mirror of
https://github.com/CTCaer/RetroArch.git
synced 2024-12-22 02:38:11 +00:00
151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
/* RetroArch - A frontend for libretro.
|
|
* Copyright (C) 2010-2013 - Hans-Kristian Arntzen
|
|
*
|
|
* RetroArch is free software: you can redistribute it and/or modify it under the terms
|
|
* of the GNU General Public License as published by the Free Software Found-
|
|
* ation, either version 3 of the License, or (at your option) any later version.
|
|
*
|
|
* RetroArch 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with RetroArch.
|
|
* If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "input_common.h"
|
|
#include "../general.h"
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <fcntl.h>
|
|
#include <linux/joystick.h>
|
|
|
|
#define NUM_BUTTONS 32
|
|
#define NUM_AXES 32
|
|
|
|
struct linuxraw_joypad
|
|
{
|
|
int fd;
|
|
bool buttons[NUM_BUTTONS];
|
|
int16_t axes[NUM_AXES];
|
|
};
|
|
|
|
static struct linuxraw_joypad g_pads[MAX_PLAYERS];
|
|
|
|
static void poll_pad(struct linuxraw_joypad *pad)
|
|
{
|
|
struct js_event event;
|
|
while (read(pad->fd, &event, sizeof(event)) == (ssize_t)sizeof(event))
|
|
{
|
|
unsigned type = event.type & ~JS_EVENT_INIT;
|
|
|
|
switch (type)
|
|
{
|
|
case JS_EVENT_BUTTON:
|
|
if (event.number < NUM_BUTTONS)
|
|
pad->buttons[event.number] = event.value;
|
|
break;
|
|
|
|
case JS_EVENT_AXIS:
|
|
if (event.number < NUM_AXES)
|
|
pad->axes[event.number] = event.value;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void linuxraw_joypad_poll(void)
|
|
{
|
|
for (unsigned i = 0; i < MAX_PLAYERS; i++)
|
|
{
|
|
struct linuxraw_joypad *pad = &g_pads[i];
|
|
if (pad->fd < 0)
|
|
continue;
|
|
|
|
poll_pad(pad);
|
|
}
|
|
}
|
|
|
|
static bool linuxraw_joypad_init(void)
|
|
{
|
|
bool has_pad = false;
|
|
|
|
for (unsigned i = 0; i < MAX_PLAYERS; i++)
|
|
{
|
|
struct linuxraw_joypad *pad = &g_pads[i];
|
|
|
|
char path[PATH_MAX];
|
|
snprintf(path, sizeof(path), "/dev/input/js%u", i);
|
|
pad->fd = open(path, O_RDONLY | O_NONBLOCK);
|
|
|
|
has_pad |= pad->fd >= 0;
|
|
}
|
|
|
|
// Get initial state.
|
|
if (has_pad)
|
|
linuxraw_joypad_poll();
|
|
|
|
return has_pad;
|
|
}
|
|
|
|
static void linuxraw_joypad_destroy(void)
|
|
{
|
|
for (unsigned i = 0; i < MAX_PLAYERS; i++)
|
|
{
|
|
if (g_pads[i].fd >= 0)
|
|
close(g_pads[i].fd);
|
|
}
|
|
|
|
memset(g_pads, 0, sizeof(g_pads));
|
|
for (unsigned i = 0; i < MAX_PLAYERS; i++)
|
|
g_pads[i].fd = -1;
|
|
}
|
|
|
|
static bool linuxraw_joypad_button(unsigned port, uint16_t joykey)
|
|
{
|
|
const struct linuxraw_joypad *pad = &g_pads[port];
|
|
|
|
return joykey < NUM_BUTTONS && pad->buttons[joykey];
|
|
}
|
|
|
|
static int16_t linuxraw_joypad_axis(unsigned port, uint32_t joyaxis)
|
|
{
|
|
if (joyaxis == AXIS_NONE)
|
|
return 0;
|
|
|
|
const struct linuxraw_joypad *pad = &g_pads[port];
|
|
|
|
int16_t val = 0;
|
|
if (AXIS_NEG_GET(joyaxis) < NUM_AXES)
|
|
{
|
|
val = pad->axes[AXIS_NEG_GET(joyaxis)];
|
|
if (val > 0)
|
|
val = 0;
|
|
// Kernel returns values in range [-0x7fff, 0x7fff].
|
|
}
|
|
else if (AXIS_POS_GET(joyaxis) < NUM_AXES)
|
|
{
|
|
val = pad->axes[AXIS_POS_GET(joyaxis)];
|
|
if (val < 0)
|
|
val = 0;
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static bool linuxraw_joypad_query_pad(unsigned pad)
|
|
{
|
|
return pad < MAX_PLAYERS && g_pads[pad].fd >= 0;
|
|
}
|
|
|
|
const rarch_joypad_driver_t linuxraw_joypad = {
|
|
linuxraw_joypad_init,
|
|
linuxraw_joypad_query_pad,
|
|
linuxraw_joypad_destroy,
|
|
linuxraw_joypad_button,
|
|
linuxraw_joypad_axis,
|
|
linuxraw_joypad_poll,
|
|
"linuxraw",
|
|
};
|
|
|