tex_coord.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
 *                                                                           *
 * All rights reserved.                                                      *
 *                                                                           *
 * This program is free software; you can redistribute it and/or modify      *
 * it under the terms of the Mozilla Public License Version 2.0 as published *
 * by the Mozilla 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              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_SPACE_CORE_TEX_COORD_H
#define VCL_SPACE_CORE_TEX_COORD_H
 
#include "point.h"
 
namespace vcl {
 
// TODO: TexCoord should inherit from Point2
template<typename Scalar>
class TexCoord
{
    template<typename S>
    friend class TexCoord;
 
    Point2<Scalar> mCoord;
 
public:
    using ScalarType = Scalar;
 
    TexCoord() = default;
 
    TexCoord(const Scalar& s1, const Scalar& s2) : mCoord(s1, s2) {}
 
    TexCoord(const Point2<Scalar>& p) : mCoord(p) {}
 
    template<typename S>
    auto cast() const
    {
        if constexpr (std::is_same<Scalar, S>::value) {
            return *this;
        }
        else {
            TexCoord<S> tmp;
            tmp.mCoord = mCoord.template cast<S>();
            return tmp;
        }
    }
 
    Scalar u() const { return mCoord.x(); }
 
    Scalar v() const { return mCoord.y(); }
 
    Scalar& u() { return mCoord.x(); }
 
    Scalar& v() { return mCoord.y(); }
 
    void setU(Scalar s)
    {
        assert(s >= 0 && s <= 1);
        mCoord.x() = s;
    }
 
    void setV(Scalar s)
    {
        assert(s >= 0 && s <= 1);
        mCoord.y() = s;
    }
 
    void set(Scalar u, Scalar v)
    {
        setU(u);
        setV(v);
    }
 
    void serialize(std::ostream& os) const { mCoord.serialize(os); }
 
    void deserialize(std::istream& is) { mCoord.deserialize(is); }
 
    // operators
    Scalar& operator()(uint i) { return mCoord[i]; }
 
    const Scalar& operator()(uint i) const { return mCoord[i]; }
 
    Scalar& operator[](uint i) { return mCoord[i]; }
 
    const Scalar& operator[](uint i) const { return mCoord[i]; }
 
    auto operator<=>(const TexCoord& t1) const = default;
};
 
/* Specialization Aliases */
 
using TexCoordi = TexCoord<int>;
using TexCoordf = TexCoord<float>;
using TexCoordd = TexCoord<double>;
 
/* Concepts */
 
template<typename T>
concept TexCoordConcept = std::derived_from< // same type or derived type
    std::remove_cvref_t<T>,
    TexCoord<typename RemoveRef<T>::ScalarType>>;
 
} // namespace vcl
 
#endif // VCL_SPACE_CORE_TEX_COORD_H