int2 EventPosition(Sdl2PlatformWindow device, int x, int y)
{
// On Windows and Linux (X11) events are given in surface coordinates
// These must be scaled to our effective window coordinates
if (Platform.CurrentPlatform != PlatformType.OSX && device.WindowSize != device.SurfaceSize)
{
return(new int2((int)(x / device.WindowScale), (int)(y / device.WindowScale)));
}
return(new int2(x, y));
}
public Sdl2GraphicsContext(Sdl2PlatformWindow window)
{
this.window = window;
// SDL requires us to create the GL context on the main thread to avoid various platform-specific issues.
// We must then release it from the main thread before we rebind it to the render thread (in InitializeOpenGL below).
context = SDL.SDL_GL_CreateContext(window.Window);
if (context == IntPtr.Zero || SDL.SDL_GL_MakeCurrent(window.Window, IntPtr.Zero) < 0)
{
throw new InvalidOperationException($"Can not create OpenGL context. (Error: {SDL.SDL_GetError()})");
}
}
int2 EventPosition(Sdl2PlatformWindow device, int x, int y)
{
// On Windows and Linux (X11) events are given in surface coordinates
// These must be scaled to our effective window coordinates
// Round fractional components up to avoid rounding small deltas to 0
if (Platform.CurrentPlatform != PlatformType.OSX && device.EffectiveWindowSize != device.SurfaceSize)
{
var s = 1 / device.EffectiveWindowScale;
return(new int2((int)(Math.Sign(x) / 2f + x * s), (int)(Math.Sign(x) / 2f + y * s)));
}
// On macOS we must still account for the user-requested scale modifier
if (Platform.CurrentPlatform == PlatformType.OSX && device.EffectiveWindowScale != device.NativeWindowScale)
{
var s = device.NativeWindowScale / device.EffectiveWindowScale;
return(new int2((int)(Math.Sign(x) / 2f + x * s), (int)(Math.Sign(x) / 2f + y * s)));
}
return(new int2(x, y));
}
public Sdl2GraphicsContext(Sdl2PlatformWindow window)
{
this.window = window;
}
public void PumpInput(Sdl2PlatformWindow device, IInputHandler inputHandler)
{
var mods = MakeModifiers((int)SDL.SDL_GetModState());
var scrollDelta = 0;
inputHandler.ModifierKeys(mods);
MouseInput?pendingMotion = null;
SDL.SDL_Event e;
while (SDL.SDL_PollEvent(out e) != 0)
{
switch (e.type)
{
case SDL.SDL_EventType.SDL_QUIT:
Game.Exit();
break;
case SDL.SDL_EventType.SDL_WINDOWEVENT:
{
switch (e.window.windowEvent)
{
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_FOCUS_LOST:
Game.HasInputFocus = false;
break;
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_FOCUS_GAINED:
Game.HasInputFocus = true;
break;
// Triggered when moving between displays with different DPI settings
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_SIZE_CHANGED:
device.WindowSizeChanged();
break;
}
break;
}
case SDL.SDL_EventType.SDL_MOUSEBUTTONDOWN:
{
if (pendingMotion != null)
{
inputHandler.OnMouseInput(pendingMotion.Value);
