Small but complete C/C++ and OpenGL 3D graphics engine. It works as a standalone graphics library that can be plugged into any project that needs rendering, this way it serves as a submodule of the game engine BulletEngine. It can also be used independently as a standalone editor tool.

Until now it grew on its own, in a vacuum, though always with the game engine in mind. From here it grows alongside it, driven by what the engine turns out to need.

Features

• Scene owns models, lights and cameras, objects form parent-child hierarchy with local and world transforms
• Rendering through configurable passes, base pass draws geometry with phong shading, pre and post passes (grid, world axis, skybox, fog)
• Lighting with ambient, directional, point and spot sources, directional and spot ones cast shadows through shadow maps
• Cameras of three kinds, static one looks at target, fly one moves with WASD and mouse, orbit one rotates around point
• Materials carry phong terms and named texture slots, values not set fall back to what came with the model
• Models load from obj with materials and textures, or come from built-in primitives
• Canvas draws flat over the frame in pixels, takes shapes, images and text from ttf
• Debug view draws gizmos for transforms, lights, cameras and object bounds
• Editor gives side panel with scene hierarchy, inspector and settings, everything in scene is created and edited at runtime

Dependencies

Requires C++20 and an OpenGL-capable graphics stack.

System libraries, expected to be installed:

• OpenGL
• GLFW
• GLM

Bundled in external/:

• glad for OpenGL loading
• Dear ImGui for interfaces
• tinyobjloader for obj parsing
• stb_image for texture loading
• stb_truetype for font rasterizing

Structure

src/
├── app/          window and main loop
├── scene/        scene, objects, cameras, lights, models
├── render/       renderer, passes, materials, textures, fonts
├── interface/    editor (only in standalone build)
└── utils/