ControlPoint Path::getPositionForTime(float t) {
// init return value //
ControlPoint P(0,0,0,t);
// check if t is within bounds //
if (mControlPoints.size() < 4) {
std::cerr << "(Path::getPositionForTime) - Not enough control points given!" << std::endl;
return P;
}
if (t < mControlPoints.at(1).time) {
if (isLooped()) {
while (t < mControlPoints.at(1).time) t += mControlPoints.at(mControlPoints.size() - 2).time;
} else {
std::cerr << "(Path::getPositionForTime) - Warning: t = " << t << " exceeds path definition. Path begins at: t = " << mControlPoints.at(1).time << std::endl;
t = mControlPoints.at(1).time;
}
}
if (t > mControlPoints.at(mControlPoints.size() - 2).time) {
if (isLooped()) {
while (t > mControlPoints.at(mControlPoints.size() - 2).time) t -= mControlPoints.at(mControlPoints.size() - 2).time;
} else {
std::cerr << "(Path::getPositionForTime) - Warning: t = " << t << " exceeds path definition. Path ends at: t = " << mControlPoints.at(mControlPoints.size() - 2).time << std::endl;
t = mControlPoints.at(mControlPoints.size() - 2).time;
}
}
// get correct set of control point segment for t //
std::vector<ControlPoint>::iterator pathPointIter = mControlPoints.begin();
ControlPoint *P0 = &*(pathPointIter++);
ControlPoint *P1 = &*(pathPointIter++);
ControlPoint *P2 = &*(pathPointIter++);
ControlPoint *P3 = &*(pathPointIter++);
while (P2->time < t && P3->time > 0) {
P0 = P1;
P1 = P2;
P2 = P3;
P3 = &*(pathPointIter++);
}
float t_1 = (t - P1->time) / (P2->time - P1->time);
float t_2 = t_1 * t_1;
float t_3 = t_2 * t_1;
// compute per component //
for (unsigned int i = 0; i < 3; ++i) {
P.pos[i] = t_3 * (-1 * P0->pos[i] + 3 * P1->pos[i] - 3 * P2->pos[i] + P3->pos[i])
+ t_2 * ( 2 * P0->pos[i] - 5 * P1->pos[i] + 4 * P2->pos[i] - P3->pos[i])
+ t_1 * (-1 * P0->pos[i] + P2->pos[i])
+ 2 * P1->pos[i];
P.pos[i] /= 2;
}
return P;
}
AudioSource* AudioSource::clone(NodeCloneContext &context) const
{
GP_ASSERT(_buffer);
ALuint alSource = 0;
AL_CHECK( alGenSources(1, &alSource) );
if (AL_LAST_ERROR())
{
GP_ERROR("Error generating audio source.");
return NULL;
}
AudioSource* audioClone = new AudioSource(_buffer, alSource);
_buffer->addRef();
audioClone->setLooped(isLooped());
audioClone->setGain(getGain());
audioClone->setPitch(getPitch());
audioClone->setVelocity(getVelocity());
if (Node* node = getNode())
{
Node* clonedNode = context.findClonedNode(node);
if (clonedNode)
{
audioClone->setNode(clonedNode);
}
}
return audioClone;
}