pendingMotion = null;
}
var button = MakeButton(e.button.button);
lastButtonBits |= button;
var pos = EventPosition(device, e.button.x, e.button.y);
inputHandler.OnMouseInput(new MouseInput(
MouseInputEvent.Down, button, scrollDelta, pos, mods,
MultiTapDetection.DetectFromMouse(e.button.button, pos)));
break;
}
case SDL.SDL_EventType.SDL_MOUSEBUTTONUP:
{
if (pendingMotion != null)
{
inputHandler.OnMouseInput(pendingMotion.Value);
pendingMotion = null;
}
var button = MakeButton(e.button.button);
lastButtonBits &= ~button;
var pos = EventPosition(device, e.button.x, e.button.y);
inputHandler.OnMouseInput(new MouseInput(
MouseInputEvent.Up, button, scrollDelta, pos, mods,
MultiTapDetection.InfoFromMouse(e.button.button)));
break;
}
case SDL.SDL_EventType.SDL_MOUSEMOTION:
{
var pos = EventPosition(device, e.motion.x, e.motion.y);
pendingMotion = new MouseInput(
MouseInputEvent.Move, lastButtonBits, scrollDelta,
pos, mods, 0);
break;
}
case SDL.SDL_EventType.SDL_MOUSEWHEEL:
{
int x, y;
SDL.SDL_GetMouseState(out x, out y);
scrollDelta = e.wheel.y;
inputHandler.OnMouseInput(new MouseInput(MouseInputEvent.Scroll, MouseButton.None, scrollDelta, new int2(x, y), mods, 0));
break;
}
case SDL.SDL_EventType.SDL_TEXTINPUT:
{
var rawBytes = new byte[SDL.SDL_TEXTINPUTEVENT_TEXT_SIZE];
unsafe { Marshal.Copy((IntPtr)e.text.text, rawBytes, 0, SDL.SDL_TEXTINPUTEVENT_TEXT_SIZE); }
inputHandler.OnTextInput(Encoding.UTF8.GetString(rawBytes, 0, Array.IndexOf(rawBytes, (byte)0)));
break;
}
case SDL.SDL_EventType.SDL_KEYDOWN:
case SDL.SDL_EventType.SDL_KEYUP:
{
var keyCode = (Keycode)e.key.keysym.sym;
var type = e.type == SDL.SDL_EventType.SDL_KEYDOWN ?
KeyInputEvent.Down : KeyInputEvent.Up;
var tapCount = e.type == SDL.SDL_EventType.SDL_KEYDOWN ?
MultiTapDetection.DetectFromKeyboard(keyCode) :
MultiTapDetection.InfoFromKeyboard(keyCode);
var keyEvent = new KeyInput
{
Event = type,
Key = keyCode,
Modifiers = mods,
UnicodeChar = (char)e.key.keysym.sym,
MultiTapCount = tapCount,
IsRepeat = e.key.repeat != 0
};
// Special case workaround for windows users
if (e.key.keysym.sym == SDL.SDL_Keycode.SDLK_F4 && mods.HasModifier(Modifiers.Alt) &&
Platform.CurrentPlatform == PlatformType.Windows)
{
Game.Exit();
}
else
{
inputHandler.OnKeyInput(keyEvent);
}
break;
}
}
}
if (pendingMotion != null)
{
inputHandler.OnMouseInput(pendingMotion.Value);
pendingMotion = null;
}
}
public void PumpInput(Sdl2PlatformWindow device, IInputHandler inputHandler, int2?lockedMousePosition)
{
var mods = MakeModifiers((int)SDL.SDL_GetModState());
inputHandler.ModifierKeys(mods);
MouseInput?pendingMotion = null;
while (SDL.SDL_PollEvent(out var e) != 0)
{
switch (e.type)
{
case SDL.SDL_EventType.SDL_QUIT:
// On macOS, we'd like to restrict Cmd + Q from suddenly exiting the game.
