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using Ryujinx.SDL2.Common;
using System;
using System.Collections.Generic;
using static SDL2.SDL;
namespace Ryujinx.Input.SDL2
{
public class SDL2GamepadDriver : IGamepadDriver
{
private readonly Dictionary<int, string> _gamepadsInstanceIdsMapping;
private readonly List<string> _gamepadsIds;
private readonly object _lock = new object();
public ReadOnlySpan<string> GamepadsIds
{
get
{
lock (_lock)
{
return _gamepadsIds.ToArray();
}
}
}
public string DriverName => "SDL2";
public event Action<string> OnGamepadConnected;
public event Action<string> OnGamepadDisconnected;
public SDL2GamepadDriver()
{
_gamepadsInstanceIdsMapping = new Dictionary<int, string>();
_gamepadsIds = new List<string>();
SDL2Driver.Instance.Initialize();
SDL2Driver.Instance.OnJoyStickConnected += HandleJoyStickConnected;
SDL2Driver.Instance.OnJoystickDisconnected += HandleJoyStickDisconnected;
// Add already connected gamepads
int numJoysticks = SDL_NumJoysticks();
for (int joystickIndex = 0; joystickIndex < numJoysticks; joystickIndex++)
{
HandleJoyStickConnected(joystickIndex, SDL_JoystickGetDeviceInstanceID(joystickIndex));
}
}
private string GenerateGamepadId(int joystickIndex)
{
Guid guid = SDL_JoystickGetDeviceGUID(joystickIndex);
// Add a unique identifier to the start of the GUID in case of duplicates.
if (guid == Guid.Empty)
{
return null;
}
string id;
lock (_lock)
{
int guidIndex = 0;
id = guidIndex + "-" + guid;
while (_gamepadsIds.Contains(id))
{
id = (++guidIndex) + "-" + guid;
}
}
return id;
}
private int GetJoystickIndexByGamepadId(string id)
{
lock (_lock)
{
return _gamepadsIds.IndexOf(id);
}
}
private void HandleJoyStickDisconnected(int joystickInstanceId)
{
if (_gamepadsInstanceIdsMapping.TryGetValue(joystickInstanceId, out string id))
{
_gamepadsInstanceIdsMapping.Remove(joystickInstanceId);
lock (_lock)
{
_gamepadsIds.Remove(id);
}
OnGamepadDisconnected?.Invoke(id);
}
}
private void HandleJoyStickConnected(int joystickDeviceId, int joystickInstanceId)
{
if (SDL_IsGameController(joystickDeviceId) == SDL_bool.SDL_TRUE)
{
if (_gamepadsInstanceIdsMapping.ContainsKey(joystickInstanceId))
{
// Sometimes a JoyStick connected event fires after the app starts even though it was connected before
// so it is rejected to avoid doubling the entries.
return;
}
string id = GenerateGamepadId(joystickDeviceId);
if (id == null)
{
return;
}
if (_gamepadsInstanceIdsMapping.TryAdd(joystickInstanceId, id))
{
lock (_lock)
{
_gamepadsIds.Add(id);
}
OnGamepadConnected?.Invoke(id);
}
}
}
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
SDL2Driver.Instance.OnJoyStickConnected -= HandleJoyStickConnected;
SDL2Driver.Instance.OnJoystickDisconnected -= HandleJoyStickDisconnected;
// Simulate a full disconnect when disposing
foreach (string id in _gamepadsIds)
{
OnGamepadDisconnected?.Invoke(id);
}
lock (_lock)
{
_gamepadsIds.Clear();
}
SDL2Driver.Instance.Dispose();
}
}
public void Dispose()
{
GC.SuppressFinalize(this);
Dispose(true);
}
public IGamepad GetGamepad(string id)
{
int joystickIndex = GetJoystickIndexByGamepadId(id);
if (joystickIndex == -1)
{
return null;
}
IntPtr gamepadHandle = SDL_GameControllerOpen(joystickIndex);
if (gamepadHandle == IntPtr.Zero)
{
return null;
}
return new SDL2Gamepad(gamepadHandle, id);
}
}
}
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