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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************

    input.c

    Handle input from the user.

****************************************************************************

    To do:
        * auto-selecting joystick configs
        * per-joystick configs?
        * test half-axis selections
        * add input test menu
        * get rid of osd_customize_inputport_list

***************************************************************************/

#include "emu.h"
#include "emuopts.h"



//**************************************************************************
//  CONSTANTS
//**************************************************************************

// invalid memory value for axis polling
const INT32 INVALID_AXIS_VALUE      = 0x7fffffff;

// additional expanded input codes for sequences
const input_code input_seq::end_code(DEVICE_CLASS_INTERNAL, 0, ITEM_CLASS_INVALID, ITEM_MODIFIER_NONE, ITEM_ID_SEQ_END);
const input_code input_seq::default_code(DEVICE_CLASS_INTERNAL, 0, ITEM_CLASS_INVALID, ITEM_MODIFIER_NONE, ITEM_ID_SEQ_DEFAULT);
const input_code input_seq::not_code(DEVICE_CLASS_INTERNAL, 0, ITEM_CLASS_INVALID, ITEM_MODIFIER_NONE, ITEM_ID_SEQ_NOT);
const input_code input_seq::or_code(DEVICE_CLASS_INTERNAL, 0, ITEM_CLASS_INVALID, ITEM_MODIFIER_NONE, ITEM_ID_SEQ_OR);

// constant sequences
const input_seq input_seq::empty_seq;



//**************************************************************************
//  TYPE DEFINITIONS
//**************************************************************************

// ======================> input_device_switch_item

// derived input item representing a switch input
class input_device_switch_item : public input_device_item
{
public:
	// construction/destruction
	input_device_switch_item(input_device &device, const char *name, void *internal, input_item_id itemid, item_get_state_func getstate);

	// readers
	virtual INT32 read_as_switch(input_item_modifier modifier) override;
	virtual INT32 read_as_relative(input_item_modifier modifier) override;
	virtual INT32 read_as_absolute(input_item_modifier modifier) override;

	// steadykey helper
	bool steadykey_changed();
	void steadykey_update_to_current() { m_steadykey = m_current; }

private:
	// internal state
	INT32                   m_steadykey;            // the live steadykey state
	INT32                   m_oldkey;               // old live state
};


// ======================> input_device_switch_item

// derived input item representing a relative axis input
class input_device_relative_item : public input_device_item
{
public:
	// construction/destruction
	input_device_relative_item(input_device &device, const char *name, void *internal, input_item_id itemid, item_get_state_func getstate);

	// readers
	virtual INT32 read_as_switch(input_item_modifier modifier) override;
	virtual INT32 read_as_relative(input_item_modifier modifier) override;
	virtual INT32 read_as_absolute(input_item_modifier modifier) override;
};


// ======================> input_device_switch_item

// derived input item representing an absolute axis input
class input_device_absolute_item : public input_device_item
{
public:
	// construction/destruction
	input_device_absolute_item(input_device &device, const char *name, void *internal, input_item_id itemid, item_get_state_func getstate);

	// readers
	virtual INT32 read_as_switch(input_item_modifier modifier) override;
	virtual INT32 read_as_relative(input_item_modifier modifier) override;
	virtual INT32 read_as_absolute(input_item_modifier modifier) override;
};


// ======================> code_string_table

// simple class to match codes to strings
struct code_string_table
{
	UINT32 operator[](const char *string) const
	{
		for (const code_string_table *current = this; current->m_code != ~0; current++)
			if (strcmp(current->m_string, string) == 0)
				return current->m_code;
		return ~0;
	}

	const char *operator[](UINT32 code) const
	{
		for (const code_string_table *current = this; current->m_code != ~0; current++)
			if (current->m_code == code)
				return current->m_string;
		return nullptr;
	}

	UINT32                  m_code;
	const char *            m_string;
};



//**************************************************************************
//  TOKEN/STRING TABLES
//**************************************************************************

// token strings for device classes
static const code_string_table devclass_token_table[] =
{
	{ DEVICE_CLASS_KEYBOARD, "KEYCODE" },
	{ DEVICE_CLASS_MOUSE,    "MOUSECODE" },
	{ DEVICE_CLASS_LIGHTGUN, "GUNCODE" },
	{ DEVICE_CLASS_JOYSTICK, "JOYCODE" },
	{ ~0U,                   "UNKCODE" }
};

// friendly strings for device classes
static const code_string_table devclass_string_table[] =
{
	{ DEVICE_CLASS_KEYBOARD, "Kbd" },
	{ DEVICE_CLASS_MOUSE,    "Mouse" },
	{ DEVICE_CLASS_LIGHTGUN, "Gun" },
	{ DEVICE_CLASS_JOYSTICK, "Joy" },
	{ ~0U,                   "Unk" }
};

// token strings for item modifiers
static const code_string_table modifier_token_table[] =
{
	{ ITEM_MODIFIER_POS,     "POS" },
	{ ITEM_MODIFIER_NEG,     "NEG" },
	{ ITEM_MODIFIER_LEFT,    "LEFT" },
	{ ITEM_MODIFIER_RIGHT,   "RIGHT" },
	{ ITEM_MODIFIER_UP,      "UP" },
	{ ITEM_MODIFIER_DOWN,    "DOWN" },
	{ ~0U,                   "" }
};

// friendly strings for item modifiers
static const code_string_table modifier_string_table[] =
{
	{ ITEM_MODIFIER_POS,     "+" },
	{ ITEM_MODIFIER_NEG,     "-" },
	{ ITEM_MODIFIER_LEFT,    "Left" },
	{ ITEM_MODIFIER_RIGHT,   "Right" },
	{ ITEM_MODIFIER_UP,      "Up" },
	{ ITEM_MODIFIER_DOWN,    "Down" },
	{ ~0U,                   "" }
};

// token strings for item classes
static const code_string_table itemclass_token_table[] =
{
	{ ITEM_CLASS_SWITCH,     "SWITCH" },
	{ ITEM_CLASS_ABSOLUTE,   "ABSOLUTE" },
	{ ITEM_CLASS_RELATIVE,   "RELATIVE" },
	{ ~0U,                   "" }
};

// token strings for standard item ids
static const code_string_table itemid_token_table[] =
{
	// standard keyboard codes
	{ ITEM_ID_A,             "A" },
	{ ITEM_ID_B,             "B" },
	{ ITEM_ID_C,             "C" },
	{ ITEM_ID_D,             "D" },
	{ ITEM_ID_E,             "E" },
	{ ITEM_ID_F,             "F" },
	{ ITEM_ID_G,             "G" },
	{ ITEM_ID_H,             "H" },
	{ ITEM_ID_I,             "I" },
	{ ITEM_ID_J,             "J" },
	{ ITEM_ID_K,             "K" },
	{ ITEM_ID_L,             "L" },
	{ ITEM_ID_M,             "M" },
	{ ITEM_ID_N,             "N" },
	{ ITEM_ID_O,             "O" },
	{ ITEM_ID_P,             "P" },
	{ ITEM_ID_Q,             "Q" },
	{ ITEM_ID_R,             "R" },
	{ ITEM_ID_S,             "S" },
	{ ITEM_ID_T,             "T" },
	{ ITEM_ID_U,             "U" },
	{ ITEM_ID_V,             "V" },
	{ ITEM_ID_W,             "W" },
	{ ITEM_ID_X,             "X" },
	{ ITEM_ID_Y,             "Y" },
	{ ITEM_ID_Z,             "Z" },
	{ ITEM_ID_0,             "0" },
	{ ITEM_ID_1,             "1" },
	{ ITEM_ID_2,             "2" },
	{ ITEM_ID_3,             "3" },
	{ ITEM_ID_4,             "4" },
	{ ITEM_ID_5,             "5" },
	{ ITEM_ID_6,             "6" },
	{ ITEM_ID_7,             "7" },
	{ ITEM_ID_8,             "8" },
	{ ITEM_ID_9,             "9" },
	{ ITEM_ID_F1,            "F1" },
	{ ITEM_ID_F2,            "F2" },
	{ ITEM_ID_F3,            "F3" },
	{ ITEM_ID_F4,            "F4" },
	{ ITEM_ID_F5,            "F5" },
	{ ITEM_ID_F6,            "F6" },
	{ ITEM_ID_F7,            "F7" },
	{ ITEM_ID_F8,            "F8" },
	{ ITEM_ID_F9,            "F9" },
	{ ITEM_ID_F10,           "F10" },
	{ ITEM_ID_F11,           "F11" },
	{ ITEM_ID_F12,           "F12" },
	{ ITEM_ID_F13,           "F13" },
	{ ITEM_ID_F14,           "F14" },
	{ ITEM_ID_F15,           "F15" },
	{ ITEM_ID_ESC,           "ESC" },
	{ ITEM_ID_TILDE,         "TILDE" },
	{ ITEM_ID_MINUS,         "MINUS" },
	{ ITEM_ID_EQUALS,        "EQUALS" },
	{ ITEM_ID_BACKSPACE,     "BACKSPACE" },
	{ ITEM_ID_TAB,           "TAB" },
	{ ITEM_ID_OPENBRACE,     "OPENBRACE" },
	{ ITEM_ID_CLOSEBRACE,    "CLOSEBRACE" },
	{ ITEM_ID_ENTER,         "ENTER" },
	{ ITEM_ID_COLON,         "COLON" },
	{ ITEM_ID_QUOTE,         "QUOTE" },
	{ ITEM_ID_BACKSLASH,     "BACKSLASH" },
	{ ITEM_ID_BACKSLASH2,    "BACKSLASH2" },
	{ ITEM_ID_COMMA,         "COMMA" },
	{ ITEM_ID_STOP,          "STOP" },
	{ ITEM_ID_SLASH,         "SLASH" },
	{ ITEM_ID_SPACE,         "SPACE" },
	{ ITEM_ID_INSERT,        "INSERT" },
	{ ITEM_ID_DEL,           "DEL" },
	{ ITEM_ID_HOME,          "HOME" },
	{ ITEM_ID_END,           "END" },
	{ ITEM_ID_PGUP,          "PGUP" },
	{ ITEM_ID_PGDN,          "PGDN" },
	{ ITEM_ID_LEFT,          "LEFT" },
	{ ITEM_ID_RIGHT,         "RIGHT" },
	{ ITEM_ID_UP,            "UP" },
	{ ITEM_ID_DOWN,          "DOWN" },
	{ ITEM_ID_0_PAD,         "0PAD" },
	{ ITEM_ID_1_PAD,         "1PAD" },
	{ ITEM_ID_2_PAD,         "2PAD" },
	{ ITEM_ID_3_PAD,         "3PAD" },
	{ ITEM_ID_4_PAD,         "4PAD" },
	{ ITEM_ID_5_PAD,         "5PAD" },
	{ ITEM_ID_6_PAD,         "6PAD" },
	{ ITEM_ID_7_PAD,         "7PAD" },
	{ ITEM_ID_8_PAD,         "8PAD" },
	{ ITEM_ID_9_PAD,         "9PAD" },
	{ ITEM_ID_SLASH_PAD,     "SLASHPAD" },
	{ ITEM_ID_ASTERISK,      "ASTERISK" },
	{ ITEM_ID_MINUS_PAD,     "MINUSPAD" },
	{ ITEM_ID_PLUS_PAD,      "PLUSPAD" },
	{ ITEM_ID_DEL_PAD,       "DELPAD" },
	{ ITEM_ID_ENTER_PAD,     "ENTERPAD" },
	{ ITEM_ID_PRTSCR,        "PRTSCR" },
	{ ITEM_ID_PAUSE,         "PAUSE" },
	{ ITEM_ID_LSHIFT,        "LSHIFT" },
	{ ITEM_ID_RSHIFT,        "RSHIFT" },
	{ ITEM_ID_LCONTROL,      "LCONTROL" },
	{ ITEM_ID_RCONTROL,      "RCONTROL" },
	{ ITEM_ID_LALT,          "LALT" },
	{ ITEM_ID_RALT,          "RALT" },
	{ ITEM_ID_SCRLOCK,       "SCRLOCK" },
	{ ITEM_ID_NUMLOCK,       "NUMLOCK" },
	{ ITEM_ID_CAPSLOCK,      "CAPSLOCK" },
	{ ITEM_ID_LWIN,          "LWIN" },
	{ ITEM_ID_RWIN,          "RWIN" },
	{ ITEM_ID_MENU,          "MENU" },
	{ ITEM_ID_CANCEL,        "CANCEL" },

