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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_BLENDCOLOR
#define OSG_BLENDCOLOR 1
#include <osg/GL>
#include <osg/StateAttribute>
#include <osg/ref_ptr>
#include <osg/Vec4>
namespace osg {
/** Encapsulates OpenGL blend/transparency state. */
class OSG_EXPORT BlendColor : public StateAttribute
{
public :
BlendColor();
BlendColor(const osg::Vec4& constantColor);
/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
BlendColor(const BlendColor& trans,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
StateAttribute(trans,copyop),
_constantColor(trans._constantColor) {}
META_StateAttribute(osg, BlendColor,BLENDCOLOR);
/** Return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs. */
virtual int compare(const StateAttribute& sa) const
{
// Check for equal types, then create the rhs variable
// used by the COMPARE_StateAttribute_Parameter macros below.
COMPARE_StateAttribute_Types(BlendColor,sa)
// Compare each parameter in turn against the rhs.
COMPARE_StateAttribute_Parameter(_constantColor)
return 0; // Passed all the above comparison macros, so must be equal.
}
virtual bool getModeUsage(StateAttribute::ModeUsage& usage) const
{
usage.usesMode(GL_BLEND);
return true;
}
void setConstantColor(const osg::Vec4& color) { _constantColor = color; }
inline osg::Vec4& getConstantColor() { return _constantColor; }
inline const osg::Vec4& getConstantColor() const { return _constantColor; }
virtual void apply(State& state) const;
protected :
virtual ~BlendColor();
osg::Vec4 _constantColor;
};
}
#endif
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