Port #4141 from citra: Joystick hotplug support (#1275)

* Joystick hotplug support (#4141)

* use SDL_PollEvent instead of SDL_JoystickUpdate

Register hot plugged controller by GUID if they were configured in a previous session

* Move SDL_PollEvent into its own thread

* Don't store SDLJoystick pointer in Input Device; Get pointer on each GetStatus call

* Fix that joystick_list gets cleared after SDL_Quit

* Add VirtualJoystick for InputDevices thats never nullptr

* fixup! Add VirtualJoystick for InputDevices thats never nullptr

* fixup! fixup! Add VirtualJoystick for InputDevices thats never nullptr

* Remove SDL_GameController, make SDL_Joystick* unique_ptr

* fixup! Remove SDL_GameController, make SDL_Joystick* unique_ptr

* Adressed feedback; fixed handling of same guid reconnects

* fixup! Adressed feedback; fixed handling of same guid reconnects

* merge the two joystick_lists into one

* make SDLJoystick a member of VirtualJoystick

* fixup! make SDLJoystick a member of VirtualJoystick

* fixup! make SDLJoystick a member of VirtualJoystick

* fixup! fixup! make SDLJoystick a member of VirtualJoystick

* SDLJoystick: Addressed review comments

* Address one missed review comment

1 files changed, 12 insertions, 0 deletions

diff --git a/src/input_common/main.cpp b/src/input_common/main.cpp
index b12623d55..37f572853 100644
--- a/src/input_common/main.cpp
+++ b/src/input_common/main.cpp
@@ -3,6 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <memory>
+#include <thread>
 #include "common/param_package.h"
 #include "input_common/analog_from_button.h"
 #include "input_common/keyboard.h"
@@ -17,6 +18,10 @@ namespace InputCommon {
 static std::shared_ptr<Keyboard> keyboard;
 static std::shared_ptr<MotionEmu> motion_emu;
 
+#ifdef HAVE_SDL2
+static std::thread poll_thread;
+#endif
+
 void Init() {
     keyboard = std::make_shared<Keyboard>();
     Input::RegisterFactory<Input::ButtonDevice>("keyboard", keyboard);
@@ -30,6 +35,12 @@ void Init() {
 #endif
 }
 
+void StartJoystickEventHandler() {
+#ifdef HAVE_SDL2
+    poll_thread = std::thread(SDL::PollLoop);
+#endif
+}
+
 void Shutdown() {
     Input::UnregisterFactory<Input::ButtonDevice>("keyboard");
     keyboard.reset();
@@ -39,6 +50,7 @@ void Shutdown() {
 
 #ifdef HAVE_SDL2
     SDL::Shutdown();
+    poll_thread.join();
 #endif
 }