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OpenSceneGraph/include/osgAnimation/Interpolator
Robert Osfield 138ea0e0c7 From Pjotr Svetachov, "For a scene with a lot of animated agents I did some small 
optimizations to reduce cpu overhead:
1) Avoid a load-hit-store in UpdateBone. b->getMatrixInBoneSpace()
returns the same matrix that was just stored with b->setMatrix()
2) Avoid calling element->isIdentity() for the whole transform stack
(can be expensive is element is a matrix)
3) Make the key frame interpolator use binary search instead of a
linear one. This is very noticeable in scenes where some geometry has
long repeating animations that start at the same time, you will see
the update time grow then reset and grow again."


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@14294 16af8721-9629-0410-8352-f15c8da7e697
2014-06-26 10:45:07 +00:00

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/* -*-c++-*-
* Copyright (C) 2008 Cedric Pinson <cedric.pinson@plopbyte.net>
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*
* Authors:
* Cedric Pinson <cedric.pinson@plopbyte.net>
* Michael Platings <mplatings@pixelpower.com>
*/
#ifndef OSGANIMATION_INTERPOLATOR
#define OSGANIMATION_INTERPOLATOR 1
#include <osg/Notify>
#include <osgAnimation/Keyframe>
namespace osgAnimation
{
template <class TYPE, class KEY>
class TemplateInterpolatorBase
{
public:
typedef KEY KeyframeType;
typedef TYPE UsingType;
public:
TemplateInterpolatorBase() {}
int getKeyIndexFromTime(const TemplateKeyframeContainer<KEY>& keys, double time) const
{
int key_size = keys.size();
if (!key_size) {
osg::notify(osg::WARN) << "TemplateInterpolatorBase::getKeyIndexFromTime the container is empty, impossible to get key index from time" << std::endl;;
return -1;
}
const TemplateKeyframe<KeyframeType>* keysVector = &keys.front();
int k = 0;
int l = key_size;
int mid = key_size/2;
while(mid != k){
double time1 = keysVector[mid].getTime();
if(time1 < time){
k = mid;
} else {
l = mid;
}
mid = (l+k)/2;
}
return k;
}
};
template <class TYPE, class KEY=TYPE>
class TemplateStepInterpolator : public TemplateInterpolatorBase<TYPE,KEY>
{
public:
TemplateStepInterpolator() {}
void getValue(const TemplateKeyframeContainer<KEY>& keyframes, double time, TYPE& result) const
{
if (time >= keyframes.back().getTime())
{
result = keyframes.back().getValue();
return;
}
else if (time <= keyframes.front().getTime())
{
result = keyframes.front().getValue();
return;
}
int i = this->getKeyIndexFromTime(keyframes,time);
result = keyframes[i].getValue();
}
};
template <class TYPE, class KEY=TYPE>
class TemplateLinearInterpolator : public TemplateInterpolatorBase<TYPE,KEY>
{
public:
TemplateLinearInterpolator() {}
void getValue(const TemplateKeyframeContainer<KEY>& keyframes, double time, TYPE& result) const
{
if (time >= keyframes.back().getTime())
{
result = keyframes.back().getValue();
return;
}
else if (time <= keyframes.front().getTime())
{
result = keyframes.front().getValue();
return;
}
int i = this->getKeyIndexFromTime(keyframes,time);
float blend = (time - keyframes[i].getTime()) / ( keyframes[i+1].getTime() - keyframes[i].getTime());
const TYPE& v1 = keyframes[i].getValue();
const TYPE& v2 = keyframes[i+1].getValue();
result = v1*(1-blend) + v2*blend;
}
};
template <class TYPE, class KEY=TYPE>
class TemplateSphericalLinearInterpolator : public TemplateInterpolatorBase<TYPE,KEY>
{
public:
TemplateSphericalLinearInterpolator() {}
void getValue(const TemplateKeyframeContainer<KEY>& keyframes, double time, TYPE& result) const
{
if (time >= keyframes.back().getTime())
{
result = keyframes.back().getValue();
return;
}
else if (time <= keyframes.front().getTime())
{
result = keyframes.front().getValue();
return;
}
int i = this->getKeyIndexFromTime(keyframes,time);
float blend = (time - keyframes[i].getTime()) / ( keyframes[i+1].getTime() - keyframes[i].getTime());
