EntityItem::SimulationState EntityItem::computeSimulationState() const {
if (hasVelocity() || (hasGravity() && !isRestingOnSurface()) || hasAngularVelocity()) {
return EntityItem::Moving;
}
if (isMortal()) {
return EntityItem::Mortal;
}
return EntityItem::Static;
}
void EntityItem::update(const quint64& updateTime) {
bool wantDebug = false;
if (_lastUpdated == 0) {
_lastUpdated = updateTime;
}
float timeElapsed = (float)(updateTime - _lastUpdated) / (float)(USECS_PER_SECOND);
if (wantDebug) {
qDebug() << "********** EntityItem::update()";
qDebug() << " entity ID=" << getEntityItemID();
qDebug() << " updateTime=" << updateTime;
qDebug() << " _lastUpdated=" << _lastUpdated;
qDebug() << " timeElapsed=" << timeElapsed;
qDebug() << " hasVelocity=" << hasVelocity();
qDebug() << " hasGravity=" << hasGravity();
qDebug() << " isRestingOnSurface=" << isRestingOnSurface();
qDebug() << " hasAngularVelocity=" << hasAngularVelocity();
qDebug() << " getAngularVelocity=" << getAngularVelocity();
qDebug() << " isMortal=" << isMortal();
qDebug() << " getAge()=" << getAge();
qDebug() << " getLifetime()=" << getLifetime();
if (hasVelocity() || (hasGravity() && !isRestingOnSurface())) {
qDebug() << " MOVING...=";
qDebug() << " hasVelocity=" << hasVelocity();
qDebug() << " hasGravity=" << hasGravity();
qDebug() << " isRestingOnSurface=" << isRestingOnSurface();
qDebug() << " hasAngularVelocity=" << hasAngularVelocity();
qDebug() << " getAngularVelocity=" << getAngularVelocity();
}
if (hasAngularVelocity()) {
qDebug() << " CHANGING...=";
qDebug() << " hasAngularVelocity=" << hasAngularVelocity();
qDebug() << " getAngularVelocity=" << getAngularVelocity();
}
if (isMortal()) {
qDebug() << " MORTAL...=";
qDebug() << " isMortal=" << isMortal();
qDebug() << " getAge()=" << getAge();
qDebug() << " getLifetime()=" << getLifetime();
}
}
_lastUpdated = updateTime;
if (wantDebug) {
qDebug() << " ********** EntityItem::update() .... SETTING _lastUpdated=" << _lastUpdated;
}
if (hasAngularVelocity()) {
glm::quat rotation = getRotation();
glm::vec3 angularVelocity = glm::radians(getAngularVelocity());
float angularSpeed = glm::length(angularVelocity);
if (angularSpeed < EPSILON_VELOCITY_LENGTH) {
setAngularVelocity(NO_ANGULAR_VELOCITY);
} else {
float angle = timeElapsed * angularSpeed;
glm::quat dQ = glm::angleAxis(angle, glm::normalize(angularVelocity));
rotation = dQ * rotation;
setRotation(rotation);
// handle damping for angular velocity
if (getAngularDamping() > 0.0f) {
glm::vec3 dampingResistance = getAngularVelocity() * getAngularDamping();
glm::vec3 newAngularVelocity = getAngularVelocity() - (dampingResistance * timeElapsed);
setAngularVelocity(newAngularVelocity);
if (wantDebug) {
qDebug() << " getDamping():" << getDamping();
qDebug() << " dampingResistance:" << dampingResistance;
qDebug() << " newAngularVelocity:" << newAngularVelocity;
}
}
}
}
if (hasVelocity() || hasGravity()) {
glm::vec3 position = getPosition();
glm::vec3 velocity = getVelocity();
glm::vec3 newPosition = position + (velocity * timeElapsed);
if (wantDebug) {
qDebug() << " EntityItem::update()....";
qDebug() << " timeElapsed:" << timeElapsed;
qDebug() << " old AACube:" << getMaximumAACube();
qDebug() << " old position:" << position;
qDebug() << " old velocity:" << velocity;
qDebug() << " old getAABox:" << getAABox();
qDebug() << " getDistanceToBottomOfEntity():" << getDistanceToBottomOfEntity() * (float)TREE_SCALE << " in meters";
qDebug() << " newPosition:" << newPosition;
qDebug() << " glm::distance(newPosition, position):" << glm::distance(newPosition, position);
}
position = newPosition;
// handle bounces off the ground... We bounce at the distance to the bottom of our entity
if (position.y <= getDistanceToBottomOfEntity()) {
velocity = velocity * glm::vec3(1,-1,1);
// if we've slowed considerably, then just stop moving
if (glm::length(velocity) <= EPSILON_VELOCITY_LENGTH) {
velocity = NO_VELOCITY;
}
position.y = getDistanceToBottomOfEntity();
}
// handle gravity....
if (hasGravity() && !isRestingOnSurface()) {
velocity += getGravity() * timeElapsed;
}
// handle resting on surface case, this is definitely a bit of a hack, and it only works on the
// "ground" plane of the domain, but for now it
if (hasGravity() && isRestingOnSurface()) {
velocity.y = 0.0f;
position.y = getDistanceToBottomOfEntity();
}
// handle damping for velocity
glm::vec3 dampingResistance = velocity * getDamping();
if (wantDebug) {
qDebug() << " getDamping():" << getDamping();
qDebug() << " dampingResistance:" << dampingResistance;
qDebug() << " dampingResistance * timeElapsed:" << dampingResistance * timeElapsed;
}
velocity -= dampingResistance * timeElapsed;
if (wantDebug) {
qDebug() << " velocity AFTER dampingResistance:" << velocity;
qDebug() << " glm::length(velocity):" << glm::length(velocity);
qDebug() << " EPSILON_VELOCITY_LENGTH:" << EPSILON_VELOCITY_LENGTH;
}
// round velocity to zero if it's close enough...
if (glm::length(velocity) <= EPSILON_VELOCITY_LENGTH) {
velocity = NO_VELOCITY;
}
setPosition(position); // this will automatically recalculate our collision shape
setVelocity(velocity);
if (wantDebug) {
qDebug() << " new position:" << position;
qDebug() << " new velocity:" << velocity;
qDebug() << " new AACube:" << getMaximumAACube();
qDebug() << " old getAABox:" << getAABox();
}
}
}
