private void SdlRunLoop()
{
Sdl.Event ev;
while (Sdl.PollEvent(out ev) == 1)
{
switch (ev.Type)
{
case Sdl.EventType.Quit:
_isExiting++;
break;
case Sdl.EventType.JoyDeviceAdded:
Joystick.AddDevice(ev.JoystickDevice.Which);
break;
case Sdl.EventType.JoyDeviceRemoved:
Joystick.RemoveDevice(ev.JoystickDevice.Which);
break;
case Sdl.EventType.ControllerDeviceRemoved:
GamePad.RemoveDevice(ev.ControllerDevice.Which);
break;
case Sdl.EventType.ControllerButtonUp:
case Sdl.EventType.ControllerButtonDown:
case Sdl.EventType.ControllerAxisMotion:
GamePad.UpdatePacketInfo(ev.ControllerDevice.Which, ev.ControllerDevice.TimeStamp);
break;
case Sdl.EventType.MouseWheel:
const int wheelDelta = 120;
Mouse.ScrollY += ev.Wheel.Y * wheelDelta;
Mouse.ScrollX += ev.Wheel.X * wheelDelta;
break;
case Sdl.EventType.MouseMotion:
Window.MouseState.X = ev.Motion.X;
Window.MouseState.Y = ev.Motion.Y;
break;
case Sdl.EventType.KeyDown:
{
var key = KeyboardUtil.ToXna(ev.Key.Keysym.Sym);
if (!_keys.Contains(key))
{
_keys.Add(key);
}
char character = (char)ev.Key.Keysym.Sym;
_view.OnKeyDown(new InputKeyEventArgs(key));
if (char.IsControl(character))
{
_view.OnTextInput(new TextInputEventArgs(character, key));
}
break;
}
case Sdl.EventType.KeyUp:
{
var key = KeyboardUtil.ToXna(ev.Key.Keysym.Sym);
_keys.Remove(key);
_view.OnKeyUp(new InputKeyEventArgs(key));
break;
}
case Sdl.EventType.TextInput:
if (_view.IsTextInputHandled)
{
int len = 0;
int utf8character = 0; // using an int to encode multibyte characters longer than 2 bytes
byte currentByte = 0;
int charByteSize = 0; // UTF8 char lenght to decode
int remainingShift = 0;
unsafe
{
while ((currentByte = Marshal.ReadByte((IntPtr)ev.Text.Text, len)) != 0)
{
// we're reading the first UTF8 byte, we need to check if it's multibyte
if (charByteSize == 0)
{
if (currentByte < 192)
{
charByteSize = 1;
}
else if (currentByte < 224)
{
charByteSize = 2;
}
else if (currentByte < 240)
{
charByteSize = 3;
}
else
{
charByteSize = 4;
}
utf8character = 0;
remainingShift = 4;
}
// assembling the character
utf8character <<= 8;
utf8character |= currentByte;
charByteSize--;
remainingShift--;
if (charByteSize == 0) // finished decoding the current character
{
utf8character <<= remainingShift * 8; // shifting it to full UTF8 scope
// SDL returns UTF8-encoded characters while C# char type is UTF16-encoded (and limited to the 0-FFFF range / does not support surrogate pairs)
// so we need to convert it to Unicode codepoint and check if it's within the supported range
int codepoint = UTF8ToUnicode(utf8character);
if (codepoint >= 0 && codepoint < 0xFFFF)
{
_view.OnTextInput(new TextInputEventArgs((char)codepoint, KeyboardUtil.ToXna(codepoint)));
// UTF16 characters beyond 0xFFFF are not supported (and would require a surrogate encoding that is not supported by the char type)
}
}
len++;
}
}
}
break;
case Sdl.EventType.WindowEvent:
switch (ev.Window.EventID)
{
case Sdl.Window.EventId.Resized:
case Sdl.Window.EventId.SizeChanged:
_view.ClientResize(ev.Window.Data1, ev.Window.Data2);
break;
case Sdl.Window.EventId.FocusGained:
IsActive = true;
break;
case Sdl.Window.EventId.FocusLost:
IsActive = false;
break;
case Sdl.Window.EventId.Moved:
_view.Moved();
break;
case Sdl.Window.EventId.Close:
_isExiting++;
break;
}
break;
}
}
}
private void SdlRunLoop()
{
Sdl.Event ev;
while (Sdl.PollEvent(out ev) == 1)
{
if (ev.Type == Sdl.EventType.Quit)
{
_isExiting++;
}
else if (ev.Type == Sdl.EventType.JoyDeviceAdded)
{
Joystick.AddDevice(ev.JoystickDevice.Which);
}
else if (ev.Type == Sdl.EventType.ControllerDeviceRemoved)
{
GamePad.RemoveDevice(ev.ControllerDevice.Which);
}
else if (ev.Type == Sdl.EventType.JoyDeviceRemoved)
{
Joystick.RemoveDevice(ev.JoystickDevice.Which);
}
else if (ev.Type == Sdl.EventType.MouseWheel)
{
const int wheelDelta = 120;
Mouse.ScrollY += ev.Wheel.Y * wheelDelta;
Mouse.ScrollX += ev.Wheel.X * wheelDelta;
}
else if (ev.Type == Sdl.EventType.MouseMotion)
