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love / src / modules / joystick / sdl / Joystick.cpp

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/**
 * Copyright (c) 2006-2013 LOVE Development Team
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 **/

#include "Joystick.h"

// STD
#include <cmath>

namespace love
{
namespace joystick
{
namespace sdl
{

Joystick::Joystick()
	: joysticks(0)
{
	// Init the SDL joystick system.
	if (SDL_InitSubSystem(SDL_INIT_JOYSTICK) < 0)
		throw love::Exception("%s", SDL_GetError());

	// Start joystick event watching.
	SDL_JoystickEventState(SDL_ENABLE);

	// Open all connected joysticks.
	int numjoysticks = this->getNumJoysticks();
	this->joysticks = (SDL_Joystick **)calloc(numjoysticks, sizeof(SDL_Joystick *));

	for (int i = 0; i<numjoysticks; i++)
		this->open(i);
}

Joystick::~Joystick()
{
	// Closes any open joysticks.
	for (int i = 0; i != getNumJoysticks(); i++)
	{
		if (isOpen(i))
			close(i);
	}

	free(joysticks);

	SDL_QuitSubSystem(SDL_INIT_JOYSTICK);
}

void Joystick::reload()
{
	// Closes any open joysticks.
	for (int i = 0; i != getNumJoysticks(); i++)
	{
		if (isOpen(i))
			close(i);
	}

	free(joysticks);

	SDL_QuitSubSystem(SDL_INIT_JOYSTICK);

	if (SDL_InitSubSystem(SDL_INIT_JOYSTICK) < 0)
		throw love::Exception("%s", SDL_GetError());

	int numjoysticks = this->getNumJoysticks();
	this->joysticks = (SDL_Joystick **)calloc(numjoysticks, sizeof(SDL_Joystick *));

	for (int i = 0; i<numjoysticks; i++)
		this->open(i);
}

const char *Joystick::getName() const
{
	return "love.joystick.sdl";
}

bool Joystick::checkIndex(int index)
{
	return index >= 0 && index < getNumJoysticks();
}

int Joystick::getNumJoysticks()
{
	int num = SDL_NumJoysticks();
	return num < 0 ? 0 : num;
}

const char *Joystick::getName(int index)
{
	return SDL_JoystickName(index);
}

bool Joystick::open(int index)
{
	if (isOpen(index))
		return true;

	if (!checkIndex(index))
		return false;

	if (!(joysticks[index] = SDL_JoystickOpen(index)))
		return false;

	return true;
}

bool Joystick::isOpen(int index)
{
	if (!checkIndex(index))
		return false;

	return joysticks[index] != 0 ? true : false;
}

bool Joystick::verifyJoystick(int index)
{
	if (!checkIndex(index))
		return false;

	if (!isOpen(index))
		return false;

	return true;
}

int Joystick::getNumAxes(int index)
{
	return verifyJoystick(index) ? SDL_JoystickNumAxes(joysticks[index]) : 0;
}

int Joystick::getNumBalls(int index)
{
	return verifyJoystick(index) ? SDL_JoystickNumBalls(joysticks[index]) : 0;
}

int Joystick::getNumButtons(int index)
{
	return verifyJoystick(index) ? SDL_JoystickNumButtons(joysticks[index]) : 0;
}

int Joystick::getNumHats(int index)
{
	return verifyJoystick(index) ? SDL_JoystickNumHats(joysticks[index]) : 0;
}

float Joystick::clampval(float x)
{
	if (fabs((double)x) < 0.01) return 0.0f;
	if (x < -0.99f) return -1.0f;
	if (x > 0.99f) return 1.0f;
	return x;
}

float Joystick::getAxis(int index, int axis)
{
	if (!verifyJoystick(index))
		return 0;

	if (axis >= getNumAxes(index))
		return 0;

	return clampval(((float)SDL_JoystickGetAxis(joysticks[index], axis))/32768.0f);
}

int Joystick::getAxes(lua_State *L)
{
	love::luax_assert_argc(L, 1, 1);
	int index = (int)lua_tointeger(L, 1) - 1;

	if (!verifyJoystick(index))
		return 0;

	int num = getNumAxes(index);

	for (int i = 0; i<num; i++)
		lua_pushnumber(L, clampval(((float)SDL_JoystickGetAxis(joysticks[index], i))/32768.0f));
	return num;
}

int Joystick::getBall(lua_State *L)
{
	love::luax_assert_argc(L, 2, 2);
	int index = (int)lua_tointeger(L, 1) - 1;
	int ball = (int)lua_tointeger(L, 2) - 1;

	if (!verifyJoystick(index))
		return 0;

	if (ball >= getNumBalls(index))
		return 0;

	int dx, dy;
	SDL_JoystickGetBall(joysticks[index], ball, &dx, &dy);

	lua_pushnumber(L, dx);
	lua_pushnumber(L, dy);
	return 2;
}

bool Joystick::isDown(int index, int *buttonlist)
{
	if (!verifyJoystick(index))
		return false;

	int num = getNumButtons(index);

	for (int button = *buttonlist; button != -1; button = *(++buttonlist))
	{
		if (button >= 0 && button < num && SDL_JoystickGetButton(joysticks[index], button) == 1)
			return true;
	}

	return false;
}

Joystick::Hat Joystick::getHat(int index, int hat)
{
	Hat h = HAT_INVALID;

	if (!verifyJoystick(index))
		return h;

	if (hat >= getNumHats(index))
		return h;

	hats.find(SDL_JoystickGetHat(joysticks[index], hat), h);

	return h;
}

void Joystick::close(int index)
{
	if (!checkIndex(index))
		return;

	if (joysticks[index]!=0)
	{
		SDL_JoystickClose(joysticks[index]);
		joysticks[index] = 0;
	}
}

EnumMap<Joystick::Hat, Uint8, Joystick::HAT_MAX_ENUM>::Entry Joystick::hatEntries[] =
{
	{Joystick::HAT_CENTERED, SDL_HAT_CENTERED},
	{Joystick::HAT_UP, SDL_HAT_UP},
	{Joystick::HAT_RIGHT, SDL_HAT_RIGHT},
	{Joystick::HAT_DOWN, SDL_HAT_DOWN},
	{Joystick::HAT_LEFT, SDL_HAT_LEFT},
	{Joystick::HAT_RIGHTUP, SDL_HAT_RIGHTUP},
	{Joystick::HAT_RIGHTDOWN, SDL_HAT_RIGHTDOWN},
	{Joystick::HAT_LEFTUP, SDL_HAT_LEFTUP},
	{Joystick::HAT_LEFTDOWN, SDL_HAT_LEFTDOWN},
};

EnumMap<Joystick::Hat, Uint8, Joystick::HAT_MAX_ENUM> Joystick::hats(Joystick::hatEntries, sizeof(Joystick::hatEntries));

} // sdl
} // joystick
} // love