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SDL_sysjoystick.c
1236 lines (1075 loc) · 35.5 KB
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2011 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#ifdef SDL_JOYSTICK_LINUX
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/* This is the system specific header for the SDL joystick API */
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
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#include <limits.h> /* For the definition of PATH_MAX */
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#include <linux/joystick.h>
#include "SDL_joystick.h"
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#include "../SDL_sysjoystick.h"
#include "../SDL_joystick_c.h"
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#include "SDL_sysjoystick_c.h"
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/* Special joystick configurations */
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static struct
{
const char *name;
int naxes;
int nhats;
int nballs;
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} special_joysticks[] = {
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{
"MadCatz Panther XL", 3, 2, 1}, /* We don't handle rudder (axis 8) */
{
"SideWinder Precision Pro", 4, 1, 0}, {
"SideWinder 3D Pro", 4, 1, 0}, {
"Microsoft SideWinder 3D Pro", 4, 1, 0}, {
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"Microsoft SideWinder Precision Pro", 4, 1, 0}, {
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"Microsoft SideWinder Dual Strike USB version 1.0", 2, 1, 0}, {
"WingMan Interceptor", 3, 3, 0}, {
"WingMan Extreme Digital 3D", 4, 1, 0}, {
"Microsoft SideWinder Precision 2 Joystick", 4, 1, 0}, {
"Logitech Inc. WingMan Extreme Digital 3D", 4, 1, 0}, {
"Saitek Saitek X45", 6, 1, 0}
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};
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/* It looks like newer kernels have the logical mapping at the driver level */
#define NO_LOGICAL_JOYSTICKS
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#ifndef NO_LOGICAL_JOYSTICKS
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/*
Some USB HIDs show up as a single joystick even though they actually
control 2 or more joysticks.
*/
/*
This code handles the MP-8800 (Quad) and MP-8866 (Dual), which can
be identified by their transparent blue design. It's quite trivial
to add other joysticks with similar quirky behavior.
-id
*/
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struct joystick_logical_mapping
{
int njoy;
int nthing;
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};
/*
{logical joy, logical axis},
{logical joy, logical hat},
{logical joy, logical ball},
{logical joy, logical button}
*/
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static struct joystick_logical_mapping mp88xx_1_logical_axismap[] = {
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{0, 0}, {0, 1}, {0, 2}, {0, 3}, {0, 4}, {0, 5}
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};
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static struct joystick_logical_mapping mp88xx_1_logical_buttonmap[] = {
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{0, 0}, {0, 1}, {0, 2}, {0, 3}, {0, 4}, {0, 5}, {0, 6}, {0, 7}, {0, 8},
{0, 9}, {0, 10}, {0, 11}
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};
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static struct joystick_logical_mapping mp88xx_2_logical_axismap[] = {
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{0, 0}, {0, 1}, {0, 2}, {1, 0}, {1, 1}, {0, 3},
{1, 2}, {1, 3}, {0, 4}, {0, 5}, {1, 4}, {1, 5}
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};
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static struct joystick_logical_mapping mp88xx_2_logical_buttonmap[] = {
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{0, 0}, {0, 1}, {0, 2}, {0, 3}, {0, 4}, {0, 5}, {0, 6}, {0, 7}, {0, 8},
{0, 9}, {0, 10}, {0, 11},
{1, 0}, {1, 1}, {1, 2}, {1, 3}, {1, 4}, {1, 5}, {1, 6}, {1, 7}, {1, 8},
{1, 9}, {1, 10}, {1, 11}
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};
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static struct joystick_logical_mapping mp88xx_3_logical_axismap[] = {
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{0, 0}, {0, 1}, {0, 2}, {1, 0}, {1, 1}, {0, 3},
{1, 2}, {1, 3}, {2, 0}, {2, 1}, {2, 2}, {2, 3},