{
Window.MouseState.X = ev.Motion.X;
Window.MouseState.Y = ev.Motion.Y;
}
else if (ev.Type == Sdl.EventType.KeyDown)
{
var key = KeyboardUtil.ToXna(ev.Key.Keysym.Sym);
if (!_keys.Contains(key))
{
_keys.Add(key);
}
char character = (char)ev.Key.Keysym.Sym;
if (char.IsControl(character))
{
_view.CallTextInput(character, key);
}
}
else if (ev.Type == Sdl.EventType.KeyUp)
{
var key = KeyboardUtil.ToXna(ev.Key.Keysym.Sym);
_keys.Remove(key);
}
else if (ev.Type == Sdl.EventType.TextInput)
{
int len = 0;
string text = String.Empty;
unsafe
{
while (Marshal.ReadByte((IntPtr)ev.Text.Text, len) != 0)
{
len++;
}
var buffer = new byte[len];
Marshal.Copy((IntPtr)ev.Text.Text, buffer, 0, len);
text = System.Text.Encoding.UTF8.GetString(buffer);
}
if (text.Length == 0)
{
continue;
}
foreach (var c in text)
{
var key = KeyboardUtil.ToXna((int)c);
_view.CallTextInput(c, key);
}
}
else if (ev.Type == Sdl.EventType.DropFile)
{
_view.CallFileDrop(Sdl.GetString(ev.Drop.File));
}
else if (ev.Type == Sdl.EventType.WindowEvent)
{
if (ev.Window.WindowID == _view.Id)
{
if (ev.Window.EventID == Sdl.Window.EventId.Resized || ev.Window.EventID == Sdl.Window.EventId.SizeChanged)
{
_view.ClientResize(ev.Window.Data1, ev.Window.Data2);
}
else if (ev.Window.EventID == Sdl.Window.EventId.FocusGained)
{
IsActive = true;
}
else if (ev.Window.EventID == Sdl.Window.EventId.FocusLost)
{
IsActive = false;
}
else if (ev.Window.EventID == Sdl.Window.EventId.Moved)
{
_view.Moved();
}
else if (ev.Window.EventID == Sdl.Window.EventId.Close)
{
_isExiting++;
}
}
}
}
}
private void PollSDLEvents()
{
Span <char> textEditingBuffer = stackalloc char[SDL.Keyboard.TextEditingEvent.TextSize];
while (SDL.PollEvent(out SDL.Event ev) == 1)
{
switch (ev.Type)
{
case SDL.EventType.Quit:
Interlocked.Increment(ref _isExiting);
break;
#region Joystick
case SDL.EventType.JoyDeviceAdded:
Joystick.AddDevice(ev.JoystickDevice.Which);
break;
case SDL.EventType.JoyDeviceRemoved:
Joystick.RemoveDevice(ev.JoystickDevice.Which);
break;
#endregion
#region GameController
case SDL.EventType.ControllerDeviceRemoved:
GamePad.RemoveDevice(ev.ControllerDevice.Which);
break;
case SDL.EventType.ControllerButtonUp:
case SDL.EventType.ControllerButtonDown:
case SDL.EventType.ControllerAxisMotion:
GamePad.UpdatePacketInfo(ev.ControllerDevice.Which, ev.ControllerDevice.TimeStamp);
break;
#endregion
#region Mouse
case SDL.EventType.MouseWheel:
_window.Mouse.ScrollX += ev.MouseWheel.X * MouseWheelDelta;
_window.Mouse.ScrollY += ev.MouseWheel.Y * MouseWheelDelta;
break;
case SDL.EventType.MouseMotion:
_window.Mouse.State.X = ev.MouseMotion.X;
_window.Mouse.State.Y = ev.MouseMotion.Y;
break;
#endregion
#region Keyboard
case SDL.EventType.KeyDown:
{
bool hasMapping = KeyboardUtil.ToXna(ev.KeyboardKey.Keysym.Sym, out var key);
if (hasMapping)
{
if (!Keyboard._keysDown.Contains(key))
{
Keyboard._keysDown.Add(key);
}
}
// TODO: validate rune?
Rune.TryCreate(ev.KeyboardKey.Keysym.Sym, out var rune);
var inputEv = new TextInputEventArgs(rune, hasMapping ? key : (Keys?)null);
_window.OnKeyDown(inputEv);
break;
}
case SDL.EventType.KeyUp:
{
bool hasMapping = KeyboardUtil.ToXna(ev.KeyboardKey.Keysym.Sym, out var key);
if (hasMapping)
{
Keyboard._keysDown.Remove(key);
}
// TODO: validate rune?
Rune.TryCreate(ev.KeyboardKey.Keysym.Sym, out var rune);
_window.OnKeyUp(new TextInputEventArgs(rune, hasMapping ? key : (Keys?)null));
break;
}
#endregion
#region Text-Input/Editing
case SDL.EventType.TextInput:
unsafe
{
var utf8 = new Span <byte>(ev.TextInput.Text, SDL.Keyboard.TextInputEvent.TextSize);
utf8 = SliceToNullTerminator(utf8);
while (!utf8.IsEmpty)
{
var status = Rune.DecodeFromUtf8(utf8, out Rune rune, out int bytesConsumed);
if (status != OperationStatus.Done)
{
// This should never occur if SDL gives use valid data.
throw new InvalidDataException("Failed to decode UTF-8 text input: " + status);
}
utf8 = utf8[bytesConsumed..];
