[space] Add TexCoordIndexed class

vclib/core/include/vclib/space/core.h

@@ -37,6 +37,7 @@
 #include "core/segment.h"
 #include "core/sphere.h"
 #include "core/tex_coord.h"
+#include "core/tex_coord_indexed.h"
 #include "core/texture.h"
 #include "core/triangle_wrapper.h"
 #include "core/vector.h"

vclib/core/include/vclib/space/core/tex_coord_indexed.h

@@ -0,0 +1,107 @@
+/*****************************************************************************
+ * 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_INDEXED_H
+#define VCL_SPACE_CORE_TEX_COORD_INDEXED_H
+
+#include "tex_coord.h"
+
+namespace vcl {
+
+/**
+ * @brief The TexCoordIndexed class represents a texture coordinate with an
+ * index.
+ *
+ * The TexCoordIndexed class represents a texture coordinate with an index. The
+ * class is a specialization of the TexCoord class template, where the two
+ * components of the texture coordinate are named `u` and `v`. The class adds
+ * an index member variable that represents the index of the texture coordinate.
+ *
+ * @tparam Scalar: The scalar type of the texture coordinate components.
+ *
+ * @ingroup space_core
+ */
+template<typename Scalar>
+class TexCoordIndexed : public TexCoord<Scalar>
+{
+    using Base = TexCoord<Scalar>;
+
+    ushort mIndex = 0;
+
+public:
+    using Base::Base;
+
+    using Base::operator();
+    using Base::operator[];
+
+    TexCoordIndexed() = default;
+
+    TexCoordIndexed(const Base& base, ushort index) : Base(base), mIndex(index)
+    {
+    }
+
+    TexCoordIndexed(const Scalar& s1, const Scalar& s2, ushort index) :
+            Base(s1, s2), mIndex(index)
+    {
+    }
+
+    TexCoordIndexed(const Point2<Scalar>& p, ushort index) :
+            Base(p), mIndex(index)
+    {
+    }
+
+    template<typename S>
+    auto cast() const
+    {
+        if constexpr (std::is_same<Scalar, S>::value) {
+            return *this;
+        }
+        else {
+            TexCoordIndexed<S> tmp = Base::template cast<S>();
+            tmp.mIndex = mIndex;
+            return tmp;
+        }
+    }
+
+    ushort index() const { return mIndex; }
+
+    ushort& index() { return mIndex; }
+
+    void serialize(std::ostream& os) const
+    {
+        Base::serialize(os);
+        vcl::serialize(os, mIndex);
+    }
+
+    void deserialize(std::istream& is)
+    {
+        Base::deserialize(is);
+        vcl::deserialize(is, mIndex);
+    }
+
+    // operators
+    auto operator<=>(const TexCoordIndexed& t1) const = default;
+};
+
+} // namespace vcl
+
+#endif // VCL_SPACE_CORE_TEX_COORD_INDEXED_H