{0, 4}, {0, 5}, {1, 4}, {1, 5}, {2, 4}, {2, 5}
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};
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static struct joystick_logical_mapping mp88xx_3_logical_buttonmap[] = {
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{0, 0}, {0, 1}, {0, 2}, {0, 3}, {0, 4}, {0, 5}, {0, 6}, {0, 7}, {0, 8},
{0, 9}, {0, 10}, {0, 11},
{1, 0}, {1, 1}, {1, 2}, {1, 3}, {1, 4}, {1, 5}, {1, 6}, {1, 7}, {1, 8},
{1, 9}, {1, 10}, {1, 11},
{2, 0}, {2, 1}, {2, 2}, {2, 3}, {2, 4}, {2, 5}, {2, 6}, {2, 7}, {2, 8},
{2, 9}, {2, 10}, {2, 11}
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};
static struct joystick_logical_mapping mp88xx_4_logical_axismap[] = {
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{0, 0}, {0, 1}, {0, 2}, {1, 0}, {1, 1}, {0, 3},
{1, 2}, {1, 3}, {2, 0}, {2, 1}, {2, 2}, {2, 3},
{3, 0}, {3, 1}, {3, 2}, {3, 3}, {0, 4}, {0, 5},
{1, 4}, {1, 5}, {2, 4}, {2, 5}, {3, 4}, {3, 5}
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};
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static struct joystick_logical_mapping mp88xx_4_logical_buttonmap[] = {
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{0, 0}, {0, 1}, {0, 2}, {0, 3}, {0, 4}, {0, 5}, {0, 6}, {0, 7}, {0, 8},
{0, 9}, {0, 10}, {0, 11},
{1, 0}, {1, 1}, {1, 2}, {1, 3}, {1, 4}, {1, 5}, {1, 6}, {1, 7}, {1, 8},
{1, 9}, {1, 10}, {1, 11},
{2, 0}, {2, 1}, {2, 2}, {2, 3}, {2, 4}, {2, 5}, {2, 6}, {2, 7}, {2, 8},
{2, 9}, {2, 10}, {2, 11},
{3, 0}, {3, 1}, {3, 2}, {3, 3}, {3, 4}, {3, 5}, {3, 6}, {3, 7}, {3, 8},
{3, 9}, {3, 10}, {3, 11}
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};
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struct joystick_logical_layout
{
int naxes;
int nhats;
int nballs;
int nbuttons;
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};
static struct joystick_logical_layout mp88xx_1_logical_layout[] = {
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{6, 0, 0, 12}
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};
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static struct joystick_logical_layout mp88xx_2_logical_layout[] = {
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{6, 0, 0, 12},
{6, 0, 0, 12}
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};
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static struct joystick_logical_layout mp88xx_3_logical_layout[] = {
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{6, 0, 0, 12},
{6, 0, 0, 12},
{6, 0, 0, 12}
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};
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static struct joystick_logical_layout mp88xx_4_logical_layout[] = {
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{6, 0, 0, 12},
{6, 0, 0, 12},
{6, 0, 0, 12},
{6, 0, 0, 12}
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};
/*
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This array sets up a means of mapping a single physical joystick to
multiple logical joysticks. (djm)
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njoys
the number of logical joysticks
layouts
an array of layout structures, one to describe each logical joystick
axes, hats, balls, buttons
arrays that map a physical thingy to a logical thingy
*/
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struct joystick_logicalmap
{
const char *name;
int nbuttons;
int njoys;
struct joystick_logical_layout *layout;
struct joystick_logical_mapping *axismap;
struct joystick_logical_mapping *hatmap;
struct joystick_logical_mapping *ballmap;
struct joystick_logical_mapping *buttonmap;
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};
static struct joystick_logicalmap joystick_logicalmap[] = {
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{
"WiseGroup.,Ltd MP-8866 Dual USB Joypad",
12,
1,
mp88xx_1_logical_layout,
mp88xx_1_logical_axismap,
NULL,
NULL,
mp88xx_1_logical_buttonmap},
{
"WiseGroup.,Ltd MP-8866 Dual USB Joypad",
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2,
mp88xx_2_logical_layout,
mp88xx_2_logical_axismap,
NULL,
NULL,
mp88xx_2_logical_buttonmap},
{
"WiseGroup.,Ltd MP-8800 Quad USB Joypad",
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1,
mp88xx_1_logical_layout,
mp88xx_1_logical_axismap,
NULL,
NULL,
mp88xx_1_logical_buttonmap},
{
"WiseGroup.,Ltd MP-8800 Quad USB Joypad",
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2,
