src/basics.h

/*
 *  LDForge: LDraw parts authoring CAD
 *  Copyright (C) 2013 - 2020 Teemu Piippo
 *
 *  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 3 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, see <http://www.gnu.org/licenses/>.
 */

#pragma once
#include <algorithm>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <optional>
#include <QMatrix4x4>
#include <QObject>
#include <QPointF>
#include <QSet>
#include <QString>
#include <QStringList>
#include <QVariant>
#include <QVector>
#include <QVector3D>
#include <glm/glm.hpp>

using GLRotationMatrix = QMatrix4x4;

enum Axis
{
	X = 0,
	Y = 1,
	Z = 2
};

enum Result
{
	Success = 0,
	PartialSuccess,
	Failure
};

constexpr bool failed(Result r)
{
	return r == Failure;
}

enum Winding
{
	NoWinding,
	Anticlockwise,
	Clockwise,
};

/*
 * Special operator definition that implements the XOR operator for windings.
 * However, if either winding is NoWinding, then this function returns NoWinding.
 */
inline Winding operator^(Winding one, Winding other)
{
	if (one == NoWinding or other == NoWinding)
		return NoWinding;
	else
		return static_cast<Winding>(static_cast<int>(one) ^ static_cast<int>(other));
}

inline Winding& operator^=(Winding& one, Winding other)
{
	one = one ^ other;
	return one;
}

template<typename T, int N>
constexpr int countof(T(&)[N])
{
	return N;
}

/**
 * @brief casts @c x to a suitable unsigned integer
 */
template<typename T>
constexpr auto unsigned_cast(T x)
	-> std::enable_if_t<std::is_integral_v<T>, std::make_unsigned_t<T>>
{
	return static_cast<std::make_unsigned_t<T>>(x);
}

/**
 * @brief casts @c x to a suitable signed integer
 */
template<typename T>
constexpr auto signed_cast(T x)
	-> std::enable_if_t<std::is_integral_v<T>, std::make_signed_t<T>>
{
	return static_cast<std::make_signed_t<T>>(x);
}


/**
* @brief casts double and long double - and only those types - to float
* @param[in] x double or long double to cast
* @returns float
*/
template<typename T>
auto doubleToFloat(T x)
	-> std::enable_if_t<
		std::is_same_v<std::decay_t<T>, double> ||
		std::is_same_v<std::decay_t<T>, long double
	>, float>
{
	return static_cast<float>(x);
}

/**
* @brief Casts float - and only float - to double
* @param[in] x float to cast
* @returns double
*/
template<typename T>
auto floatToDouble(T x)
	-> std::enable_if_t<std::is_same_v<std::decay_t<T>, float>, double>
{
	return static_cast<double>(x);
}
Q_DECLARE_METATYPE(glm::vec3)
Q_DECLARE_METATYPE(glm::mat4)