IAppSystem Derived Systems

Gui:

• IVGui - Interface to core vgui components

Rendering:

• IStudioRender - Studio Render interface
• IStudioDataCache - Responsible for caching studio render data (models, etc.)
• IMaterialSystem - Responsible for managing and rendering materials and their components including shaders and textures. Can be thought of as essentially a DirectX wrapper that also handles texture and shader loading.

Audio:

• ISoundEmmiterSystemBase - Base class for sound emitter system handling

Console:

• ICVar - DLL interface for ConVars and ConCommands.

Physics:

• IPhysics

File IO:

• IFileSystem - Provides file loading and parsing functions

Platform Interface:

• ISurface - Wraps contextless windows system functions