Golang sdl.Init函数代码示例

// Initializes SDL
func (e *Engine) Init() (err error) {
	err = sdl.Init(sdl.INIT_VIDEO | sdl.INIT_AUDIO)
	if err != nil {
		return
	}

	err = mix.Init(mix.INIT_OGG)
	if err != nil {
		return
	}

	err = ttf.Init()
	if err != nil {
		return
	}

	err = mix.OpenAudio(mix.DEFAULT_FREQUENCY, mix.DEFAULT_FORMAT, mix.DEFAULT_CHANNELS, 3072)
	if err != nil {
		return
	}

	e.Window, err = sdl.CreateWindow(WinTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, WinWidth, WinHeight, sdl.WINDOW_SHOWN)
	if err != nil {
		return
	}

	e.Renderer, err = sdl.CreateRenderer(e.Window, -1, sdl.RENDERER_ACCELERATED)
	if err != nil {
		return
	}

	return
}

/*
Build creates a Controller struct. NOTE: locks the OS thread. Make sure to call
all Controller.func from the exact same goroutine, otherwise the SDL context
may crash!
*/
func Build() (*Controller, error) {
	// MUST guarantee controller always runs in same OS thread
	runtime.LockOSThread()
	sdl.Init(sdl.INIT_EVERYTHING)
	// prepare basic Controller stuff
	c := &Controller{}
	c.renderable = makeOrdered()
	c.entities = make(map[string]interface{})
	c.keyreceivers = make(map[string][]*keyReceive)
	c.textCache = make(map[string]*sdl.Texture)
	// window
	window, err := sdl.CreateWindow("Orbiting", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, 800, 600, sdl.WINDOW_SHOWN)
	if err != nil {
		return nil, err
	}
	c.window = window
	// create renderer (reference kept by window, no need to do it ourselves)
	renderer, err := sdl.CreateRenderer(c.window, -1, 0)
	if err != nil {
		return nil, err
	}
	// however, we DO want to keep just a single instance of the wrapper
	c.wrapped = &Renderer{renderer: renderer}
	return c, nil
}

func main() {
	if err := sdl.Init(sdl.INIT_AUDIO); err != nil {
		log.Println(err)
		return
	}

	if err := mix.Init(mix.INIT_MP3); err != nil {
		log.Println(err)
		return
	}
	defer sdl.Quit()
	defer mix.Quit()
	defer mix.CloseAudio()

	if err := mix.OpenAudio(22050, mix.DEFAULT_FORMAT, 2, 4096); err != nil {
		log.Println(err)
		return
	}

	if music, err := mix.LoadMUS("test.mp3"); err != nil {
		log.Println(err)
	} else if err = music.Play(1); err != nil {
		log.Println(err)
	} else {
		sdl.Delay(5000)
		music.Free()
	}
}

func start() {
	if sdl.Init(sdl.INIT_AUDIO) < 0 {
		fmt.Fprintf(os.Stderr, "Failed to init:", sdl.GetError())
		os.Exit(1)
	}

	window = sdl.CreateWindow("test", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
		int(W), int(H), sdl.WINDOW_SHOWN)
	if window == nil {
		fmt.Fprintf(os.Stderr, "Failed to create window: %s\n", sdl.GetError())
		os.Exit(1)
	}

	renderer = sdl.CreateRenderer(window, -1, sdl.RENDERER_ACCELERATED|sdl.RENDERER_PRESENTVSYNC)
	if renderer == nil {
		fmt.Fprintf(os.Stderr, "Failed to create renderer: %s\n", sdl.GetError())
		os.Exit(1)
	}

	mix.SetSoundFonts("resources/")
	if !mix.OpenAudio(44100, mix.DEFAULT_FORMAT, 2, 2048) {
		fmt.Fprintf(os.Stderr, "Failed to open audio:%s\n", sdl.GetError())
		os.Exit(1)
	}

}

func (dmg *DMG) Run(file string, width, height int) {
	sdl.Init(sdl.INIT_VIDEO)
	defer sdl.Quit()

	dmg.init(file, width, height)
	dmg.exec()
}

func Init() error {
	// This is needed to make sure that we are always running the graphics code in the same OS thread as it is initialized in.
	runtime.LockOSThread()
	if runtime.GOMAXPROCS(-1) == 1 {
		runtime.GOMAXPROCS(2)
	}
	return sdl.Init(sdl.INIT_EVERYTHING)
}

func OpenDisplay(width uint32, height uint32) (*Display, error) {
	display := Display{}

	sdl.Init(sdl.INIT_EVERYTHING)
	window, err := sdl.CreateWindow("test", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, int(width), int(height), sdl.WINDOW_SHOWN)
	if err != nil {
		return nil, err
	}
	display.window = window

	return &display, nil
}

// NewAdaptor returns a new Joystick Adaptor.
func NewAdaptor() *Adaptor {
	return &Adaptor{
		name: "Joystick",
		connect: func(j *Adaptor) (err error) {
			sdl.Init(sdl.INIT_JOYSTICK)
			if sdl.NumJoysticks() > 0 {
				j.joystick = sdl.JoystickOpen(0)
				return
			}
			return errors.New("No joystick available")
		},
	}
}