	// standard mouse/joystick/gun codes
	{ ITEM_ID_XAXIS,         "XAXIS" },
	{ ITEM_ID_YAXIS,         "YAXIS" },
	{ ITEM_ID_ZAXIS,         "ZAXIS" },
	{ ITEM_ID_RXAXIS,        "RXAXIS" },
	{ ITEM_ID_RYAXIS,        "RYAXIS" },
	{ ITEM_ID_RZAXIS,        "RZAXIS" },
	{ ITEM_ID_SLIDER1,       "SLIDER1" },
	{ ITEM_ID_SLIDER2,       "SLIDER2" },
	{ ITEM_ID_BUTTON1,       "BUTTON1" },
	{ ITEM_ID_BUTTON2,       "BUTTON2" },
	{ ITEM_ID_BUTTON3,       "BUTTON3" },
	{ ITEM_ID_BUTTON4,       "BUTTON4" },
	{ ITEM_ID_BUTTON5,       "BUTTON5" },
	{ ITEM_ID_BUTTON6,       "BUTTON6" },
	{ ITEM_ID_BUTTON7,       "BUTTON7" },
	{ ITEM_ID_BUTTON8,       "BUTTON8" },
	{ ITEM_ID_BUTTON9,       "BUTTON9" },
	{ ITEM_ID_BUTTON10,      "BUTTON10" },
	{ ITEM_ID_BUTTON11,      "BUTTON11" },
	{ ITEM_ID_BUTTON12,      "BUTTON12" },
	{ ITEM_ID_BUTTON13,      "BUTTON13" },
	{ ITEM_ID_BUTTON14,      "BUTTON14" },
	{ ITEM_ID_BUTTON15,      "BUTTON15" },
	{ ITEM_ID_BUTTON16,      "BUTTON16" },
	{ ITEM_ID_BUTTON17,      "BUTTON17" },
	{ ITEM_ID_BUTTON18,      "BUTTON18" },
	{ ITEM_ID_BUTTON19,      "BUTTON19" },
	{ ITEM_ID_BUTTON20,      "BUTTON20" },
	{ ITEM_ID_BUTTON21,      "BUTTON21" },
	{ ITEM_ID_BUTTON22,      "BUTTON22" },
	{ ITEM_ID_BUTTON23,      "BUTTON23" },
	{ ITEM_ID_BUTTON24,      "BUTTON24" },
	{ ITEM_ID_BUTTON25,      "BUTTON25" },
	{ ITEM_ID_BUTTON26,      "BUTTON26" },
	{ ITEM_ID_BUTTON27,      "BUTTON27" },
	{ ITEM_ID_BUTTON28,      "BUTTON28" },
	{ ITEM_ID_BUTTON29,      "BUTTON29" },
	{ ITEM_ID_BUTTON30,      "BUTTON30" },
	{ ITEM_ID_BUTTON31,      "BUTTON31" },
	{ ITEM_ID_BUTTON32,      "BUTTON32" },
	{ ITEM_ID_START,         "START" },
	{ ITEM_ID_SELECT,        "SELECT" },

	// Hats
	{ ITEM_ID_HAT1UP,        "HAT1UP" },
	{ ITEM_ID_HAT1DOWN,      "HAT1DOWN" },
	{ ITEM_ID_HAT1LEFT,      "HAT1LEFT" },
	{ ITEM_ID_HAT1RIGHT,     "HAT1RIGHT" },
	{ ITEM_ID_HAT2UP,        "HAT2UP" },
	{ ITEM_ID_HAT2DOWN,      "HAT2DOWN" },
	{ ITEM_ID_HAT2LEFT,      "HAT2LEFT" },
	{ ITEM_ID_HAT2RIGHT,     "HAT2RIGHT" },
	{ ITEM_ID_HAT3UP,        "HAT3UP" },
	{ ITEM_ID_HAT3DOWN,      "HAT3DOWN" },
	{ ITEM_ID_HAT3LEFT,      "HAT3LEFT" },
	{ ITEM_ID_HAT3RIGHT,     "HAT3RIGHT" },
	{ ITEM_ID_HAT4UP,        "HAT4UP" },
	{ ITEM_ID_HAT4DOWN,      "HAT4DOWN" },
	{ ITEM_ID_HAT4LEFT,      "HAT4LEFT" },
	{ ITEM_ID_HAT4RIGHT,     "HAT4RIGHT" },

	// Additional IDs
	{ ITEM_ID_ADD_SWITCH1,   "ADDSW1" },
	{ ITEM_ID_ADD_SWITCH2,   "ADDSW2" },
	{ ITEM_ID_ADD_SWITCH3,   "ADDSW3" },
	{ ITEM_ID_ADD_SWITCH4,   "ADDSW4" },
	{ ITEM_ID_ADD_SWITCH5,   "ADDSW5" },
	{ ITEM_ID_ADD_SWITCH6,   "ADDSW6" },
	{ ITEM_ID_ADD_SWITCH7,   "ADDSW7" },
	{ ITEM_ID_ADD_SWITCH8,   "ADDSW8" },
	{ ITEM_ID_ADD_SWITCH9,   "ADDSW9" },
	{ ITEM_ID_ADD_SWITCH10,  "ADDSW10" },
	{ ITEM_ID_ADD_SWITCH11,  "ADDSW11" },
	{ ITEM_ID_ADD_SWITCH12,  "ADDSW12" },
	{ ITEM_ID_ADD_SWITCH13,  "ADDSW13" },
	{ ITEM_ID_ADD_SWITCH14,  "ADDSW14" },
	{ ITEM_ID_ADD_SWITCH15,  "ADDSW15" },
	{ ITEM_ID_ADD_SWITCH16,  "ADDSW16" },
	{ ITEM_ID_ADD_ABSOLUTE1, "ADDAXIS1" },
	{ ITEM_ID_ADD_ABSOLUTE2, "ADDAXIS2" },
	{ ITEM_ID_ADD_ABSOLUTE3, "ADDAXIS3" },
	{ ITEM_ID_ADD_ABSOLUTE4, "ADDAXIS4" },
	{ ITEM_ID_ADD_ABSOLUTE5, "ADDAXIS5" },
	{ ITEM_ID_ADD_ABSOLUTE6, "ADDAXIS6" },
	{ ITEM_ID_ADD_ABSOLUTE7, "ADDAXIS7" },
	{ ITEM_ID_ADD_ABSOLUTE8, "ADDAXIS8" },
	{ ITEM_ID_ADD_ABSOLUTE9, "ADDAXIS9" },
	{ ITEM_ID_ADD_ABSOLUTE10,"ADDAXIS10" },
	{ ITEM_ID_ADD_ABSOLUTE11,"ADDAXIS11" },
	{ ITEM_ID_ADD_ABSOLUTE12,"ADDAXIS12" },
	{ ITEM_ID_ADD_ABSOLUTE13,"ADDAXIS13" },
	{ ITEM_ID_ADD_ABSOLUTE14,"ADDAXIS14" },
	{ ITEM_ID_ADD_ABSOLUTE15,"ADDAXIS15" },
	{ ITEM_ID_ADD_ABSOLUTE16,"ADDAXIS16" },
	{ ITEM_ID_ADD_RELATIVE1, "ADDREL1" },
	{ ITEM_ID_ADD_RELATIVE2, "ADDREL2" },
	{ ITEM_ID_ADD_RELATIVE3, "ADDREL3" },
	{ ITEM_ID_ADD_RELATIVE4, "ADDREL4" },
	{ ITEM_ID_ADD_RELATIVE5, "ADDREL5" },
	{ ITEM_ID_ADD_RELATIVE6, "ADDREL6" },
	{ ITEM_ID_ADD_RELATIVE7, "ADDREL7" },
	{ ITEM_ID_ADD_RELATIVE8, "ADDREL8" },
	{ ITEM_ID_ADD_RELATIVE9, "ADDREL9" },
	{ ITEM_ID_ADD_RELATIVE10,"ADDREL10" },
	{ ITEM_ID_ADD_RELATIVE11,"ADDREL11" },
	{ ITEM_ID_ADD_RELATIVE12,"ADDREL12" },
	{ ITEM_ID_ADD_RELATIVE13,"ADDREL13" },
	{ ITEM_ID_ADD_RELATIVE14,"ADDREL14" },
	{ ITEM_ID_ADD_RELATIVE15,"ADDREL15" },
	{ ITEM_ID_ADD_RELATIVE16,"ADDREL16" },

