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SDL_sysjoystick.c
1225 lines (1064 loc) · 35.1 KB
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2009 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;
/* First see if the user specified a joystick to use */
if (SDL_getenv("SDL_JOYSTICK_DEVICE") != NULL) {
SDL_strlcpy(path, SDL_getenv("SDL_JOYSTICK_DEVICE"), sizeof(path));
if (stat(path, &sb) == 0) {
fd = open(path, O_RDONLY, 0);
if (fd >= 0) {
/* Assume the user knows what they're doing. */
SDL_joylist[numjoysticks].fname = SDL_strdup(path);
if (SDL_joylist[numjoysticks].fname) {
dev_nums[numjoysticks] = sb.st_rdev;
++numjoysticks;
}
close(fd);
}
}
}
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);
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}
662
#if SDL_INPUT_LINUXEV
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static SDL_bool
EV_ConfigJoystick(SDL_Joystick * joystick, int fd)
666
{
667
int i, t;
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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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/* 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)) {
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#ifdef DEBUG_INPUT_EVENTS
682
printf("Joystick has button: 0x%x\n", i);
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#endif
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joystick->hwdata->key_map[i - BTN_MISC] = joystick->nbuttons;
++joystick->nbuttons;
}
}
for (i = BTN_MISC; i < BTN_JOYSTICK; ++i) {
if (test_bit(i, keybit)) {
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#ifdef DEBUG_INPUT_EVENTS
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printf("Joystick has button: 0x%x\n", i);
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#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)) {
int values[5];
if (ioctl(fd, EVIOCGABS(i), values) < 0)
continue;
708
#ifdef DEBUG_INPUT_EVENTS
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printf("Joystick has absolute axis: %x\n", i);
printf("Values = { %d, %d, %d, %d, %d }\n",
values[0], values[1], values[2], values[3], values[4]);
712
#endif /* DEBUG_INPUT_EVENTS */
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joystick->hwdata->abs_map[i] = joystick->naxes;
if (values[1] == values[2]) {
joystick->hwdata->abs_correct[i].used = 0;
} else {
joystick->hwdata->abs_correct[i].used = 1;
joystick->hwdata->abs_correct[i].coef[0] =
(values[2] + values[1]) / 2 - values[4];
joystick->hwdata->abs_correct[i].coef[1] =
(values[2] + values[1]) / 2 + values[4];
t = ((values[2] - values[1]) / 2 - 2 * values[4]);
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)) {
735
#ifdef DEBUG_INPUT_EVENTS
736
printf("Joystick has hat %d\n", (i - ABS_HAT0X) / 2);
737
#endif
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++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);
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}
760
#endif /* SDL_INPUT_LINUXEV */
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#ifndef NO_LOGICAL_JOYSTICKS
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static void
ConfigLogicalJoystick(SDL_Joystick * joystick)
765
{
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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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}
#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.
*/
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int
SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
786
{
787
int fd;
788
char *fname;
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SDL_logical_joydecl(int realindex);
SDL_logical_joydecl(SDL_Joystick * realjoy = NULL);
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/* Open the joystick and set the joystick file descriptor */
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#ifndef NO_LOGICAL_JOYSTICKS
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if (SDL_joylist[joystick->index].fname == NULL) {
SDL_joylist_head(realindex, joystick->index);
realjoy = SDL_JoystickOpen(realindex);
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if (realjoy == NULL)
return (-1);
fd = realjoy->hwdata->fd;
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fname = realjoy->hwdata->fname;
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805
} else {
fd = open(SDL_joylist[joystick->index].fname, O_RDONLY, 0);
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fname = SDL_joylist[joystick->index].fname;
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808
}
SDL_joylist[joystick->index].joy = joystick;
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#else
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fd = open(SDL_joylist[joystick->index].fname, O_RDONLY, 0);
