More set/blend bits.

libraries/metavoxels/src/AttributeRegistry.cpp

@@ -144,6 +144,14 @@ void OwnedAttributeValue::mix(const AttributeValue& first, const AttributeValue&
     _value = _attribute->mix(first.getValue(), second.getValue(), alpha);
 }
 
+void OwnedAttributeValue::blend(const AttributeValue& source, const AttributeValue& dest) {
+    if (_attribute) {
+        _attribute->destroy(_value);
+    }
+    _attribute = source.getAttribute();
+    _value = _attribute->blend(source.getValue(), dest.getValue());
+}
+
 OwnedAttributeValue& OwnedAttributeValue::operator=(const AttributeValue& other) {
     if (_attribute) {
         _attribute->destroy(_value);
@@ -243,6 +251,19 @@ void* QRgbAttribute::mix(void* first, void* second, float alpha) const {
         glm::mix((float)qAlpha(firstValue), (float)qAlpha(secondValue), alpha)));
 }
 
+const float EIGHT_BIT_MAXIMUM = 255.0f;
+
+void* QRgbAttribute::blend(void* source, void* dest) const {
+    QRgb sourceValue = decodeInline<QRgb>(source);
+    QRgb destValue = decodeInline<QRgb>(dest);    
+    float alpha = qAlpha(sourceValue) / EIGHT_BIT_MAXIMUM;
+    return encodeInline(qRgba(
+        glm::mix((float)qRed(destValue), (float)qRed(sourceValue), alpha),
+        glm::mix((float)qGreen(destValue), (float)qGreen(sourceValue), alpha),
+        glm::mix((float)qBlue(destValue), (float)qBlue(sourceValue), alpha),
+        glm::mix((float)qAlpha(destValue), (float)qAlpha(sourceValue), alpha)));
+}
+
 void* QRgbAttribute::createFromScript(const QScriptValue& value, QScriptEngine* engine) const {
     return encodeInline((QRgb)value.toUInt32());
 }
@@ -287,6 +308,13 @@ void* PackedNormalAttribute::mix(void* first, void* second, float alpha) const {
     return encodeInline(packNormal(glm::normalize(glm::mix(firstNormal, secondNormal, alpha))));
 }
 
+void* PackedNormalAttribute::blend(void* source, void* dest) const {
+    QRgb sourceValue = decodeInline<QRgb>(source);
+    QRgb destValue = decodeInline<QRgb>(dest);    
+    float alpha = qAlpha(sourceValue) / EIGHT_BIT_MAXIMUM;
+    return encodeInline(packNormal(glm::normalize(glm::mix(unpackNormal(destValue), unpackNormal(sourceValue), alpha))));
+}
+
 const float CHAR_SCALE = 127.0f;
 const float INVERSE_CHAR_SCALE = 1.0f / CHAR_SCALE;
 

libraries/metavoxels/src/AttributeRegistry.h

@@ -158,6 +158,9 @@ public:
     /// Sets this attribute to a mix of the first and second provided.    
     void mix(const AttributeValue& first, const AttributeValue& second, float alpha);
 
+    /// Sets this attribute to a blend of the source and destination.
+    void blend(const AttributeValue& source, const AttributeValue& dest);
+    
     /// Destroys the current value, if any, and copies the specified other value.
     OwnedAttributeValue& operator=(const AttributeValue& other);
     
@@ -218,6 +221,9 @@ public:
     /// Mixes the first and the second, returning a new value with the result.
     virtual void* mix(void* first, void* second, float alpha) const = 0;
 
+    /// Blends the source with the destination, returning a new value with the result.
+    virtual void* blend(void* source, void* dest) const = 0;
+
     virtual void* getDefaultValue() const = 0;
 
     virtual void* createFromScript(const QScriptValue& value, QScriptEngine* engine) const { return create(); }
@@ -249,6 +255,8 @@ public:
 
     virtual void* mix(void* first, void* second, float alpha) const { return create(alpha < 0.5f ? first : second); }
 