const TYPE& q1 = keyframes[i].getValue();
const TYPE& q2 = keyframes[i+1].getValue();
result.slerp(blend,q1,q2);
}
};
template <class TYPE, class KEY>
class TemplateLinearPackedInterpolator : public TemplateInterpolatorBase<TYPE,KEY>
{
public:
TemplateLinearPackedInterpolator() {}
void getValue(const TemplateKeyframeContainer<KEY>& keyframes, double time, TYPE& result) const
{
if (time >= keyframes.back().getTime())
{
keyframes.back().getValue().uncompress(keyframes.mScale, keyframes.mMin, result);
return;
}
else if (time <= keyframes.front().getTime())
{
keyframes.front().getValue().uncompress(keyframes.mScale, keyframes.mMin, result);
return;
}
int i = this->getKeyIndexFromTime(keyframes,time);
float blend = (time - keyframes[i].getTime()) / ( keyframes[i+1].getTime() - keyframes[i].getTime());
TYPE v1,v2;
keyframes[i].getValue().uncompress(keyframes.mScale, keyframes.mMin, v1);
keyframes[i+1].getValue().uncompress(keyframes.mScale, keyframes.mMin, v2);
result = v1*(1-blend) + v2*blend;
}
};
// http://en.wikipedia.org/wiki/B%C3%A9zier_curve
template <class TYPE, class KEY=TYPE>
class TemplateCubicBezierInterpolator : public TemplateInterpolatorBase<TYPE,KEY>
{
public:
TemplateCubicBezierInterpolator() {}
void getValue(const TemplateKeyframeContainer<KEY>& keyframes, double time, TYPE& result) const
{
if (time >= keyframes.back().getTime())
{
result = keyframes.back().getValue().getPosition();
return;
}
else if (time <= keyframes.front().getTime())
{
result = keyframes.front().getValue().getPosition();
return;
}
int i = this->getKeyIndexFromTime(keyframes,time);
float t = (time - keyframes[i].getTime()) / ( keyframes[i+1].getTime() - keyframes[i].getTime());
float one_minus_t = 1.0-t;
float one_minus_t2 = one_minus_t * one_minus_t;
float one_minus_t3 = one_minus_t2 * one_minus_t;
float t2 = t * t;
TYPE v0 = keyframes[i].getValue().getPosition() * one_minus_t3;
TYPE v1 = keyframes[i].getValue().getControlPointIn() * (3.0 * t * one_minus_t2);
TYPE v2 = keyframes[i].getValue().getControlPointOut() * (3.0 * t2 * one_minus_t);
TYPE v3 = keyframes[i+1].getValue().getPosition() * (t2 * t);
result = v0 + v1 + v2 + v3;
}
};
typedef TemplateStepInterpolator<double, double> DoubleStepInterpolator;
typedef TemplateStepInterpolator<float, float> FloatStepInterpolator;
typedef TemplateStepInterpolator<osg::Vec2, osg::Vec2> Vec2StepInterpolator;
typedef TemplateStepInterpolator<osg::Vec3, osg::Vec3> Vec3StepInterpolator;
typedef TemplateStepInterpolator<osg::Vec3, Vec3Packed> Vec3PackedStepInterpolator;
typedef TemplateStepInterpolator<osg::Vec4, osg::Vec4> Vec4StepInterpolator;
typedef TemplateStepInterpolator<osg::Quat, osg::Quat> QuatStepInterpolator;
typedef TemplateLinearInterpolator<double, double> DoubleLinearInterpolator;
typedef TemplateLinearInterpolator<float, float> FloatLinearInterpolator;
typedef TemplateLinearInterpolator<osg::Vec2, osg::Vec2> Vec2LinearInterpolator;
typedef TemplateLinearInterpolator<osg::Vec3, osg::Vec3> Vec3LinearInterpolator;
typedef TemplateLinearInterpolator<osg::Vec3, Vec3Packed> Vec3PackedLinearInterpolator;
typedef TemplateLinearInterpolator<osg::Vec4, osg::Vec4> Vec4LinearInterpolator;
typedef TemplateSphericalLinearInterpolator<osg::Quat, osg::Quat> QuatSphericalLinearInterpolator;
typedef TemplateLinearInterpolator<osg::Matrixf, osg::Matrixf> MatrixLinearInterpolator;
typedef TemplateCubicBezierInterpolator<float, FloatCubicBezier > FloatCubicBezierInterpolator;
typedef TemplateCubicBezierInterpolator<double, DoubleCubicBezier> DoubleCubicBezierInterpolator;
typedef TemplateCubicBezierInterpolator<osg::Vec2, Vec2CubicBezier> Vec2CubicBezierInterpolator;
typedef TemplateCubicBezierInterpolator<osg::Vec3, Vec3CubicBezier> Vec3CubicBezierInterpolator;
typedef TemplateCubicBezierInterpolator<osg::Vec4, Vec4CubicBezier> Vec4CubicBezierInterpolator;
}
#endif
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