func main() {
var window *sdl.Window
var renderer *sdl.Renderer
var image *sdl.Surface
var texture *sdl.Texture
var src, dst sdl.Rect
window = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
winWidth, winHeight, 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)
if renderer == nil {
fmt.Fprintf(os.Stderr, "Failed to create renderer: %s\n", sdl.GetError())
os.Exit(2)
}
image = sdl.LoadBMP(imageName)
if image == nil {
fmt.Fprintf(os.Stderr, "Failed to load BMP: %s", sdl.GetError())
os.Exit(3)
}
texture = renderer.CreateTextureFromSurface(image)
if texture == nil {
fmt.Fprintf(os.Stderr, "Failed to create texture: %s\n", sdl.GetError())
os.Exit(4)
}
src = sdl.Rect{0, 0, 512, 512}
dst = sdl.Rect{100, 50, 512, 512}
renderer.Clear()
renderer.Copy(texture, &src, &dst)
renderer.Present()
sdl.Delay(2000)
image.Free()
texture.Destroy()
renderer.Destroy()
window.Destroy()
}
func MainLoop(renderer *sdl.Renderer, font *ttf.Font) {
lastTick := sdl.GetTicks()
lastSecond := lastTick
frames := 0
fpsText := gfx.CreateText(renderer, font, "FPS: ... "+StatusCallback(), sdl.Color{255, 255, 255, 255})
framesPerSecond := 0
for running {
tick := sdl.GetTicks()
if tick < lastTick+10 {
sdl.Delay(1)
continue
}
delta := float64(tick-lastTick) / 1000.0
lastTick = tick
fpsText.Destroy()
fpsText = gfx.CreateText(renderer, font, fmt.Sprintf("FPS: %3d ", framesPerSecond)+StatusCallback(), sdl.Color{255, 255, 255, 255})
if tick > (lastSecond + 1000) {
lastSecond = tick
framesPerSecond = frames
frames = 0
} else {
frames++
}
handleEvents()
UpdateCallback(delta)
renderer.SetDrawColor(0, 0, 0, 0)
renderer.Clear()
RenderCallback(renderer)
gfx.RenderTexture(renderer, fpsText, 0, 0)
renderer.Present()
}
fpsText.Destroy()
}