154 lines
5.8 KiB
C++
154 lines
5.8 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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_POINT
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#define OSG_POINT 1
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#include <osg/Vec3>
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#include <osg/StateAttribute>
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#ifndef GL_POINT_SMOOTH
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#define GL_POINT_SMOOTH 0x0B10
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#endif
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namespace osg {
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/** Point - encapsulates the OpenGL point smoothing and size state.*/
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class OSG_EXPORT Point : public StateAttribute
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{
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public :
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Point();
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Point(float size);
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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Point(const Point& point,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
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StateAttribute(point,copyop),
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_size(point._size),
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_fadeThresholdSize(point._fadeThresholdSize),
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_distanceAttenuation(point._distanceAttenuation),
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_minSize(point._minSize),
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_maxSize(point._maxSize) {}
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META_StateAttribute(osg, Point, POINT);
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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_Parameter macros below.
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COMPARE_StateAttribute_Types(Point,sa)
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// compare each parameter in turn against the rhs.
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COMPARE_StateAttribute_Parameter(_size)
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COMPARE_StateAttribute_Parameter(_fadeThresholdSize)
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COMPARE_StateAttribute_Parameter(_distanceAttenuation)
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COMPARE_StateAttribute_Parameter(_minSize)
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COMPARE_StateAttribute_Parameter(_maxSize)
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return 0; // passed all the above comparison macro's, must be equal.
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}
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virtual bool getModeUsage(StateAttribute::ModeUsage& usage) const
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{
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usage.usesMode(GL_POINT_SMOOTH);
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return true;
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}
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void setSize(float size);
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inline float getSize() const { return _size; }
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void setFadeThresholdSize(float fadeThresholdSize);
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inline float getFadeThresholdSize() const { return _fadeThresholdSize; }
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void setDistanceAttenuation(const Vec3& distanceAttenuation);
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inline const Vec3& getDistanceAttenuation() const { return _distanceAttenuation; }
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void setMinSize(float minSize);
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inline float getMinSize() const {return _minSize;}
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void setMaxSize(float maxSize);
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inline float getMaxSize() const {return _maxSize;}
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virtual void apply(State& state) const;
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/** Encapsulates queries of extension availability, obtains extension
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* function pointers, and provides convenience wrappers for
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* calling extension functions. */
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class OSG_EXPORT Extensions : public osg::Referenced
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{
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public:
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Extensions(unsigned int contextID);
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Extensions(const Extensions& rhs);
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void lowestCommonDenominator(const Extensions& rhs);
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void setupGLExtensions(unsigned int contextID);
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void setPointParametersSupported(bool flag) { _isPointParametersSupported=flag; }
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bool isPointParametersSupported() const { return _isPointParametersSupported; }
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void setPointSpriteCoordOriginSupported(bool flag) { _isPointSpriteCoordOriginSupported=flag; }
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bool isPointSpriteCoordOriginSupported() const { return _isPointSpriteCoordOriginSupported; }
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void glPointParameteri(GLenum pname, GLint param) const;
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void glPointParameterf(GLenum pname, GLfloat param) const;
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void glPointParameterfv(GLenum pname, const GLfloat *params) const;
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protected:
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~Extensions() {}
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bool _isPointParametersSupported;
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bool _isPointSpriteCoordOriginSupported;
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typedef void (APIENTRY * GLPointParameteriProc) (GLenum pname, GLint param);
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typedef void (APIENTRY * GLPointParameterfProc) (GLenum pname, GLfloat param);
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typedef void (APIENTRY * GLPointParameterfvProc) (GLenum pname, const GLfloat *params);
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GLPointParameteriProc _glPointParameteri;
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GLPointParameterfProc _glPointParameterf;
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GLPointParameterfvProc _glPointParameterfv;
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};
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/** Returns the Extensions object for the given context.
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* If createIfNotInitalized is true and the Extensions object doesn't
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* exist, getExtensions() creates it on the given context.
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* Returns NULL if createIfNotInitalized is false and the Extensions
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* object doesn't exist. */
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static Extensions* getExtensions(unsigned int contextID,bool createIfNotInitalized);
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/** setExtensions() allows users to override the extensions across graphics contexts.
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* Typically used when you have different extensions supported across graphics pipes,
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* but need to ensure that they all use the same low common denominator extensions. */
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static void setExtensions(unsigned int contextID,Extensions* extensions);
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protected :
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virtual ~Point();
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float _size;
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float _fadeThresholdSize;
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Vec3 _distanceAttenuation;
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float _minSize;
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float _maxSize;
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};
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}
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#endif
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