quakeforge/libs/input/in_binding.c

/*
	in_binding.c

	Input binding management

	Copyright (C) 2021 Bill Currie <bill@taniwha.org>

	Author: Bill Currie <bill@taniwha.org>
	Date: 2021/11/2

	This program 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 Foundation; either version 2
	of the License, or (at your option) any later version.

	This program 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 this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif

#include "QF/cexpr.h"
#include "QF/cmd.h"
#include "QF/cmem.h"
#include "QF/dstring.h"
#include "QF/hash.h"
#include "QF/heapsort.h"
#include "QF/input.h"
#include "QF/plist.h"
#include "QF/progs.h"   // for PR_RESMAP
#include "QF/sys.h"
#include "QF/va.h"

#include "QF/input/imt.h"

#include "QF/input/binding.h"
#include "QF/input/event.h"
#include "QF/input/imt.h"

/*** Connect a device and its axes and buttons to logical axes and buttons.

	\a name is used to specify the device when creating bindings, and
	identifying the device for hints etc (eg, "press joy1 1 to ...").

	\a devname is the device name (eg, "6d spacemouse")

	\a id is the device id (eg "usb-0000:00:1d.1-2/input0").

	The device name is useful for ease of user identification and allowing
	the device to be plugged into any USB socket. However, it doesn't allow
	multiple devices with the same name (eg, using twin joysticks of the same
	model). Thus if \a match_id is true, both the device name and the device
	id used to auto-connect the device, but it does require the device to be
	plugged into the same uSB path (ie, same socket on the same hub connected
	to the same port on the PC)

	\a devid is the actual device associated with the bindings. If -1, the
	device is not currently connected.

	\a axis_info holds the device/axis specific range info and the current
	raw value of the axis.

	\a button_info holds the current raw state of the button

	\a axis_imt_id is -1 if the device has no axis bindings, otherwise it is
    the base index into the imt axis bindings array.

	\a button_imt_id is -1 if the device has no button bindings, otherwise it
    is the base index into the imt button bindings array.
*/
typedef struct in_devbindings_s {
	struct in_devbindings_s *next;
	char       *name;		///< name used when binding inputs
	char       *devname;	///< physical device name
	char       *id;			///< physical device id
	int         match_id;	///< if true, both devname and id must match
	int         devid;		///< id of device associated with these bindings
	int         num_axes;
	int         num_buttons;
	in_axisinfo_t *axis_info;		///< axis range info and raw state
	in_buttoninfo_t *button_info;	///< button raw state
    int         axis_imt_id;    ///< index into array of imt axis bindings
    int         button_imt_id;  ///< index into array of imt button bindings
} in_devbindings_t;

typedef struct DARRAY_TYPE (int) in_knowndevset_t;

static in_knowndevset_t known_devices = DARRAY_STATIC_INIT (8);
static int in_binding_handler;
static int in_keyhelp_handler;
static int in_keyhelp_saved_handler;

static PR_RESMAP (in_devbindings_t) devbindings;
static in_devbindings_t *devbindings_list;

static int
devid_cmp (const void *a, const void *b)
{
	return *(const int *)a - *(const int *)b;
}

static int * __attribute__ ((pure))
in_find_devid (int devid)
{
	return bsearch (&devid, known_devices.a, known_devices.size,
					sizeof (int), devid_cmp);
}

static in_devbindings_t * __attribute__ ((pure))
in_binding_find_connection (const char *devname, const char *id)
{
	in_devbindings_t *db;