	{ ~0U,                   nullptr }
};



//**************************************************************************
//  GLOBAL VARIABLES
//**************************************************************************

// standard joystick mappings
const char          joystick_map_8way[] = "7778...4445";
const char          joystick_map_4way_diagonal[] = "4444s8888..444458888.444555888.ss5.222555666.222256666.2222s6666.2222s6666";
// const char          joystick_map_4way_sticky[] = "s8.4s8.44s8.4445";


//**************************************************************************
//  JOYSTICK MAP
//**************************************************************************

//-------------------------------------------------
//  joystick_map - constructor
//-------------------------------------------------

joystick_map::joystick_map()
	: m_lastmap(JOYSTICK_MAP_NEUTRAL)
{
	// parse the standard 8-way map as default
	parse(joystick_map_8way);
}


//-------------------------------------------------
//  parse - parse a string into a joystick map
//-------------------------------------------------

bool joystick_map::parse(const char *mapstring)
{
	// save a copy of the original string
	m_origstring = mapstring;

	// iterate over rows
	for (int rownum = 0; rownum < 9; rownum++)
	{
		// if we're done, copy from another row
		if (*mapstring == 0 || *mapstring == '.')
		{
			bool symmetric = (rownum >= 5 && *mapstring == 0);
			const UINT8 *srcrow = &m_map[symmetric ? (8 - rownum) : (rownum - 1)][0];

			// if this is row 0, we don't have a source row -- invalid
			if (rownum == 0)
				return false;

			// copy from the srcrow, applying up/down symmetry if in the bottom half
			for (int colnum = 0; colnum < 9; colnum++)
			{
				UINT8 val = srcrow[colnum];
				if (symmetric)
					val = (val & (JOYSTICK_MAP_LEFT | JOYSTICK_MAP_RIGHT)) | ((val & JOYSTICK_MAP_UP) << 1) | ((val & JOYSTICK_MAP_DOWN) >> 1);
				m_map[rownum][colnum] = val;
			}
		}

		// otherwise, parse this column
		else
		{
			for (int colnum = 0; colnum < 9; colnum++)
			{
				// if we're at the end of row, copy previous to the middle, then apply left/right symmetry
				if (colnum > 0 && (*mapstring == 0 || *mapstring == '.'))
				{
					bool symmetric = (colnum >= 5);
					UINT8 val = m_map[rownum][symmetric ? (8 - colnum) : (colnum - 1)];
					if (symmetric)
						val = (val & (JOYSTICK_MAP_UP | JOYSTICK_MAP_DOWN)) | ((val & JOYSTICK_MAP_LEFT) << 1) | ((val & JOYSTICK_MAP_RIGHT) >> 1);
					m_map[rownum][colnum] = val;
				}

				// otherwise, convert the character to its value
				else
				{
					static const UINT8 charmap[] =
					{
						JOYSTICK_MAP_UP | JOYSTICK_MAP_LEFT,
						JOYSTICK_MAP_UP,
						JOYSTICK_MAP_UP | JOYSTICK_MAP_RIGHT,
						JOYSTICK_MAP_LEFT,
						JOYSTICK_MAP_NEUTRAL,
						JOYSTICK_MAP_RIGHT,
						JOYSTICK_MAP_DOWN | JOYSTICK_MAP_LEFT,
						JOYSTICK_MAP_DOWN,
						JOYSTICK_MAP_DOWN | JOYSTICK_MAP_RIGHT,
						JOYSTICK_MAP_STICKY
					};
					static const char validchars[] = "789456123s";
					const char *ptr = strchr(validchars, *mapstring++);

					// invalid characters exit immediately
					if (ptr == nullptr)
						return false;
					m_map[rownum][colnum] = charmap[ptr - validchars];
				}
			}
		}

		// if we ended with a period, advance to the next row
		if (*mapstring == '.')
			mapstring++;
	}
	return true;
}


//-------------------------------------------------
//  to_string - output the map as a string for
//  friendly display
//-------------------------------------------------

const char *joystick_map::to_string(std::string &str) const
{
	strprintf(str, "%s\n", m_origstring.c_str());
	for (auto & elem : m_map)
	{
		str.append("  ");
		for (int colnum = 0; colnum < 9; colnum++)
			switch (elem[colnum])
			{
				case JOYSTICK_MAP_UP | JOYSTICK_MAP_LEFT:   str.append("7");  break;
				case JOYSTICK_MAP_UP:                       str.append("8");  break;
				case JOYSTICK_MAP_UP | JOYSTICK_MAP_RIGHT:  str.append("9");  break;
				case JOYSTICK_MAP_LEFT:                     str.append("4");  break;
				case JOYSTICK_MAP_NEUTRAL:                  str.append("5");  break;
				case JOYSTICK_MAP_RIGHT:                    str.append("6");  break;
				case JOYSTICK_MAP_DOWN | JOYSTICK_MAP_LEFT: str.append("1");  break;
				case JOYSTICK_MAP_DOWN:                     str.append("2");  break;
				case JOYSTICK_MAP_DOWN | JOYSTICK_MAP_RIGHT:str.append("3");  break;
				case JOYSTICK_MAP_STICKY:                   str.append("s");  break;
				default:                                    str.append("?");  break;
			}

		str.append("\n");
	}
	return str.c_str();
}


//-------------------------------------------------
//  update - update the state of the joystick
//  map based on the given X/Y axis values
//-------------------------------------------------

UINT8 joystick_map::update(INT32 xaxisval, INT32 yaxisval)
{
	// now map the X and Y axes to a 9x9 grid using the raw values
	xaxisval = ((xaxisval - INPUT_ABSOLUTE_MIN) * 9) / (INPUT_ABSOLUTE_MAX - INPUT_ABSOLUTE_MIN + 1);
	yaxisval = ((yaxisval - INPUT_ABSOLUTE_MIN) * 9) / (INPUT_ABSOLUTE_MAX - INPUT_ABSOLUTE_MIN + 1);
	UINT8 mapval = m_map[yaxisval][xaxisval];

	// handle stickiness
	if (mapval == JOYSTICK_MAP_STICKY)
		mapval = m_lastmap;
	else
		m_lastmap = mapval;

	// return based on whether the appropriate bit is set
	return mapval;
}



//**************************************************************************
//  INPUT CODE
//**************************************************************************

//-------------------------------------------------
//  input_code - construct an input code from a
//  device/item pair
//-------------------------------------------------

input_code::input_code(input_device &device, input_item_id itemid)
{
	assert(itemid < ITEM_ID_ABSOLUTE_MAXIMUM);
	input_device_item *item = device.item(itemid);
	assert(item != nullptr);
	m_internal = ((device.devclass() & 0xf) << 28) | ((device.devindex() & 0xff) << 20) | ((item->itemclass() & 0xf) << 16) | (ITEM_MODIFIER_NONE << 12) | (item->itemid() & 0xfff);
}



//**************************************************************************
//  INPUT SEQ
//**************************************************************************

//-------------------------------------------------
//  operator+= - append a code to the end of an
//  input sequence
//-------------------------------------------------

input_seq &input_seq::operator+=(input_code code)
{
	// if not enough room, return FALSE
	int curlength = length();
	if (curlength < ARRAY_LENGTH(m_code) - 1)
	{
		m_code[curlength++] = code;
		m_code[curlength] = end_code;
	}
	return *this;
}


//-------------------------------------------------
//  operator|= - append a code to a sequence; if
//  the sequence is non-empty, insert an OR
//  before the new code
//-------------------------------------------------

input_seq &input_seq::operator|=(input_code code)
{
	// overwrite end/default with the new code
	if (m_code[0] == end_code || m_code[0] == default_code)
		m_code[0] = code;

	// otherwise, append an OR token and then the new code
	else
	{
		*this += or_code;
		*this += code;
	}
	return *this;
}


//-------------------------------------------------
//  length - return the length of the sequence
//-------------------------------------------------

int input_seq::length() const
{
	// find the end token; error if none found
	for (int seqnum = 0; seqnum < ARRAY_LENGTH(m_code); seqnum++)
		if (m_code[seqnum] == end_code)
			return seqnum;
	return ARRAY_LENGTH(m_code);
}


//-------------------------------------------------
//  is_valid - return true if a given sequence is
//  valid
//-------------------------------------------------

bool input_seq::is_valid() const
{
	// "default" can only be of length 1
	if (m_code[0] == default_code)
		return (length() == 1);

	// scan the sequence for valid codes
	input_item_class lastclass = ITEM_CLASS_INVALID;
	input_code lastcode = INPUT_CODE_INVALID;
	int positive_code_count = 0;
	for (auto code : m_code)
	{
		// invalid codes are never permitted
		
		if (code == INPUT_CODE_INVALID)
			return false;

		// if we hit an OR or the end, validate the previous chunk
		if (code == or_code || code == end_code)
		{
			// must be at least one positive code
			if (positive_code_count == 0)
				return false;

			// last code must not have been an internal code
			if (lastcode.internal())
				return false;

			// if this is the end, we're ok
			if (code == end_code)
				return true;

			// reset the state for the next chunk
			positive_code_count = 0;
			lastclass = ITEM_CLASS_INVALID;
		}

		// if we hit a NOT, make sure we don't have a double
		else if (code == not_code)
		{
			if (lastcode == not_code)
				return false;
		}

		// anything else
		else
		{
			// count positive codes
			if (lastcode != not_code)
				positive_code_count++;