+    virtual void* blend(void* source, void* dest) const { return create(source); }
+
     virtual void* getDefaultValue() const { return encodeInline(_defaultValue); }
 
 protected:
@@ -315,6 +323,8 @@ public:
     
     virtual void* mix(void* first, void* second, float alpha) const;
     
+    virtual void* blend(void* source, void* dest) const;
+    
     virtual void* createFromScript(const QScriptValue& value, QScriptEngine* engine) const;
     
     virtual void* createFromVariant(const QVariant& value) const;
@@ -333,6 +343,8 @@ public:
     virtual bool merge(void*& parent, void* children[], bool postRead = false) const;
     
     virtual void* mix(void* first, void* second, float alpha) const;
+    
+    virtual void* blend(void* source, void* dest) const;
 };
 
 /// Packs a normal into an RGB value.

libraries/metavoxels/src/MetavoxelData.cpp

@@ -336,17 +336,41 @@ static glm::vec3 getNextMinimum(const glm::vec3& minimum, float nextSize, int in
         (index & Z_MAXIMUM_FLAG) ? nextSize : 0.0f);
 }
 
-static void setNode(const AttributePointer& attribute, MetavoxelNode*& node, MetavoxelNode* other) {
-    if (node) {
-        node->decrementReferenceCount(attribute);
+static void setNode(const AttributeValue& value, MetavoxelNode*& node, MetavoxelNode* other, bool blend) {
+    if (!blend) {
+        // if we're not blending, we can just make a shallow copy
+        if (node) {
+            node->decrementReferenceCount(value.getAttribute());
+        }
+        (node = other)->incrementReferenceCount();
+        return;
     }
-    (node = other)->incrementReferenceCount();
+    if (node) {
+        MetavoxelNode* oldNode = node;
+        node = new MetavoxelNode(value.getAttribute(), oldNode);
+        oldNode->decrementReferenceCount(value.getAttribute());
+        
+    } else {
+        node = new MetavoxelNode(value);
+    }
+    OwnedAttributeValue oldValue = node->getAttributeValue(value.getAttribute());
+    node->blendAttributeValues(other->getAttributeValue(value.getAttribute()), oldValue);
+    if (other->isLeaf()) {
+        node->clearChildren(value.getAttribute());
+        return;
+    }
+    for (int i = 0; i < MetavoxelNode::CHILD_COUNT; i++) {
+        MetavoxelNode* child = node->getChild(i);
+        setNode(oldValue, child, other->getChild(i), true);
+        node->setChild(i, child);
+    }
+    node->mergeChildren(value.getAttribute());
 }
 
 static void setNode(const AttributeValue& value, MetavoxelNode*& node, const glm::vec3& minimum, float size,
-        MetavoxelNode* other, const glm::vec3& otherMinimum, float otherSize) {
+        MetavoxelNode* other, const glm::vec3& otherMinimum, float otherSize, bool blend) {
     if (otherSize >= size) {
-        setNode(value.getAttribute(), node, other);
+        setNode(value, node, other, blend);
         return;
     }
     if (!node) {
@@ -372,21 +396,27 @@ static void setNode(const AttributeValue& value, MetavoxelNode*& node, const glm
     }
     MetavoxelNode* nextNode = node->getChild(index);
     setNode(node->getAttributeValue(value.getAttribute()), nextNode, getNextMinimum(minimum, nextSize, index),
-        nextSize, other, otherMinimum, otherSize);
+        nextSize, other, otherMinimum, otherSize, blend);
     node->setChild(index, nextNode);
+    node->mergeChildren(value.getAttribute());
 }
 
-void MetavoxelData::set(const glm::vec3& minimum, const MetavoxelData& data) {
+void MetavoxelData::set(const glm::vec3& minimum, const MetavoxelData& data, bool blend) {
     // expand to fit the entire data
     Box bounds = minimum + glm::vec3(data.getSize(), data.getSize(), data.getSize());
     while (!getBounds().contains(bounds)) {
         expand();
     }
     
