ref: 70b90f34d93eab3b1c0531a5881ffdbebfc30708
dir: /src/i_joystick.c/
// // Copyright(C) 2005-2014 Simon Howard // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // 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 General Public License for more details. // // DESCRIPTION: // SDL Joystick code. // #include "SDL.h" #include "SDL_joystick.h" #include <stdlib.h> #include <stdio.h> #include <string.h> #include "doomtype.h" #include "d_event.h" #include "i_joystick.h" #include "i_system.h" #include "m_config.h" #include "m_misc.h" // When an axis is within the dead zone, it is set to zero. // This is 5% of the full range: #define DEAD_ZONE (32768 / 3) static SDL_Joystick *joystick = NULL; // Configuration variables: // Standard default.cfg Joystick enable/disable static int usejoystick = 0; // Joystick to use, as an SDL joystick index: static int joystick_index = -1; // Which joystick axis to use for horizontal movement, and whether to // invert the direction: static int joystick_x_axis = 0; static int joystick_x_invert = 0; // Which joystick axis to use for vertical movement, and whether to // invert the direction: static int joystick_y_axis = 1; static int joystick_y_invert = 0; // Which joystick axis to use for strafing? static int joystick_strafe_axis = -1; static int joystick_strafe_invert = 0; // Virtual to physical button joystick button mapping. By default this // is a straight mapping. static int joystick_physical_buttons[NUM_VIRTUAL_BUTTONS] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; void I_ShutdownJoystick(void) { if (joystick != NULL) { SDL_JoystickClose(joystick); joystick = NULL; SDL_QuitSubSystem(SDL_INIT_JOYSTICK); } } static boolean IsValidAxis(int axis) { int num_axes; if (axis < 0) { return true; } if (IS_BUTTON_AXIS(axis)) { return true; } if (IS_HAT_AXIS(axis)) { return HAT_AXIS_HAT(axis) < SDL_JoystickNumHats(joystick); } num_axes = SDL_JoystickNumAxes(joystick); return axis < num_axes; } void I_InitJoystick(void) { if (!usejoystick || joystick_index < 0) { return; } if (SDL_Init(SDL_INIT_JOYSTICK) < 0) { return; } if (joystick_index >= SDL_NumJoysticks()) { printf("I_InitJoystick: Invalid joystick ID: %i\n", joystick_index); SDL_QuitSubSystem(SDL_INIT_JOYSTICK); return; } // Open the joystick joystick = SDL_JoystickOpen(joystick_index); if (joystick == NULL) { printf("I_InitJoystick: Failed to open joystick #%i\n", joystick_index); SDL_QuitSubSystem(SDL_INIT_JOYSTICK); return; } if (!IsValidAxis(joystick_x_axis) || !IsValidAxis(joystick_y_axis) || !IsValidAxis(joystick_strafe_axis)) { printf("I_InitJoystick: Invalid joystick axis for joystick #%i " "(run joystick setup again)\n", joystick_index); SDL_JoystickClose(joystick); joystick = NULL; SDL_QuitSubSystem(SDL_INIT_JOYSTICK); } SDL_JoystickEventState(SDL_ENABLE); // Initialized okay! printf("I_InitJoystick: %s\n", SDL_JoystickName(joystick_index)); I_AtExit(I_ShutdownJoystick, true); } static boolean IsAxisButton(int physbutton) { if (IS_BUTTON_AXIS(joystick_x_axis)) { if (physbutton == BUTTON_AXIS_NEG(joystick_x_axis) || physbutton == BUTTON_AXIS_POS(joystick_x_axis)) { return true; } } if (IS_BUTTON_AXIS(joystick_y_axis)) { if (physbutton == BUTTON_AXIS_NEG(joystick_y_axis) || physbutton == BUTTON_AXIS_POS(joystick_y_axis)) { return true; } } if (IS_BUTTON_AXIS(joystick_strafe_axis)) { if (physbutton == BUTTON_AXIS_NEG(joystick_strafe_axis) || physbutton == BUTTON_AXIS_POS(joystick_strafe_axis)) { return true; } } return false; } // Get the state of the given virtual button. static int ReadButtonState(int vbutton) { int physbutton; // Map from virtual button to physical (SDL) button. if (vbutton < NUM_VIRTUAL_BUTTONS) { physbutton = joystick_physical_buttons[vbutton]; } else { physbutton = vbutton; } // Never read axis buttons as buttons. if (IsAxisButton(physbutton)) { return 0; } return SDL_JoystickGetButton(joystick, physbutton); } // Get a bitmask of all currently-pressed buttons static int GetButtonsState(void) { int i; int result; result = 0; for (i = 0; i < 20; ++i) { if (ReadButtonState(i)) { result |= 1 << i; } } return result; } // Read the state of an axis, inverting if necessary. static int GetAxisState(int axis, int invert) { int result; // Axis -1 means disabled. if (axis < 0) { return 0; } // Is this a button axis, or a hat axis? // If so, we need to handle it specially. result = 0; if (IS_BUTTON_AXIS(axis)) { if (SDL_JoystickGetButton(joystick, BUTTON_AXIS_NEG(axis))) { result -= 32767; } if (SDL_JoystickGetButton(joystick, BUTTON_AXIS_POS(axis))) { result += 32767; } } else if (IS_HAT_AXIS(axis)) { int direction = HAT_AXIS_DIRECTION(axis); int hatval = SDL_JoystickGetHat(joystick, HAT_AXIS_HAT(axis)); if (direction == HAT_AXIS_HORIZONTAL) { if ((hatval & SDL_HAT_LEFT) != 0) { result -= 32767; } else if ((hatval & SDL_HAT_RIGHT) != 0) { result += 32767; } } else if (direction == HAT_AXIS_VERTICAL) { if ((hatval & SDL_HAT_UP) != 0) { result -= 32767; } else if ((hatval & SDL_HAT_DOWN) != 0) { result += 32767; } } } else { result = SDL_JoystickGetAxis(joystick, axis); if (result < DEAD_ZONE && result > -DEAD_ZONE) { result = 0; } } if (invert) { result = -result; } return result; } void I_UpdateJoystick(void) { if (joystick != NULL) { event_t ev; ev.type = ev_joystick; ev.data1 = GetButtonsState(); ev.data2 = GetAxisState(joystick_x_axis, joystick_x_invert); ev.data3 = GetAxisState(joystick_y_axis, joystick_y_invert); ev.data4 = GetAxisState(joystick_strafe_axis, joystick_strafe_invert); D_PostEvent(&ev); } } void I_BindJoystickVariables(void) { int i; M_BindIntVariable("use_joystick", &usejoystick); M_BindIntVariable("joystick_index", &joystick_index); M_BindIntVariable("joystick_x_axis", &joystick_x_axis); M_BindIntVariable("joystick_y_axis", &joystick_y_axis); M_BindIntVariable("joystick_strafe_axis", &joystick_strafe_axis); M_BindIntVariable("joystick_x_invert", &joystick_x_invert); M_BindIntVariable("joystick_y_invert", &joystick_y_invert); M_BindIntVariable("joystick_strafe_invert",&joystick_strafe_invert); for (i = 0; i < NUM_VIRTUAL_BUTTONS; ++i) { char name[32]; M_snprintf(name, sizeof(name), "joystick_physical_button%i", i); M_BindIntVariable(name, &joystick_physical_buttons[i]); } }