	//FIXME slow
	for (db = devbindings_list; db; db = db->next) {
		if (strcmp (devname, db->devname) != 0) {
			continue;
		}
		if (db->match_id && strcmp (id, db->id) != 0) {
			continue;
		}
		return db;
	}
	return 0;
}

static void
alloc_input_info (in_devbindings_t *db)
{
	db->axis_info = malloc (db->num_axes * sizeof (in_axisinfo_t)
							+ db->num_buttons * sizeof (in_buttoninfo_t));
	db->button_info = (in_buttoninfo_t *) &db->axis_info[db->num_axes];
}

static void
in_binding_add_device (const IE_event_t *ie_event)
{
	size_t      devid = ie_event->device.devid;
	const char *devname = IN_GetDeviceName (devid);
	const char *id = IN_GetDeviceId (devid);

	if (!in_find_devid (devid)) {
		DARRAY_APPEND (&known_devices, devid);
		// keep the known devices sorted by id
		heapsort (known_devices.a, known_devices.size, sizeof (int), devid_cmp);
		Sys_Printf ("Added device %s %s\n", devname, id);
	}

	in_devbindings_t *db = IN_GetDeviceEventData (devid);
	if (db) {
		return;
	}

	db = in_binding_find_connection (devname, id);

	if (db) {
		if (db->match_id) {
			Sys_Printf ("Reconnected %s to %s %s\n", db->name, devname, id);
		} else {
			Sys_Printf ("Reconnected %s to %s\n", db->name, devname);
		}
		db->devid = devid;
		IN_SetDeviceEventData (devid, db);
		if (!db->axis_info) {
			alloc_input_info (db);
		}
		IN_AxisInfo (devid, db->axis_info, &db->num_axes);
		IN_ButtonInfo (devid, db->button_info, &db->num_buttons);
	}
}

static void
in_binding_remove_device (const IE_event_t *ie_event)
{
	size_t      devid = ie_event->device.devid;
	in_devbindings_t *db = IN_GetDeviceEventData (devid);
	int        *kd;

	if (!(kd = in_find_devid (devid))) {
		Sys_Error ("in_binding_remove_device: invalid devid: %zd", devid);
	}
	DARRAY_REMOVE_AT (&known_devices, kd - known_devices.a);

	const char *devname = IN_GetDeviceName (devid);
	const char *id = IN_GetDeviceId (devid);
	if (db) {
		db->devid = -1;
		if (db->match_id) {
			Sys_Printf ("Disconnected %s from %s %s\n", db->name, devname, id);
		} else {
			Sys_Printf ("Disconnected %s from %s\n", db->name, devname);
		}
	}
	Sys_Printf ("Removed device %s %s\n", devname, id);
}

static void
in_binding_axis (const IE_event_t *ie_event)
{
	int         axis = ie_event->axis.axis;
	int         value = ie_event->axis.value;
	in_devbindings_t *db = ie_event->axis.data;;

	if (db && axis < db->num_axes) {
		db->axis_info[axis].value = value;
		if (db->axis_imt_id >= 0) {
			IMT_ProcessAxis (db->axis_imt_id + axis, value);
		}
	}
}

static void
in_binding_button (const IE_event_t *ie_event)
{
	int         button = ie_event->button.button;
	int         state = ie_event->button.state;
	in_devbindings_t *db = ie_event->button.data;

	if (db && button < db->num_buttons) {
		db->button_info[button].state = state;
		if (db->button_imt_id >= 0) {
			IMT_ProcessButton (db->button_imt_id + button, state);
		}
	}
}

static int
in_binding_event_handler (const IE_event_t *ie_event, void *unused)
{
	static void (*handlers[ie_event_count]) (const IE_event_t *ie_event) = {
		[ie_add_device] = in_binding_add_device,
		[ie_remove_device] = in_binding_remove_device,
	};
	if ((unsigned) ie_event->type >= ie_event_count
		|| !handlers[ie_event->type]) {
		return 0;
	}
	handlers[ie_event->type] (ie_event);
	return 1;
}

int
IN_Binding_HandleEvent (const IE_event_t *ie_event)
{
	static void (*handlers[ie_event_count]) (const IE_event_t *ie_event) = {
		[ie_axis] = in_binding_axis,
		[ie_button] = in_binding_button,
	};
	if ((unsigned) ie_event->type >= ie_event_count
		|| !handlers[ie_event->type]) {
		return 0;
	}
	handlers[ie_event->type] (ie_event);
	return 1;
}

static int keyhelp_axis_threshold;

static int
in_keyhelp_event_handler (const IE_event_t *ie_event, void *unused)
{
	if (ie_event->type != ie_axis && ie_event->type != ie_button) {
		return 0;
	}