			// non-switch items can't have a NOT
			input_item_class itemclass = code.item_class();
			if (itemclass != ITEM_CLASS_SWITCH && lastcode == not_code)
				return FALSE;

			// absolute/relative items must all be the same class
			if ((lastclass == ITEM_CLASS_ABSOLUTE && itemclass != ITEM_CLASS_ABSOLUTE) ||
				(lastclass == ITEM_CLASS_RELATIVE && itemclass != ITEM_CLASS_RELATIVE))
				return false;
		}

		// remember the last code
		lastcode = code;
	}

	// if we got here, we were missing an END token; fail
	return false;
}


//-------------------------------------------------
//  set - directly set up to the first 7 codes
//-------------------------------------------------

void input_seq::set(input_code code0, input_code code1, input_code code2, input_code code3, input_code code4, input_code code5, input_code code6)
{
	m_code[0] = code0;
	m_code[1] = code1;
	m_code[2] = code2;
	m_code[3] = code3;
	m_code[4] = code4;
	m_code[5] = code5;
	m_code[6] = code6;
	for (int codenum = 7; codenum < ARRAY_LENGTH(m_code); codenum++)
		m_code[codenum] = end_code;
}


//-------------------------------------------------
//  backspace - "backspace" over the last entry in
//  a sequence
//-------------------------------------------------

void input_seq::backspace()
{
	// if we have at least one entry, remove it
	int curlength = length();
	if (curlength > 0)
		m_code[curlength - 1] = end_code;
}


//-------------------------------------------------
//  replace - replace all instances of oldcode
//  with newcode in a sequence
//-------------------------------------------------

void input_seq::replace(input_code oldcode, input_code newcode)
{
	for (auto & elem : m_code)
		if (elem == oldcode)
			elem = newcode;
}



//**************************************************************************
//  INPUT DEVICE
//**************************************************************************

//-------------------------------------------------
//  input_device - constructor
//-------------------------------------------------

input_device::input_device(input_class &_class, int devindex, const char *name, void *internal)
	: m_class(_class),
		m_name(name),
		m_devindex(devindex),
		m_maxitem(input_item_id(0)),
		m_internal(internal),
		m_joystick_deadzone((INT32)(_class.manager().machine().options().joystick_deadzone() * INPUT_ABSOLUTE_MAX)),
		m_joystick_saturation((INT32)(_class.manager().machine().options().joystick_saturation() * INPUT_ABSOLUTE_MAX)),
		m_steadykey_enabled(_class.manager().machine().options().steadykey()),
		m_lightgun_reload_button(_class.manager().machine().options().offscreen_reload())
{
	// additional work for joysticks
	if (devclass() == DEVICE_CLASS_JOYSTICK)
	{
		// get the default joystick map
		const char *mapstring = machine().options().joystick_map();
		if (mapstring[0] == 0 || strcmp(mapstring, "auto") == 0)
			mapstring = joystick_map_8way;

		// parse it
		std::string tempstr;
		if (!m_joymap.parse(mapstring))
		{
			osd_printf_error("Invalid joystick map: %s\n", mapstring);
			m_joymap.parse(joystick_map_8way);
		}
		else if (mapstring != joystick_map_8way)
			osd_printf_verbose("Input: Default joystick map = %s\n", m_joymap.to_string(tempstr));
	}
}


//-------------------------------------------------
//  add_item - add a new item to an input device
//-------------------------------------------------

input_item_id input_device::add_item(const char *name, input_item_id itemid, item_get_state_func getstate, void *internal)
{
	assert_always(machine().phase() == MACHINE_PHASE_INIT, "Can only call input_device::add_item at init time!");
	assert(name != nullptr);
	assert(itemid > ITEM_ID_INVALID && itemid < ITEM_ID_MAXIMUM);
	assert(getstate != nullptr);

	// if we have a generic ID, pick a new internal one
	input_item_id originalid = itemid;
	if (itemid >= ITEM_ID_OTHER_SWITCH && itemid <= ITEM_ID_OTHER_AXIS_RELATIVE)
		for (itemid = (input_item_id)(ITEM_ID_MAXIMUM + 1); itemid <= ITEM_ID_ABSOLUTE_MAXIMUM; ++itemid)
			if (m_item[itemid] == nullptr)
				break;
	assert(itemid <= ITEM_ID_ABSOLUTE_MAXIMUM);

	// make sure we don't have any overlap
	assert(m_item[itemid] == nullptr);

	// determine the class and create the appropriate item class
	switch (m_class.standard_item_class(originalid))
	{
		case ITEM_CLASS_SWITCH:
			m_item[itemid] = std::make_unique<input_device_switch_item>(*this, name, internal, itemid, getstate);
			break;

		case ITEM_CLASS_RELATIVE:
			m_item[itemid] = std::make_unique<input_device_relative_item>(*this, name, internal, itemid, getstate);
			break;

		case ITEM_CLASS_ABSOLUTE:
			m_item[itemid] = std::make_unique<input_device_absolute_item>(*this, name, internal, itemid, getstate);
			break;

		default:
			m_item[itemid] = nullptr;
			assert(false);
	}

	// assign the new slot and update the maximum
	m_maxitem = MAX(m_maxitem, itemid);
	return itemid;
}


//-------------------------------------------------
//  apply_deadzone_and_saturation - apply global
//  deadzone and saturation parameters to an
//  absolute value
//-------------------------------------------------

INT32 input_device::apply_deadzone_and_saturation(INT32 result) const
{
	// ignore for non-joysticks
	if (devclass() != DEVICE_CLASS_JOYSTICK)
		return result;

	// properties are symmetric
	bool negative = false;
	if (result < 0)
	{
		negative = true;
		result = -result;
	}

	// if in the deadzone, return 0
	if (result < m_joystick_deadzone)
		result = 0;

	// if saturated, return the max
	else if (result > m_joystick_saturation)
		result = INPUT_ABSOLUTE_MAX;

	// otherwise, scale
	else
		result = (INT64)(result - m_joystick_deadzone) * (INT64)INPUT_ABSOLUTE_MAX / (INT64)(m_joystick_saturation - m_joystick_deadzone);

	// re-apply sign and return
	return negative ? -result : result;
}


//-------------------------------------------------
//  apply_steadykey - apply steadykey option if
//  enabled
//-------------------------------------------------

void input_device::apply_steadykey() const
{
	// ignore if not enabled
	if (!m_steadykey_enabled)
		return;

	// update the state of all the keys and see if any changed state
	bool anything_changed = false;
	for (input_item_id itemid = ITEM_ID_FIRST_VALID; itemid <= m_maxitem; ++itemid)
	{
		input_device_item *item = m_item[itemid].get();
		if (item != nullptr && item->itemclass() == ITEM_CLASS_SWITCH)
			if (downcast<input_device_switch_item *>(item)->steadykey_changed())
				anything_changed = true;
	}

	// if the keyboard state is stable, flush the current state
	if (!anything_changed)
		for (input_item_id itemid = ITEM_ID_FIRST_VALID; itemid <= m_maxitem; ++itemid)
		{
			input_device_item *item = m_item[itemid].get();
			if (item != nullptr && item->itemclass() == ITEM_CLASS_SWITCH)
				downcast<input_device_switch_item *>(item)->steadykey_update_to_current();
		}
}



//**************************************************************************
//  INPUT CLASS
//**************************************************************************

//-------------------------------------------------
//  input_class - constructor
//-------------------------------------------------

input_class::input_class(input_manager &manager, input_device_class devclass, bool enabled, bool multi)
	: m_manager(manager),
		m_devclass(devclass),
		m_maxindex(0),
		m_enabled(enabled),
		m_multi(multi)
{
	// request a per-frame callback for the keyboard class
	if (devclass == DEVICE_CLASS_KEYBOARD)
		machine().add_notifier(MACHINE_NOTIFY_FRAME, machine_notify_delegate(FUNC(input_class::frame_callback), this));
}


//-------------------------------------------------
//  add_device - add a new input device
//-------------------------------------------------

input_device *input_class::add_device(const char *name, void *internal)
{
	// find the next empty index
	int devindex;
	for (devindex = 0; devindex < DEVICE_INDEX_MAXIMUM; devindex++)
		if (m_device[devindex] == nullptr)
			break;

	// call through
	return add_device(devindex, name, internal);
}

input_device *input_class::add_device(int devindex, const char *name, void *internal)
{
	assert_always(machine().phase() == MACHINE_PHASE_INIT, "Can only call input_class::add_device at init time!");
	assert(name != nullptr);
	assert(devindex >= 0 && devindex < DEVICE_INDEX_MAXIMUM);
	assert(m_device[devindex] == nullptr);

	// allocate a new device
	m_device[devindex] = std::make_unique<input_device>(*this, devindex, name, internal);

	// update the maximum index found
	m_maxindex = MAX(m_maxindex, devindex);

	osd_printf_verbose("Input: Adding %s #%d: %s\n", (*devclass_string_table)[m_devclass], devindex, name);
	return m_device[devindex].get();
}


//-------------------------------------------------
//  standard_item_class - return the class of a
//  standard item
//-------------------------------------------------

input_item_class input_class::standard_item_class(input_item_id itemid)
{
	// most everything standard is a switch, apart from the axes
	if (itemid == ITEM_ID_OTHER_SWITCH || itemid < ITEM_ID_XAXIS || (itemid > ITEM_ID_SLIDER2 && itemid < ITEM_ID_ADD_ABSOLUTE1))
		return ITEM_CLASS_SWITCH;

	// standard mouse axes are relative
	else if (m_devclass == DEVICE_CLASS_MOUSE || itemid == ITEM_ID_OTHER_AXIS_RELATIVE || (itemid >= ITEM_ID_ADD_RELATIVE1 && itemid <= ITEM_ID_ADD_RELATIVE16))
		return ITEM_CLASS_RELATIVE;

