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134 lines
3.8 KiB
134 lines
3.8 KiB
/* -*-c++-*- |
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* Copyright (C) 2008 Cedric Pinson <cedric.pinson@plopbyte.net> |
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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 OSGANIMATION_TARGET |
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#define OSGANIMATION_TARGET 1 |
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#include <vector> |
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#include <osg/Quat> |
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#include <osg/Vec3> |
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#include <osg/Vec2> |
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#include <osg/Vec4> |
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#include <osg/Referenced> |
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#include <osgAnimation/Export> |
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namespace osgAnimation |
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{ |
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class Channel; |
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class OSGANIMATION_EXPORT Target : public osg::Referenced |
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{ |
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public: |
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Target(); |
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virtual ~Target() {} |
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void reset() { _weight = 0; _priorityWeight = 0; } |
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int getCount() const { return referenceCount(); } |
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float getWeight() const { return _weight; } |
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protected: |
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float _weight; |
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float _priorityWeight; |
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int _lastPriority; |
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}; |
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template <class T> |
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class TemplateTarget : public Target |
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{ |
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public: |
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TemplateTarget() : _target() {} |
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TemplateTarget(const T& v) { setValue(v); } |
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TemplateTarget(const TemplateTarget& v) { setValue(v.getValue()); } |
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inline void lerp(float t, const T& a, const T& b); |
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/** |
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* The priority is used to detect a change of priority |
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* It's important to update animation target in priority |
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* order. eg: |
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* all animation with priority 1 |
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* all animation with priority 0 |
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* all animation with priority -1 |
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* ... |
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*/ |
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void update(float weight, const T& val, int priority) |
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{ |
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if (_weight || _priorityWeight) |
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{ |
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if (_lastPriority != priority) |
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{ |
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// change in priority |
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// add to weight with the same previous priority cumulated weight |
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_weight += _priorityWeight * (1.0 - _weight); |
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_priorityWeight = 0; |
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_lastPriority = priority; |
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} |
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_priorityWeight += weight; |
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float t = (1.0 - _weight) * weight / _priorityWeight; |
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lerp(t, _target, val); |
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} |
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else |
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{ |
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_priorityWeight = weight; |
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_lastPriority = priority; |
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_target = val; |
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} |
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} |
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const T& getValue() const { return _target; } |
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void setValue(const T& value) { _target = value; } |
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protected: |
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T _target; |
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}; |
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template <class T> |
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inline void TemplateTarget<T>::lerp(float t, const T& a, const T& b) |
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{ |
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_target = a * (1.0f - t) + b * t; |
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} |
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template <> |
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inline void TemplateTarget<osg::Quat>::lerp(float t, const osg::Quat& a, const osg::Quat& b) |
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{ |
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if (a.asVec4() * b.asVec4() < 0.0) |
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{ |
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_target = a * (1.0f - t) + b * -t; |
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} |
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else |
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{ |
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_target = a * (1.0f - t) + b * t; |
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} |
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osg::Quat::value_type len2 = _target.length2(); |
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if ( len2 != 1.0 && len2 != 0.0) |
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_target *= 1.0/sqrt(len2); |
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} |
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typedef TemplateTarget<osg::Matrixf> MatrixTarget; |
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typedef TemplateTarget<osg::Quat> QuatTarget; |
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typedef TemplateTarget<osg::Vec3> Vec3Target; |
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typedef TemplateTarget<osg::Vec4> Vec4Target; |
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typedef TemplateTarget<osg::Vec2> Vec2Target; |
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typedef TemplateTarget<float> FloatTarget; |
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typedef TemplateTarget<double> DoubleTarget; |
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} |
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#endif
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