VRS - The Virtual Rendering System

version 3.3

vertexdata.h

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/******************************************************************************
 * VRS - The Virtual Rendering System
 * Copyright (C) 2000-2008 Computer Graphics Systems Group at the 
 * Hasso-Plattner-Institute (HPI), Potsdam, Germany.
 *
 * This  library  is  free  software; you can redistribute it and/or  modify it
 * under the terms of the GNU Lesser General Public  License  as  published  by
 * the  Free  Software  Foundation;  either  version 2.1 of the License, or (at
 * your option) any later version. This library  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 Lesser General Public License for more details. You should have received
 * a copy of the GNU Lesser+ General Public License along with this library; if
 * not, write to the FreeSoftware Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA, 02111-1307, USA.
 ******************************************************************************/

#ifndef VRS_VERTEXDATA_H
#define VRS_VERTEXDATA_H

// for serializationmanager
#include <vrs/sharedobj.h>

#include <cassert>

namespace VRS {

    template<UINT DIM, typename T>
    class VertexData {
    public:
        VertexData() { assert(DIM > 0); init(0, 0, 0, 0); }
        explicit VertexData(T x) { assert(DIM > 0); init(x, 0, 0, 0); }
        VertexData(T x, T y) { assert(DIM > 1); init(x, y, 0, 0); }
        VertexData(T x, T y, T z) { assert(DIM > 2); init(x, y, z, 0); }
        VertexData(T x, T y, T z, T w) { assert(DIM > 3); init(x, y, z, w); }

        bool operator==(const VertexData& other) const {
            // performance remark: this for-loop should be unrolled by the compiler,
            // since DIM is a compile-time constant
            for(UINT i = 0; i < DIM; ++i) {
                if(data_[i] != other.data_[i]) { return false; }
            }
            return true;
        }
        bool operator!=(const VertexData& other) const { return !operator==(other); }

        // implements lexicographic ordering
        bool operator<(const VertexData& other) const {
            // performance remark: this for-loop should be unrolled by the compiler,
            // since DIM is a compile-time constant
            for(UINT i = 0; i < DIM; ++i) {
                if(data_[i] < other.data_[i]) { return true;  }
                if(data_[i] > other.data_[i]) { return false; }
            }
            return false;
        }

        T  operator[](UINT i) const { assert(i < DIM); return data_[i]; }
        T& operator[](UINT i) { assert(i < DIM); return data_[i]; }

        T    get(UINT i)      const { assert(i < DIM); return data_[i]; }
        void set(UINT i, T t) { assert(i < DIM); data_[i] = t; }

        const T* pointer() const { return data_; }
        T* pointer() { return data_; }

        VRS_SERIALIZABLE_NO_SO_CLASS(VertexData);

    private:
        void init(T x, T y, T z, T w) {
            assert(DIM < 5);
            // performance remark: this if-cascade should be optimized away by the compiler,
            // since DIM is a compile-time constant
            if(DIM > 0) { data_[0] = x; }
            if(DIM > 1) { data_[1] = y; }
            if(DIM > 2) { data_[2] = z; }
            if(DIM > 3) { data_[3] = w; }
        }

    protected: // derived classes should have access to the data
        T data_[DIM];
    }; // class VertexData<DIM, T>

    template<UINT DIM, typename T>
    inline void VertexData<DIM, T>::serialize(SerializationManager& doc) {
        if(DIM > 0) { serialization(doc, "X", data_[0], T(0)); }
        if(DIM > 1) { serialization(doc, "Y", data_[1], T(0)); }
        if(DIM > 2) { serialization(doc, "Z", data_[2], T(0)); }
        if(DIM > 3) { serialization(doc, "W", data_[3], T(0)); }
    }

    template<UINT DIM, typename T>
    inline std::ostream& operator<<(std::ostream& out, const VertexData<DIM, T>& vec) {
        if(DIM > 0) { out <<         vec[0]; }
        if(DIM > 1) { out << ", " << vec[1]; }
        if(DIM > 2) { out << ", " << vec[2]; }
        if(DIM > 3) { out << ", " << vec[3]; }
        return out;
    }

} // namespace VRS

#endif // VRS_VERTEXDATA_H

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