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Annotation of uae/src/sdl-joystick.c, revision 1.1.1.1

1.1       root        1:  /* 
                      2:   * UAE - The Un*x Amiga Emulator
                      3:   * 
                      4:   * Joystick emulation for Linux and BSD. They share too much code to
                      5:   * split this file.
                      6:   * 
                      7:   * Copyright 1997 Bernd Schmidt
                      8:   * Copyright 1998 Krister Walfridsson
                      9:   */
                     10: 
                     11: #include "sysconfig.h"
                     12: #include "sysdeps.h"
                     13: 
                     14: #include "config.h"
                     15: #include "options.h"
                     16: #include "memory.h"
                     17: #include "custom.h"
                     18: #include "joystick.h"
                     19: #include "SDL.h"
                     20: 
                     21: int nr_joysticks;
                     22: 
                     23: static SDL_Joystick *joy0, *joy1;
                     24: 
                     25: struct joy_range
                     26: {
                     27:     int minx, maxx, miny, maxy;
                     28: } range0, range1;
                     29: 
                     30: void read_joystick(int nr, unsigned int *dir, int *button)
                     31: {
                     32:     int x_axis, y_axis;
                     33:     int left = 0, right = 0, top = 0, bot = 0;
                     34:     int len, i, num;
                     35:     SDL_Joystick *joy = nr == 0 ? joy0 : joy1;
                     36:     struct joy_range *r = nr == 0 ? &range0 : &range1;
                     37: 
                     38:     *dir = 0;
                     39:     *button = 0;
                     40:     if (nr >= nr_joysticks)
                     41:        return;
                     42: 
                     43:     SDL_JoystickUpdate ();
                     44: 
                     45:     x_axis = SDL_JoystickGetAxis (joy, 0);
                     46:     y_axis = SDL_JoystickGetAxis (joy, 1);
                     47: 
                     48:     if (x_axis < r->minx) r->minx = x_axis;
                     49:     if (y_axis < r->miny) r->miny = y_axis;
                     50:     if (x_axis > r->maxx) r->maxx = x_axis;
                     51:     if (y_axis > r->maxy) r->maxy = y_axis;
                     52:     
                     53:     if (x_axis < (r->minx + (r->maxx - r->minx)/3))
                     54:        left = 1;
                     55:     else if (x_axis > (r->minx + 2*(r->maxx - r->minx)/3))
                     56:        right = 1;
                     57: 
                     58:     if (y_axis < (r->miny + (r->maxy - r->miny)/3))
                     59:        top = 1;
                     60:     else if (y_axis > (r->miny + 2*(r->maxy - r->miny)/3))
                     61:        bot = 1;
                     62: 
                     63:     if (left) top = !top;
                     64:     if (right) bot = !bot;
                     65:     *dir = bot | (right << 1) | (top << 8) | (left << 9);
                     66:     num = SDL_JoystickNumButtons (joy);
                     67:     if (num > 16)
                     68:        num = 16;
                     69:     for (i = 0; i < num; i++)
                     70:        *button |= (SDL_JoystickGetButton (joy, i) & 1) << i;
                     71: }
                     72: 
                     73: void init_joystick(void)
                     74: {
                     75:     int i;
                     76:     nr_joysticks = SDL_NumJoysticks ();
                     77:     if (nr_joysticks > 0)
                     78:        joy0 = SDL_JoystickOpen (0);
                     79:     if (nr_joysticks > 1)
                     80:        joy1 = SDL_JoystickOpen (1);
                     81:     range0.minx = INT_MAX;
                     82:     range0.maxx = INT_MIN;
                     83:     range0.miny = INT_MAX;
                     84:     range0.maxy = INT_MIN;
                     85:     range1.minx = INT_MAX;
                     86:     range1.maxx = INT_MIN;
                     87:     range1.miny = INT_MAX;
                     88:     range1.maxy = INT_MIN;
                     89: }
                     90: 
                     91: void close_joystick(void)
                     92: {
                     93:     if (nr_joysticks > 0)
                     94:        SDL_JoystickClose (joy0);
                     95:     if (nr_joysticks > 1)
                     96:        SDL_JoystickClose (joy1);
                     97: }

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