116 lines
3.9 KiB
C++
116 lines
3.9 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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/** Encapsulate OpenGL glViewport. */
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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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Viewport(int x,int y,int width,int 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_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 aspectRatio of the viewport, which is equal to width/height.
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* If height is zero, the potental division by zero is avoided by simply returning 1.0f.
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*/
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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 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(1.0f,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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