src/video/ataricommon/SDL_ataridevmouse.c

   1 /*
   2     SDL - Simple DirectMedia Layer
   3     Copyright (C) 1997-2009 Sam Lantinga
   4
   5     This library is free software; you can redistribute it and/or
   6     modify it under the terms of the GNU Lesser General Public
   7     License as published by the Free Software Foundation; either
   8     version 2.1 of the License, or (at your option) any later version.
   9
  10     This library is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13     Lesser General Public License for more details.
  14
  15     You should have received a copy of the GNU Lesser General Public
  16     License along with this library; if not, write to the Free Software
  17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18
  19     Sam Lantinga
  20     slouken@libsdl.org
  21 */
  22 #include "SDL_config.h"
  23
  24 /*
  25         MiNT /dev/mouse driver
  26
  27         Patrice Mandin
  28 */
  29
  30 #include <fcntl.h>
  31 #include <unistd.h>
  32
  33 #include "../../events/SDL_events_c.h"
  34 #include "SDL_ataridevmouse_c.h"
  35
  36 /* Defines */
  37
  38 #define DEVICE_NAME     "/dev/mouse"
  39
  40 /* Local variables */
  41
  42 static int handle = -1;
  43 static int mouseb, prev_mouseb;
  44
  45 /* Functions */
  46
  47 int SDL_AtariDevMouse_Open(void)
  48 {
  49         int r;
  50         const char *mousedev;
  51
  52         /*
  53                 TODO: Fix the MiNT device driver, that locks mouse for other
  54                 applications, so this is disabled till fixed
  55          */
  56         return 0;
  57
  58         /* First, try SDL_MOUSEDEV device */
  59         mousedev = SDL_getenv("SDL_MOUSEDEV");
  60         if (!mousedev) {
  61                 handle = open(mousedev, 0);
  62         }
  63
  64         /* Failed, try default device */
  65         if (handle<0) {
  66                 handle = open(DEVICE_NAME, 0);
  67         }
  68
  69         if (handle<0) {
  70                 handle = -1;
  71                 return 0;
  72         }
  73
  74         /* Set non blocking mode */
  75         r = fcntl(handle, F_GETFL, 0);
  76         if (r<0) {
  77                 close(handle);
  78                 handle = -1;
  79                 return 0;
  80         }
  81
  82         r |= O_NDELAY;
  83
  84         r = fcntl(handle, F_SETFL, r);
  85         if (r<0) {
  86                 close(handle);
  87                 handle = -1;
  88                 return 0;
  89         }
  90
  91         prev_mouseb = 7;
  92         return 1;
  93 }
  94
  95 void SDL_AtariDevMouse_Close(void)
  96 {
  97         if (handle>0) {
  98                 close(handle);
  99                 handle = -1;
 100         }
 101 }
 102
 103 static int atari_GetButton(int button)
 104 {
 105         switch(button)
 106         {
 107                 case 0:
 108                         return SDL_BUTTON_RIGHT;
 109                 case 1:
 110                         return SDL_BUTTON_MIDDLE;
 111                 default:
 112                         break;
 113         }
 114
 115         return SDL_BUTTON_LEFT;
 116 }
 117
 118 void SDL_AtariDevMouse_PostMouseEvents(_THIS, SDL_bool buttonEvents)
 119 {
 120         unsigned char buffer[3];
 121         int mousex, mousey;
 122
 123         if (handle<0) {
 124                 return;
 125         }
 126
 127         mousex = mousey = 0;
 128         while (read(handle, buffer, sizeof(buffer))==sizeof(buffer)) {
 129                 mouseb = buffer[0] & 7;
 130                 mousex += (char) buffer[1];
 131                 mousey += (char) buffer[2];
 132
 133                 /* Mouse button events */
 134                 if (buttonEvents && (mouseb != prev_mouseb)) {
 135                         int i;
 136
 137                         for (i=0;i<3;i++) {
 138                                 int curbutton, prevbutton;
 139
 140                                 curbutton = mouseb & (1<<i);
 141                                 prevbutton = prev_mouseb & (1<<i);
 142
 143                                 if (curbutton && !prevbutton) {
 144                                         SDL_PrivateMouseButton(SDL_RELEASED, atari_GetButton(i), 0, 0);
 145                                 }
 146                                 if (!curbutton && prevbutton) {
 147                                         SDL_PrivateMouseButton(SDL_PRESSED, atari_GetButton(i), 0, 0);
 148                                 }
 149                         }
 150
 151                         prev_mouseb = mouseb;
 152                 }
 153         }
 154
 155         /* Mouse motion event */
 156         if (mousex || mousey) {
 157                 SDL_PrivateMouseMotion(0, 1, mousex, -mousey);
 158         }
 159 }