	// all other standard axes are absolute
	else
		return ITEM_CLASS_ABSOLUTE;
}


//-------------------------------------------------
//  frame_callback - per-frame callback for various
//  bookkeeping
//-------------------------------------------------

void input_class::frame_callback()
{
	// iterate over all devices in our class
	for (int devnum = 0; devnum <= m_maxindex; devnum++)
		if (m_device[devnum] != nullptr)
			m_device[devnum]->apply_steadykey();
}



//**************************************************************************
//  INPUT MANAGER
//**************************************************************************

//-------------------------------------------------
//  input_manager - constructor
//-------------------------------------------------

input_manager::input_manager(running_machine &machine)
	: m_machine(machine),
		m_keyboard_class(*this, DEVICE_CLASS_KEYBOARD, true, machine.options().multi_keyboard()),
		m_mouse_class(*this, DEVICE_CLASS_MOUSE, machine.options().mouse(), machine.options().multi_mouse()),
		m_joystick_class(*this, DEVICE_CLASS_JOYSTICK, machine.options().joystick(), true),
		m_lightgun_class(*this, DEVICE_CLASS_LIGHTGUN, machine.options().lightgun(), true),
		m_poll_seq_last_ticks(0),
		m_poll_seq_class(ITEM_CLASS_SWITCH)
{
	// reset code memory
	reset_memory();

	// create pointers for the classes
	memset(m_class, 0, sizeof(m_class));
	m_class[DEVICE_CLASS_KEYBOARD] = &m_keyboard_class;
	m_class[DEVICE_CLASS_MOUSE] = &m_mouse_class;
	m_class[DEVICE_CLASS_JOYSTICK] = &m_joystick_class;
	m_class[DEVICE_CLASS_LIGHTGUN] = &m_lightgun_class;
}


//-------------------------------------------------
//  code_value - return the value of a given
//  input code
//-------------------------------------------------

INT32 input_manager::code_value(input_code code)
{
	g_profiler.start(PROFILER_INPUT);
	INT32 result = 0;

	// dummy loop to allow clean early exits
	do
	{
		// return 0 for any invalid devices
		input_device *device = device_from_code(code);
		if (device == nullptr)
			break;

		// also return 0 if the device class is disabled
		input_class &devclass = *m_class[code.device_class()];
		if (!devclass.enabled())
			break;

		// if this is not a multi device, only return data for item 0 and iterate over all
		int startindex = code.device_index();
		int stopindex = startindex;
		if (!devclass.multi())
		{
			if (startindex != 0)
				break;
			stopindex = devclass.maxindex();
		}

		// iterate over all device indices
		input_item_class targetclass = code.item_class();
		for (int curindex = startindex; curindex <= stopindex; curindex++)
		{
			// lookup the item for the appropriate index
			code.set_device_index(curindex);
			input_device_item *item = item_from_code(code);
			if (item == nullptr)
				continue;

			// process items according to their native type
			switch (targetclass)
			{
				case ITEM_CLASS_ABSOLUTE:
					if (result == 0)
						result = item->read_as_absolute(code.item_modifier());
					break;

				case ITEM_CLASS_RELATIVE:
					result += item->read_as_relative(code.item_modifier());
					break;

				case ITEM_CLASS_SWITCH:
					result |= item->read_as_switch(code.item_modifier());
					break;

				default:
					break;
			}
		}
	} while (0);

	// stop the profiler before exiting
	g_profiler.stop();
	return result;
}


//-------------------------------------------------
//  code_pressed_once - return non-zero if a given
//  input code has transitioned from off to on
//  since the last call
//-------------------------------------------------

bool input_manager::code_pressed_once(input_code code)
{
	// look for the code in the memory
	bool curvalue = code_pressed(code);
	int empty = -1;
	for (int memnum = 0; memnum < ARRAY_LENGTH(m_switch_memory); memnum++)
	{
		// were we previous pressed on the last time through here?
		if (m_switch_memory[memnum] == code)
		{
			// if no longer pressed, clear entry
			if (curvalue == false)
				m_switch_memory[memnum] = INPUT_CODE_INVALID;

			// always return false
			return false;
		}

		// remember the first empty entry
		if (empty == -1 && m_switch_memory[memnum] == INPUT_CODE_INVALID)
			empty = memnum;
	}

	// if we get here, we were not previously pressed; if still not pressed, return 0
	if (curvalue == false)
		return false;

	// otherwise, add ourself to the memory and return 1
	assert(empty != -1);
	if (empty != -1)
		m_switch_memory[empty] = code;
	return true;
}


//-------------------------------------------------
//  reset_polling - reset memories in preparation
//  for polling
//-------------------------------------------------

void input_manager::reset_polling()
{
	// reset switch memory
	reset_memory();

	// iterate over device classes and devices
	for (input_device_class devclass = DEVICE_CLASS_FIRST_VALID; devclass <= DEVICE_CLASS_LAST_VALID; ++devclass)
		for (int devnum = 0; devnum <= m_class[devclass]->maxindex(); devnum++)
		{
			// fetch the device; ignore if NULL
			input_device *device = m_class[devclass]->device(devnum);
			if (device == nullptr)
				continue;

			// iterate over items within each device
			for (input_item_id itemid = ITEM_ID_FIRST_VALID; itemid <= device->maxitem(); ++itemid)
			{
				// for any non-switch items, set memory equal to the current value
				input_device_item *item = device->item(itemid);
				if (item != nullptr && item->itemclass() != ITEM_CLASS_SWITCH)
					item->set_memory(code_value(input_code(*device, itemid)));
			}
		}
}


//-------------------------------------------------
//  poll_switches - poll for any input
//-------------------------------------------------

input_code input_manager::poll_switches()
{
	// iterate over device classes and devices
	for (input_device_class devclass = DEVICE_CLASS_FIRST_VALID; devclass <= DEVICE_CLASS_LAST_VALID; ++devclass)
		for (int devnum = 0; devnum <= m_class[devclass]->maxindex(); devnum++)
		{
			// fetch the device; ignore if NULL
			input_device *device = m_class[devclass]->device(devnum);
			if (device == nullptr)
				continue;

			// iterate over items within each device
			for (input_item_id itemid = ITEM_ID_FIRST_VALID; itemid <= device->maxitem(); ++itemid)
			{
				input_device_item *item = device->item(itemid);
				if (item != nullptr)
				{
					input_code code(*device, itemid);

					// if the item is natively a switch, poll it
					if (item->itemclass() == ITEM_CLASS_SWITCH)
					{
						if (code_pressed_once(code))
							return code;
						else
							continue;
					}

					// skip if there is not enough axis movement
					if (!code_check_axis(*item, code))
						continue;

					// otherwise, poll axes digitally
					code.set_item_class(ITEM_CLASS_SWITCH);

					// if this is a joystick X axis, check with left/right modifiers
					if (devclass == DEVICE_CLASS_JOYSTICK && code.item_id() == ITEM_ID_XAXIS)
					{
						code.set_item_modifier(ITEM_MODIFIER_LEFT);
						if (code_pressed_once(code))
							return code;
						code.set_item_modifier(ITEM_MODIFIER_RIGHT);
						if (code_pressed_once(code))
							return code;
					}

					// if this is a joystick Y axis, check with up/down modifiers
					else if (devclass == DEVICE_CLASS_JOYSTICK && code.item_id() == ITEM_ID_YAXIS)
					{
						code.set_item_modifier(ITEM_MODIFIER_UP);
						if (code_pressed_once(code))
							return code;
						code.set_item_modifier(ITEM_MODIFIER_DOWN);
						if (code_pressed_once(code))
							return code;
					}

					// any other axis, check with pos/neg modifiers
					else
					{
						code.set_item_modifier(ITEM_MODIFIER_POS);
						if (code_pressed_once(code))
							return code;
						code.set_item_modifier(ITEM_MODIFIER_NEG);
						if (code_pressed_once(code))
							return code;
					}
				}
			}
		}

	// if nothing, return an invalid code
	return INPUT_CODE_INVALID;
}


//-------------------------------------------------
//  poll_keyboard_switches - poll for any
//  keyboard-specific input
//-------------------------------------------------

input_code input_manager::poll_keyboard_switches()
{
	// iterate over devices within each class
	for (int devnum = 0; devnum < m_keyboard_class.maxindex(); devnum++)
	{
		// fetch the device; ignore if NULL
		input_device *device = m_keyboard_class.device(devnum);
		if (device == nullptr)
			continue;

		// iterate over items within each device
		for (input_item_id itemid = ITEM_ID_FIRST_VALID; itemid <= device->maxitem(); ++itemid)
		{
			input_device_item *item = device->item(itemid);
			if (item != nullptr && item->itemclass() == ITEM_CLASS_SWITCH)
			{
				input_code code(*device, itemid);
				if (code_pressed_once(code))
					return code;
			}
		}
	}

	// if nothing, return an invalid code
	return INPUT_CODE_INVALID;
}


//-------------------------------------------------
//  code_check_axis - see if axis has moved far
//  enough to trigger a read when polling
//-------------------------------------------------

bool input_manager::code_check_axis(input_device_item &item, input_code code)
{
	// if we've already reported this one, don't bother
	if (item.memory() == INVALID_AXIS_VALUE)
		return false;

	// ignore min/max for lightguns
	// so the selection will not be affected by a gun going out of range
	INT32 curval = code_value(code);
	if (code.device_class() == DEVICE_CLASS_LIGHTGUN &&
		(code.item_id() == ITEM_ID_XAXIS || code.item_id() == ITEM_ID_YAXIS) &&
		(curval == INPUT_ABSOLUTE_MAX || curval == INPUT_ABSOLUTE_MIN))
		return false;

	// compute the diff against memory
	INT32 diff = curval - item.memory();
	if (diff < 0)
		diff = -diff;

	// for absolute axes, look for 25% of maximum
	if (item.itemclass() == ITEM_CLASS_ABSOLUTE && diff > (INPUT_ABSOLUTE_MAX - INPUT_ABSOLUTE_MIN) / 4)
	{
		item.set_memory(INVALID_AXIS_VALUE);
		return true;
	}

	// for relative axes, look for ~20 pixels movement
	if (item.itemclass() == ITEM_CLASS_RELATIVE && diff > 20 * INPUT_RELATIVE_PER_PIXEL)
	{
		item.set_memory(INVALID_AXIS_VALUE);
		return true;
	}
	return false;
}


