Method Run

app/app-desktop.go:64–100

Run starts the update loop. It calls the user-provided update function every frame.

(update func(rend *renderer.Renderer, deltaTime time.Duration))

// Run starts the update loop.
// It calls the user-provided update function every frame.
func (a *Application) Run(update func(rend *renderer.Renderer, deltaTime time.Duration)) {

	// Initialize start and frame time
	a.startTime = time.Now()
	a.frameStart = time.Now()

	// Set up recurring calls to user's update function
	for {
		// If Exit() was called or there was an attempt to close the window dispatch OnExit event for subscribers.
		// If no subscriber cancelled the event, terminate the application.
		if a.IWindow.(*window.GlfwWindow).ShouldClose() {
			a.Dispatch(OnExit, nil)
			// TODO allow for cancelling exit e.g. showing dialog asking the user if he/she wants to save changes
			// if exit was cancelled {
			//     a.IWindow.(*window.GlfwWindow).SetShouldClose(false)
			// } else {
			break
			// }
		}
		// Update frame start and frame delta
		now := time.Now()
		a.frameDelta = now.Sub(a.frameStart)
		a.frameStart = now
		// Call user's update function
		update(a.renderer, a.frameDelta)
		// Swap buffers and poll events
		a.IWindow.(*window.GlfwWindow).SwapBuffers()
		a.IWindow.(*window.GlfwWindow).PollEvents()
	}

	// Close default audio device
	if a.audioDev != nil {
		al.CloseDevice(a.audioDev)
	}
	// Destroy window
	a.Destroy()
}

// Exit requests to terminate the application
// Application will dispatch OnQuit events to registered subscribers which