	size_t      devid = ie_event->button.devid;
	in_devbindings_t *db = ie_event->button.data;
	const char *bind_name = db ? db->name : 0;
	const char *type = 0;
	int         num = -1;
	const char *devname = IN_GetDeviceName (devid);
	const char *id = IN_GetDeviceId (devid);
	const char *name = 0;

	if (ie_event->type == ie_axis) {
		int         axis = ie_event->axis.axis;
		int         value = ie_event->axis.value;
		in_axisinfo_t *ai;
		if (db) {
			ai = &db->axis_info[axis];
		} else {
			in_axisinfo_t axis_info;
			IN_GetAxisInfo (devid, axis, &axis_info);
			ai = &axis_info;
		}
		if (!ai->min && !ai->max) {
			if (abs (value) > keyhelp_axis_threshold) {
				num = axis;
				type = "axis";
			}
		} else {
			//FIXME does not work if device has not been connected (db is null)
			int         diff = abs (value - ai->value);
			if (diff * 5 >= ai->max - ai->min) {
				num = axis;
				type = "axis";
			}
		}
		name = IN_GetAxisName (devid, num);
	} else if (ie_event->type == ie_button) {
		if (ie_event->button.state) {
			num = ie_event->button.button;
			type = "button";
		}
		name = IN_GetButtonName (devid, num);
	}
	if (!type) {
		return 0;
	}
	IE_Set_Focus (in_keyhelp_saved_handler);
	Sys_Printf ("%s (%s %s) %s %d (%s)\n", bind_name, devname, id, type, num,
				name ? name : "");
	return 1;
}

static in_devbindings_t * __attribute__ ((pure))
in_binding_find_device (const char *name)
{
	in_devbindings_t *db;

	for (db = devbindings_list; db; db = db->next) {
		if (strcmp (name, db->name) == 0) {
			break;
		}
	}
	return db;
}

static void
clear_connection (in_devbindings_t *db)
{
	if (db->devid >= 0) {
		IN_SetDeviceEventData (db->devid, 0);
	}
	free (db->name);
	free (db->devname);
	free (db->id);
	free (db->axis_info);
}

static void
in_bind_f (void)
{
	int         argc = Cmd_Argc ();
	if (argc < 6) {
		Sys_Printf ("in_bind imt device type number binding...\n");
		Sys_Printf ("    imt: the name of the input mapping table in which the"
					" intput will be bound\n");
		Sys_Printf ("    device: the nickname or id of the device owning"
					" the input to be bound\n");
		Sys_Printf ("    type: the type of input to be bound (axis or"
					" button)\n");
		// FIXME support names
		Sys_Printf ("    number: the numeric id of the input to be bound\n");
		Sys_Printf ("    binding...: the destination to which the input will"
					" be bound\n");
		Sys_Printf ("        for axis inputs, this can be an analog input or"
					" an axis-button\n");
		Sys_Printf ("        for button inputs, this can be a button or a"
					" command (spaces ok, but\n"
					"        quotes recommended)\n");
		return;
	}

	const char *imt_name = Cmd_Argv (1);
	const char *dev_name = Cmd_Argv (2);
	const char *type = Cmd_Argv (3);
	const char *number = Cmd_Argv (4);