mp88xx_2_logical_layout,
mp88xx_2_logical_axismap,
NULL,
NULL,
mp88xx_2_logical_buttonmap},
{
"WiseGroup.,Ltd MP-8800 Quad USB Joypad",
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3,
mp88xx_3_logical_layout,
mp88xx_3_logical_axismap,
NULL,
NULL,
mp88xx_3_logical_buttonmap},
{
"WiseGroup.,Ltd MP-8800 Quad USB Joypad",
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4,
mp88xx_4_logical_layout,
mp88xx_4_logical_axismap,
NULL,
NULL,
mp88xx_4_logical_buttonmap}
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};
/* find the head of a linked list, given a point in it
*/
#define SDL_joylist_head(i, start)\
for(i = start; SDL_joylist[i].fname == NULL;) i = SDL_joylist[i].prev;
#define SDL_logical_joydecl(d) d
#else
#define SDL_logical_joydecl(d)
#endif /* USE_LOGICAL_JOYSTICKS */
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/* The maximum number of joysticks we'll detect */
#define MAX_JOYSTICKS 32
/* A list of available joysticks */
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static struct
{
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char *fname;
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#ifndef NO_LOGICAL_JOYSTICKS
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SDL_Joystick *joy;
struct joystick_logicalmap *map;
int prev;
int next;
int logicalno;
#endif /* USE_LOGICAL_JOYSTICKS */
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} SDL_joylist[MAX_JOYSTICKS];
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#ifndef NO_LOGICAL_JOYSTICKS
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static int
CountLogicalJoysticks(int max)
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{
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register int i, j, k, ret, prev;
const char *name;
int nbuttons, fd;
unsigned char n;
ret = 0;
for (i = 0; i < max; i++) {
name = SDL_SYS_JoystickName(i);
fd = open(SDL_joylist[i].fname, O_RDONLY, 0);
if (fd >= 0) {
if (ioctl(fd, JSIOCGBUTTONS, &n) < 0) {
nbuttons = -1;
} else {
nbuttons = n;
}
close(fd);
} else {
nbuttons = -1;
}
if (name) {
for (j = 0; j < SDL_arraysize(joystick_logicalmap); j++) {
if (!SDL_strcmp(name, joystick_logicalmap[j].name)
&& (nbuttons == -1
|| nbuttons == joystick_logicalmap[j].nbuttons)) {
prev = i;
SDL_joylist[prev].map = &(joystick_logicalmap[j]);
for (k = 1; k < joystick_logicalmap[j].njoys; k++) {
SDL_joylist[prev].next = max + ret;
SDL_joylist[max + ret].prev = prev;
prev = max + ret;
SDL_joylist[prev].logicalno = k;
SDL_joylist[prev].map = &(joystick_logicalmap[j]);
ret++;
}
break;
}
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}
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}
}
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return ret;
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}
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static void
LogicalSuffix(int logicalno, char *namebuf, int len)
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{
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register int slen;
const static char suffixs[] =
"01020304050607080910111213141516171819" "20212223242526272829303132";
const char *suffix;
slen = SDL_strlen(namebuf);
suffix = NULL;
if (logicalno * 2 < sizeof(suffixs))
suffix = suffixs + (logicalno * 2);
if (slen + 4 < len && suffix) {
namebuf[slen++] = ' ';
namebuf[slen++] = '#';
namebuf[slen++] = suffix[0];
namebuf[slen++] = suffix[1];
namebuf[slen++] = 0;
}
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}
#endif /* USE_LOGICAL_JOYSTICKS */
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#if SDL_INPUT_LINUXEV
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#define test_bit(nr, addr) \
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(((1UL << ((nr) % (sizeof(long) * 8))) & ((addr)[(nr) / (sizeof(long) * 8)])) != 0)
#define NBITS(x) ((((x)-1)/(sizeof(long) * 8))+1)
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static int
EV_IsJoystick(int fd)
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{
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unsigned long evbit[NBITS(EV_MAX)] = { 0 };
unsigned long keybit[NBITS(KEY_MAX)] = { 0 };
unsigned long absbit[NBITS(ABS_MAX)] = { 0 };
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if ((ioctl(fd, EVIOCGBIT(0, sizeof(evbit)), evbit) < 0) ||
(ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) ||
(ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0)) {
return (0);
}
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if (!(test_bit(EV_KEY, evbit) && test_bit(EV_ABS, evbit) &&
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test_bit(ABS_X, absbit) && test_bit(ABS_Y, absbit))) {
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return 0;
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}
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return (1);
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}
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#endif /* SDL_INPUT_LINUXEV */
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/* Function to scan the system for joysticks */
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int
SDL_SYS_JoystickInit(void)
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{
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/* The base path of the joystick devices */
const char *joydev_pattern[] = {
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#if SDL_INPUT_LINUXEV
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"/dev/input/event%d",
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#endif
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"/dev/input/js%d",
"/dev/js%d"
};
int numjoysticks;
int i, j;
int fd;
char path[PATH_MAX];
dev_t dev_nums[MAX_JOYSTICKS]; /* major/minor device numbers */
struct stat sb;
int n, duplicate;
numjoysticks = 0;
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/* First see if the user specified one or more joysticks to use */
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if (SDL_getenv("SDL_JOYSTICK_DEVICE") != NULL) {
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char *envcopy, *envpath, *delim;
envcopy = SDL_strdup(SDL_getenv("SDL_JOYSTICK_DEVICE"));
envpath = envcopy;
while (envpath != NULL) {
delim = SDL_strchr(envpath, ':');
if (delim != NULL) {
*delim++ = '\0';
}
if (stat(envpath, &sb) == 0) {
fd = open(envpath, O_RDONLY, 0);
if (fd >= 0) {
/* Assume the user knows what they're doing. */
SDL_joylist[numjoysticks].fname = SDL_strdup(envpath);
if (SDL_joylist[numjoysticks].fname) {
dev_nums[numjoysticks] = sb.st_rdev;
++numjoysticks;
}
close(fd);
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}
}
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envpath = delim;
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}
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SDL_free(envcopy);
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}
for (i = 0; i < SDL_arraysize(joydev_pattern); ++i) {
for (j = 0; j < MAX_JOYSTICKS; ++j) {
SDL_snprintf(path, SDL_arraysize(path), joydev_pattern[i], j);
/* rcg06302000 replaced access(F_OK) call with stat().
* stat() will fail if the file doesn't exist, so it's
* equivalent behaviour.
*/
if (stat(path, &sb) == 0) {
/* Check to make sure it's not already in list.
* This happens when we see a stick via symlink.
*/
duplicate = 0;
for (n = 0; (n < numjoysticks) && !duplicate; ++n) {
if (sb.st_rdev == dev_nums[n]) {
duplicate = 1;
}
}
if (duplicate) {
continue;
}
fd = open(path, O_RDONLY, 0);
if (fd < 0) {
continue;
}
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#if SDL_INPUT_LINUXEV
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#ifdef DEBUG_INPUT_EVENTS
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printf("Checking %s\n", path);
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#endif
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if ((i == 0) && !EV_IsJoystick(fd)) {
close(fd);
continue;
}
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#endif
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close(fd);
/* We're fine, add this joystick */
SDL_joylist[numjoysticks].fname = SDL_strdup(path);
if (SDL_joylist[numjoysticks].fname) {
dev_nums[numjoysticks] = sb.st_rdev;
++numjoysticks;
}
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}
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}
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#if SDL_INPUT_LINUXEV
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/* This is a special case...
If the event devices are valid then the joystick devices
will be duplicates but without extra information about their
hats or balls. Unfortunately, the event devices can't
currently be calibrated, so it's a win-lose situation.
