12226e4371
and passed as paramters into straight forward non const built in types, i.e. const bool foogbar(const int) becomes bool foobar(int).
102 lines
3.3 KiB
Plaintext
102 lines
3.3 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2002 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/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(osg, 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(int x,int y,int width,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 int x() const { return _x; }
|
|
inline int y() const { return _y; }
|
|
inline int width() const { return _width; }
|
|
inline int height() const { return _height; }
|
|
|
|
inline 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 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
|