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102 lines
3.1 KiB
102 lines
3.1 KiB
/* -*-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_ALPHAFUNC |
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#define OSG_ALPHAFUNC 1 |
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#include <osg/StateAttribute> |
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#ifndef GL_ALPHA_TEST |
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#define GL_ALPHA_TEST 0x0BC0 |
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#endif |
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namespace osg { |
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/** Encapsulates OpenGL glAlphaFunc. |
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*/ |
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class OSG_EXPORT AlphaFunc : public StateAttribute |
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{ |
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public : |
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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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AlphaFunc(); |
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AlphaFunc(ComparisonFunction func,float ref): |
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_comparisonFunc(func), |
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_referenceValue(ref) {} |
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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 for equal types, then create the rhs variable |
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// used by the COMPARE_StateAttribute_Parameter macros below. |
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COMPARE_StateAttribute_Types(AlphaFunc,sa) |
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// Compare each parameter 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 macros, so 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_ALPHA_TEST); |
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return true; |
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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 void setFunction(ComparisonFunction func) { _comparisonFunc=func; } |
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inline ComparisonFunction getFunction() const { return _comparisonFunc; } |
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inline void setReferenceValue(float value) { _referenceValue=value; } |
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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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