hydroSDL: HydroSDL/joystick_SDL.cpp Source File

00001 #include "SDL.h"
00002 #include "joystick_SDL.h"
00003 
00004 
00005 int numJoy; // number of joystick available
00006 int numAxes;
00007 SDL_Joystick* joystick;
00008         
00009         
00010 
00011 int joystick_init()
00012 {
00013         int dummy;
00014         numJoy = SDL_NumJoysticks();
00015         
00016         if (numJoy<0)
00017         {
00018                 joystick = SDL_JoystickOpen(0); //use first joystick, if any
00019                 numAxes = SDL_JoystickNumAxes (joystick);
00020                 fprintf( stderr, "Joystick found, Number of axes: %d \n", numAxes);
00021                 dummy = SDL_JoystickEventState(SDL_QUERY);
00022         }
00023         else
00024         {
00025                 fprintf( stderr, "No Joystick could be opened!! \n");
00026         }
00027         
00028         return 1;
00029 }
00030 
00031 
00032 
00033 void joystick_getXYZR(float *X, float *Y, float *Z, float *R, bool doX, bool doY, bool doZ, bool doR)
00034 {
00035         if (SDL_JoystickOpened(0))
00036         {
00037                 if (numAxes>0 && doX) *X = (float(SDL_JoystickGetAxis(joystick, 0))/32768.0f) - 1.0f;
00038                 if (numAxes>1 && doY) *Y = (float(SDL_JoystickGetAxis(joystick, 1))/32768.0f) - 1.0f;
00039                 if (numAxes>2 && doR) *Z = (float(SDL_JoystickGetAxis(joystick, 2))/32768.0f) - 1.0f;
00040                 if (numAxes>3 && doZ) *R = (float(SDL_JoystickGetAxis(joystick, 3))/32768.0f) - 1.0f;
00041         }
00042 }
00043 
00044 
00045 
00046 void joystick_close()
00047 {
00048         if (numJoy<0)
00049         {
00050                 SDL_JoystickClose(joystick); // Close joystick, if any
00051         }
00052 }