	imt_t      *imt = IMT_FindIMT (imt_name);
	in_devbindings_t *dev = in_binding_find_device (dev_name);
	char       *end;
	int         num = strtol (number, &end, 0);
	if (!imt) {
		Sys_Printf ("unknown imt: %s\n", imt_name);
		return;
	}
	if (!dev) {
		Sys_Printf ("unknown device: %s\n", dev_name);
		return;
	}
	if (strcmp (type, "axis") != 0 && strcmp (type, "button") != 0) {
		Sys_Printf ("invalid input type: %s\n", type);
		return;
	}
	if (*type == 'a') {
		if (*end) {
			num = IN_GetAxisNumber (dev->devid, number);
		}
		if (num < 0 || num >= dev->num_axes) {
			Sys_Printf ("invalid axis number: %s\n", number);
			return;
		}
		if (dev->axis_imt_id == -1) {
			dev->axis_imt_id = IMT_GetAxisBlock (dev->num_axes);
		}
		const char *axis_name = Cmd_Argv (5);
		in_axis_t  *axis = IN_FindAxis (axis_name);
		if (!axis) {
			Sys_Printf ("unknown axis: %s\n", axis_name);
			return;
		}
		in_axisinfo_t *axisinfo = &dev->axis_info[num];
		in_recipe_t recipe = {
			.min = axisinfo->min,
			.max = axisinfo->max,
			.curve = 1,
			.scale = 1,
		};
		double curve = recipe.curve;
		double scale = recipe.scale;
		exprsym_t   var_syms[] = {
			{"minzone", &cexpr_int, &recipe.minzone},
			{"maxzone", &cexpr_int, &recipe.maxzone},
			{"deadzone", &cexpr_int, &recipe.deadzone},
			{"curve", &cexpr_double, &curve},
			{"scale", &cexpr_double, &scale},
			{}
		};
		exprtab_t   vars_tab = { var_syms, 0 };
		exprctx_t   exprctx = {
			.symtab = &vars_tab,
			.memsuper = new_memsuper (),
			.messages = PL_NewArray (),
		};
		cexpr_init_symtab (&vars_tab, &exprctx);

		int     i;
		for (i = 6; i < argc; i++) {
			const char *arg = Cmd_Argv (i);
			if (cexpr_eval_string (arg, &exprctx)) {
				plitem_t   *messages = exprctx.messages;
				for (int j = 0; j < PL_A_NumObjects (messages); j++) {
					Sys_Printf ("%s\n",
								PL_String (PL_ObjectAtIndex (messages, j)));
				}
				break;
			}
		}
		if (i == argc) {
			recipe.curve = curve;
			recipe.scale = scale;
			IMT_BindAxis (imt, dev->axis_imt_id + num, axis, &recipe);
		}
		Hash_DelTable (vars_tab.tab);
		PL_Release (exprctx.messages);
		delete_memsuper (exprctx.memsuper);
	} else {
		// the rest of the command line is the binding
		// However, have to put the args into a single string ourselves because
		// Cmd_Args includes any quotes used to build compound commands
		static dstring_t *binding;
		if (!binding) {
			binding = dstring_new ();
		}
		dsprintf (binding, "%s", Cmd_Argv (5));
		for (int i = 6; i < argc; i++) {
			dasprintf (binding, " %s", Cmd_Argv (i));
		}

		if (*end) {
			num = IN_GetButtonNumber (dev->devid, number);
		}
		if (num < 0 || num >= dev->num_buttons) {
			Sys_Printf ("invalid button number: %s\n", number);
			return;
		}
		if (dev->button_imt_id == -1) {
			dev->button_imt_id = IMT_GetButtonBlock (dev->num_buttons);
		}
		IMT_BindButton (imt, dev->button_imt_id + num, binding->str);
	}
}

static void
in_unbind_f (void)
{
	if (Cmd_Argc () < 5) {
		Sys_Printf ("in_unbind imt device type number\n");
		Sys_Printf ("    imt: the name of the input mapping table in which the"
					" intput will be unbound\n");
		Sys_Printf ("    device: the nickname or id of the devise owning"
					" the input to be unbound\n");
		Sys_Printf ("    type: the type of input to be unbound (axis or"
					" button)\n");
		// FIXME support names
		Sys_Printf ("    number: the numeric id of the input to be unbound\n");
		return;
	}

	const char *imt_name = Cmd_Argv (1);
	const char *dev_name = Cmd_Argv (2);
	const char *type = Cmd_Argv (3);
	const char *number = Cmd_Argv (4);

