//Draws the image at the given coordinates.
func (me *Canvas) DrawImage(img *Image, x, y int) {
C.SDL_SetAlpha(img.img, C.SDL_SRCALPHA, 255)
var dest C.SDL_Rect
dest.x = C.Sint16(x + me.origin.X)
dest.y = C.Sint16(y + me.origin.Y)
C.SDL_BlitSurface(img.img, nil, me.pane, &dest)
}
func sdl_Rect(x, y, width, height int) C.SDL_Rect {
var r C.SDL_Rect
r.x = C.int(x)
r.y = C.int(y)
r.w = C.int(width)
r.h = C.int(height)
return r
}
func toSDL_Rect(b util.Bounds) C.SDL_Rect {
var r C.SDL_Rect
r.x = C.Sint16(b.X)
r.y = C.Sint16(b.Y)
r.w = C.Uint16(b.Width)
r.h = C.Uint16(b.Height)
return r
}
func FillRect(x, y, w, h int, c Color) {
var rect C.SDL_Rect
rect.x = C.int(x)
rect.y = C.int(y)
rect.w = C.int(w)
rect.h = C.int(h)
C.SDL_SetRenderDrawColor(renderer, C.Uint8(c.Red), C.Uint8(c.Green), C.Uint8(c.Blue), C.Uint8(c.Alpha))
C.SDL_RenderFillRect(renderer, &rect)
}
// Blit performs a fast blit from the source surface to the destination surface.
//
// srcRect represents the rectangle to be copied or image.ZR to copy the entire
// surface.
//
// dstPoint represents the destination position.
func (src *Surface) Blit(srcRect image.Rectangle, dst *Surface, dstPoint image.Point) (err error) {
cSrcRect := cRect(srcRect)
cDstRect := new(C.SDL_Rect)
cDstRect.x = C.int(dstPoint.X)
cDstRect.y = C.int(dstPoint.Y)
if C.SDL_BlitSurface(src.cSurface, cSrcRect, dst.cSurface, cDstRect) != 0 {
return getError()
}
return nil
}
//Draws the image at the given coordinates.
func DrawImage(img *Image, destX, destY, srcX, srcY, srcW, srcH int) {
var src, dest C.SDL_Rect
dest.x = C.int(destX)
dest.y = C.int(destY)
dest.w = C.int(img.Width)
dest.h = C.int(img.Height)
src.x = C.int(srcX)
src.y = C.int(srcY)
src.w = C.int(srcW)
src.h = C.int(srcH)
C.SDL_SetTextureAlphaMod(img.surface, 255)
C.SDL_RenderCopy(renderer, img.surface, &src, &dest)
}
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++
call(func(env Env) {
C.SDL_UpdateYUVTexture(env.texture, nil,
(*C.Uint8)(unsafe.Pointer(frame.data[0])), frame.linesize[0],
(*C.Uint8)(unsafe.Pointer(frame.data[1])), frame.linesize[1],
(*C.Uint8)(unsafe.Pointer(frame.data[2])), frame.linesize[2])
C.SDL_RenderCopy(env.renderer, env.texture, nil, nil)
C.SDL_RenderCopy(env.renderer, fpsTexture, &fpsSrc, &fpsDst)
C.SDL_RenderPresent(env.renderer)
decoder.RecycleFrame(frame)
})
}
}()
// start decode
decoder.Start(decoder.VideoStreams[0], decoder.AudioStreams[0], width, height)
ret := C.Pa_StartStream(audioStream)
if ret != C.paNoError {
fatalPAError(ret)
}
// main loop
var ev C.SDL_Event
env := Env{
window: window,
renderer: renderer,
texture: texture,
}
for {
if C.SDL_WaitEvent(&ev) == C.int(0) {
fatalSDLError()
}
switch C.get_event_type(&ev) {
case C.SDL_QUIT:
os.Exit(0)
case C.SDL_KEYDOWN:
key := C.get_event_key(&ev)
switch key.keysym.sym {
case C.SDLK_q: // quit
os.Exit(0)
case C.SDLK_f: // forward
decoder.Seek(time.Second * 60)
}
case C.SDL_USEREVENT:
if C.get_userevent_code(&ev) == callEventCode {
(<-callbacks)(env)
}
}
}
}
//Draws the text at the given coordinates.
func (me *Canvas) DrawText(text *Text, x, y int) {
var dest C.SDL_Rect
dest.x = C.Sint16(x + me.origin.X)
dest.y = C.Sint16(y + me.origin.Y)
C.SDL_BlitSurface(text.text, nil, me.pane, &dest)
}