//-------------------------------------------------
//  poll_axes - poll for any input
//-------------------------------------------------

input_code input_manager::poll_axes()
{
	// iterate over device classes and devices
	for (input_device_class devclass = DEVICE_CLASS_FIRST_VALID; devclass <= DEVICE_CLASS_LAST_VALID; ++devclass)
		for (int devnum = 0; devnum <= m_class[devclass]->maxindex(); devnum++)
		{
			// fetch the device; ignore if NULL
			input_device *device = m_class[devclass]->device(devnum);
			if (device == nullptr)
				continue;

			// iterate over items within each device
			for (input_item_id itemid = ITEM_ID_FIRST_VALID; itemid <= device->maxitem(); ++itemid)
			{
				input_device_item *item = device->item(itemid);
				if (item != nullptr && item->itemclass() != ITEM_CLASS_SWITCH)
				{
					input_code code(*device, itemid);
					if (code_check_axis(*item, code))
						return code;
				}
			}
		}

	// if nothing, return an invalid code
	return INPUT_CODE_INVALID;
}


//-------------------------------------------------
//  device_from_code - given an input_code return
//  a pointer to the associated device
//-------------------------------------------------

input_device *input_manager::device_from_code(input_code code) const
{
	// if the class is valid, return the appropriate device pointer
	input_device_class devclass = code.device_class();
	if (devclass >= DEVICE_CLASS_FIRST_VALID && devclass <= DEVICE_CLASS_LAST_VALID)
		return m_class[devclass]->device(code.device_index());

	// otherwise, return NULL
	return nullptr;
}


//-------------------------------------------------
//  item_from_code - given an input_code return
//  a pointer to the appropriate input_device_item
//-------------------------------------------------

input_device_item *input_manager::item_from_code(input_code code) const
{
	// first get the device; if none, then we don't have an item
	input_device *device = device_from_code(code);
	if (device == nullptr)
		return nullptr;

	// then return the device's item
	return device->item(code.item_id());
}


//-------------------------------------------------
//  reset_memory - reset the array of memory for
//  pressed switches
//-------------------------------------------------

void input_manager::reset_memory()
{
	// reset all entries in switch memory to invalid
	for (auto & elem : m_switch_memory)
		elem = INPUT_CODE_INVALID;
}


//-------------------------------------------------
//  code_from_itemid - translates an input_item_id
//  to an input_code
//-------------------------------------------------

input_code input_manager::code_from_itemid(input_item_id itemid) const
{
	// iterate over device classes and devices
	for (input_device_class devclass = DEVICE_CLASS_FIRST_VALID; devclass <= DEVICE_CLASS_LAST_VALID; ++devclass)
		for (int devnum = 0; devnum <= m_class[devclass]->maxindex(); devnum++)
		{
			input_device *device = m_class[devclass]->device(devnum);
			if (device != nullptr && device->item(itemid) != nullptr)
				return input_code(*device, itemid);
		}

	return INPUT_CODE_INVALID;
}


//-------------------------------------------------
//  code_name - convert an input code into a
//  friendly name
//-------------------------------------------------

const char *input_manager::code_name(std::string &str, input_code code) const
{
	str.clear();

	// if nothing there, return an empty string
	input_device_item *item = item_from_code(code);
	if (item == nullptr)
		return str.c_str();

	// determine the devclass part
	const char *devclass = (*devclass_string_table)[code.device_class()];

	// determine the devindex part
	std::string devindex;
	strprintf(devindex, "%d", code.device_index() + 1);

	// if we're unifying all devices, don't display a number
	if (!m_class[code.device_class()]->multi())
		devindex.clear();

	// keyboard 0 doesn't show a class or index if it is the only one
	input_device_class device_class = item->device().devclass();
	if (device_class == DEVICE_CLASS_KEYBOARD && m_keyboard_class.maxindex() == 0)
	{
		devclass = "";
		devindex.clear();
	}

	// devcode part comes from the item name
	const char *devcode = item->name();

	// determine the modifier part
	const char *modifier = (*modifier_string_table)[code.item_modifier()];

	// devcode is redundant with joystick switch left/right/up/down
	if (device_class == DEVICE_CLASS_JOYSTICK && code.item_class() == ITEM_CLASS_SWITCH)
		if (code.item_modifier() >= ITEM_MODIFIER_LEFT && code.item_modifier() <= ITEM_MODIFIER_DOWN)
			devcode = "";

	// concatenate the strings
	str.assign(devclass);
	if (!devindex.empty())
		str.append(" ").append(devindex);
	if (devcode[0] != 0)
		str.append(" ").append(devcode);
	if (modifier != nullptr)
		str.append(" ").append(modifier);

	// delete any leading spaces
	strtrimspace(str);
	return str.c_str();
}


//-------------------------------------------------
//  code_to_token - create a token for a given code
//-------------------------------------------------

const char *input_manager::code_to_token(std::string &str, input_code code) const
{
	// determine the devclass part
	const char *devclass = (*devclass_token_table)[code.device_class()];

	// determine the devindex part; keyboard 0 doesn't show an index
	std::string devindex;
	strprintf(devindex, "%d", code.device_index() + 1);
	if (code.device_class() == DEVICE_CLASS_KEYBOARD && code.device_index() == 0)
		devindex.clear();

	// determine the itemid part; look up in the table if we don't have a token
	input_device_item *item = item_from_code(code);
	const char *devcode = (item != nullptr) ? item->token() : "UNKNOWN";

	// determine the modifier part
	const char *modifier = (*modifier_token_table)[code.item_modifier()];

	// determine the itemclass part; if we match the native class, we don't include this
	const char *itemclass = "";
	if (item == nullptr || item->itemclass() != code.item_class())
		itemclass = (*itemclass_token_table)[code.item_class()];

	// concatenate the strings
	str.assign(devclass);
	if (!devindex.empty())
		str.append("_").append(devindex);
	if (devcode[0] != 0)
		str.append("_").append(devcode);
	if (modifier != nullptr)
		str.append("_").append(modifier);
	if (itemclass[0] != 0)
		str.append("_").append(itemclass);
	return str.c_str();
}


//-------------------------------------------------
//  code_from_token - extract an input code from a
//  token
//-------------------------------------------------

input_code input_manager::code_from_token(const char *_token)
{
	// copy the token and break it into pieces
	std::string token[6];
	int numtokens;
	for (numtokens = 0; numtokens < ARRAY_LENGTH(token); )
	{
		// make a token up to the next underscore
		char *score = (char *)strchr(_token, '_');
		token[numtokens++].assign(_token, (score == nullptr) ? strlen(_token) : (score - _token));

		// if we hit the end, we're done, else advance our pointer
		if (score == nullptr)
			break;
		_token = score + 1;
	}

	// first token should be the devclass
	int curtok = 0;
	input_device_class devclass = input_device_class((*devclass_token_table)[token[curtok++].c_str()]);
	if (devclass == ~input_device_class(0))
		return INPUT_CODE_INVALID;

	// second token might be index; look for number
	int devindex = 0;
	if (numtokens > 2 && sscanf(token[curtok].c_str(), "%d", &devindex) == 1)
	{
		curtok++;
		devindex--;
	}
	if (curtok >= numtokens)
		return INPUT_CODE_INVALID;

	// next token is the item ID
	input_item_id itemid = input_item_id((*itemid_token_table)[token[curtok].c_str()]);
	bool standard = (itemid != ~input_item_id(0));

	// if we're a standard code, default the itemclass based on it
	input_item_class itemclass = ITEM_CLASS_INVALID;
	if (standard)
		itemclass = m_class[devclass]->standard_item_class(itemid);

	// otherwise, keep parsing
	else
	{
		// if this is an invalid device, we have nothing to look up
		input_device *device = m_class[devclass]->device(devindex);
		if (device == nullptr)
			return INPUT_CODE_INVALID;

		// if not a standard code, look it up in the device specific codes
		for (itemid = ITEM_ID_FIRST_VALID; itemid <= device->maxitem(); ++itemid)
		{
			input_device_item *item = device->item(itemid);
			if (item != nullptr && token[curtok].compare(item->token()) == 0)
			{
				// take the itemclass from the item
				itemclass = item->itemclass();
				break;
			}
		}

		// bail on fail
		if (itemid > device->maxitem())
			return INPUT_CODE_INVALID;
	}
	curtok++;

	// if we have another token, it is probably a modifier
	input_item_modifier modifier = ITEM_MODIFIER_NONE;
	if (curtok < numtokens)
	{
		modifier = input_item_modifier((*modifier_token_table)[token[curtok].c_str()]);
		if (modifier != ~input_item_modifier(0))
			curtok++;
		else
			modifier = ITEM_MODIFIER_NONE;
	}

	// if we have another token, it is the item class
	if (curtok < numtokens)
	{
		UINT32 temp = (*itemclass_token_table)[token[curtok].c_str()];
		if (temp != ~0)
		{
			curtok++;
			itemclass = input_item_class(temp);
		}
	}

	// we should have consumed all tokens
	if (curtok != numtokens)
		return INPUT_CODE_INVALID;

	// assemble the final code
	return input_code(devclass, devindex, itemclass, modifier, itemid);
}


//-------------------------------------------------
//  seq_pressed - return true if the given sequence
//  of switch inputs is "pressed"
//-------------------------------------------------

bool input_manager::seq_pressed(const input_seq &seq)
{
	// iterate over all of the codes
	bool result = false;
	bool invert = false;
	bool first = true;
	for (int codenum = 0; ; codenum++)
	{
		// handle NOT
		input_code code = seq[codenum];
		if (code == input_seq::not_code)
			invert = true;

		// handle OR and END
		else if (code == input_seq::or_code || code == input_seq::end_code)
		{
			// if we have a positive result from the previous set, we're done
			if (result || code == input_seq::end_code)
				break;

			// otherwise, reset our state
			result = false;
			invert = false;
			first = true;
		}

		// handle everything else as a series of ANDs
		else
		{
			// if this is the first in the sequence, result is set equal
			if (first)
				result = code_pressed(code) ^ invert;

