92 lines
2.7 KiB
Plaintext
92 lines
2.7 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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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/StateSet>
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#include <osg/Types>
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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(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(const int x,const int y,const int width,const 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)
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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 const int x() const { return _x; }
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inline const int y() const { return _y; }
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inline const int width() const { return _width; }
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inline const int height() const { return _height; }
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inline const 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 const float aspectRatio() const { if (_height!=0) return (float)_width/(float)_height; else return 1.0f; }
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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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