	imt_t      *imt = IMT_FindIMT (imt_name);
	in_devbindings_t *dev = in_binding_find_device (dev_name);
	char       *end;
	int         num = strtol (number, &end, 0);
	if (!imt) {
		Sys_Printf ("unknown imt: %s\n", imt_name);
		return;
	}
	if (!dev) {
		Sys_Printf ("unknown device: %s\n", dev_name);
		return;
	}
	if (strcmp (type, "axis") != 0 && strcmp (type, "button") != 0) {
		Sys_Printf ("invalid input type: %s\n", type);
		return;
	}
	if (*type == 'a') {
		if (*end || num < 0 || num >= dev->num_axes) {
			Sys_Printf ("invalid axis number: %s\n", number);
			return;
		}
		IMT_BindAxis (imt, dev->axis_imt_id + num, 0, 0);
	} else {
		if (*end || num < 0 || num >= dev->num_buttons) {
			Sys_Printf ("invalid button number: %s\n", number);
			return;
		}
		IMT_BindButton (imt, dev->button_imt_id + num, 0);
	}
}

static void
in_clear_f (void)
{
	int         argc = Cmd_Argc ();
	if (argc < 2) {
		Sys_Printf ("in_clear imt [imt...]\n");
		return;
	}
	for (int i = 1; i < argc; i++) {
		const char *imt_name = Cmd_Argv (i);
		imt_t      *imt = IMT_FindIMT (imt_name);
		if (!imt) {
			Sys_Printf ("unknown imt: %s\n", imt_name);
			continue;
		}
		for (size_t ind = 0; ind < imt->axis_bindings.size; ind++) {
			IMT_BindAxis (imt, ind, 0, 0);
		}
		for (size_t ind = 0; ind < imt->button_bindings.size; ind++) {
			IMT_BindButton (imt, ind, 0);
		}
	}
}

static void
in_devices_f (void)
{
	for (size_t i = 0; i < known_devices.size; i++) {
		int     devid = known_devices.a[i];
		in_devbindings_t *db = IN_GetDeviceEventData (devid);
		const char *name = IN_GetDeviceName (devid);
		const char *id = IN_GetDeviceId (devid);
		int         num_axes, num_buttons;
		IN_AxisInfo (devid, 0, &num_axes);
		IN_ButtonInfo (devid, 0, &num_buttons);

		Sys_Printf ("devid %d:\n", devid);
		if (db) {
			Sys_Printf ("    bind name: %s\n", db->name);
		} else {
			Sys_Printf ("    no bind name\n");
		}
		Sys_Printf ("    name: %s\n", name);
		Sys_Printf ("    id: %s\n", id);
		Sys_Printf ("    axes: %d\n", num_axes);
		Sys_Printf ("    buttons: %d\n", num_buttons);
	}
}

static void
in_connect_f (void)
{
	int         argc = Cmd_Argc ();
	const char *fullid = 0;

	if (argc == 4) {
		fullid = Cmd_Argv (3);
	}
	if (argc < 3 || argc > 4 || (fullid && strcmp (fullid, "fullid"))) {
		goto in_connect_usage;
	}
	const char *bindname = Cmd_Argv (1);
	const char *device_id = Cmd_Argv (2);
	int         devid = -1;

	if (in_binding_find_device (bindname)) {
		Sys_Printf ("%s already exists\n", bindname);
		return;
	}

	if (device_id[0] == '#') {
		char       *end;
		devid = strtol (device_id + 1, &end, 0);
		if (*end || !in_find_devid (devid)) {
			Sys_Printf ("Not a valid device number: %s", device_id);
			return;
		}
	} else {
		int         len = strlen (device_id);

		for (size_t i = 0; i < known_devices.size; i++) {
			if (strcmp (device_id, IN_GetDeviceId (known_devices.a[i])) == 0) {
				devid = known_devices.a[i];
				break;
			}
			if (strncasecmp (device_id,
							 IN_GetDeviceName (known_devices.a[i]),
							 len) == 0) {
				if (devid > -1) {
					Sys_Printf ("'%s' is ambiguous\n", device_id);
					return;
				}
				devid = known_devices.a[i];
			}
		}
	}
	if (devid == -1) {
		Sys_Printf ("No such device: %s\n", device_id);
		return;
	}
	if (IN_GetDeviceEventData (devid)) {
		Sys_Printf ("%s already connected\n", device_id);
		return;
	}

	in_devbindings_t *db = PR_RESNEW (devbindings);
	db->next = devbindings_list;
	devbindings_list = db;

	db->name = strdup (bindname);
	db->devname = strdup (IN_GetDeviceName (devid));
	db->id = strdup (IN_GetDeviceId (devid));
	db->match_id = !!fullid;
	db->devid = devid;