-    // set each attribute separately
+    // set/mix each attribute separately
     for (QHash<AttributePointer, MetavoxelNode*>::const_iterator it = data._roots.constBegin();
             it != data._roots.constEnd(); it++) {
-        setNode(it.key(), _roots[it.key()], getMinimum(), getSize(), it.value(), minimum, data.getSize());
+        MetavoxelNode*& root = _roots[it.key()];
+        setNode(it.key(), root, getMinimum(), getSize(), it.value(), minimum, data.getSize(), blend);
+        if (root->isLeaf() && root->getAttributeValue(it.key()).isDefault()) {
+            _roots.remove(it.key());
+            root->decrementReferenceCount(it.key());
+        }
     }
 }
 
@@ -659,7 +689,11 @@ MetavoxelNode::MetavoxelNode(const AttributePointer& attribute, const MetavoxelN
 void MetavoxelNode::setAttributeValue(const AttributeValue& attributeValue) {
     attributeValue.getAttribute()->destroy(_attributeValue);
     _attributeValue = attributeValue.copy();
-    clearChildren(attributeValue.getAttribute());
+}
+
+void MetavoxelNode::blendAttributeValues(const AttributeValue& source, const AttributeValue& dest) {
+    source.getAttribute()->destroy(_attributeValue);
+    _attributeValue = source.getAttribute()->blend(source.getValue(), dest.getValue());
 }
 
 AttributeValue MetavoxelNode::getAttributeValue(const AttributePointer& attribute) const {

libraries/metavoxels/src/MetavoxelData.h

@@ -91,7 +91,7 @@ public:
         const AttributePointer& attribute, float& distance, const MetavoxelLOD& lod = MetavoxelLOD());
 
     /// Sets part of the data.
-    void set(const glm::vec3& minimum, const MetavoxelData& data);
+    void set(const glm::vec3& minimum, const MetavoxelData& data, bool blend = false);
 
     /// Expands the tree, increasing its capacity in all dimensions.
     void expand();
@@ -158,6 +158,8 @@ public:
     
     void setAttributeValue(const AttributeValue& attributeValue);
 
+    void blendAttributeValues(const AttributeValue& source, const AttributeValue& dest);
+
     AttributeValue getAttributeValue(const AttributePointer& attribute) const;
     void* getAttributeValue() const { return _attributeValue; }
 
@@ -190,13 +192,13 @@ public:
 
     void destroy(const AttributePointer& attribute);
 
+    void clearChildren(const AttributePointer& attribute);
+    
 private:
     Q_DISABLE_COPY(MetavoxelNode)
     
     friend class MetavoxelVisitation;
     
-    void clearChildren(const AttributePointer& attribute);
-    
     int _referenceCount;
     void* _attributeValue;
     MetavoxelNode* _children[CHILD_COUNT];

libraries/metavoxels/src/MetavoxelMessages.cpp

@@ -306,11 +306,12 @@ void SetSpannerEdit::apply(MetavoxelData& data, const WeakSharedObjectHash& obje
     setIntersectingMasked(spanner->getBounds(), data);
 }
 
-SetDataEdit::SetDataEdit(const glm::vec3& minimum, const MetavoxelData& data) :
+SetDataEdit::SetDataEdit(const glm::vec3& minimum, const MetavoxelData& data, bool blend) :
     minimum(minimum),
-    data(data) {
+    data(data),
+    blend(blend) {
 }
 
 void SetDataEdit::apply(MetavoxelData& data, const WeakSharedObjectHash& objects) const {
-    data.set(minimum, this->data);
+    data.set(minimum, this->data, blend);
 }

libraries/metavoxels/src/MetavoxelMessages.h

@@ -183,10 +183,10 @@ class SetDataEdit : public MetavoxelEdit {
 public:
     
     STREAM glm::vec3 minimum;
-    
     STREAM MetavoxelData data;
+    STREAM bool blend;
     
-    SetDataEdit(const glm::vec3& minimum = glm::vec3(), const MetavoxelData& data = MetavoxelData());
+    SetDataEdit(const glm::vec3& minimum = glm::vec3(), const MetavoxelData& data = MetavoxelData(), bool blend = false);
     
     virtual void apply(MetavoxelData& data, const WeakSharedObjectHash& objects) const;
 };