8f1ba9d21b
any reference to these in the distribution across to using unsigned char, unsigned short etc. This has been done to keep the OSG code more opaque to what types are.
110 lines
3.7 KiB
C++
110 lines
3.7 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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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/** Encapsulte OpenGL glViewport.
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*/
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class SG_EXPORT Viewport : public StateAttribute
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{
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public :
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Viewport();
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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_Paramter macro's below.
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COMPARE_StateAttribute_Types(Viewport,sa)
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// compare each paramter 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 macro's, must be equal.
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}
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inline void setViewport(int x,int y,int width,int 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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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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inline int x() const { return _x; }
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inline int y() const { return _y; }
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inline int width() const { return _width; }
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inline int height() const { return _height; }
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inline bool valid() const { return _width!=0 && _height!=0; }
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/** Return the aspcetRatio of the viewport, which is equal to width/height.
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* If height is zero, the potental division by zero is avoid by simply returning 1.0f.*/
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inline float aspectRatio() const { if (_height!=0) return (float)_width/(float)_height; else return 1.0f; }
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/** Compute the Window Matrix which takes projected coords into Window coordinates.
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* To converted local coodinates into window coordinates use v_window = v_local * MVPW matrix,
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* where the MVPW matrix is ModelViewMatrix * ProjectionMatrix * WindowMatrix, the later 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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inline const osg::Matrix computeWindowMatrix() const
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{
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return osg::Matrix::translate(1.0f,1.0f,1.0f)*osg::Matrix::scale(0.5f*width(),0.5f*height(),0.5f);
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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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int _x;
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int _y;
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int _width;
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int _height;
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};
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}
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#endif
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