padkey_linux/gamepad.c

/*
 * Released into the public domain
 * by Aki Goto <tyatsumi@gmail.com>
 */

#include <stdlib.h>
#include "gamepad.h"

void Button_initialize(struct Button *this, int id)
{
	this->id = id;
	this->type = ButtonType_BUTTON;
	this->number = -1;
	this->shift = NULL;
	this->control = NULL;
	this->alt = NULL;
	this->prev = 0;
	this->current = 0;
}

void Button_setDevice(struct Button *this, int type, int number)
{
	this->type = type;
	this->number = number;
}

static void update(struct Button *this, int state)
{
	this->prev = this->current;
	this->current = state;
}

int Button_update(struct Button *this, struct js_event *event)
{
	if (event->type == JS_EVENT_BUTTON) {
		if (this->type == ButtonType_BUTTON) {
			if (event->number != this->number) {
				return 0;
			}
			if (event->value) {
				update(this, 1);
			} else {
				update(this, 0);
			}
			return 1;
		} else {
			return 0;
		}
	} else if (event->type == JS_EVENT_AXIS) {
		if (this->type == ButtonType_POSITIVE_AXIS) {
			if (event->number != this->number) {
				return 0;
			}
			if (event->value >= 16384) {
				update(this, 1);
			} else {
				update(this, 0);
			}
			return 1;
		} else if (this->type == ButtonType_NEGATIVE_AXIS) {
			if (event->number != this->number) {
				return 0;
			}
			if (event->value <= -16384) {
				update(this, 1);
			} else {
				update(this, 0);
			}
			return 1;
		} else {
			return 0;
		}
	} else {
		return 0;
	}
}

int Button_isDown(struct Button *this)
{
	if (!this->prev && this->current) {
		return 1;
	} else {
		return 0;
	}
}

int Button_isUp(struct Button *this)
{
	if (this->prev && !this->current) {
		return 1;
	} else {
		return 0;
	}
}

int Button_isHolded(struct Button *this)
{
	return this->current;
}

void Gamepad_initialize(struct Gamepad *this)
{
	Button_initialize(&this->buttons[ButtonId_UP], ButtonId_UP);
	Button_initialize(&this->buttons[ButtonId_DOWN], ButtonId_DOWN);
	Button_initialize(&this->buttons[ButtonId_LEFT], ButtonId_LEFT);
	Button_initialize(&this->buttons[ButtonId_RIGHT], ButtonId_RIGHT);
	Button_initialize(&this->buttons[ButtonId_A], ButtonId_A);
	Button_initialize(&this->buttons[ButtonId_B], ButtonId_B);
	Button_initialize(&this->buttons[ButtonId_X], ButtonId_X);
	Button_initialize(&this->buttons[ButtonId_Y], ButtonId_Y);
	Button_initialize(&this->buttons[ButtonId_L1], ButtonId_L1);
	Button_initialize(&this->buttons[ButtonId_R1], ButtonId_R1);
	Button_initialize(&this->buttons[ButtonId_L2], ButtonId_L2);
	Button_initialize(&this->buttons[ButtonId_R2], ButtonId_R2);

	this->buttons[ButtonId_UP].shift = &this->buttons[ButtonId_X];
	this->buttons[ButtonId_DOWN].shift = &this->buttons[ButtonId_X];
	this->buttons[ButtonId_LEFT].shift = &this->buttons[ButtonId_X];
	this->buttons[ButtonId_RIGHT].shift = &this->buttons[ButtonId_X];
	this->buttons[ButtonId_A].shift = &this->buttons[ButtonId_DOWN];
	this->buttons[ButtonId_B].shift = &this->buttons[ButtonId_DOWN];
	this->buttons[ButtonId_X].shift = &this->buttons[ButtonId_DOWN];
	this->buttons[ButtonId_Y].shift = &this->buttons[ButtonId_DOWN];

	this->buttons[ButtonId_UP].control = &this->buttons[ButtonId_Y];
	this->buttons[ButtonId_DOWN].control = &this->buttons[ButtonId_Y];
	this->buttons[ButtonId_LEFT].control = &this->buttons[ButtonId_Y];
	this->buttons[ButtonId_RIGHT].control = &this->buttons[ButtonId_Y];
	this->buttons[ButtonId_A].control = &this->buttons[ButtonId_LEFT];
	this->buttons[ButtonId_B].control = &this->buttons[ButtonId_LEFT];
	this->buttons[ButtonId_X].control = &this->buttons[ButtonId_LEFT];
	this->buttons[ButtonId_Y].control = &this->buttons[ButtonId_LEFT];

	this->buttons[ButtonId_UP].alt = &this->buttons[ButtonId_A];
	this->buttons[ButtonId_DOWN].alt = &this->buttons[ButtonId_A];
	this->buttons[ButtonId_LEFT].alt = &this->buttons[ButtonId_A];
	this->buttons[ButtonId_RIGHT].alt = &this->buttons[ButtonId_A];
	this->buttons[ButtonId_A].alt = &this->buttons[ButtonId_RIGHT];
	this->buttons[ButtonId_B].alt = &this->buttons[ButtonId_RIGHT];
	this->buttons[ButtonId_X].alt = &this->buttons[ButtonId_RIGHT];
	this->buttons[ButtonId_Y].alt = &this->buttons[ButtonId_RIGHT];

	Button_setDevice(&this->buttons[ButtonId_UP], ButtonType_NEGATIVE_AXIS, 1);
	Button_setDevice(&this->buttons[ButtonId_DOWN], ButtonType_POSITIVE_AXIS, 1);
	Button_setDevice(&this->buttons[ButtonId_LEFT], ButtonType_NEGATIVE_AXIS, 0);
	Button_setDevice(&this->buttons[ButtonId_RIGHT], ButtonType_POSITIVE_AXIS, 0);
	Button_setDevice(&this->buttons[ButtonId_A], ButtonType_BUTTON, 0);
	Button_setDevice(&this->buttons[ButtonId_B], ButtonType_BUTTON, 1);
	Button_setDevice(&this->buttons[ButtonId_X], ButtonType_BUTTON, 2);
	Button_setDevice(&this->buttons[ButtonId_Y], ButtonType_BUTTON, 3);
	Button_setDevice(&this->buttons[ButtonId_L1], ButtonType_BUTTON, 4);
	Button_setDevice(&this->buttons[ButtonId_R1], ButtonType_BUTTON, 5);
	Button_setDevice(&this->buttons[ButtonId_L2], ButtonType_BUTTON, 6);
	Button_setDevice(&this->buttons[ButtonId_R2], ButtonType_BUTTON, 7);
}