Function Run

engo.go:158–232

Run is called to create a window, initialize everything, and start the main loop. Once this function returns, the game window has been closed already. You can supply a lot of options within `RunOptions`, and your starting `Scene` should be defined in `defaultScene`.

(o RunOptions, defaultScene Scene)

// the game window has been closed already. You can supply a lot of options within `RunOptions`, and your starting
// `Scene` should be defined in `defaultScene`.
func Run(o RunOptions, defaultScene Scene) {
	// Setting defaults
	if o.FPSLimit == 0 {
		o.FPSLimit = 60
	}

	if o.MSAA < 0 {
		panic("MSAA has to be greater or equal to 0")
	}

	if o.MSAA == 0 {
		o.MSAA = 1
	}

	if len(o.AssetsRoot) == 0 {
		o.AssetsRoot = "assets"
	}

	if o.Update == nil {
		o.Update = &ecs.World{}
	}

	if o.GlobalScale.X <= 0 || o.GlobalScale.Y <= 0 {
		o.GlobalScale = Point{X: 1, Y: 1}
	}

	opts = o

	// Create input
	Input = NewInputManager()
	if opts.StandardInputs {
		log.Println("Using standard inputs")

		Input.RegisterButton("jump", KeySpace)
		Input.RegisterButton("action", KeyEnter)

		Input.RegisterAxis(DefaultHorizontalAxis, AxisKeyPair{KeyA, KeyD}, AxisKeyPair{KeyArrowLeft, KeyArrowRight})
		Input.RegisterAxis(DefaultVerticalAxis, AxisKeyPair{KeyW, KeyS}, AxisKeyPair{KeyArrowUp, KeyArrowDown})

		Input.RegisterAxis(DefaultMouseXAxis, NewAxisMouse(AxisMouseHori))
		Input.RegisterAxis(DefaultMouseYAxis, NewAxisMouse(AxisMouseVert))
	}

	Files.SetRoot(opts.AssetsRoot)
	currentUpdater = opts.Update

	// And run the game
	if opts.HeadlessMode {
		if opts.Width == 0 {
			opts.Width = headlessWidth
		}
		if opts.Height == 0 {
			opts.Height = headlessHeight
		}
		windowWidth = float32(opts.Width)
		windowHeight = float32(opts.Height)
		gameWidth = float32(opts.Width)
		gameHeight = float32(opts.Height)