if (Platform.CurrentPlatform != PlatformType.OSX || !mods.HasModifier(Modifiers.Meta))
{
Game.Exit();
}
break;
case SDL.SDL_EventType.SDL_WINDOWEVENT:
{
switch (e.window.windowEvent)
{
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_FOCUS_LOST:
device.HasInputFocus = false;
break;
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_FOCUS_GAINED:
device.HasInputFocus = true;
break;
// Triggered when moving between displays with different DPI settings
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_SIZE_CHANGED:
device.WindowSizeChanged();
break;
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_HIDDEN:
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_MINIMIZED:
device.IsSuspended = true;
break;
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_EXPOSED:
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_SHOWN:
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_MAXIMIZED:
case SDL.SDL_WindowEventID.SDL_WINDOWEVENT_RESTORED:
device.IsSuspended = false;
break;
}
break;
}
case SDL.SDL_EventType.SDL_MOUSEBUTTONDOWN:
{
if (pendingMotion != null)
{
inputHandler.OnMouseInput(pendingMotion.Value);
pendingMotion = null;
}
var button = MakeButton(e.button.button);
lastButtonBits |= button;
var input = lockedMousePosition ?? new int2(e.button.x, e.button.y);
var pos = EventPosition(device, input.X, input.Y);
inputHandler.OnMouseInput(new MouseInput(
MouseInputEvent.Down, button, pos, int2.Zero, mods,
MultiTapDetection.DetectFromMouse(e.button.button, pos)));
break;
}
case SDL.SDL_EventType.SDL_MOUSEBUTTONUP:
{
if (pendingMotion != null)
{
inputHandler.OnMouseInput(pendingMotion.Value);
pendingMotion = null;
}
var button = MakeButton(e.button.button);
lastButtonBits &= ~button;
var input = lockedMousePosition ?? new int2(e.button.x, e.button.y);
var pos = EventPosition(device, input.X, input.Y);
inputHandler.OnMouseInput(new MouseInput(
MouseInputEvent.Up, button, pos, int2.Zero, mods,
MultiTapDetection.InfoFromMouse(e.button.button)));
break;
}
case SDL.SDL_EventType.SDL_MOUSEMOTION:
{
var mousePos = new int2(e.motion.x, e.motion.y);
var input = lockedMousePosition ?? mousePos;
var pos = EventPosition(device, input.X, input.Y);
var delta = lockedMousePosition == null
? EventPosition(device, e.motion.xrel, e.motion.yrel)
: mousePos - lockedMousePosition.Value;
pendingMotion = new MouseInput(
MouseInputEvent.Move, lastButtonBits, pos, delta, mods, 0);
break;
}
case SDL.SDL_EventType.SDL_MOUSEWHEEL:
{
SDL.SDL_GetMouseState(out var x, out var y);
var pos = EventPosition(device, x, y);
inputHandler.OnMouseInput(new MouseInput(MouseInputEvent.Scroll, MouseButton.None, pos, new int2(0, e.wheel.y), mods, 0));
break;
}
case SDL.SDL_EventType.SDL_TEXTINPUT:
{
var rawBytes = new byte[SDL.SDL_TEXTINPUTEVENT_TEXT_SIZE];
unsafe { Marshal.Copy((IntPtr)e.text.text, rawBytes, 0, SDL.SDL_TEXTINPUTEVENT_TEXT_SIZE); }
inputHandler.OnTextInput(Encoding.UTF8.GetString(rawBytes, 0, Array.IndexOf(rawBytes, (byte)0)));
break;
}
case SDL.SDL_EventType.SDL_KEYDOWN:
case SDL.SDL_EventType.SDL_KEYUP:
{
var keyCode = (Keycode)e.key.keysym.sym;
var type = e.type == SDL.SDL_EventType.SDL_KEYDOWN ?
KeyInputEvent.Down : KeyInputEvent.Up;
var tapCount = e.type == SDL.SDL_EventType.SDL_KEYDOWN ?
MultiTapDetection.DetectFromKeyboard(keyCode, mods) :
MultiTapDetection.InfoFromKeyboard(keyCode, mods);
var keyEvent = new KeyInput
{
Event = type,
Key = keyCode,
Modifiers = mods,
UnicodeChar = (char)e.key.keysym.sym,
MultiTapCount = tapCount,
IsRepeat = e.key.repeat != 0
};
// Special case workaround for windows users
if (e.key.keysym.sym == SDL.SDL_Keycode.SDLK_F4 && mods.HasModifier(Modifiers.Alt) &&
Platform.CurrentPlatform == PlatformType.Windows)
{
Game.Exit();
}
else
{
inputHandler.OnKeyInput(keyEvent);
}
break;
}
}
}
if (pendingMotion != null)
{
inputHandler.OnMouseInput(pendingMotion.Value);
pendingMotion = null;
}
}
