void MetavoxelNode::readDelta(const AttributePointer& attribute, const MetavoxelNode& reference, Bitstream& in) {
clearChildren(attribute);
bool leaf;
in >> leaf;
attribute->readDelta(in, _attributeValue, reference._attributeValue, leaf);
if (!leaf) {
if (reference.isLeaf()) {
for (int i = 0; i < CHILD_COUNT; i++) {
_children[i] = new MetavoxelNode(attribute);
_children[i]->read(attribute, in);
}
} else {
for (int i = 0; i < CHILD_COUNT; i++) {
bool changed;
in >> changed;
if (changed) {
_children[i] = new MetavoxelNode(attribute);
_children[i]->readDelta(attribute, *reference._children[i], in);
} else {
_children[i] = reference._children[i];
_children[i]->incrementReferenceCount();
}
}
}
}
}
void MetavoxelNode::writeDelta(const AttributePointer& attribute, const MetavoxelNode& reference, Bitstream& out) const {
bool leaf = isLeaf();
out << leaf;
attribute->writeDelta(out, _attributeValue, reference._attributeValue, leaf);
if (!leaf) {
if (reference.isLeaf()) {
for (int i = 0; i < CHILD_COUNT; i++) {
_children[i]->write(attribute, out);
}
} else {
for (int i = 0; i < CHILD_COUNT; i++) {
if (_children[i] == reference._children[i]) {
out << false;
} else {
out << true;
_children[i]->writeDelta(attribute, *reference._children[i], out);
}
}
}
}
}
void MetavoxelData::guide(MetavoxelVisitor& visitor) {
// start with the root values/defaults (plus the guide attribute)
const QVector<AttributePointer>& inputs = visitor.getInputs();
const QVector<AttributePointer>& outputs = visitor.getOutputs();
MetavoxelVisitation firstVisitation = { NULL, visitor, QVector<MetavoxelNode*>(inputs.size() + 1),
QVector<MetavoxelNode*>(outputs.size()), { glm::vec3(_size, _size, _size) * -0.5f, _size,
QVector<AttributeValue>(inputs.size() + 1), QVector<AttributeValue>(outputs.size()) } };
for (int i = 0; i < inputs.size(); i++) {
MetavoxelNode* node = _roots.value(inputs.at(i));
firstVisitation.inputNodes[i] = node;
firstVisitation.info.inputValues[i] = node ? node->getAttributeValue(inputs[i]) : inputs[i];
}
AttributePointer guideAttribute = AttributeRegistry::getInstance()->getGuideAttribute();
MetavoxelNode* node = _roots.value(guideAttribute);
firstVisitation.inputNodes.last() = node;
firstVisitation.info.inputValues.last() = node ? node->getAttributeValue(guideAttribute) : guideAttribute;
for (int i = 0; i < outputs.size(); i++) {
MetavoxelNode* node = _roots.value(outputs.at(i));
firstVisitation.outputNodes[i] = node;
}
static_cast<MetavoxelGuide*>(firstVisitation.info.inputValues.last().getInlineValue<
PolymorphicDataPointer>().data())->guide(firstVisitation);
for (int i = 0; i < outputs.size(); i++) {
AttributeValue& value = firstVisitation.info.outputValues[i];
if (!value.getAttribute()) {
continue;
}
// replace the old node with the new
MetavoxelNode*& node = _roots[value.getAttribute()];
if (node) {
node->decrementReferenceCount(value.getAttribute());
}
node = firstVisitation.outputNodes.at(i);
if (node->isLeaf() && value.isDefault()) {
// immediately remove the new node if redundant
node->decrementReferenceCount(value.getAttribute());
_roots.remove(value.getAttribute());
}
}
}