reusable capabilities include camera and input helpers, cached texture and audio resources, and a stateful immediate-mode UI with widgets, themes, animation, text, and drawing. The README describes the project only at a high level; several subsystem relationships below are supported by the source index rather than inspected implementations.

Main entry points: game.cpp Game Loop · ImState.h Widget State · UIDraw.h UI Drawing · UIText.h Text Textures

Components 21

Game Runtime

Application Entry src/main.cpp
Game Loop src/game.cpp
Input State src/input.h
Camera src/camera.h

Resources and Audio

Texture Cache src/resource_manager.h
Texture Definitions src/texture.h
Sound Manager src/sound_manager.h
Sound Definitions src/sound.h

UI Framework

UI Widgets src/ui/ImWidgets.h
Widget State src/ui/ImState.h
UI Themes src/ui/core/Theme.h
UI Drawing src/ui/core/UIDraw.h
UI Input src/ui/core/UIInput.h
UI Context src/ui/core/UIContext.h
Text Textures src/ui/core/UIText.h
Font Cache src/ui/core/UIFont.h
Font Definitions src/ui/core/font.h
UI Animation src/ui/core/Tween.h
UI Geometry src/ui/core/UITypes.h

Utilities

Random Helpers src/util/randomizer.h
Vector Math src/util/vector2.hpp

Connections 27

Application Entry → Game Loop: starts src/main.cpp
Game Loop → Input State: updates src/game.cpp
Game Loop → Camera: updates src/game.cpp
Game Loop → Texture Cache: initializes src/game.cpp
Game Loop → Sound Manager: initializes src/game.cpp
Game Loop → Widget State: begins frame src/game.cpp
Game Loop → UI Drawing: presents via src/game.cpp
Texture Cache → Texture Definitions: loads definitions src/resource_manager.h
Sound Manager → Sound Definitions: loads definitions src/sound_manager.h
UI Widgets → Widget State: uses state src/ui/ImWidgets.h
Widget State → UI Themes: reads theme src/ui/ImState.h
Widget State → UI Animation: advances animation src/ui/ImState.h
Widget State → Text Textures: caches text src/ui/ImState.h
Widget State → UI Drawing: resets drawing src/ui/ImState.h
UI Drawing → Texture Cache: gets textures src/ui/core/UIDraw.h
UI Drawing → UI Themes: uses styles src/ui/core/UIDraw.h
UI Drawing → UI Context: uses renderer src/ui/core/UIDraw.h
UI Drawing → Text Textures: draws text src/ui/core/UIDraw.h
UI Context → Font Cache: clears fonts src/ui/core/UIContext.h
Text Textures → UI Context: uses renderer src/ui/core/UIText.h
Text Textures → Font Cache: gets fonts src/ui/core/UIText.h
Font Cache → Font Definitions: reads paths src/ui/core/UIFont.h
UI Input → Input State: reads input src/ui/core/UIInput.h
Camera → UI Geometry: uses geometry src/camera.h
Camera → Vector Math: uses vectors src/camera.h
Input State → Vector Math: uses vectors src/input.h
Random Helpers → Vector Math: uses vectors src/util/randomizer.h

Drawn by GitDiagram on November 13, 2026 from the repository's file tree, README and source files. Read as Markdown ·