So : /dev/input/eventX = /dev/input/jsY = /dev/jsY
*/
if ((i == 0) && (numjoysticks > 0))
break;
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#endif
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}
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#ifndef NO_LOGICAL_JOYSTICKS
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numjoysticks += CountLogicalJoysticks(numjoysticks);
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#endif
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return (numjoysticks);
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}
/* Function to get the device-dependent name of a joystick */
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const char *
SDL_SYS_JoystickName(int index)
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{
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int fd;
static char namebuf[128];
char *name;
SDL_logical_joydecl(int oindex = index);
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#ifndef NO_LOGICAL_JOYSTICKS
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SDL_joylist_head(index, index);
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#endif
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name = NULL;
fd = open(SDL_joylist[index].fname, O_RDONLY, 0);
if (fd >= 0) {
if (
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#if SDL_INPUT_LINUXEV
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(ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) <= 0) &&
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#endif
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(ioctl(fd, JSIOCGNAME(sizeof(namebuf)), namebuf) <= 0)) {
name = SDL_joylist[index].fname;
} else {
name = namebuf;
}
close(fd);
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#ifndef NO_LOGICAL_JOYSTICKS
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if (SDL_joylist[oindex].prev || SDL_joylist[oindex].next
|| index != oindex) {
LogicalSuffix(SDL_joylist[oindex].logicalno, namebuf, 128);
}
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#endif
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}
return name;
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}
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static int
allocate_hatdata(SDL_Joystick * joystick)
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{
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int i;
joystick->hwdata->hats =
(struct hwdata_hat *) SDL_malloc(joystick->nhats *
sizeof(struct hwdata_hat));
if (joystick->hwdata->hats == NULL) {
return (-1);
}
for (i = 0; i < joystick->nhats; ++i) {
joystick->hwdata->hats[i].axis[0] = 1;
joystick->hwdata->hats[i].axis[1] = 1;
}
return (0);
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}
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static int
allocate_balldata(SDL_Joystick * joystick)
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{
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int i;
joystick->hwdata->balls =
(struct hwdata_ball *) SDL_malloc(joystick->nballs *
sizeof(struct hwdata_ball));
if (joystick->hwdata->balls == NULL) {
return (-1);
}
for (i = 0; i < joystick->nballs; ++i) {
joystick->hwdata->balls[i].axis[0] = 0;
joystick->hwdata->balls[i].axis[1] = 0;
}
return (0);
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}
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static SDL_bool
JS_ConfigJoystick(SDL_Joystick * joystick, int fd)
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{
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SDL_bool handled;
unsigned char n;
int old_axes, tmp_naxes, tmp_nhats, tmp_nballs;
const char *name;
char *env, env_name[128];
int i;
handled = SDL_FALSE;
/* Default joystick device settings */
if (ioctl(fd, JSIOCGAXES, &n) < 0) {
joystick->naxes = 2;
} else {
joystick->naxes = n;
}
if (ioctl(fd, JSIOCGBUTTONS, &n) < 0) {
joystick->nbuttons = 2;
} else {
joystick->nbuttons = n;
}
name = SDL_SYS_JoystickName(joystick->index);
old_axes = joystick->naxes;
/* Generic analog joystick support */
if (SDL_strstr(name, "Analog") == name && SDL_strstr(name, "-hat")) {
if (SDL_sscanf(name, "Analog %d-axis %*d-button %d-hat",
&tmp_naxes, &tmp_nhats) == 2) {
joystick->naxes = tmp_naxes;
joystick->nhats = tmp_nhats;
handled = SDL_TRUE;
}
}
/* Special joystick support */
for (i = 0; i < SDL_arraysize(special_joysticks); ++i) {
if (SDL_strcmp(name, special_joysticks[i].name) == 0) {
joystick->naxes = special_joysticks[i].naxes;
joystick->nhats = special_joysticks[i].nhats;
joystick->nballs = special_joysticks[i].nballs;
handled = SDL_TRUE;
break;
}
}
/* User environment joystick support */
if ((env = SDL_getenv("SDL_LINUX_JOYSTICK"))) {
*env_name = '\0';
