AppFlow

Application Flow

**Last revision:** ver. 3.1 - 29 October 2012 (This is a preliminary / work in progress document and may be incomplete)

Application Flow

*^An overview of the omegalib application flow.^*

Render Loop

What follows is an example call stack to a render pass draw function, indicating the main purpose of functions in the call stack:

• RenderPass::render: rendering happens here. Custom applications and frontends (omegaOsg and omegaVtk) reimplement this module.
• Renderer::innerDraw: iterate render passes and invoke draw functions
• Renderer::draw: setup per-context resources and cameras
• ChannelImpl::frameDraw set up omegalib draw context
• eq::Channel::_cmdFrameDraw, co::CommandFunc::operator, co::Command::invoke (Equalizer) draw command dispatch
• eq::Pipe::_runThread main render loop
• co::base::Thread::_runChild, co::base::Thread::runChild render loop initialization
• pthread threadStart thread entry point

Application update loop

This is an example call stack to an engine module update function. Event handling follows a similar call structure.

• Module::update: update happens here
• ModuleServices::update: interate modules and invoke update functions
• Engine::update: perform update of internal omegalib data, update interpreter state, update sound environment
• ConfigImpl::startFrame: handle event dispatch and global timer
• EqualizerDisplaySystem::run: application main loop
• SystemManager::run: initialize all omegalib facilities
• omain: omegalib main function. Process command line arguments and setup system manager.
• main