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.cpp

@@ -0,0 +1,179 @@
+/*
+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.
+*/
+
+#include "joystick_controller.h"
+#include "irrlichttypes_extrabloated.h"
+#include "keys.h"
+#include "settings.h"
+#include "gettime.h"
+
+bool JoystickButtonCmb::isTriggered(const irr::SEvent::SJoystickEvent &ev) const
+{
+	u32 buttons = ev.ButtonStates;
+
+	buttons &= filter_mask;
+	return buttons == compare_mask;
+}
+
+bool JoystickAxisCmb::isTriggered(const irr::SEvent::SJoystickEvent &ev) const
+{
+	s16 ax_val = ev.Axis[axis_to_compare];
+
+	return (ax_val * direction < 0) && (thresh * direction > ax_val * direction);
+}
+
+// spares many characters
+#define JLO_B_PB(A, B, C)    jlo.button_keys.push_back(JoystickButtonCmb(A, B, C))
+#define JLO_A_PB(A, B, C, D) jlo.axis_keys.push_back(JoystickAxisCmb(A, B, C, D))
+
+static JoystickLayout create_default_layout()
+{
+	JoystickLayout jlo;
+
+	jlo.axes_dead_border = 1024;
+
+	const JoystickAxisLayout axes[JA_COUNT] = {
+		{0, 1}, // JA_SIDEWARD_MOVE
+		{1, 1}, // JA_FORWARD_MOVE
+		{3, 1}, // JA_FRUSTUM_HORIZONTAL
+		{4, 1}, // JA_FRUSTUM_VERTICAL
+	};
+	memcpy(jlo.axes, axes, sizeof(jlo.axes));
+
+	u32 sb = 1 << 7; // START button mask
+	u32 fb = 1 << 3; // FOUR button mask
+	u32 bm = sb | fb; // Mask for Both Modifiers
+
+	// The back button means "ESC".
+	JLO_B_PB(KeyType::ESC,        1 << 6,      1 << 6);
+
+	// The start button counts as modifier as well as use key.
+	// JLO_B_PB(KeyType::USE,        sb,          sb));
+
+	// Accessible without start modifier button pressed
+	// regardless whether four is pressed or not
+	JLO_B_PB(KeyType::SNEAK,      sb | 1 << 2, 1 << 2);
+
+	// Accessible without four modifier button pressed
+	// regardless whether start is pressed or not
+	JLO_B_PB(KeyType::MOUSE_L,    fb | 1 << 4, 1 << 4);
+	JLO_B_PB(KeyType::MOUSE_R,    fb | 1 << 5, 1 << 5);
+
+	// Accessible without any modifier pressed
+	JLO_B_PB(KeyType::JUMP,       bm | 1 << 0, 1 << 0);
+	JLO_B_PB(KeyType::SPECIAL1,   bm | 1 << 1, 1 << 1);
+
+	// Accessible with start button not pressed, but four pressed
+	// TODO find usage for button 0
+	JLO_B_PB(KeyType::DROP,       bm | 1 << 1, fb | 1 << 1);
+	JLO_B_PB(KeyType::SCROLL_UP,  bm | 1 << 4, fb | 1 << 4);
+	JLO_B_PB(KeyType::SCROLL_DOWN,bm | 1 << 5, fb | 1 << 5);
+
+	// Accessible with start button and four pressed
+	// TODO find usage for buttons 0, 1 and 4, 5
+
+	// Now about the buttons simulated by the axes
+
+	// Movement buttons, important for vessels
+	JLO_A_PB(KeyType::FORWARD,  1,  1, 1024);
+	JLO_A_PB(KeyType::BACKWARD, 1, -1, 1024);
+	JLO_A_PB(KeyType::LEFT,     0,  1, 1024);
+	JLO_A_PB(KeyType::RIGHT,    0, -1, 1024);
+
+	// Scroll buttons
+	JLO_A_PB(KeyType::SCROLL_UP,   2, -1, 1024);
+	JLO_A_PB(KeyType::SCROLL_DOWN, 5, -1, 1024);
+
+	return jlo;
+}
+
+static const JoystickLayout default_layout = create_default_layout();
+
+JoystickController::JoystickController()
+{
+	m_layout = &default_layout;
+	doubling_dtime = g_settings->getFloat("repeat_joystick_button_time");
+
+	for (size_t i = 0; i < KeyType::INTERNAL_ENUM_COUNT; i++) {
+		m_past_pressed_time[i] = 0;
+	}
+	clear();
+}
+
+bool JoystickController::handleEvent(const irr::SEvent::SJoystickEvent &ev)
+{
+	m_internal_time = getTimeMs() / 1000.f;
+
+	std::bitset<KeyType::INTERNAL_ENUM_COUNT> keys_pressed;
+
+	// First generate a list of keys pressed
+
+	for (size_t i = 0; i < m_layout->button_keys.size(); i++) {
+		if (m_layout->button_keys[i].isTriggered(ev)) {
+			keys_pressed.set(m_layout->button_keys[i].key);
+		}
+	}
+
+	for (size_t i = 0; i < m_layout->axis_keys.size(); i++) {
+		if (m_layout->axis_keys[i].isTriggered(ev)) {
+			keys_pressed.set(m_layout->axis_keys[i].key);
+		}
+	}
+
+	// Then update the values
+
+	for (size_t i = 0; i < KeyType::INTERNAL_ENUM_COUNT; i++) {
+		if (keys_pressed[i]) {
+			if (!m_past_pressed_keys[i] &&
+					m_past_pressed_time[i] < m_internal_time - doubling_dtime) {
+				m_past_pressed_keys[i] = true;
+				m_past_pressed_time[i] = m_internal_time;
+			}
+		} else if (m_pressed_keys[i]) {
+			m_past_released_keys[i] = true;
+		}
+
+		m_pressed_keys[i] = keys_pressed[i];
+	}
+
+	for (size_t i = 0; i < JA_COUNT; i++) {
+		const JoystickAxisLayout &ax_la = m_layout->axes[i];
+		m_axes_vals[i] = ax_la.invert * ev.Axis[ax_la.axis_id];
+	}
+
+
+	return true;
+}
+
+void JoystickController::clear()
+{
+	m_pressed_keys.reset();
+	m_past_pressed_keys.reset();
+	m_past_released_keys.reset();
+	memset(m_axes_vals, 0, sizeof(m_axes_vals));
+}
+
+s16 JoystickController::getAxisWithoutDead(JoystickAxis axis)
+{
+	s16 v = m_axes_vals[axis];
+	if (((v > 0) && (v < m_layout->axes_dead_border)) ||
+			((v < 0) && (v > -m_layout->axes_dead_border)))
+		return 0;
+	return v;
+}