if (*env == '\'' && SDL_sscanf(env, "'%[^']s'", env_name) == 1)
env += SDL_strlen(env_name) + 2;
else if (SDL_sscanf(env, "%s", env_name) == 1)
env += SDL_strlen(env_name);
if (SDL_strcmp(name, env_name) == 0) {
if (SDL_sscanf(env, "%d %d %d", &tmp_naxes, &tmp_nhats,
&tmp_nballs) == 3) {
joystick->naxes = tmp_naxes;
joystick->nhats = tmp_nhats;
joystick->nballs = tmp_nballs;
handled = SDL_TRUE;
}
}
}
/* Remap hats and balls */
if (handled) {
if (joystick->nhats > 0) {
if (allocate_hatdata(joystick) < 0) {
joystick->nhats = 0;
}
}
if (joystick->nballs > 0) {
if (allocate_balldata(joystick) < 0) {
joystick->nballs = 0;
}
}
}
return (handled);
670
671
}
672
#if SDL_INPUT_LINUXEV
673
674
675
static SDL_bool
EV_ConfigJoystick(SDL_Joystick * joystick, int fd)
676
{
677
int i, t;
678
679
680
unsigned long keybit[NBITS(KEY_MAX)] = { 0 };
unsigned long absbit[NBITS(ABS_MAX)] = { 0 };
unsigned long relbit[NBITS(REL_MAX)] = { 0 };
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686
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689
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/* See if this device uses the new unified event API */
if ((ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) >= 0) &&
(ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) >= 0) &&
(ioctl(fd, EVIOCGBIT(EV_REL, sizeof(relbit)), relbit) >= 0)) {
joystick->hwdata->is_hid = SDL_TRUE;
/* Get the number of buttons, axes, and other thingamajigs */
for (i = BTN_JOYSTICK; i < KEY_MAX; ++i) {
if (test_bit(i, keybit)) {
691
#ifdef DEBUG_INPUT_EVENTS
692
printf("Joystick has button: 0x%x\n", i);
693
#endif
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696
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698
699
joystick->hwdata->key_map[i - BTN_MISC] = joystick->nbuttons;
++joystick->nbuttons;
}
}
for (i = BTN_MISC; i < BTN_JOYSTICK; ++i) {
if (test_bit(i, keybit)) {
700
#ifdef DEBUG_INPUT_EVENTS
701
printf("Joystick has button: 0x%x\n", i);
702
#endif
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joystick->hwdata->key_map[i - BTN_MISC] = joystick->nbuttons;
++joystick->nbuttons;
}
}
for (i = 0; i < ABS_MAX; ++i) {
/* Skip hats */
if (i == ABS_HAT0X) {
i = ABS_HAT3Y;
continue;
}
if (test_bit(i, absbit)) {
714
struct input_absinfo absinfo;
715
716
if (ioctl(fd, EVIOCGABS(i), &absinfo) < 0)
717
continue;
718
#ifdef DEBUG_INPUT_EVENTS
719
720
printf("Joystick has absolute axis: %x\n", i);
printf("Values = { %d, %d, %d, %d, %d }\n",
721
722
absinfo.value, absinfo.minimum, absinfo.maximum,
absinfo.fuzz, absinfo.flat);
723
#endif /* DEBUG_INPUT_EVENTS */
724
joystick->hwdata->abs_map[i] = joystick->naxes;
725
if (absinfo.minimum == absinfo.maximum) {
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727
728
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joystick->hwdata->abs_correct[i].used = 0;
} else {
joystick->hwdata->abs_correct[i].used = 1;
joystick->hwdata->abs_correct[i].coef[0] =
730
(absinfo.maximum + absinfo.minimum) / 2 - absinfo.flat;
731
joystick->hwdata->abs_correct[i].coef[1] =
732
733
(absinfo.maximum + absinfo.minimum) / 2 + absinfo.flat;
t = ((absinfo.maximum - absinfo.minimum) / 2 - 2 * absinfo.flat);
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if (t != 0) {
joystick->hwdata->abs_correct[i].coef[2] =
(1 << 29) / t;
} else {
joystick->hwdata->abs_correct[i].coef[2] = 0;
}
}
++joystick->naxes;
}
}
for (i = ABS_HAT0X; i <= ABS_HAT3Y; i += 2) {
if (test_bit(i, absbit) || test_bit(i + 1, absbit)) {
746
#ifdef DEBUG_INPUT_EVENTS
747
printf("Joystick has hat %d\n", (i - ABS_HAT0X) / 2);
748
#endif
749
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751
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767
768
++joystick->nhats;
}
}
if (test_bit(REL_X, relbit) || test_bit(REL_Y, relbit)) {
++joystick->nballs;
}
/* Allocate data to keep track of these thingamajigs */
if (joystick->nhats > 0) {
if (allocate_hatdata(joystick) < 0) {
joystick->nhats = 0;
}
}
if (joystick->nballs > 0) {
if (allocate_balldata(joystick) < 0) {
joystick->nballs = 0;
}
}
}
return (joystick->hwdata->is_hid);
769
770
}
771
#endif /* SDL_INPUT_LINUXEV */
772
773
#ifndef NO_LOGICAL_JOYSTICKS
774
775
static void
ConfigLogicalJoystick(SDL_Joystick * joystick)
776
{
777
778
779
780
781
782
783
784
785
struct joystick_logical_layout *layout;
layout = SDL_joylist[joystick->index].map->layout +
SDL_joylist[joystick->index].logicalno;
joystick->nbuttons = layout->nbuttons;
joystick->nhats = layout->nhats;
joystick->naxes = layout->naxes;
joystick->nballs = layout->nballs;
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787
788
789
}
#endif
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/* Function to open a joystick for use.
