From 52e7ba5e54380868d2b8d9f97151cd0625ee869e Mon Sep 17 00:00:00 2001
From: Cameron Cawley
Date: Mon, 17 Jun 2019 15:18:13 +0100
Subject: SDL: Support joystick hat input

---
 backends/events/sdl/sdl-events.cpp | 37 ++++++++++++++++++++++++++++++++++++-
 backends/events/sdl/sdl-events.h   |  3 +++
 2 files changed, 39 insertions(+), 1 deletion(-)

(limited to 'backends/events')

diff --git a/backends/events/sdl/sdl-events.cpp b/backends/events/sdl/sdl-events.cpp
index 494e1bf8cd..c3c316e334 100644
--- a/backends/events/sdl/sdl-events.cpp
+++ b/backends/events/sdl/sdl-events.cpp
@@ -101,7 +101,7 @@ void SdlEventSource::loadGameControllerMappingFile() {
 #endif
 
 SdlEventSource::SdlEventSource()
-    : EventSource(), _scrollLock(false), _joystick(0), _lastScreenID(0), _graphicsManager(0), _queuedFakeMouseMove(false)
+    : EventSource(), _scrollLock(false), _joystick(0), _lastScreenID(0), _graphicsManager(0), _queuedFakeMouseMove(false), _lastHatPosition(SDL_HAT_CENTERED)
 #if SDL_VERSION_ATLEAST(2, 0, 0)
       , _queuedFakeKeyUp(false), _fakeKeyUp(), _controller(nullptr)
 #endif
@@ -674,6 +674,8 @@ bool SdlEventSource::dispatchSDLEvent(SDL_Event &ev, Common::Event &event) {
 			return handleJoyButtonUp(ev, event);
 		case SDL_JOYAXISMOTION:
 			return handleJoyAxisMotion(ev, event);
+		case SDL_JOYHATMOTION:
+			return handleJoyHatMotion(ev, event);
 		}
 	}
 
@@ -1042,6 +1044,39 @@ bool SdlEventSource::handleJoyAxisMotion(SDL_Event &ev, Common::Event &event) {
 	return false;
 }
 
+#define HANDLE_HAT_UP(new, old, mask, joybutton) \
+	if ((old & mask) && !(new & mask)) { \
+		event.joystick.button = joybutton; \
+		g_system->getEventManager()->pushEvent(event); \
+	}
+
+#define HANDLE_HAT_DOWN(new, old, mask, joybutton) \
+	if ((new & mask) && !(old & mask)) { \
+		event.joystick.button = joybutton; \
+		g_system->getEventManager()->pushEvent(event); \
+	}
+
+bool SdlEventSource::handleJoyHatMotion(SDL_Event &ev, Common::Event &event) {
+	if (shouldGenerateMouseEvents())
+		return false;
+
+	event.type = Common::EVENT_JOYBUTTON_UP;
+	HANDLE_HAT_UP(ev.jhat.value, _lastHatPosition, SDL_HAT_UP, Common::JOYSTICK_BUTTON_DPAD_UP)
+	HANDLE_HAT_UP(ev.jhat.value, _lastHatPosition, SDL_HAT_DOWN, Common::JOYSTICK_BUTTON_DPAD_DOWN)
+	HANDLE_HAT_UP(ev.jhat.value, _lastHatPosition, SDL_HAT_LEFT, Common::JOYSTICK_BUTTON_DPAD_LEFT)
+	HANDLE_HAT_UP(ev.jhat.value, _lastHatPosition, SDL_HAT_RIGHT, Common::JOYSTICK_BUTTON_DPAD_RIGHT)
+
+	event.type = Common::EVENT_JOYBUTTON_DOWN;
+	HANDLE_HAT_DOWN(ev.jhat.value, _lastHatPosition, SDL_HAT_UP, Common::JOYSTICK_BUTTON_DPAD_UP)
+	HANDLE_HAT_DOWN(ev.jhat.value, _lastHatPosition, SDL_HAT_DOWN, Common::JOYSTICK_BUTTON_DPAD_DOWN)
+	HANDLE_HAT_DOWN(ev.jhat.value, _lastHatPosition, SDL_HAT_LEFT, Common::JOYSTICK_BUTTON_DPAD_LEFT)
+	HANDLE_HAT_DOWN(ev.jhat.value, _lastHatPosition, SDL_HAT_RIGHT, Common::JOYSTICK_BUTTON_DPAD_RIGHT)
+
+	_lastHatPosition = ev.jhat.value;
+
+	return false;
+}
+
 #if SDL_VERSION_ATLEAST(2, 0, 0)
 bool SdlEventSource::handleJoystickAdded(const SDL_JoyDeviceEvent &device) {
 	debug(5, "SdlEventSource: Received joystick added event for index '%d'", device.which);
diff --git a/backends/events/sdl/sdl-events.h b/backends/events/sdl/sdl-events.h
index 6050c80297..bf17cc918f 100644
--- a/backends/events/sdl/sdl-events.h
+++ b/backends/events/sdl/sdl-events.h
@@ -143,6 +143,7 @@ protected:
 	virtual bool handleJoyButtonDown(SDL_Event &ev, Common::Event &event);
 	virtual bool handleJoyButtonUp(SDL_Event &ev, Common::Event &event);
 	virtual bool handleJoyAxisMotion(SDL_Event &ev, Common::Event &event);
+	virtual bool handleJoyHatMotion(SDL_Event &ev, Common::Event &event);
 	virtual void updateKbdMouse();
 	virtual bool handleKbdMouse(Common::Event &event);
 
@@ -224,6 +225,8 @@ protected:
 	 */
 	Common::Event _fakeMouseMove;
 
+	uint8 _lastHatPosition;
+
 #if SDL_VERSION_ATLEAST(2, 0, 0)
 	/**
 	 * Whether _fakeKeyUp contains an event we need to send.
-- 
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