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137 lines
4.5 KiB
137 lines
4.5 KiB
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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* |
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* This library is open source and may be redistributed and/or modified under |
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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* (at your option) any later version. The full license is in LICENSE file |
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* included with this distribution, and on the openscenegraph.org website. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* OpenSceneGraph Public License for more details. |
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*/ |
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#ifndef OSG_VIEWPORT |
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#define OSG_VIEWPORT 1 |
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#include <osg/StateAttribute> |
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#include <osg/Matrix> |
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namespace osg { |
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/** Encapsulate OpenGL glViewport. */ |
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class OSG_EXPORT Viewport : public StateAttribute |
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{ |
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public : |
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#if 0 |
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typedef int value_type; |
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#else |
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typedef double value_type; |
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#endif |
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Viewport(); |
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Viewport(value_type x,value_type y,value_type width,value_type height): |
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_x(x), |
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_y(y), |
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_width(width), |
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_height(height) {} |
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/** Copy constructor using CopyOp to manage deep vs shallow copy. */ |
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Viewport(const Viewport& vp,const CopyOp& copyop=CopyOp::SHALLOW_COPY): |
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StateAttribute(vp,copyop), |
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_x(vp._x), |
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_y(vp._y), |
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_width(vp._width), |
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_height(vp._height) {} |
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META_StateAttribute(osg, Viewport,VIEWPORT); |
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/** Return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs. */ |
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virtual int compare(const StateAttribute& sa) const |
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{ |
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// check the types are equal and then create the rhs variable |
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// used by the COMPARE_StateAttribute_Parameter macros below. |
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COMPARE_StateAttribute_Types(Viewport,sa) |
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// compare each parameter in turn against the rhs. |
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COMPARE_StateAttribute_Parameter(_x) |
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COMPARE_StateAttribute_Parameter(_y) |
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COMPARE_StateAttribute_Parameter(_width) |
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COMPARE_StateAttribute_Parameter(_height) |
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return 0; // passed all the above comparison macros, must be equal. |
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} |
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inline void setViewport(value_type x,value_type y,value_type width,value_type height) |
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{ |
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_x = x; |
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_y = y; |
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_width = width; |
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_height = height; |
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} |
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#if 0 |
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void getViewport(int& x,int& y,int& width,int& height) const |
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{ |
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x = _x; |
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y = _y; |
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width = _width; |
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height = _height; |
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} |
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void getViewport(double& x,double& y,double& width,double& height) const |
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{ |
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x = _x; |
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y = _y; |
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width = _width; |
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height = _height; |
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} |
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#endif |
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inline value_type& x() { return _x; } |
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inline value_type x() const { return _x; } |
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inline value_type& y() { return _y; } |
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inline value_type y() const { return _y; } |
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inline value_type& width() { return _width; } |
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inline value_type width() const { return _width; } |
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inline value_type& height() { return _height; } |
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inline value_type height() const { return _height; } |
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inline bool valid() const { return _width>0 && _height>0; } |
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/** Return the aspectRatio of the viewport, which is equal to width/height. |
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* If height is zero, the potential division by zero is avoided by simply returning 1.0f. |
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*/ |
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inline double aspectRatio() const { if (_height!=0) return (double)_width/(double)_height; else return 1.0; } |
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/** Compute the Window Matrix which takes projected coords into Window coordinates. |
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* To convert local coordinates into window coordinates use v_window = v_local * MVPW matrix, |
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* where the MVPW matrix is ModelViewMatrix * ProjectionMatrix * WindowMatrix, the latter supplied by |
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* Viewport::computeWindowMatrix(), the ModelView and Projection Matrix can either be sourced from the |
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* current osg::State object, via osgUtil::SceneView or CullVisitor. |
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*/ |
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inline const osg::Matrix computeWindowMatrix() const |
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{ |
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return osg::Matrix::translate(1.0,1.0,1.0)*osg::Matrix::scale(0.5*width(),0.5*height(),0.5f)*osg::Matrix::translate(x(),y(),0.0f); |
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} |
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virtual void apply(State& state) const; |
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protected: |
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virtual ~Viewport(); |
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value_type _x; |
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value_type _y; |
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value_type _width; |
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value_type _height; |
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}; |
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} |
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#endif
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