ref: 72680b42095864ec2d4affa55e0831e4d8712b6d
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 "doomdef.h" #include "doomtype.h" #include "d_event.h" #include "d_main.h" #include "i_joystick.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 / 20) static SDL_Joystick *joystick = NULL; // Configuration variables: // Standard default.cfg Joystick enable/disable extern int usejoystick; // Joystick to use, as an SDL joystick index: int joystick_index = -1; // Which joystick axis to use for horizontal movement, and whether to // invert the direction: int joystick_x_axis = 0; int joystick_x_invert = 0; // Which joystick axis to use for vertical movement, and whether to // invert the direction: int joystick_y_axis = 1; int joystick_y_invert = 0; void I_InitJoystick(void) { int num_axes; 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; } num_axes = SDL_JoystickNumAxes(joystick); if (joystick_x_axis < 0 || joystick_x_axis >= num_axes || joystick_y_axis < 0 || joystick_y_axis >= num_axes) { 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); // Initialised okay! printf("I_InitJoystick: %s\n", SDL_JoystickName(joystick_index)); } void I_ShutdownJoystick(void) { if (joystick != NULL) { SDL_JoystickClose(joystick); joystick = NULL; SDL_QuitSubSystem(SDL_INIT_JOYSTICK); } } // 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; result = SDL_JoystickGetAxis(joystick, axis); if (invert) { result = -result; } if (result < DEAD_ZONE && result > -DEAD_ZONE) { result = 0; } 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); D_PostEvent(&ev); } }