ref: 15c0779ec829d8a0d83ecf33ce19e681e34f1b89
dir: /src/i_joystick.c/
// Emacs style mode select -*- C++ -*- //----------------------------------------------------------------------------- // // Copyright(C) 2007 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. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA // 02111-1307, USA. // // 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" // 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; 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) { return; } if (SDL_Init(SDL_INIT_JOYSTICK) < 0) { return; } if (joystick_index < 0 || 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); } // Get a bitmask of all currently-pressed buttons static int GetButtonState(void) { int i; int result; result = 0; for (i=0; i<SDL_JoystickNumButtons(joystick); ++i) { if (SDL_JoystickGetButton(joystick, 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 = GetButtonState(); 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) { M_BindVariable("use_joystick", &usejoystick); M_BindVariable("joystick_index", &joystick_index); M_BindVariable("joystick_x_axis", &joystick_x_axis); M_BindVariable("joystick_y_axis", &joystick_y_axis); M_BindVariable("joystick_strafe_axis", &joystick_strafe_axis); M_BindVariable("joystick_x_invert", &joystick_x_invert); M_BindVariable("joystick_y_invert", &joystick_y_invert); M_BindVariable("joystick_strafe_invert",&joystick_strafe_invert); }