			// further values are ANDed
			else if (result)
				result &= code_pressed(code) ^ invert;

			// no longer first, and clear the invert flag
			first = invert = false;
		}
	}

	// return the result if we queried at least one switch
	return result;
}


//-------------------------------------------------
//  seq_axis_value - return the value of an axis
//  defined in an input sequence
//-------------------------------------------------

INT32 input_manager::seq_axis_value(const input_seq &seq, input_item_class &itemclass)
{
	// start with no valid classes
	input_item_class itemclasszero = ITEM_CLASS_INVALID;
	itemclass = ITEM_CLASS_INVALID;

	// iterate over all of the codes
	INT32 result = 0;
	bool invert = false;
	bool enable = true;
	for (int codenum = 0; ; codenum++)
	{
		// handle NOT
		input_code code = seq[codenum];
		if (code == input_seq::not_code)
			invert = true;

		// handle OR and END
		else if (code == input_seq::or_code || code == input_seq::end_code)
		{
			// if we have a positive result from the previous set, we're done
			if (itemclass != ITEM_CLASS_INVALID || code == input_seq::end_code)
				break;

			// otherwise, reset our state
			result = 0;
			invert = false;
			enable = true;
		}

		// handle everything else only if we're still enabled
		else if (enable)
		{
			// switch codes serve as enables
			if (code.item_class() == ITEM_CLASS_SWITCH)
			{
				// AND against previous digital codes
				if (enable)
					enable &= code_pressed(code) ^ invert;
			}

			// non-switch codes are analog values
			else
			{
				INT32 value = code_value(code);

				// if we got a 0 value, don't do anything except remember the first type
				if (value == 0)
				{
					if (itemclasszero == ITEM_CLASS_INVALID)
						itemclasszero = code.item_class();
				}

				// non-zero absolute values stick
				else if (code.item_class() == ITEM_CLASS_ABSOLUTE)
				{
					itemclass = ITEM_CLASS_ABSOLUTE;
					result = value;
				}

				// non-zero relative values accumulate
				else if (code.item_class() == ITEM_CLASS_RELATIVE)
				{
					itemclass = ITEM_CLASS_RELATIVE;
					result += value;
				}
			}

			// clear the invert flag
			invert = false;
		}
	}

	// if the caller wants to know the type, provide it
	if (result == 0)
		itemclass = itemclasszero;
	return result;
}


//-------------------------------------------------
//  seq_poll_start - begin polling for a new
//  sequence of the given itemclass
//-------------------------------------------------

void input_manager::seq_poll_start(input_item_class itemclass, const input_seq *startseq)
{
	assert(itemclass == ITEM_CLASS_SWITCH || itemclass == ITEM_CLASS_ABSOLUTE || itemclass == ITEM_CLASS_RELATIVE);

	// reset the recording count and the clock
	m_poll_seq_last_ticks = 0;
	m_poll_seq_class = itemclass;
	m_poll_seq.reset();

	// grab the starting sequence to append to, and append an OR
	if (startseq != nullptr)
	{
		m_poll_seq = *startseq;
		if (m_poll_seq.length() > 0)
			m_poll_seq += input_seq::or_code;
	}

	// flush out any goobers
	reset_polling();
	input_code dummycode = KEYCODE_ENTER;
	while (dummycode != INPUT_CODE_INVALID)
		dummycode = (m_poll_seq_class == ITEM_CLASS_SWITCH) ? poll_switches() : poll_axes();
}


//-------------------------------------------------
//  input_seq_poll - continue polling
//-------------------------------------------------

bool input_manager::seq_poll()
{
	int curlen = m_poll_seq.length();
	input_code lastcode = m_poll_seq[curlen - 1];

	// switch case: see if we have a new code to process
	input_code newcode;
	if (m_poll_seq_class == ITEM_CLASS_SWITCH)
	{
		newcode = poll_switches();
		if (newcode != INPUT_CODE_INVALID)
		{
			// if code is duplicate, toggle the NOT state on the code
			if (curlen > 0 && newcode == lastcode)
			{
				// back up over the existing code
				m_poll_seq.backspace();

				// if there was a NOT preceding it, delete it as well, otherwise append a fresh one
				if (m_poll_seq[curlen - 2] == input_seq::not_code)
					m_poll_seq.backspace();
				else
					m_poll_seq += input_seq::not_code;
			}
		}
	}

	// absolute/relative case: see if we have an analog change of sufficient amount
	else
	{
		bool has_or = false;
		if (lastcode == input_seq::or_code)
		{
			lastcode = m_poll_seq[curlen - 2];
			has_or = true;
		}
		newcode = poll_axes();

		// if the last code doesn't match absolute/relative of this code, ignore the new one
		if ((lastcode.item_class() == ITEM_CLASS_ABSOLUTE && newcode.item_class() != ITEM_CLASS_ABSOLUTE) ||
			(lastcode.item_class() == ITEM_CLASS_RELATIVE && newcode.item_class() != ITEM_CLASS_RELATIVE))
			newcode = INPUT_CODE_INVALID;

		// if the new code is valid, check for half-axis toggles on absolute controls
		if (newcode != INPUT_CODE_INVALID && curlen > 0 && newcode.item_class() == ITEM_CLASS_ABSOLUTE)
		{
			input_code last_nomodifier = lastcode;
			last_nomodifier.set_item_modifier(ITEM_MODIFIER_NONE);
			if (newcode == last_nomodifier)
			{
				// increment the modifier, wrapping back to none
				switch (lastcode.item_modifier())
				{
					case ITEM_MODIFIER_NONE:    newcode.set_item_modifier(ITEM_MODIFIER_POS);   break;
					case ITEM_MODIFIER_POS:     newcode.set_item_modifier(ITEM_MODIFIER_NEG);   break;
					default:
					case ITEM_MODIFIER_NEG:     newcode.set_item_modifier(ITEM_MODIFIER_NONE);  break;
				}

				// back up over the previous code so we can re-append
				if (has_or)
					m_poll_seq.backspace();
				m_poll_seq.backspace();
			}
		}
	}

	// if we got a new code to append it, append it and reset the timer
	if (newcode != INPUT_CODE_INVALID)
	{
		m_poll_seq += newcode;
		m_poll_seq_last_ticks = osd_ticks();
	}

	// if we're recorded at least one item and 2/3 of a second has passed, we're done
	if (m_poll_seq_last_ticks != 0 && osd_ticks() > m_poll_seq_last_ticks + osd_ticks_per_second() * 2 / 3)
	{
		// if the final result is invalid, reset to nothing
		if (!m_poll_seq.is_valid())
			m_poll_seq.reset();

		// return true to indicate that we are finished
		return true;
	}

	// return false to indicate we are still polling
	return false;
}


//-------------------------------------------------
//  seq_name - generate the friendly name of a
//  sequence
//-------------------------------------------------

const char *input_manager::seq_name(std::string &str, const input_seq &seq) const
{
	// make a copy of our sequence, removing any invalid bits
	input_code clean_codes[sizeof(seq) / sizeof(input_code)];
	int clean_index = 0;
	std::string codestr;
	for (int codenum = 0; seq[codenum] != input_seq::end_code; codenum++)
	{
		// if this is a code item which is not valid, don't copy it and remove any preceding ORs/NOTs
		input_code code = seq[codenum];
		if (!code.internal() && *(code_name(codestr, code)) == 0)
		{
			while (clean_index > 0 && clean_codes[clean_index - 1].internal())
				clean_index--;
		}
		else if (clean_index > 0 || !code.internal())
			clean_codes[clean_index++] = code;
	}

	// special case: empty
	if (clean_index == 0)
		return str.assign((seq.length() == 0) ? "None" : "n/a").c_str();

	// start with an empty buffer
	str.clear();

	// loop until we hit the end
	for (int codenum = 0; codenum < clean_index; codenum++)
	{
		// append a space if not the first code
		if (codenum != 0)
			str.append(" ");

		// handle OR/NOT codes here
		input_code code = clean_codes[codenum];
		if (code == input_seq::or_code)
			str.append("or");
		else if (code == input_seq::not_code)
			str.append("not");

		// otherwise, assume it is an input code and ask the input system to generate it
		else
			str.append(code_name(codestr, code));
	}
	return str.c_str();
}


//-------------------------------------------------
//  seq_to_tokens - generate the tokenized form of
//  a sequence
//-------------------------------------------------

const char *input_manager::seq_to_tokens(std::string &str, const input_seq &seq) const
{
	// start with an empty buffer
	str.clear();

	// loop until we hit the end
	std::string codestr;
	for (int codenum = 0; seq[codenum] != input_seq::end_code; codenum++)
	{
		// append a space if not the first code
		if (codenum != 0)
			str.append(" ");

		// handle OR/NOT codes here
		input_code code = seq[codenum];
		if (code == input_seq::or_code)
			str.append("OR");
		else if (code == input_seq::not_code)
			str.append("NOT");
		else if (code == input_seq::default_code)
			str.append("DEFAULT");

		// otherwise, assume it is an input code and ask the input system to generate it
		else
			str.append(code_to_token(codestr, code));
	}
	return str.c_str();
}


//-------------------------------------------------
//  seq_from_tokens - generate the tokenized form
//  of a sequence
//-------------------------------------------------

void input_manager::seq_from_tokens(input_seq &seq, const char *string)
{
	// start with a blank sequence
	seq.reset();

	// loop until we're done
	std::string strcopy = string;
	char *str = const_cast<char *>(strcopy.c_str());
	while (1)
	{
		// trim any leading spaces
		while (*str != 0 && isspace((UINT8)*str))
			str++;

		// bail if we're done
		if (*str == 0)
			return;

		// find the end of the token and make it upper-case along the way
		char *strtemp;
		for (strtemp = str; *strtemp != 0 && !isspace((UINT8)*strtemp); strtemp++)
			*strtemp = toupper((UINT8)*strtemp);
		char origspace = *strtemp;
		*strtemp = 0;

