public void Run()
{
Threading.RegisterUIThread();
Init();
Load();
//Game loop
running = true;
#if DEBUGMAC
ulong last = SDL2.SDL_GetPerformanceCounter();
ulong startTick = last;
#else
var timer = new Stopwatch();
timer.Start();
double last = 0.0;
#endif
double elapsed = 0.0;
/*
* DEBUGMAC Define:
* Use SDL2_GetTicks (less accurate) instead of Stopwatch
* Xamarin Studio Debugger crashes on Mac with Stopwatch
* DEBUGMAC not required for other platforms
*/
while (running)
{
//SDL2 events
ProcessEvents();
//Run code for UI thread
Threading.Update();
//Run game code
#if DEBUGMAC
ulong currentTicks = SDL2.SDL_GetPerformanceCounter();
var current = (double)(currentTicks - startTick) / (double)SDL2.SDL_GetPerformanceFrequency();
var t = new GameTime(TimeSpan.FromSeconds(elapsed), TimeSpan.FromSeconds(current));
#else
var t = new GameTime(TimeSpan.FromSeconds(elapsed), timer.Elapsed);
#endif
if (running)
{
Update(t);
}
if (running)
{
GL.glClearColor(0f, 0f, 0f, 1f);
GL.glClear(GL.GL_COLOR_BUFFER_BIT);
Draw(t);
}
//Time
#if DEBUGMAC
elapsed = (double)(currentTicks - last) / (double)SDL2.SDL_GetPerformanceFrequency();
last = currentTicks;
#else
elapsed = timer.Elapsed.TotalSeconds - last;
last = timer.Elapsed.TotalSeconds;
#endif
if (elapsed < 0)
{
elapsed = 0;
//apparently this can happen?
Console.WriteLine("Stopwatch returned negative time");
}
SDL2.SDL_GL_SwapWindow(Window.Handle);
System.Threading.Thread.Sleep(0);
}
#if !DEBUGMAC
timer.Stop();
#endif
SDL2.SDL_Quit();
}
void Init()
{
//open SDL2
SDL2.Load();
//initialise SDL2
if (SDL2.SDL_Init(SDL2.SDL_INIT_VIDEO) != 0)
{
SDL2.SDL_ShowSimpleMessageBox(
SDL2.SDL_MESSAGEBOX_ERROR,
"Error",
"SDL_Init failed, exiting.",
IntPtr.Zero
);
return;
}
//context attributes
SDL2.SDL_GL_SetAttribute(SDL2.SDL_GLattr.SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL2.SDL_GL_SetAttribute(SDL2.SDL_GLattr.SDL_GL_CONTEXT_MINOR_VERSION, 2);
SDL2.SDL_GL_SetAttribute(SDL2.SDL_GLattr.SDL_GL_CONTEXT_PROFILE_MASK,
(int)SDL2.SDL_GLprofile.SDL_GL_CONTEXT_PROFILE_CORE);
//create window
fullscreen = GraphicsSettings.Fullscreen;
var flags = GraphicsSettings.Fullscreen ?
SDL2.SDL_WindowFlags.SDL_WINDOW_FULLSCREEN_DESKTOP | SDL2.SDL_WindowFlags.SDL_WINDOW_OPENGL :
SDL2.SDL_WindowFlags.SDL_WINDOW_OPENGL;
var sdlWin = SDL2.SDL_CreateWindow(
Window.Title,
SDL2.SDL_WINDOWPOS_CENTERED,
SDL2.SDL_WINDOWPOS_CENTERED,
GraphicsSettings.RequestedWidth,
GraphicsSettings.RequestedHeight,
flags
);
Window.Width = GraphicsSettings.RequestedWidth;
Window.Height = GraphicsSettings.RequestedHeight;
Mouse = new Mouse();
Keyboard = new Keyboard();
if (sdlWin == IntPtr.Zero)
{
SDL2.SDL_ShowSimpleMessageBox(
SDL2.SDL_MESSAGEBOX_ERROR,
"Error",
"SDL_CreateWindow failed, exiting.",
IntPtr.Zero
);
return;
}
Window.Handle = sdlWin;
//create gl context
var glcontext = SDL2.SDL_GL_CreateContext(sdlWin);
if (glcontext == IntPtr.Zero)
{
SDL2.SDL_ShowSimpleMessageBox(
SDL2.SDL_MESSAGEBOX_ERROR,
"Error",
"Failed to get GL context, exiting.",
IntPtr.Zero
);
SDL2.SDL_Quit();
return;
}
//Load libraries
GL.Load();
FT.Load();
//Base gl state
GL.glEnable(GL.GL_BLEND);
GL.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
}
