Golang C.Sint32函數代碼示例

func (this Surface) UpdateRect(rect Rect) {
	c_surface := (*C.SDL_Surface)(this.Ptr)
	c_x := C.Sint32(rect.X)
	c_y := C.Sint32(rect.Y)
	c_w := C.Uint32(rect.W)
	c_h := C.Uint32(rect.H)
	C.SDL_UpdateRect(c_surface, c_x, c_y, c_w, c_h)
}

// Makes sure the given area is updated on the given screen.  If x, y, w, and
// h are all 0, the whole screen will be updated.
func (screen *Surface) UpdateRect(x int32, y int32, w uint32, h uint32) {
	GlobalMutex.Lock()
	screen.mutex.Lock()

	C.SDL_UpdateRect(screen.cSurface, C.Sint32(x), C.Sint32(y), C.Uint32(w), C.Uint32(h))

	screen.mutex.Unlock()
	GlobalMutex.Unlock()
}

// Makes sure the given area is updated on the given screen.  If x, y, w, and
// h are all 0, the whole screen will be updated.
func (screen *Surface) UpdateRect(x int32, y int32, w uint32, h uint32) {
	C.SDL_UpdateRect((*C.SDL_Surface)(cast(screen)), C.Sint32(x), C.Sint32(y), C.Uint32(w), C.Uint32(h))
}

func main() {
	runtime.GOMAXPROCS(32)

	// sdl
	C.SDL_Init(C.SDL_INIT_AUDIO | C.SDL_INIT_VIDEO | C.SDL_INIT_TIMER)
	defer C.SDL_Quit()
	runtime.LockOSThread()
	window := C.SDL_CreateWindow(C.CString("play"), 0, 0, 1680, 1050,
		C.SDL_WINDOW_BORDERLESS|C.SDL_WINDOW_RESIZABLE|C.SDL_WINDOW_MAXIMIZED|C.SDL_WINDOW_OPENGL)
	if window == nil {
		fatalSDLError()
	}
	defer C.SDL_DestroyWindow(window)
	C.SDL_DisableScreenSaver()
	renderer := C.SDL_CreateRenderer(window, -1, C.SDL_RENDERER_ACCELERATED)
	if renderer == nil {
		fatalSDLError()
	}
	defer C.SDL_DestroyRenderer(renderer)
	var width, height C.int
	C.SDL_GetWindowSize(window, &width, &height)
	texture := C.SDL_CreateTexture(renderer,
		C.SDL_PIXELFORMAT_YV12,
		C.SDL_TEXTUREACCESS_STREAMING,
		width, height)
	if texture == nil {
		fatalSDLError()
	}
	defer C.SDL_DestroyTexture(texture)

	// sdl ttf
	if C.TTF_Init() == C.int(-1) {
		log.Fatal("sdl ttf init failed")
	}
	defer C.TTF_Quit()
	font := C.TTF_OpenFont(C.CString("/home/reus/font.ttf"), 32)
	if font == nil {
		fatalTTFError()
	}
	defer C.TTF_CloseFont(font)

	// open decoder
	decoder, err := NewDecoder(os.Args[1])
	if err != nil {
		log.Fatal(err)
	}
	if len(decoder.AudioStreams) == 0 || len(decoder.VideoStreams) == 0 {
		log.Fatal("no video or audio")
	}
	defer decoder.Close()

	// audio
	aCodecCtx := decoder.AudioStreams[0].codec
	audioStream := setupAudioOutput(int(aCodecCtx.sample_rate), int(aCodecCtx.channels), decoder)

	// call closure in sdl thread
	callEventCode := C.SDL_RegisterEvents(1)
	callbacks := make(chan func(Env), 1024)
	call := func(f func(env Env)) {
		var event C.SDL_Event
		var userevent C.SDL_UserEvent
		userevent._type = C.SDL_USEREVENT
		userevent.code = C.Sint32(callEventCode)
		C.set_userevent(&event, userevent)
		callbacks <- f
		C.SDL_PushEvent(&event)
	}

	// show fps
	nFrames := 0
	var fpsTexture *C.SDL_Texture
	var fpsColor C.SDL_Color
	var fpsSrc, fpsDst C.SDL_Rect
	fpsColor.r = 255
	fpsColor.g = 255
	fpsColor.b = 255
	fpsColor.a = 0
	go func() {
		for _ = range time.NewTicker(time.Second * 1).C {
			call(func(env Env) {
				cText := C.CString(fmt.Sprintf("%d", nFrames))
				sur := C.TTF_RenderUTF8_Blended(font, cText, fpsColor)
				fpsSrc.w = sur.w
				fpsSrc.h = sur.h
				fpsDst.w = sur.w
				fpsDst.h = sur.h
				C.SDL_DestroyTexture(fpsTexture)
				fpsTexture = C.SDL_CreateTextureFromSurface(env.renderer, sur)
				C.SDL_FreeSurface(sur)
				C.free(unsafe.Pointer(cText))
				nFrames = 0
			})
		}
	}()

	// render
	go func() {
		for {
			frame := <-decoder.timedFrames
			nFrames++
//.........這裏部分代碼省略.........

// Makes sure the given list of rectangles is updated on the given screen.
// If 'x', 'y', 'w' and 'h' are all 0, SDL_UpdateRect will update the entire
// screen.
// These functions should not be called while 'screen' is locked.
// extern DECLSPEC void SDLCALL SDL_UpdateRects
//		(SDL_Surface *screen, int numrects, SDL_Rect *rects);
func updateRect(screen *C.SDL_Surface, x, y int32, w, h uint32) {
	C.SDL_UpdateRect(screen, C.Sint32(x), C.Sint32(y), C.Uint32(w), C.Uint32(h))
}