protected override void OnShown(EventArgs e)
{
base.OnShown(e);
//
int ret_init = SDL.SDL_Init(SDL.SDL_INIT_VIDEO);
if (ret_init == -1)
{
throw new Exception("Could not initialize SDL!");
}
uint retii = SDL.SDL_WasInit(SDL.SDL_INIT_VIDEO);
_sdl_formhandle = SDL.SDL_CreateWindowFrom(this.panel1.Handle);
_sdl_initSDL2 = true;
SDL.SDL_version ver;
SDL.SDL_VERSION(out ver);
this.textBox1.AppendText(string.Format("\r\nSDL {0}.{1}.{2}",
ver.major,
ver.minor,
ver.patch
));
SDL.SDL_RenderPresent(_sdl_formhandle); //刷新屏幕
this.Focus();
this.timer1.Start();
}