// NewJoystickAdaptor returns a new JoystickAdaptor with specified name.
func NewJoystickAdaptor(name string) *JoystickAdaptor {
	return &JoystickAdaptor{
		name: name,
		connect: func(j *JoystickAdaptor) (err error) {
			sdl.Init(sdl.INIT_JOYSTICK)
			if sdl.NumJoysticks() > 0 {
				j.joystick = sdl.JoystickOpen(0)
				return
			}
			return errors.New("No joystick available")
		},
	}
}

func main() {
	var winTitle string = "Go-SDL2 + Go-GL"
	var winWidth, winHeight int = 800, 600
	var window *sdl.Window
	var context sdl.GLContext
	var event sdl.Event
	var running bool
	var err error

	if err = sdl.Init(sdl.INIT_EVERYTHING); err != nil {
		panic(err)
	}
	defer sdl.Quit()

	if err = gl.Init(); err != nil {
		panic(err)
	}

	window, err = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
		winWidth, winHeight, sdl.WINDOW_OPENGL)
	if err != nil {
		panic(err)
	}
	defer window.Destroy()
	context, err = sdl.GL_CreateContext(window)
	if err != nil {
		panic(err)
	}
	defer sdl.GL_DeleteContext(context)

	gl.Enable(gl.DEPTH_TEST)
	gl.ClearColor(0.2, 0.2, 0.3, 1.0)
	gl.ClearDepth(1)
	gl.DepthFunc(gl.LEQUAL)
	gl.Viewport(0, 0, int32(winWidth), int32(winHeight))

	running = true
	for running {
		for event = sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
			switch t := event.(type) {
			case *sdl.QuitEvent:
				running = false
			case *sdl.MouseMotionEvent:
				fmt.Printf("[%d ms] MouseMotion\tid:%d\tx:%d\ty:%d\txrel:%d\tyrel:%d\n", t.Timestamp, t.Which, t.X, t.Y, t.XRel, t.YRel)
			}
		}
		drawgl()
		sdl.GL_SwapWindow(window)
	}
}

func initSDL() *sdl.Window {
	sdl.Init(sdl.INIT_EVERYTHING)

	window, err := sdl.CreateWindow("Game of Life",
		sdl.WINDOWPOS_UNDEFINED,
		sdl.WINDOWPOS_UNDEFINED,
		1280, 720,
		sdl.WINDOW_OPENGL)
	if err != nil {
		panic(err)
	}

	return window
}

func (engine *GameEngine) Init(name string) {
	sdl.Init(sdl.INIT_EVERYTHING)
	ttf.Init()

	engine.window = sdl.CreateWindow(name, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, 800, 600, sdl.WINDOW_SHOWN)
	engine.renderer = sdl.CreateRenderer(engine.window, -1, sdl.RENDERER_ACCELERATED|sdl.RENDERER_PRESENTVSYNC)
	engine.Input = &InputHandler{}
	engine.Assets = &AssetsManager{}

	engine.Input.Init()
	engine.Assets.Init(engine)

	engine.Running = true
	engine.states = NewStack()
}

func run() int {
	var window *sdl.Window
	var font *ttf.Font
	var surface *sdl.Surface
	var solid *sdl.Surface
	var err error

	sdl.Init(sdl.INIT_VIDEO)

	if err := ttf.Init(); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to initialize TTF: %s\n", err)
		return 1
	}

	if window, err = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, winWidth, winHeight, sdl.WINDOW_SHOWN); err != nil {
		fmt.Fprintf(os.Stderr, "Failed to create window: %s\n", err)
		return 2
	}
	defer window.Destroy()

	if font, err = ttf.OpenFont("../../assets/test.ttf", 32); err != nil {
		fmt.Fprint(os.Stderr, "Failed to open font: %s\n", err)
		return 4
	}
	defer font.Close()

	if solid, err = font.RenderUTF8_Solid("Hello, World!", sdl.Color{255, 0, 0, 255}); err != nil {
		fmt.Fprint(os.Stderr, "Failed to render text: %s\n", err)
		return 5
	}
	defer solid.Free()

	if surface, err = window.GetSurface(); err != nil {
		fmt.Fprint(os.Stderr, "Failed to get window surface: %s\n", err)
		return 6
	}

	if err = solid.Blit(nil, surface, nil); err != nil {
		fmt.Fprint(os.Stderr, "Failed to put text on window surface: %s\n", err)
		return 7
	}

	// Show the pixels for a while
	window.UpdateSurface()
	sdl.Delay(3000)

	return 0
}

func sdlInit() {

	sdl.Init(sdl.INIT_EVERYTHING)

	// init the image subsystem
	imgFlags := img.INIT_PNG | img.INIT_JPG

	if imgFlags != img.Init(imgFlags) {
		panic(fmt.Sprintf("Error initializing img: %v\n", img.GetError()))
	}

	// init the TTF subsystem
	if err := ttf.Init(); err != nil {
		panic(fmt.Sprintf("Error initializing ttf: %v\n", err))
	}
}

func main() {

	if len(os.Args) < 2 {
		fmt.Println("usage: emuChip8 <game>")
		os.Exit(1)
	}

	sdl.Init(sdl.INIT_EVERYTHING)
	window, err := sdl.CreateWindow("Chip8", sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
		WIN_WIDTH, WIN_HEIGHT, sdl.WINDOW_SHOWN)

	if err != nil {
		panic(err)
	}
	defer window.Destroy()

	surface, err := window.GetSurface()
	if err != nil {
		panic(err)
	}

	chip := new(Chip8)
	chip.surface = surface
	chip.init()
	chip.loadGame(os.Args[1])

	chip.quit = false
	for !chip.quit {

		if err := chip.emulateCycle(); err != nil {
			fmt.Println(err)
		}

		if chip.drawFlag {
			chip.drawGraphics()
			window.UpdateSurface()
			chip.drawFlag = false
		}

		chip.setKeys()
		sdl.Delay(1)

	}

	chip.cleanup()

}