range.h

/* Copyright (c) 2006-2017, Stefan Eilemann <eile@equalizergraphics.com>
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 2.1 as published
 * by the Free Software Foundation.
 *
 * 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 Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef EQFABRIC_RANGE_H
#define EQFABRIC_RANGE_H

#include <algorithm> // min,max
#include <eq/fabric/api.h>
#include <iostream>
#include <lunchbox/bitOperation.h>

namespace eq
{
namespace fabric
{
class Range
{
public:
    Range()
        : start(0.f)
        , end(1.f)
    {
    }

    Range(const float start_, const float end_)
        : start(start_)
        , end(end_)
    {
    }

    bool operator==(const Range& rhs) const
    {
        return start == rhs.start && end == rhs.end;
    }

    bool operator!=(const Range& rhs) const
    {
        return start != rhs.start || end != rhs.end;
    }

    float getSize() const { return end - start; }
    void invalidate()
    {
        start = 0.f;
        end = 0.f;
    }

    bool isValid() const
    {
        return (start >= 0.f && end <= 1.f && (end - start) >= 0.f);
    }

    bool hasData() const { return (end - start) > 0.f; }
    void apply(const Range& rhs)
    {
        const float w = end - start;
        end = start + rhs.end * w;
        start += rhs.start * w;
    }

    void merge(const Range& rhs)
    {
        start = std::min(start, rhs.start);
        end = std::max(end, rhs.end);
    }

    float start; 
    float end;   

    EQFABRIC_API static const Range ALL; 
};

inline std::ostream& operator<<(std::ostream& os, const Range& range)
{
    os << "range    [ " << range.start << " " << range.end << " ]";
    return os;
}
}
}

#endif // EQFABRIC_RANGE_H