	IN_AxisInfo (devid, 0, &db->num_axes);
	IN_ButtonInfo (devid, 0, &db->num_buttons);
	alloc_input_info (db);
	IN_AxisInfo (devid, db->axis_info, &db->num_axes);
	IN_ButtonInfo (devid, db->button_info, &db->num_buttons);

	db->axis_imt_id = -1;
	db->button_imt_id = -1;

	IN_SetDeviceEventData (devid, db);

	return;
in_connect_usage:
	Sys_Printf ("in_connect bindname device_id [fullid]\n");
	Sys_Printf ("   Create a new device binding connection.\n");
	Sys_Printf ("   bindname: Connection name used for binding inputs\n.");
	Sys_Printf ("   device_id: Specify the device to be connected.\n");
	Sys_Printf ("      May be the numeric device number (#N), the device\n");
	Sys_Printf ("      name or device id as shown by in_devices.\n");
	Sys_Printf ("   fullid: if present, both device name and device id\n");
	Sys_Printf ("      will be used when automatically reconnecting the\n");
	Sys_Printf ("      device.\n");
}

static void
in_connections_f (void)
{
	for (in_devbindings_t *db = devbindings_list; db; db = db->next) {
		if (db->match_id) {
			Sys_Printf ("%s: %s %s\n", db->name, db->devname, db->id);
		} else {
			Sys_Printf ("%s: %s\n", db->name, db->devname);
		}
		if (db->devid > -1) {
			Sys_Printf ("    connected\n");
		} else {
			Sys_Printf ("    disconnected\n");
		}
	}
}

static void
keyhelp_f (void)
{
	keyhelp_axis_threshold = 3;
	if (Cmd_Argc () > 1) {
		char       *end;
		int         threshold = strtol (Cmd_Argv (1), &end, 0);
		if (!*end && threshold > 0) {
			keyhelp_axis_threshold = threshold;
		}
	}
	in_keyhelp_saved_handler = IE_Get_Focus ();
	IE_Set_Focus (in_keyhelp_handler);
	Sys_Printf ("Press button or move axis to identify\n");
}

typedef struct {
	const char *name;
	xcommand_t  func;
	const char *desc;
} bindcmd_t;

static bindcmd_t in_binding_commands[] = {
	{	"in_bind", in_bind_f,
		"Assign a command or a set of commands to a key.\n"
		"Note: To bind multiple commands to a key, enclose the "
		"commands in quotes and separate with semi-colons."
	},
	{	"in_unbind", in_unbind_f,
		"Remove the bind from the the selected key."
	},
	{	"in_clear", in_clear_f,
		"Remove all binds from the specified imts."
	},
	{	"in_devices", in_devices_f,
		"List the known devices and their status."
	},
	{	"in_connect", in_connect_f,
		"Create a device binding connection. Supports hot-plug: the "
		"device will be automatically reconnected when plugged in or "
		PACKAGE_NAME " is restarted."
	},
	{	"in_connections", in_connections_f,
		"List device bindings and statuses."
	},
	{	"keyhelp", keyhelp_f,
		"Identify the next active input axis or button.\n"
		"\n"
		"The identification includes the device binding name, axis or button "
		"number, and (if known) the name of the axis or button. Axes and "
		"buttons can always be bound by number, so even those for which a "
		"name is not known, but " PACKAGE_NAME " sees, can be bound."
	},
	{ }
#if 0
	{	"bindlist", Key_Bindlist_f,
		"list all of the key bindings"
	},
	{	"unbindall", Key_Unbindall_f,
		"Remove all binds (USE CAUTIOUSLY!!!"
	},
	{	"imt", Key_InputMappingTable_f,
		""
	},
	{	"imt_keydest", Key_IMT_Keydest_f,
		""
	},
	{	"in_type", Key_In_Type_f,
		"Send the given string as simulated key presses."
	},
#endif
};