811
fname = SDL_joylist[joystick->index].fname;
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#endif
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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;
827
joystick->hwdata->fname = fname;
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/* Set the joystick to non-blocking read mode */
fcntl(fd, F_SETFL, O_NONBLOCK);
/* Get the number of buttons and axes on the joystick */
833
#ifndef NO_LOGICAL_JOYSTICKS
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if (realjoy)
ConfigLogicalJoystick(joystick);
else
837
#endif
838
#if SDL_INPUT_LINUXEV
839
if (!EV_ConfigJoystick(joystick, fd))
840
#endif
841
JS_ConfigJoystick(joystick, fd);
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843
return (0);
844
845
}
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#ifndef NO_LOGICAL_JOYSTICKS
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static SDL_Joystick *
FindLogicalJoystick(SDL_Joystick * joystick,
struct joystick_logical_mapping *v)
851
{
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853
SDL_Joystick *logicaljoy;
register int i;
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856
i = joystick->index;
logicaljoy = NULL;
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/* get the fake joystick that will receive the event
*/
for (;;) {
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865
if (SDL_joylist[i].logicalno == v->njoy) {
logicaljoy = SDL_joylist[i].joy;
break;
}
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867
868
if (SDL_joylist[i].next == 0)
break;
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870
i = SDL_joylist[i].next;
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872
}
873
874
return logicaljoy;
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876
}
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881
static int
LogicalJoystickButton(SDL_Joystick * joystick, Uint8 button, Uint8 state)
{
struct joystick_logical_mapping *buttons;
SDL_Joystick *logicaljoy = NULL;
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883
884
885
886
/* if there's no map then this is just a regular joystick
*/
if (SDL_joylist[joystick->index].map == NULL)
return 0;
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888
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890
891
/* get the logical joystick that will receive the event
*/
buttons = SDL_joylist[joystick->index].map->buttonmap + button;
logicaljoy = FindLogicalJoystick(joystick, buttons);
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893
894
if (logicaljoy == NULL)
return 1;
895
896
SDL_PrivateJoystickButton(logicaljoy, buttons->nthing, state);
897
898
return 1;
899
900
}
901
902
static int
LogicalJoystickAxis(SDL_Joystick * joystick, Uint8 axis, Sint16 value)
903
{
904
905
struct joystick_logical_mapping *axes;
SDL_Joystick *logicaljoy = NULL;
906
907
908
909
910
/* if there's no map then this is just a regular joystick
*/
if (SDL_joylist[joystick->index].map == NULL)
return 0;
911
912
913
914
915
/* get the logical joystick that will receive the event
*/
axes = SDL_joylist[joystick->index].map->axismap + axis;
logicaljoy = FindLogicalJoystick(joystick, axes);
916
917
918
if (logicaljoy == NULL)
return 1;
919
920
SDL_PrivateJoystickAxis(logicaljoy, axes->nthing, value);
921
922
return 1;
923
924
925
}
#endif /* USE_LOGICAL_JOYSTICKS */
926
927
static __inline__ void
HandleHat(SDL_Joystick * stick, Uint8 hat, int axis, int value)
928
{
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
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;
948
949
#ifndef NO_LOGICAL_JOYSTICKS
950
951
952
953
954
955
956
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959
960
961
962
963
/* 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;
}
964
965
#endif /* USE_LOGICAL_JOYSTICKS */
966
SDL_PrivateJoystickHat(stick, hat,
967
968
position_map[the_hat->
axis[1]][the_hat->axis[0]]);
969
}
970
971
}
972
973
static __inline__ void
HandleBall(SDL_Joystick * stick, Uint8 ball, int axis, int value)
974
{
975
stick->hwdata->balls[ball].axis[axis] += value;
976
977
978
979
980
981
982
}
/* 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.
*/
983
984
static __inline__ void
JS_HandleEvents(SDL_Joystick * joystick)
985
{
986
987
988
struct js_event events[32];
int i, len;
Uint8 other_axis;
989
990
#ifndef NO_LOGICAL_JOYSTICKS
991
992
993
994
995
if (SDL_joylist[joystick->index].fname == NULL) {
SDL_joylist_head(i, joystick->index);
JS_HandleEvents(SDL_joylist[i].joy);
return;
}
996
997
#endif
998
999
1000
while ((len = read(joystick->hwdata->fd, events, (sizeof events))) > 0) {
len /= sizeof(events[0]);
for (i = 0; i < len; ++i) {