This inheritance list is sorted roughly, but not completely, alphabetically:

[detail level 12]

CAbstractParticleSystem	Abstract additive point‑sprite particle system with a ready‑made GL path
CCamera
CCharPosition	Character box in a bitmap atlas
CCharTex	Texture + transform bundle for a single glyph used by FontEngine
CDimensions	Simple pixel/viewport dimensions with an aspect ratio helper
Cstd::exception
CBMP::BMPException	Exception type thrown by BMP I/O helpers
CGLException	Exception used for OpenGL-related failures
CImageLoader::Exception	Exception type thrown by ImageLoader on failures
CProgramException	Exception thrown for program/shader I/O or linkage failures
CFontEngine	OpenGL-based text drawer using per-character textures (or SDFs)
CFontRenderer	CPU-side text compositor using a bitmap atlas and character boxes
CGLApp	Simple app runner with a GL context, stock shaders, and draw helpers
CGLArray
CGLBuffer
CGLDepthBuffer
CGLDepthTexture
CGLEnv	Window/context manager for OpenGL (GLFW+GLEW) or WebGL (Emscripten)
CGLFramebuffer
CGLProgram	OpenGL shader program with helpers for creation and data binding
CGLTexInfo
CGLTexture1D
CGLTexture2D
CGLTexture3D
CGLTextureCube	OpenGL cube map texture (6 faces) with convenience upload helpers
CGrid2D
CImage
CMat3t< T >
CMat4t< T >
COBJFile
CRandom
Cstbi_io_callbacks
CMat4t< T >::StereoMatrices	Bundle of left/right view and projection matrices for stereo
CVec2t< T >
CVec3t< T >
CVec4t< T >