Equalizer  1.2.1
viewport.h
00001 
00002 /* Copyright (c) 2006-2010, Stefan Eilemann <eile@equalizergraphics.com> 
00003  *
00004  * This library is free software; you can redistribute it and/or modify it under
00005  * the terms of the GNU Lesser General Public License version 2.1 as published
00006  * by the Free Software Foundation.
00007  *  
00008  * This library is distributed in the hope that it will be useful, but WITHOUT
00009  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
00010  * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
00011  * details.
00012  * 
00013  * You should have received a copy of the GNU Lesser General Public License
00014  * along with this library; if not, write to the Free Software Foundation, Inc.,
00015  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00016  */
00017 
00018 #ifndef EQFABRIC_VIEWPORT_H
00019 #define EQFABRIC_VIEWPORT_H
00020 
00021 #include <eq/fabric/api.h>
00022 #include <eq/fabric/types.h>
00023 #include <co/base/debug.h>
00024 
00025 #include <iostream>
00026 
00027 namespace eq
00028 {
00029 namespace fabric
00030 {
00031     class PixelViewport;
00032     class Viewport;
00033     std::ostream& operator << ( std::ostream& os, const Viewport& vp );
00034 
00036     class Viewport 
00037     {
00038     public:
00042         Viewport() : x(0.0f), y(0.0f), w(1.0f), h(1.0f)  {}
00043 
00045         Viewport( const float x_, const float y_, const float w_,const float h_)
00046                 : x(x_), y(y_), w(w_), h(h_)  {}
00048 
00050         void invalidate() { x=0.0f; y=0.0f; w=-1.0f; h=-1.0f; }
00051 
00053         void apply( const Viewport& rhs )
00054             {
00055                 EQASSERTINFO( isValid(), *this);
00056                 EQASSERTINFO( rhs.isValid(), rhs );                
00057                 x += rhs.x * w;
00058                 y += rhs.y * h;
00059                 w *= rhs.w;
00060                 h *= rhs.h;
00061             }
00062             
00064         void transform( const Viewport& rhs )
00065             {
00066                 w = w / rhs.w;
00067                 h = h / rhs.h;
00068                 x = ( x - rhs.x ) / rhs.w;
00069                 y = ( y - rhs.y ) / rhs.h;
00070             }
00071 
00076         bool operator == ( const Viewport& rhs ) const 
00077             { 
00078                 return ( x==rhs.x && y==rhs.y && w==rhs.w && h==rhs.h);
00079             }
00080 
00085         bool operator != ( const Viewport& rhs ) const 
00086             { 
00087                 return ( x!=rhs.x || y!=rhs.y || w!=rhs.w || h!=rhs.h);
00088             }
00089 
00095         bool isValid() const 
00096             { return ( x>=0.0f && y>=0.0f && w>=0.0f && h>=0.0f ); }
00097         
00103         bool hasArea() const { return (w>0.0f && h>0.0f); }
00104 
00106         float getArea() const { return w*h; }
00107 
00109         float getXEnd() const { return x+w; }
00110 
00112         float getYEnd() const { return y+h; }
00113 
00115         void intersect( const Viewport& rhs )
00116             {
00117                 if( *this == rhs )
00118                     return;
00119 
00120                 if( !rhs.isValid() || !isValid() )
00121                 {
00122                     invalidate();
00123                     return;
00124                 }
00125                 
00126                 if( !rhs.hasArea() || !hasArea() )
00127                 {
00128                     x = 0;
00129                     y = 0;
00130                     w = 0;
00131                     h = 0;
00132                     return;
00133                 }
00134                 
00135                 const float sEx = static_cast< float >(     x +     w );
00136                 const float sEy = static_cast< float >(     y +     h );
00137                 const float dEx = static_cast< float >( rhs.x + rhs.w );
00138                 const float dEy = static_cast< float >( rhs.y + rhs.h );
00139                     
00140                 x = EQ_MAX( x, rhs.x );
00141                 y = EQ_MAX( y, rhs.y );
00142                 w = EQ_MIN( sEx, dEx ) - x;
00143                 h = EQ_MIN( sEy, dEy ) - y;
00144             }
00145 
00147         void unite( const Viewport& rhs )
00148             {
00149                 const float xEnd = EQ_MAX( getXEnd(), rhs.getXEnd( ));
00150                 const float yEnd = EQ_MAX( getYEnd(), rhs.getYEnd( ));
00151                 x = EQ_MIN( x, rhs.x );
00152                 y = EQ_MIN( y, rhs.y );
00153                 w = xEnd - x;
00154                 h = yEnd - y;
00155             }
00156 
00161         Viewport getCoverage( const Viewport& with ) const
00162             {
00163                 Viewport coverage( with );
00164                 coverage.intersect( *this ); // intersection
00165                 coverage.transform( *this ); // in our coordinate system
00166 
00167                 return coverage;
00168             }
00169 
00171         EQFABRIC_API void applyView( const Viewport& segmentVP,
00172                                   const Viewport& viewVP,
00173                                   const PixelViewport& pvp, 
00174                                   const Vector4i& overdraw );
00175 
00176         float x; 
00177         float y; 
00178         float w; 
00179         float h; 
00180 
00181         EQFABRIC_API static const Viewport FULL; 
00182     };
00183 
00184     inline std::ostream& operator << ( std::ostream& os, const Viewport& vp )
00185     {
00186         os << "[ " << vp.x << " " << vp.y << " " << vp.w << " " << vp.h << " ]";
00187         return os;
00188     }
00189 }
00190 }
00191 
00192 #endif // EQFABRIC_VIEWPORT_H
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