The joystick to open is specified by the index field of the joystick.
This should fill the nbuttons and naxes fields of the joystick structure.
It returns 0, or -1 if there is an error.
*/
795
796
int
SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
797
{
798
int fd;
799
char *fname;
800
801
SDL_logical_joydecl(int realindex);
SDL_logical_joydecl(SDL_Joystick * realjoy = NULL);
802
803
/* Open the joystick and set the joystick file descriptor */
804
#ifndef NO_LOGICAL_JOYSTICKS
805
806
807
if (SDL_joylist[joystick->index].fname == NULL) {
SDL_joylist_head(realindex, joystick->index);
realjoy = SDL_JoystickOpen(realindex);
808
809
810
811
812
if (realjoy == NULL)
return (-1);
fd = realjoy->hwdata->fd;
813
fname = realjoy->hwdata->fname;
814
815
816
} else {
fd = open(SDL_joylist[joystick->index].fname, O_RDONLY, 0);
817
fname = SDL_joylist[joystick->index].fname;
818
819
}
SDL_joylist[joystick->index].joy = joystick;
820
#else
821
fd = open(SDL_joylist[joystick->index].fname, O_RDONLY, 0);
822
fname = SDL_joylist[joystick->index].fname;
823
824
#endif
825
826
827
828
829
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831
832
833
834
835
836
837
if (fd < 0) {
SDL_SetError("Unable to open %s\n", SDL_joylist[joystick->index]);
return (-1);
}
joystick->hwdata = (struct joystick_hwdata *)
SDL_malloc(sizeof(*joystick->hwdata));
if (joystick->hwdata == NULL) {
SDL_OutOfMemory();
close(fd);
return (-1);
}
SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
joystick->hwdata->fd = fd;
838
joystick->hwdata->fname = fname;
839
840
841
842
843
/* Set the joystick to non-blocking read mode */
fcntl(fd, F_SETFL, O_NONBLOCK);
/* Get the number of buttons and axes on the joystick */
844
#ifndef NO_LOGICAL_JOYSTICKS
845
846
847
if (realjoy)
ConfigLogicalJoystick(joystick);
else
848
#endif
849
#if SDL_INPUT_LINUXEV
850
if (!EV_ConfigJoystick(joystick, fd))
851
#endif
852
JS_ConfigJoystick(joystick, fd);
853
854
return (0);
855
856
}
857
858
#ifndef NO_LOGICAL_JOYSTICKS
859
860
861
static SDL_Joystick *
FindLogicalJoystick(SDL_Joystick * joystick,
struct joystick_logical_mapping *v)
862
{
863
864
SDL_Joystick *logicaljoy;
register int i;
865
866
867
i = joystick->index;
logicaljoy = NULL;
868
869
870
871
/* get the fake joystick that will receive the event
*/
for (;;) {
872
873
874
875
876
if (SDL_joylist[i].logicalno == v->njoy) {
logicaljoy = SDL_joylist[i].joy;
break;
}
877
878
879
if (SDL_joylist[i].next == 0)
break;
880
881
i = SDL_joylist[i].next;
882
883
}
884
885
return logicaljoy;
886
887
}
888
889
890
891
892
static int
LogicalJoystickButton(SDL_Joystick * joystick, Uint8 button, Uint8 state)
{
struct joystick_logical_mapping *buttons;
SDL_Joystick *logicaljoy = NULL;
893
894
895
896
897
/* if there's no map then this is just a regular joystick
*/
if (SDL_joylist[joystick->index].map == NULL)
return 0;
898