		// look for common stuff
		input_code code;
		if (strcmp(str, "OR") == 0)
			code = input_seq::or_code;
		else if (strcmp(str, "NOT") == 0)
			code = input_seq::not_code;
		else if (strcmp(str, "DEFAULT") == 0)
			code = input_seq::default_code;
		else
			code = code_from_token(str);

		// translate and add to the sequence
		seq += code;

		// advance
		if (origspace == 0)
			return;
		str = strtemp + 1;
	}
}


//-------------------------------------------------
//  set_global_joystick_map - set the joystick map
//  for all devices
//-------------------------------------------------

bool input_manager::set_global_joystick_map(const char *mapstring)
{
	// parse the map
	joystick_map map;
	if (!map.parse(mapstring))
		return false;

	std::string tempstr;
	osd_printf_verbose("Input: Changing default joystick map = %s\n", map.to_string(tempstr));

	// iterate over joysticks and set the map
	for (int joynum = 0; joynum <= m_joystick_class.maxindex(); joynum++)
	{
		input_device *device = m_joystick_class.device(joynum);
		if (device != nullptr)
			device->set_joystick_map(map);
	}
	return true;
}



//**************************************************************************
//  INPUT DEVICE ITEM
//**************************************************************************

//-------------------------------------------------
//  input_device_item - constructor
//-------------------------------------------------

input_device_item::input_device_item(input_device &device, const char *name, void *internal, input_item_id itemid, item_get_state_func getstate, input_item_class itemclass)
	: m_device(device),
		m_name(name),
		m_internal(internal),
		m_itemid(itemid),
		m_itemclass(itemclass),
		m_getstate(getstate),
		m_current(0),
		m_memory(0)
{
	// use a standard token name for know item IDs
	if (itemid <= ITEM_ID_MAXIMUM && (*itemid_token_table)[itemid] != nullptr)
		m_token.assign((*itemid_token_table)[itemid]);

	// otherwise, create a tokenized name
	else {
		m_token.assign(name);
		strmakeupper(m_token);
		strdelchr(m_token, ' ');
		strdelchr(m_token, '_');
	}
}


//-------------------------------------------------
//  input_device_item - destructor
//-------------------------------------------------

input_device_item::~input_device_item()
{
}



//**************************************************************************
//  INPUT DEVICE SWITCH ITEM
//**************************************************************************

//-------------------------------------------------
//  input_device_switch_item - constructor
//-------------------------------------------------

input_device_switch_item::input_device_switch_item(input_device &device, const char *name, void *internal, input_item_id itemid, item_get_state_func getstate)
	: input_device_item(device, name, internal, itemid, getstate, ITEM_CLASS_SWITCH),
		m_steadykey(0),
		m_oldkey(0)
{
}


//-------------------------------------------------
//  read_as_switch - return the raw switch value,
//  modified as necessary
//-------------------------------------------------

INT32 input_device_switch_item::read_as_switch(input_item_modifier modifier)
{
	// if we're doing a lightgun reload hack, button 1 and 2 operate differently
	input_device_class devclass = m_device.devclass();
	if (devclass == DEVICE_CLASS_LIGHTGUN && m_device.lightgun_reload_button())
	{
		// button 1 is pressed if either button 1 or 2 are active
		if (m_itemid == ITEM_ID_BUTTON1)
		{
			input_device_item *button2_item = m_device.item(ITEM_ID_BUTTON2);
			if (button2_item != nullptr)
				return button2_item->update_value() | update_value();
		}

		// button 2 is never officially pressed
		if (m_itemid == ITEM_ID_BUTTON2)
			return 0;
	}

	// steadykey for keyboards
	if (devclass == DEVICE_CLASS_KEYBOARD && m_device.steadykey_enabled())
		return m_steadykey;

	// everything else is just the current value as-is
	return update_value();
}


//-------------------------------------------------
//  read_as_relative - return the switch input as
//  a relative axis value
//-------------------------------------------------

INT32 input_device_switch_item::read_as_relative(input_item_modifier modifier)
{
	// no translation to relative
	return 0;
}


//-------------------------------------------------
//  read_as_absolute - return the switch input as
//  an absolute axis value
//-------------------------------------------------

INT32 input_device_switch_item::read_as_absolute(input_item_modifier modifier)
{
	// no translation to absolute
	return 0;
}


//-------------------------------------------------
//  steadykey_changed - update for steadykey
//  behavior, returning true if the current state
//  has changed since the last call
//-------------------------------------------------

bool input_device_switch_item::steadykey_changed()
{
	INT32 old = m_oldkey;
	m_oldkey = update_value();
	if (((m_current ^ old) & 1) == 0)
		return false;

	// if the keypress was missed, turn it on for one frame
	if (((m_current | m_steadykey) & 1) == 0)
		m_steadykey = 1;
	return true;
}



//**************************************************************************
//  INPUT DEVICE RELATIVE ITEM
//**************************************************************************

//-------------------------------------------------
//  input_device_relative_item - constructor
//-------------------------------------------------

input_device_relative_item::input_device_relative_item(input_device &device, const char *name, void *internal, input_item_id itemid, item_get_state_func getstate)
	: input_device_item(device, name, internal, itemid, getstate, ITEM_CLASS_RELATIVE)
{
}


//-------------------------------------------------
//  read_as_switch - return the relative value as
//  a switch result based on the modifier
//-------------------------------------------------

INT32 input_device_relative_item::read_as_switch(input_item_modifier modifier)
{
	// process according to modifiers
	if (modifier == ITEM_MODIFIER_POS || modifier == ITEM_MODIFIER_RIGHT || modifier == ITEM_MODIFIER_DOWN)
		return (update_value() > 0);
	else if (modifier == ITEM_MODIFIER_NEG || modifier == ITEM_MODIFIER_LEFT || modifier == ITEM_MODIFIER_UP)
		return (update_value() < 0);

	// all other cases just return 0
	return 0;
}


//-------------------------------------------------
//  read_as_relative - return the relative input
//  as a relative axis value
//-------------------------------------------------

INT32 input_device_relative_item::read_as_relative(input_item_modifier modifier)
{
	// just return directly
	return update_value();
}


//-------------------------------------------------
//  read_as_absolute - return the relative input
//  as an absolute axis value
//-------------------------------------------------

INT32 input_device_relative_item::read_as_absolute(input_item_modifier modifier)
{
	// no translation to absolute
	return 0;
}



//**************************************************************************
//  INPUT DEVICE ABSOLUTE ITEM
//**************************************************************************

//-------------------------------------------------
//  input_device_absolute_item - constructor
//-------------------------------------------------

input_device_absolute_item::input_device_absolute_item(input_device &device, const char *name, void *internal, input_item_id itemid, item_get_state_func getstate)
	: input_device_item(device, name, internal, itemid, getstate, ITEM_CLASS_ABSOLUTE)
{
}


//-------------------------------------------------
//  read_as_switch - return the absolute value as
//  a switch result based on the modifier
//-------------------------------------------------

INT32 input_device_absolute_item::read_as_switch(input_item_modifier modifier)
{
	// start with the current value
	INT32 result = m_device.apply_deadzone_and_saturation(update_value());
	assert(result >= INPUT_ABSOLUTE_MIN && result <= INPUT_ABSOLUTE_MAX);

	// left/right/up/down: if this is a joystick, fetch the paired X/Y axis values and convert
	if (m_device.devclass() == DEVICE_CLASS_JOYSTICK && modifier >= ITEM_MODIFIER_LEFT && modifier <= ITEM_MODIFIER_DOWN)
	{
		input_device_item *xaxis_item = m_device.item(ITEM_ID_XAXIS);
		input_device_item *yaxis_item = m_device.item(ITEM_ID_YAXIS);
		if (xaxis_item != nullptr && yaxis_item != nullptr)
		{
			// determine which item we didn't update, and update it
			assert(this == xaxis_item || this == yaxis_item);
			if (this == xaxis_item)
				yaxis_item->update_value();
			else
				xaxis_item->update_value();

			// now map the X and Y axes to a 9x9 grid using the raw values
			return (m_device.joymap().update(xaxis_item->current(), yaxis_item->current()) >> (modifier - ITEM_MODIFIER_LEFT)) & 1;
		}
	}

	// positive/negative: TRUE if past the deadzone in either direction
	if (modifier == ITEM_MODIFIER_POS || modifier == ITEM_MODIFIER_RIGHT || modifier == ITEM_MODIFIER_DOWN)
		return (result > 0);
	else if (modifier == ITEM_MODIFIER_NEG || modifier == ITEM_MODIFIER_LEFT || modifier == ITEM_MODIFIER_UP)
		return (result < 0);

	// all other cases just return 0
	return 0;
}


//-------------------------------------------------
//  read_as_relative - return the absolute input
//  as a relative axis value
//-------------------------------------------------

INT32 input_device_absolute_item::read_as_relative(input_item_modifier modifier)
{
	// no translation to relative
	return 0;
}


//-------------------------------------------------
//  read_as_absolute - return the absolute input
//  as an absolute axis value, with appropriate
//  tweaks
//-------------------------------------------------

INT32 input_device_absolute_item::read_as_absolute(input_item_modifier modifier)
{
	// start with the current value
	INT32 result = m_device.apply_deadzone_and_saturation(update_value());
	assert(result >= INPUT_ABSOLUTE_MIN && result <= INPUT_ABSOLUTE_MAX);

	// if we're doing a lightgun reload hack, override the value
	if (m_device.devclass() == DEVICE_CLASS_LIGHTGUN && m_device.lightgun_reload_button())
	{
		// if it is pressed, return (min,max)
		input_device_item *button2_item = m_device.item(ITEM_ID_BUTTON2);
		if (button2_item != nullptr && button2_item->update_value())
			result = (m_itemid == ITEM_ID_XAXIS) ? INPUT_ABSOLUTE_MIN : INPUT_ABSOLUTE_MAX;
	}

	// positive/negative: scale to full axis
	if (modifier == ITEM_MODIFIER_POS)
		result = MAX(result, 0) * 2 + INPUT_ABSOLUTE_MIN;
	if (modifier == ITEM_MODIFIER_NEG)
		result = MAX(-result, 0) * 2 + INPUT_ABSOLUTE_MIN;
	return result;
}