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());
}
}
}
void MetavoxelData::readDelta(const MetavoxelData& reference, Bitstream& in) {
// shallow copy the reference
*this = reference;
bool changed;
in >> changed;
if (!changed) {
return;
}
bool sizeChanged;
in >> sizeChanged;
if (sizeChanged) {
float size;
in >> size;
while (_size < size) {
expand();
}
}
int changedCount;
in >> changedCount;
for (int i = 0; i < changedCount; i++) {
AttributePointer attribute;
in.getAttributeStreamer() >> attribute;
MetavoxelNode*& root = _roots[attribute];
if (root) {
MetavoxelNode* oldRoot = root;
root = new MetavoxelNode(attribute);
root->readDelta(attribute, *oldRoot, in);
oldRoot->decrementReferenceCount(attribute);
} else {
root = new MetavoxelNode(attribute);
root->read(attribute, in);
}
}
int removedCount;
in >> removedCount;
for (int i = 0; i < removedCount; i++) {
AttributePointer attribute;
in.getAttributeStreamer() >> attribute;
_roots.take(attribute)->decrementReferenceCount(attribute);
}
}
void DefaultMetavoxelGuide::guide(MetavoxelVisitation& visitation) {
visitation.info.isLeaf = visitation.allInputNodesLeaves();
bool keepGoing = visitation.visitor.visit(visitation.info);
for (int i = 0; i < visitation.outputNodes.size(); i++) {
AttributeValue& value = visitation.info.outputValues[i];
if (!value.getAttribute()) {
continue;
}
MetavoxelNode*& node = visitation.outputNodes[i];
if (node && node->isLeaf() && value.getAttribute()->equal(value.getValue(), node->getAttributeValue())) {
// "set" to same value; disregard
value = AttributeValue();
} else {
node = new MetavoxelNode(value);
}
}
if (!keepGoing) {
return;
}
MetavoxelVisitation nextVisitation = { &visitation, visitation.visitor,
QVector<MetavoxelNode*>(visitation.inputNodes.size()), QVector<MetavoxelNode*>(visitation.outputNodes.size()),
{ glm::vec3(), visitation.info.size * 0.5f, QVector<AttributeValue>(visitation.inputNodes.size()),
QVector<AttributeValue>(visitation.outputNodes.size()) } };
for (int i = 0; i < MetavoxelNode::CHILD_COUNT; i++) {
for (int j = 0; j < visitation.inputNodes.size(); j++) {
MetavoxelNode* node = visitation.inputNodes.at(j);
MetavoxelNode* child = node ? node->getChild(i) : NULL;
nextVisitation.info.inputValues[j] = ((nextVisitation.inputNodes[j] = child)) ?
child->getAttributeValue(visitation.info.inputValues[j].getAttribute()) :
visitation.info.inputValues[j];
}
for (int j = 0; j < visitation.outputNodes.size(); j++) {
MetavoxelNode* node = visitation.outputNodes.at(j);
MetavoxelNode* child = node ? node->getChild(i) : NULL;
nextVisitation.outputNodes[j] = child;
}
nextVisitation.info.minimum = visitation.info.minimum + glm::vec3(
(i & X_MAXIMUM_FLAG) ? nextVisitation.info.size : 0.0f,
(i & Y_MAXIMUM_FLAG) ? nextVisitation.info.size : 0.0f,
(i & Z_MAXIMUM_FLAG) ? nextVisitation.info.size : 0.0f);
static_cast<MetavoxelGuide*>(nextVisitation.info.inputValues.last().getInlineValue<
PolymorphicDataPointer>().data())->guide(nextVisitation);
for (int j = 0; j < nextVisitation.outputNodes.size(); j++) {
AttributeValue& value = nextVisitation.info.outputValues[j];
if (!value.getAttribute()) {
continue;
}
// replace the child
AttributeValue& parentValue = visitation.info.outputValues[j];
if (!parentValue.getAttribute()) {
// shallow-copy the parent node on first change
parentValue = value;
MetavoxelNode*& node = visitation.outputNodes[j];
if (node) {
node = new MetavoxelNode(value.getAttribute(), node);
} else {
// create leaf with inherited value
node = new MetavoxelNode(visitation.getInheritedOutputValue(j));
}
}
MetavoxelNode* node = visitation.outputNodes.at(j);
MetavoxelNode* child = node->getChild(i);
if (child) {
child->decrementReferenceCount(value.getAttribute());
} else {
// it's a leaf; we need to split it up
AttributeValue nodeValue = node->getAttributeValue(value.getAttribute());
for (int k = 1; k < MetavoxelNode::CHILD_COUNT; k++) {
node->setChild((i + k) % MetavoxelNode::CHILD_COUNT, new MetavoxelNode(nodeValue));
}
}
node->setChild(i, nextVisitation.outputNodes.at(j));
value = AttributeValue();
}
}
for (int i = 0; i < visitation.outputNodes.size(); i++) {
AttributeValue& value = visitation.info.outputValues[i];
if (value.getAttribute()) {
MetavoxelNode* node = visitation.outputNodes.at(i);
node->mergeChildren(value.getAttribute());
value = node->getAttributeValue(value.getAttribute());
}
}
}