Added SoftAttachmentModel class.

Is a subclass of Model, it overrides the updateClusterMatrices so it will pull
the actual joint matrices from a different rig override.

For the avatar soft attachment system, this override will be the Avatar::_skeletonModel rig.
This will give us the ability for an avatar to "wear" non-rigid attachments, such as clothing.

interface/src/avatar/SoftAttachmentModel.cpp

@@ -0,0 +1,83 @@
+//
+//  SoftAttachmentModel.cpp
+//  interface/src/avatar
+//
+//  Created by Anthony J. Thibault on 12/17/15.
+//  Copyright 2013 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#include "SoftAttachmentModel.h"
+
+SoftAttachmentModel::SoftAttachmentModel(RigPointer rig, QObject* parent, RigPointer rigOverride) :
+    Model(rig, parent),
+    _rigOverride(rigOverride) {
+    assert(_rig);
+    assert(_rigOverride);
+}
+
+SoftAttachmentModel::~SoftAttachmentModel() {
+}
+
+// virtual
+void SoftAttachmentModel::updateRig(float deltaTime, glm::mat4 parentTransform) {
+    _needsUpdateClusterMatrices = true;
+}
+
+int SoftAttachmentModel::getJointIndexOverride(int i) const {
+    QString name = _rig->nameOfJoint(i);
+    if (name.isEmpty()) {
+        return -1;
+    }
+    return _rigOverride->indexOfJoint(name);
+}
+
+// virtual
+// use the _rigOverride matrices instead of the Model::_rig
+void SoftAttachmentModel::updateClusterMatrices(glm::vec3 modelPosition, glm::quat modelOrientation) {
+    if (!_needsUpdateClusterMatrices) {
+        return;
+    }
+    _needsUpdateClusterMatrices = false;
+
+    const FBXGeometry& geometry = _geometry->getFBXGeometry();
+
+    glm::mat4 modelToWorld = glm::mat4_cast(modelOrientation);
+    for (int i = 0; i < _meshStates.size(); i++) {
+        MeshState& state = _meshStates[i];
+        const FBXMesh& mesh = geometry.meshes.at(i);
+
+        for (int j = 0; j < mesh.clusters.size(); j++) {
+            const FBXCluster& cluster = mesh.clusters.at(j);
+
+            // TODO: cache these look ups as an optimization
+            int jointIndexOverride = getJointIndexOverride(cluster.jointIndex);
+            glm::mat4 jointMatrix(glm::mat4::_null);
+            if (jointIndexOverride >= 0 && jointIndexOverride < getJointStateCount()) {
+                jointMatrix = _rigOverride->getJointTransform(jointIndexOverride);
+            } else {
+                jointMatrix = _rig->getJointTransform(cluster.jointIndex);
+            }
+            state.clusterMatrices[j] = modelToWorld * jointMatrix * cluster.inverseBindMatrix;
+        }
+
+        // Once computed the cluster matrices, update the buffer(s)
+        if (mesh.clusters.size() > 1) {
+            if (!state.clusterBuffer) {
+                state.clusterBuffer = std::make_shared<gpu::Buffer>(state.clusterMatrices.size() * sizeof(glm::mat4),
+                                                                    (const gpu::Byte*) state.clusterMatrices.constData());
+            } else {
+                state.clusterBuffer->setSubData(0, state.clusterMatrices.size() * sizeof(glm::mat4),
+                                                (const gpu::Byte*) state.clusterMatrices.constData());
+            }
+        }
+    }
+
+    // post the blender if we're not currently waiting for one to finish
+    if (geometry.hasBlendedMeshes() && _blendshapeCoefficients != _blendedBlendshapeCoefficients) {
+        _blendedBlendshapeCoefficients = _blendshapeCoefficients;
+        DependencyManager::get<ModelBlender>()->noteRequiresBlend(this);
+    }
+}

interface/src/avatar/SoftAttachmentModel.h

@@ -0,0 +1,34 @@
+//
+//  SoftAttachmentModel.h
+//  interface/src/avatar
+//
+//  Created by Anthony J. Thibault on 12/17/15.
+//  Copyright 2015 High Fidelity, Inc.
+//
+//  Distributed under the Apache License, Version 2.0.
+//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
+//
+
+#ifndef hifi_SoftAttachmentModel_h
+#define hifi_SoftAttachmentModel_h
+
+#include <Model.h>
+
+class SoftAttachmentModel : public Model {
+    Q_OBJECT
+
+public:
+
+    SoftAttachmentModel(RigPointer rig, QObject* parent, RigPointer rigOverride);
+    ~SoftAttachmentModel();
+
+    virtual void updateRig(float deltaTime, glm::mat4 parentTransform) override;
+    virtual void updateClusterMatrices(glm::vec3 modelPosition, glm::quat modelOrientation) override;
+
+protected:
+    int getJointIndexOverride(int i) const;
+
+    RigPointer _rigOverride;
+};
+
+#endif // hifi_SoftAttachmentModel_h

libraries/animation/src/Rig.cpp

@@ -245,6 +245,14 @@ int Rig::indexOfJoint(const QString& jointName) const {
     }
 }
 
+QString Rig::nameOfJoint(int jointIndex) const {
+    if (_animSkeleton) {
+        return _animSkeleton->getJointName(jointIndex);
+    } else {
+        return "";
+    }
+}
+
 void Rig::setModelOffset(const glm::mat4& modelOffsetMat) {
     AnimPose newModelOffset = AnimPose(modelOffsetMat);
     if (!isEqual(_modelOffset.trans, newModelOffset.trans) ||

libraries/animation/src/Rig.h

@@ -91,6 +91,7 @@ public:
     bool jointStatesEmpty();
     int getJointStateCount() const;
     int indexOfJoint(const QString& jointName) const;
+    QString nameOfJoint(int jointIndex) const;
 
     void setModelOffset(const glm::mat4& modelOffsetMat);
 

libraries/render-utils/src/Model.cpp

@@ -971,11 +971,14 @@ void Model::updateRig(float deltaTime, glm::mat4 parentTransform) {
     _needsUpdateClusterMatrices = true;
     _rig->updateAnimations(deltaTime, parentTransform);
 }
+
 void Model::simulateInternal(float deltaTime) {
     // update the world space transforms for all joints
     glm::mat4 parentTransform = glm::scale(_scale) * glm::translate(_offset);
     updateRig(deltaTime, parentTransform);
 }
+
+// virtual
 void Model::updateClusterMatrices(glm::vec3 modelPosition, glm::quat modelOrientation) {
     PerformanceTimer perfTimer("Model::updateClusterMatrices");
 

libraries/render-utils/src/Model.h

@@ -112,7 +112,7 @@ public:
     bool getSnapModelToRegistrationPoint() { return _snapModelToRegistrationPoint; }
 
     virtual void simulate(float deltaTime, bool fullUpdate = true);
-    void updateClusterMatrices(glm::vec3 modelPosition, glm::quat modelOrientation);
+    virtual void updateClusterMatrices(glm::vec3 modelPosition, glm::quat modelOrientation);
 
     /// Returns a reference to the shared geometry.
     const QSharedPointer<NetworkGeometry>& getGeometry() const { return _geometry; }
@@ -312,7 +312,7 @@ protected:
     // hook for derived classes to be notified when setUrl invalidates the current model.
     virtual void onInvalidate() {};
 
-private:
+protected:
 
     void deleteGeometry();
     void initJointTransforms();
@@ -370,7 +370,6 @@ private:
     bool _showCollisionHull = false;
 
     friend class ModelMeshPartPayload;
-protected:
     RigPointer _rig;
 };