899
900
901
902
/* get the logical joystick that will receive the event
*/
buttons = SDL_joylist[joystick->index].map->buttonmap + button;
logicaljoy = FindLogicalJoystick(joystick, buttons);
903
904
905
if (logicaljoy == NULL)
return 1;
906
907
SDL_PrivateJoystickButton(logicaljoy, buttons->nthing, state);
908
909
return 1;
910
911
}
912
913
static int
LogicalJoystickAxis(SDL_Joystick * joystick, Uint8 axis, Sint16 value)
914
{
915
916
struct joystick_logical_mapping *axes;
SDL_Joystick *logicaljoy = NULL;
917
918
919
920
921
/* if there's no map then this is just a regular joystick
*/
if (SDL_joylist[joystick->index].map == NULL)
return 0;
922
923
924
925
926
/* get the logical joystick that will receive the event
*/
axes = SDL_joylist[joystick->index].map->axismap + axis;
logicaljoy = FindLogicalJoystick(joystick, axes);
927
928
929
if (logicaljoy == NULL)
return 1;
930
931
SDL_PrivateJoystickAxis(logicaljoy, axes->nthing, value);
932
933
return 1;
934
935
936
}
#endif /* USE_LOGICAL_JOYSTICKS */
937
938
static __inline__ void
HandleHat(SDL_Joystick * stick, Uint8 hat, int axis, int value)
939
{
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
struct hwdata_hat *the_hat;
const Uint8 position_map[3][3] = {
{SDL_HAT_LEFTUP, SDL_HAT_UP, SDL_HAT_RIGHTUP},
{SDL_HAT_LEFT, SDL_HAT_CENTERED, SDL_HAT_RIGHT},
{SDL_HAT_LEFTDOWN, SDL_HAT_DOWN, SDL_HAT_RIGHTDOWN}
};
SDL_logical_joydecl(SDL_Joystick * logicaljoy = NULL);
SDL_logical_joydecl(struct joystick_logical_mapping *hats = NULL);
the_hat = &stick->hwdata->hats[hat];
if (value < 0) {
value = 0;
} else if (value == 0) {
value = 1;
} else if (value > 0) {
value = 2;
}
if (value != the_hat->axis[axis]) {
the_hat->axis[axis] = value;
959
960
#ifndef NO_LOGICAL_JOYSTICKS
961
962
963
964
965
966
967
968
969
970
971
972
973
974
/* if there's no map then this is just a regular joystick
*/
if (SDL_joylist[stick->index].map != NULL) {
/* get the fake joystick that will receive the event
*/
hats = SDL_joylist[stick->index].map->hatmap + hat;
logicaljoy = FindLogicalJoystick(stick, hats);
}
if (logicaljoy) {
stick = logicaljoy;
hat = hats->nthing;
}
975
976
#endif /* USE_LOGICAL_JOYSTICKS */
977
SDL_PrivateJoystickHat(stick, hat,
978
979
position_map[the_hat->
axis[1]][the_hat->axis[0]]);
980
}
981
982
}
983
984
static __inline__ void
HandleBall(SDL_Joystick * stick, Uint8 ball, int axis, int value)
985
{
986
stick->hwdata->balls[ball].axis[axis] += value;
987
988
989
990
991
992
993
}
/* Function to update the state of a joystick - called as a device poll.
* This function shouldn't update the joystick structure directly,
* but instead should call SDL_PrivateJoystick*() to deliver events
* and update joystick device state.
*/
994
995
static __inline__ void
JS_HandleEvents(SDL_Joystick * joystick)
996
{
997
998
999
struct js_event events[32];
int i, len;
Uint8 other_axis;
1000