Line data    Source code

       1             : 
       2             : /* Copyright (c) 2006-2015, Stefan Eilemann <eile@equalizergraphics.com>
       3             :  *
       4             :  * This library is free software; you can redistribute it and/or modify it under
       5             :  * the terms of the GNU Lesser General Public License version 2.1 as published
       6             :  * by the Free Software Foundation.
       7             :  *
       8             :  * This library is distributed in the hope that it will be useful, but WITHOUT
       9             :  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
      10             :  * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
      11             :  * details.
      12             :  *
      13             :  * You should have received a copy of the GNU Lesser General Public License
      14             :  * along with this library; if not, write to the Free Software Foundation, Inc.,
      15             :  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
      16             :  */
      17             : 
      18             : #ifndef EQFABRIC_RANGE_H
      19             : #define EQFABRIC_RANGE_H
      20             : 
      21             : #include <eq/fabric/api.h>
      22             : #include <lunchbox/bitOperation.h>
      23             : #include <algorithm> // min,max
      24             : #include <iostream>
      25             : 
      26             : namespace eq
      27             : {
      28             : namespace fabric
      29             : {
      30             : /** A fractional database range with methods for manipulation. */
      31             : class Range
      32             : {
      33             : public:
      34             :     /** @name Constructors */
      35             :     //@{
      36             :     /** Construct a new range covering all data. @version 1.0 */
      37       27796 :     Range() : start(0.f), end(1.f)  {}
      38             : 
      39             :     /** Construct a new range with default values. @version 1.0 */
      40         731 :     Range( const float start_, const float end_ )
      41         731 :         : start(start_), end(end_) {}
      42             :     //@}
      43             : 
      44             :     /** @name Data Access */
      45             :     //@{
      46             :     /** @return true if the two ranges are identical. @version 1.0 */
      47           6 :     bool operator == ( const Range& rhs ) const
      48           6 :         { return start==rhs.start && end==rhs.end; }
      49             : 
      50             :     /** @return true if the two ranges are not identical. @version 1.0 */
      51        2055 :     bool operator != ( const Range& rhs ) const
      52        2055 :         { return start!=rhs.start || end!=rhs.end; }
      53             : 
      54             :     /** @return the interval spanned by this range. @version 1.3 */
      55           0 :     float getSize() const { return end - start; }
      56             : 
      57             :     /** @internal Invalidate the database range. */
      58             :     void invalidate() { start=0.f; end=0.f; }
      59             : 
      60             :     /** @internal @return true if the database range is valid. */
      61        2054 :     bool isValid() const
      62        2054 :         { return ( start>=0.f && end <=1.f && (end - start) >= 0.f ); }
      63             : 
      64             :     /** @internal @return true if the database range covers some data. */
      65           0 :     bool hasData() const { return  (end - start) > 0.f; }
      66             : 
      67             :     /** @internal Apply (accumulate) another database range. */
      68           2 :     void apply( const Range& rhs )
      69             :     {
      70           2 :         const float w = end-start;
      71           2 :         end    = start + rhs.end * w;
      72           2 :         start += rhs.start * w;
      73           2 :     }
      74             : 
      75             :     /** Merge the two ranges (form the union). @version 1.11 */
      76           4 :     void merge( const Range& rhs )
      77             :     {
      78           4 :         start = std::min( start, rhs.start );
      79           4 :         end = std::max( end, rhs.end );
      80           4 :     }
      81             : 
      82             :     float start; //!< The start position
      83             :     float end;   //!< The end position
      84             : 
      85             :     EQFABRIC_API static const Range ALL; //!< A full database range
      86             : };
      87             : 
      88         362 : inline std::ostream& operator << ( std::ostream& os, const Range& range )
      89             : {
      90         362 :     os << "range    [ " << range.start << " " << range.end << " ]";
      91         362 :     return os;
      92             : }
      93             : }
      94             : }
      95             : 
      96             : namespace lunchbox
      97             : {
      98           0 : template<> inline void byteswap( eq::fabric::Range& value )
      99             : {
     100           0 :     byteswap( value.start );
     101           0 :     byteswap( value.end );
     102           0 : }
     103             : }
     104             : #endif // EQFABRIC_RANGE_H