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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSG_POINTSPRITE
#define OSG_POINTSPRITE 1
#include <osg/GL>
#include <osg/StateAttribute>
#ifndef GL_ARB_point_sprite
#define GL_POINT_SPRITE_ARB 0x8861
#define GL_COORD_REPLACE_ARB 0x8862
#endif
#ifndef GL_POINT_SPRITE_COORD_ORIGIN
#define GL_POINT_SPRITE_COORD_ORIGIN 0x8CA0
#define GL_LOWER_LEFT 0x8CA1
#define GL_UPPER_LEFT 0x8CA2
#endif
namespace osg {
/** PointSprite base class which encapsulates enabling of point sprites .*/
class OSG_EXPORT PointSprite : public osg::StateAttribute {
public:
PointSprite();
/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
PointSprite(const PointSprite& ps,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
StateAttribute(ps,copyop),
_coordOriginMode(ps._coordOriginMode) {}
META_StateAttribute(osg, PointSprite, POINTSPRITE);
/** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
virtual int compare(const StateAttribute& sa) const;
virtual bool getModeUsage(StateAttribute::ModeUsage& usage) const
{
usage.usesMode(GL_POINT_SPRITE_ARB);
return true;
}
virtual bool checkValidityOfAssociatedModes(osg::State&) const;
virtual bool isTextureAttribute() const { return true; }
virtual void apply(osg::State& state) const;
static bool isPointSpriteSupported(unsigned int context);
enum CoordOriginMode {
UPPER_LEFT = GL_UPPER_LEFT,
LOWER_LEFT = GL_LOWER_LEFT
};
inline void setCoordOriginMode(CoordOriginMode mode) { _coordOriginMode = mode; }
inline CoordOriginMode getCoordOriginMode() const { return _coordOriginMode; }
protected:
virtual ~PointSprite();
CoordOriginMode _coordOriginMode;
};
}
#endif