From 72a6254fa130bdff247b78e14af93817c67162fd Mon Sep 17 00:00:00 2001
From: Andrzej Kapolka <drzej.k@gmail.com>
Date: Fri, 12 Sep 2014 15:24:38 -0700
Subject: [PATCH] Only allow one "blender" to run at a time for each model.

---
 interface/src/renderer/Model.cpp | 27 +++++++++++++++++++++++----
 interface/src/renderer/Model.h   |  3 +++
 2 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/interface/src/renderer/Model.cpp b/interface/src/renderer/Model.cpp
index 280f5bd21a..0b16688056 100644
--- a/interface/src/renderer/Model.cpp
+++ b/interface/src/renderer/Model.cpp
@@ -61,7 +61,10 @@ Model::Model(QObject* parent) :
     _showTrueJointTransforms(true),
     _lodDistance(0.0f),
     _pupilDilation(0.0f),
-    _url("http://invalid.com") {
+    _url("http://invalid.com"),
+    _blenderPending(false),
+    _blendRequired(false) {
+    
     // we may have been created in the network thread, but we live in the main thread
     moveToThread(Application::getInstance()->thread());
 }
@@ -998,9 +1001,15 @@ void Model::simulateInternal(float deltaTime) {
         }
     }
     
-    // post the blender
+    // post the blender if we're not currently waiting for one to finish
     if (geometry.hasBlendedMeshes()) {
-        QThreadPool::globalInstance()->start(new Blender(this, _geometry, geometry.meshes, _blendshapeCoefficients));
+        if (_blenderPending) {
+            _blendRequired = true;
+        } else {
+            _blendRequired = false;
+            _blenderPending = true;
+            QThreadPool::globalInstance()->start(new Blender(this, _geometry, geometry.meshes, _blendshapeCoefficients));
+        }
     }
 }
 
@@ -1264,10 +1273,20 @@ void Model::renderJointCollisionShapes(float alpha) {
 }
 
 void Model::setBlendedVertices(const QVector<glm::vec3>& vertices, const QVector<glm::vec3>& normals) {
+    _blenderPending = false;
+    
+    // start the next blender if required
+    const FBXGeometry& geometry = _geometry->getFBXGeometry();
+    if (_blendRequired) {
+        _blendRequired = false;
+        if (geometry.hasBlendedMeshes()) {
+            _blenderPending = true;
+            QThreadPool::globalInstance()->start(new Blender(this, _geometry, geometry.meshes, _blendshapeCoefficients));
+        }
+    }
     if (_blendedVertexBuffers.isEmpty()) {
         return;
     }
-    const FBXGeometry& geometry = _geometry->getFBXGeometry();
     int index = 0;
     for (int i = 0; i < geometry.meshes.size(); i++) {
         const FBXMesh& mesh = geometry.meshes.at(i);
diff --git a/interface/src/renderer/Model.h b/interface/src/renderer/Model.h
index 6c27970d8e..396a3e576c 100644
--- a/interface/src/renderer/Model.h
+++ b/interface/src/renderer/Model.h
@@ -284,6 +284,9 @@ private:
     glm::vec4 _localLightColors[MAX_LOCAL_LIGHTS];
     glm::vec4 _localLightDirections[MAX_LOCAL_LIGHTS];
 
+    bool _blenderPending;
+    bool _blendRequired;
+
     static ProgramObject _program;
     static ProgramObject _normalMapProgram;
     static ProgramObject _specularMapProgram;