92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 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_ALPHAFUNC
|
|
#define OSG_ALPHAFUNC 1
|
|
|
|
#include <osg/StateAttribute>
|
|
|
|
namespace osg {
|
|
|
|
/** Encapsulate OpenGL glAlphaFunc.
|
|
*/
|
|
class SG_EXPORT AlphaFunc : public StateAttribute
|
|
{
|
|
public :
|
|
|
|
|
|
AlphaFunc();
|
|
|
|
/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
|
|
AlphaFunc(const AlphaFunc& af,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
|
|
StateAttribute(af,copyop),
|
|
_comparisonFunc(af._comparisonFunc),
|
|
_referenceValue(af._referenceValue) {}
|
|
|
|
META_StateAttribute(osg, AlphaFunc,ALPHAFUNC);
|
|
|
|
/** 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(AlphaFunc,sa)
|
|
|
|
// compare each paramter in turn against the rhs.
|
|
COMPARE_StateAttribute_Parameter(_comparisonFunc)
|
|
COMPARE_StateAttribute_Parameter(_referenceValue)
|
|
|
|
return 0; // passed all the above comparison macro's, must be equal.
|
|
}
|
|
|
|
virtual void getAssociatedModes(std::vector<GLMode>& modes) const
|
|
{
|
|
modes.push_back(GL_ALPHA_TEST);
|
|
}
|
|
|
|
enum ComparisonFunction {
|
|
NEVER = GL_NEVER,
|
|
LESS = GL_LESS,
|
|
EQUAL = GL_EQUAL,
|
|
LEQUAL = GL_LEQUAL,
|
|
GREATER = GL_GREATER,
|
|
NOTEQUAL = GL_NOTEQUAL,
|
|
GEQUAL = GL_GEQUAL,
|
|
ALWAYS = GL_ALWAYS
|
|
};
|
|
|
|
inline void setFunction(ComparisonFunction func,float ref)
|
|
{
|
|
_comparisonFunc = func;
|
|
_referenceValue = ref;
|
|
}
|
|
|
|
inline ComparisonFunction getFunction() const { return _comparisonFunc; }
|
|
|
|
inline float getReferenceValue() const { return _referenceValue; }
|
|
|
|
virtual void apply(State& state) const;
|
|
|
|
protected:
|
|
|
|
virtual ~AlphaFunc();
|
|
|
|
ComparisonFunction _comparisonFunc;
|
|
float _referenceValue;
|
|
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|