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      1 /*
      2     SDL - Simple DirectMedia Layer
      3     Copyright (C) 1997-2012 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 (at) 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 }
    160