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