Initial Gamepad support

Adds initial ingame gamepad support to minetest.

Full Formspec support is not implemented yet and
can be added by a later change.

src/client/joystick_controller.h

@@ -0,0 +1,163 @@
+/*
+Minetest
+Copyright (C) 2016 est31, <MTest31@outlook.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef JOYSTICK_HEADER
+#define JOYSTICK_HEADER
+
+#include "irrlichttypes_extrabloated.h"
+#include "keys.h"
+#include <bitset>
+#include <vector>
+
+enum JoystickAxis {
+	JA_SIDEWARD_MOVE,
+	JA_FORWARD_MOVE,
+
+	JA_FRUSTUM_HORIZONTAL,
+	JA_FRUSTUM_VERTICAL,
+
+	// To know the count of enum values
+	JA_COUNT,
+};
+
+struct JoystickAxisLayout {
+	u16 axis_id;
+	// -1 if to invert, 1 if to keep it.
+	int invert;
+};
+
+
+struct JoystickCombination {
+
+	virtual bool isTriggered(const irr::SEvent::SJoystickEvent &ev) const=0;
+
+	GameKeyType key;
+};
+
+struct JoystickButtonCmb : public JoystickCombination {
+
+	JoystickButtonCmb() {}
+	JoystickButtonCmb(GameKeyType key, u32 filter_mask, u32 compare_mask) :
+		filter_mask(filter_mask),
+		compare_mask(compare_mask)
+	{
+		this->key = key;
+	}
+
+	virtual bool isTriggered(const irr::SEvent::SJoystickEvent &ev) const;
+
+	u32 filter_mask;
+	u32 compare_mask;
+};
+
+struct JoystickAxisCmb : public JoystickCombination {
+
+	JoystickAxisCmb() {}
+	JoystickAxisCmb(GameKeyType key, u16 axis_to_compare, int direction, s16 thresh) :
+		axis_to_compare(axis_to_compare),
+		direction(direction),
+		thresh(thresh)
+	{
+		this->key = key;
+	}
+
+	virtual bool isTriggered(const irr::SEvent::SJoystickEvent &ev) const;
+
+	u16 axis_to_compare;
+
+	// if -1, thresh must be smaller than the axis value in order to trigger
+	// if  1, thresh must be bigger  than the axis value in order to trigger
+	int direction;
+	s16 thresh;
+};
+
+struct JoystickLayout {
+	std::vector<JoystickButtonCmb> button_keys;
+	std::vector<JoystickAxisCmb> axis_keys;
+	JoystickAxisLayout axes[JA_COUNT];
+	s16 axes_dead_border;
+};
+
+class JoystickController {
+
+public:
+	JoystickController();
+	bool handleEvent(const irr::SEvent::SJoystickEvent &ev);
+	void clear();
+
+	bool wasKeyDown(GameKeyType b)
+	{
+		bool r = m_past_pressed_keys[b];
+		m_past_pressed_keys[b] = false;
+		return r;
+	}
+	bool getWasKeyDown(GameKeyType b)
+	{
+		return m_past_pressed_keys[b];
+	}
+	void clearWasKeyDown(GameKeyType b)
+	{
+		m_past_pressed_keys[b] = false;
+	}
+
+	bool wasKeyReleased(GameKeyType b)
+	{
+		bool r = m_past_released_keys[b];
+		m_past_released_keys[b] = false;
+		return r;
+	}
+	bool getWasKeyReleased(GameKeyType b)
+	{
+		return m_past_pressed_keys[b];
+	}
+	void clearWasKeyReleased(GameKeyType b)
+	{
+		m_past_pressed_keys[b] = false;
+	}
+
+	bool isKeyDown(GameKeyType b)
+	{
+		return m_pressed_keys[b];
+	}
+
+	s16 getAxis(JoystickAxis axis)
+	{
+		return m_axes_vals[axis];
+	}
+
+	s16 getAxisWithoutDead(JoystickAxis axis);
+
+	f32 doubling_dtime;
+
+private:
+	const JoystickLayout *m_layout;
+
+	s16 m_axes_vals[JA_COUNT];
+
+	std::bitset<KeyType::INTERNAL_ENUM_COUNT> m_pressed_keys;
+
+	f32 m_internal_time;
+
+	f32 m_past_pressed_time[KeyType::INTERNAL_ENUM_COUNT];
+
+	std::bitset<KeyType::INTERNAL_ENUM_COUNT> m_past_pressed_keys;
+	std::bitset<KeyType::INTERNAL_ENUM_COUNT> m_past_released_keys;
+};
+
+#endif