void
IN_Binding_Activate (void)
{
	IE_Set_Focus (in_binding_handler);
}

static void
IN_Binding_Shutdown (void *data)
{
	Sys_MaskPrintf (SYS_input, "IN_Binding_Shutdown\n");
	for (in_devbindings_t *db = devbindings_list; db; db = db->next) {
		clear_connection (db);
	}
	for (unsigned i = 0; i < devbindings._size; i++) {
		free (devbindings._map[i]);
	}
	free (devbindings._map);
	DARRAY_CLEAR (&known_devices);
}

void
IN_Binding_Init (void)
{
	Sys_RegisterShutdown (IN_Binding_Shutdown, 0);
	in_binding_handler = IE_Add_Handler (in_binding_event_handler, 0);
	in_keyhelp_handler = IE_Add_Handler (in_keyhelp_event_handler, 0);

	for (bindcmd_t *cmd = in_binding_commands; cmd->name; cmd++) {
		Cmd_AddCommand (cmd->name, cmd->func, cmd->desc);
	}
}

void
IN_Binding_SaveConfig (plitem_t *config)
{
	plitem_t   *devices = PL_NewArray ();
	PL_D_AddObject (config, "devices", devices);
	for (in_devbindings_t *db = devbindings_list; db; db = db->next) {
		plitem_t   *db_cfg = PL_NewDictionary (0);
		PL_A_AddObject (devices, db_cfg);
		PL_D_AddObject (db_cfg, "name", PL_NewString (db->name));
		PL_D_AddObject (db_cfg, "devname", PL_NewString (db->devname));
		if (db->match_id) {
			PL_D_AddObject (db_cfg, "id", PL_NewString (db->id));
		}
		PL_D_AddObject (db_cfg, "num_axes",
						PL_NewString (va (0, "%d", db->num_axes)));
		PL_D_AddObject (db_cfg, "num_buttons",
						PL_NewString (va (0, "%d", db->num_buttons)));
		if (db->axis_imt_id >= 0) {
			plitem_t   *axes = PL_NewArray ();
			PL_D_AddObject (db_cfg, "axes", axes);
			for (int i = 0; i < db->num_axes; i++) {
				IMT_SaveAxisConfig (axes, db->axis_imt_id + i, i);
			}
		}
		if (db->button_imt_id >= 0) {
			plitem_t   *buttons = PL_NewArray ();
			PL_D_AddObject (db_cfg, "buttons", buttons);
			for (int i = 0; i < db->num_buttons; i++) {
				IMT_SaveButtonConfig (buttons, db->button_imt_id + i, i);
			}
		}
	}
}

static int
parse_num (plitem_t *item)
{
	char       *end;
	const char *str = PL_String (item);
	if (!str) {
		return -1;
	}
	int         num = strtol (str, &end, 0);
	if (*end || num < 0) {
		return -1;
	}
	return num;
}

static int
parse_int (plitem_t *item, int dflt)
{
	char       *end;
	const char *str = PL_String (item);
	if (!str) {
		return dflt;
	}
	int         num = strtol (str, &end, 0);
	if (*end) {
		return dflt;
	}
	return num;
}

static float
parse_float (plitem_t *item, float dflt)
{
	char       *end;
	const char *str = PL_String (item);
	if (!str) {
		return dflt;
	}
	float       num = strtof (str, &end);
	if (*end) {
		return dflt;
	}
	return num;
}

void
IN_Binding_LoadConfig (plitem_t *config)
{
	for (in_devbindings_t *db = devbindings_list; db; db = db->next) {
		clear_connection (db);
	}
	PR_RESRESET (devbindings);
	devbindings_list = 0;

