135 lines
3.8 KiB
C++
135 lines
3.8 KiB
C++
/* -*-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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