72 lines
2.9 KiB
C++
72 lines
2.9 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 OSGUTIL_TANGENTSPACEGENERATOR_
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#define OSGUTIL_TANGENTSPACEGENERATOR_
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#include <osgUtil/Export>
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#include <osg/ref_ptr>
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#include <osg/Referenced>
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#include <osg/Array>
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#include <osg/Geometry>
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namespace osgUtil
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{
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/**
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The TangentSpaceGenerator class generates three arrays containing tangent-space basis vectors.
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It takes a texture-mapped Geometry object as input, traverses its primitive sets and computes
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Tangent, Normal and Binormal vectors for each vertex, storing them into arrays.
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The resulting arrays can be used as vertex program varying (per-vertex) parameters,
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enabling advanced effects like bump-mapping.
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To use this class, simply call the generate() method specifying the Geometry object
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you want to process and the texture unit that contains UV mapping for the normal map;
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then you can retrieve the TBN arrays by calling getTangentArray(), getNormalArray()
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and getBinormalArray() methods.
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*/
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class OSGUTIL_EXPORT TangentSpaceGenerator: public osg::Referenced {
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public:
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TangentSpaceGenerator();
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TangentSpaceGenerator(const TangentSpaceGenerator ©, const osg::CopyOp ©op = osg::CopyOp::SHALLOW_COPY);
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void generate(osg::Geometry *geo, int normal_map_tex_unit = 0);
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inline osg::Vec4Array *getTangentArray() { return T_.get(); }
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inline const osg::Vec4Array *getTangentArray() const { return T_.get(); }
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inline void setTangentArray(osg::Vec4Array *array) { T_ = array; }
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inline osg::Vec4Array *getNormalArray() { return N_.get(); }
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inline const osg::Vec4Array *getNormalArray() const { return N_.get(); }
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inline void setNormalArray(osg::Vec4Array *array) { N_ = array; }
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inline osg::Vec4Array *getBinormalArray() { return B_.get(); }
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inline const osg::Vec4Array *getBinormalArray() const { return B_.get(); }
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inline void setBinormalArray(osg::Vec4Array *array) { B_ = array; }
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protected:
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virtual ~TangentSpaceGenerator() {}
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TangentSpaceGenerator &operator=(const TangentSpaceGenerator &) { return *this; }
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void compute_basis_vectors(osg::PrimitiveSet *pset, const osg::Array *vx, const osg::Array *nx, const osg::Array *tx, int iA, int iB, int iC);
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private:
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osg::ref_ptr<osg::Vec4Array> T_;
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osg::ref_ptr<osg::Vec4Array> B_;
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osg::ref_ptr<osg::Vec4Array> N_;
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};
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}
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#endif
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