	plitem_t   *devices = PL_ObjectForKey (config, "devices");
	if (PL_Type (devices) != QFArray) {
		Sys_Printf ("IN_Binding_LoadConfig: devices not an array\n");
		return;
	}
	for (int i = 0, count = PL_A_NumObjects (devices); i < count; i++) {
		plitem_t   *db_cfg = PL_ObjectAtIndex (devices, i);
		const char *bindname = PL_String (PL_ObjectForKey (db_cfg, "name"));
		const char *devname = PL_String (PL_ObjectForKey (db_cfg, "devname"));
		const char *id = PL_String (PL_ObjectForKey (db_cfg, "id"));
		int         num_axes = parse_num (PL_ObjectForKey (db_cfg,
														   "num_axes"));
		int         num_buttons = parse_num (PL_ObjectForKey (db_cfg,
															  "num_buttons"));
		if (in_binding_find_device (bindname)) {
			Sys_Printf ("%s already exists\n", bindname);
			continue;
		}
		if (num_axes < 0) {
			continue;
		}
		if (num_buttons < 0) {
			continue;
		}

		in_devbindings_t *db = PR_RESNEW (devbindings);
		db->next = devbindings_list;
		devbindings_list = db;

		db->name = strdup (bindname);
		db->devname = strdup (devname);
		if (id) {
			db->id = strdup (id);
			db->match_id = 1;
		} else {
			db->id = 0;
			db->match_id = 0;
		}
		db->devid = -1;		// not connected yet

		db->num_axes = num_axes;
		db->num_buttons = num_buttons;

		db->axis_imt_id = -1;
		db->button_imt_id = -1;

		plitem_t   *axes = PL_ObjectForKey (db_cfg, "axes");
		if (PL_A_NumObjects (axes)) {
			db->axis_imt_id = IMT_GetAxisBlock (db->num_axes);
		}
		for (int i = 0, count = PL_A_NumObjects (axes); i < count; i++) {
			plitem_t   *a = PL_ObjectAtIndex (axes, i);
			const char *imt_name = PL_String (PL_ObjectForKey (a, "imt"));
			int         num = parse_num (PL_ObjectForKey (a, "num"));
			const char *axis_name = PL_String (PL_ObjectForKey (a, "axis"));
			in_recipe_t recipe = {
				.min = parse_int (PL_ObjectForKey (a, "min"), 0),
				.max = parse_int (PL_ObjectForKey (a, "max"), 0),
				.minzone = parse_int (PL_ObjectForKey (a, "minzone"), 0),
				.maxzone = parse_int (PL_ObjectForKey (a, "maxzone"), 0),
				.deadzone = parse_int (PL_ObjectForKey (a, "deadzone"), 0),
				.curve = parse_float (PL_ObjectForKey (a, "curve"), 1),
				.scale = parse_float (PL_ObjectForKey (a, "scale"), 1),
			};
			if (!imt_name || num < 0 || num >= db->num_axes) {
				continue;
			}
			imt_t      *imt = IMT_FindIMT (imt_name);
			if (!imt) {
				continue;
			}
			in_axis_t  *axis = IN_FindAxis (axis_name);
			if (!axis) {
				continue;
			}
			IMT_BindAxis (imt, db->axis_imt_id + num, axis, &recipe);
		}
		plitem_t   *buttons = PL_ObjectForKey (db_cfg, "buttons");
		if (PL_A_NumObjects (buttons)) {
			db->button_imt_id = IMT_GetButtonBlock (db->num_buttons);
		}
		for (int i = 0, count = PL_A_NumObjects (buttons); i < count; i++) {
			plitem_t   *b = PL_ObjectAtIndex (buttons, i);
			const char *imt_name = PL_String (PL_ObjectForKey (b, "imt"));
			int         num = parse_num (PL_ObjectForKey (b, "num"));
			const char *binding = PL_String (PL_ObjectForKey (b, "binding"));
			if (!imt_name || num < 0 || num >= db->num_buttons) {
				continue;
			}
			imt_t      *imt = IMT_FindIMT (imt_name);
			if (!imt) {
				continue;
			}
			IMT_BindButton (imt, db->button_imt_id + num, binding);
		}
	}
	// force device connection events so any connected devices get hoocked up
	// with their bindings
	IN_SendConnectedDevices ();
}