103 lines
3.4 KiB
Plaintext
103 lines
3.4 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
|
|
//Distributed under the terms of the GNU Library General Public License (LGPL)
|
|
//as published by the Free Software Foundation.
|
|
|
|
#ifndef OSG_VIEWPORT
|
|
#define OSG_VIEWPORT 1
|
|
|
|
#include <osg/StateAttribute>
|
|
#include <osg/StateSet>
|
|
#include <osg/Types>
|
|
#include <osg/Matrix>
|
|
|
|
namespace osg {
|
|
|
|
/** Encapsulte OpenGL glViewport.
|
|
*/
|
|
class SG_EXPORT Viewport : public StateAttribute
|
|
{
|
|
public :
|
|
|
|
|
|
Viewport();
|
|
|
|
/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
|
|
Viewport(const Viewport& vp,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
|
|
StateAttribute(vp,copyop),
|
|
_x(vp._x),
|
|
_y(vp._y),
|
|
_width(vp._width),
|
|
_height(vp._height) {}
|
|
|
|
META_StateAttribute(Viewport,VIEWPORT);
|
|
|
|
/** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
|
|
virtual int compare(const StateAttribute& sa) const
|
|
{
|
|
// check the types are equal and then create the rhs variable
|
|
// used by the COMPARE_StateAttribute_Paramter macro's below.
|
|
COMPARE_StateAttribute_Types(Viewport,sa)
|
|
|
|
// compare each paramter in turn against the rhs.
|
|
COMPARE_StateAttribute_Parameter(_x)
|
|
COMPARE_StateAttribute_Parameter(_y)
|
|
COMPARE_StateAttribute_Parameter(_width)
|
|
COMPARE_StateAttribute_Parameter(_height)
|
|
|
|
return 0; // passed all the above comparison macro's, must be equal.
|
|
}
|
|
|
|
inline void setViewport(const int x,const int y,const int width,const int height)
|
|
{
|
|
_x = x;
|
|
_y = y;
|
|
_width = width;
|
|
_height = height;
|
|
}
|
|
|
|
void getViewport(int& x,int& y,int& width,int& height) const
|
|
{
|
|
x = _x;
|
|
y = _y;
|
|
width = _width;
|
|
height = _height;
|
|
}
|
|
|
|
inline const int x() const { return _x; }
|
|
inline const int y() const { return _y; }
|
|
inline const int width() const { return _width; }
|
|
inline const int height() const { return _height; }
|
|
|
|
inline const bool valid() const { return _width!=0 && _height!=0; }
|
|
|
|
/** Return the aspcetRatio of the viewport, which is equal to width/height.
|
|
* If height is zero, the potental division by zero is avoid by simply returning 1.0f.*/
|
|
inline const float aspectRatio() const { if (_height!=0) return (float)_width/(float)_height; else return 1.0f; }
|
|
|
|
/** Compute the Window Matrix which takes projected coords into Window coordinates.
|
|
* To converted local coodinates into window coordinates use v_window = v_local * MVPW matrix,
|
|
* where the MVPW matrix is ModelViewMatrix * ProjectionMatrix * WindowMatrix, the later supplied by
|
|
* viewport::computeWindowMatrix(), the ModelView and Projection Matrix can either be sourced from the
|
|
* current osg::State object, via osgUtil::SceneView or CullVisitor.*/
|
|
inline const osg::Matrix computeWindowMatrix() const
|
|
{
|
|
return osg::Matrix::translate(1.0f,1.0f,1.0f)*osg::Matrix::scale(0.5f*width(),0.5f*height(),0.5f);
|
|
}
|
|
|
|
virtual void apply(State& state) const;
|
|
|
|
protected:
|
|
|
|
virtual ~Viewport();
|
|
|
|
int _x;
|
|
int _y;
|
|
int _width;
|
|
int _height;
|
|
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|