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78 lines
3.1 KiB
78 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 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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inline osg::IndexArray *getIndices() { return indices_.get(); } |
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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(osg::PrimitiveSet *pset, |
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const osg::Array *vx, |
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const osg::Array *nx, |
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const osg::Array *tx, |
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int iA, int iB, int iC); |
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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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osg::ref_ptr<osg::UIntArray> indices_; |
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}; |
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} |
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#endif
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