From 6be18109679874eeb5b0f2a765cca786203c54ba Mon Sep 17 00:00:00 2001
From: Andrzej Kapolka <drzej.k@gmail.com>
Date: Wed, 26 Nov 2014 17:57:03 -0800
Subject: [PATCH] More work on subdivision.

---
 libraries/metavoxels/src/SharedObject.cpp |  8 ++++++
 libraries/metavoxels/src/SharedObject.h   |  6 +++++
 libraries/metavoxels/src/Spanner.cpp      | 31 +++++++++++++++++++++++
 libraries/metavoxels/src/Spanner.h        |  2 ++
 4 files changed, 47 insertions(+)

diff --git a/libraries/metavoxels/src/SharedObject.cpp b/libraries/metavoxels/src/SharedObject.cpp
index e57b7d9a8e..8f57c8be34 100644
--- a/libraries/metavoxels/src/SharedObject.cpp
+++ b/libraries/metavoxels/src/SharedObject.cpp
@@ -147,6 +147,14 @@ void SharedObject::readExtraDelta(Bitstream& in, const SharedObject* reference)
     // nothing by default
 }
 
+void SharedObject::writeExtraSubdivision(Bitstream& out) {
+    // nothing by default
+}
+
+void SharedObject::readExtraSubdivision(Bitstream& in) {
+    // nothing by default
+}
+
 QAtomicInt SharedObject::_nextID(1);
 WeakSharedObjectHash SharedObject::_weakHash;
 QReadWriteLock SharedObject::_weakHashLock;
diff --git a/libraries/metavoxels/src/SharedObject.h b/libraries/metavoxels/src/SharedObject.h
index 7f44ffec82..f35fde802c 100644
--- a/libraries/metavoxels/src/SharedObject.h
+++ b/libraries/metavoxels/src/SharedObject.h
@@ -92,6 +92,12 @@ public:
     /// Reads the delta-encoded non-property contents of this object from the specified stream.
     virtual void readExtraDelta(Bitstream& in, const SharedObject* reference);
 
+    /// Writes the subdivision of the non-property contents of this object to the specified stream.
+    virtual void writeExtraSubdivision(Bitstream& out);
+    
+    /// Reads the subdivision of the non-property contents of this object from the specified stream.
+    virtual void readExtraSubdivision(Bitstream& in);
+
 private:
     
     int _id;
diff --git a/libraries/metavoxels/src/Spanner.cpp b/libraries/metavoxels/src/Spanner.cpp
index 608dbc77c2..bdccb18b7e 100644
--- a/libraries/metavoxels/src/Spanner.cpp
+++ b/libraries/metavoxels/src/Spanner.cpp
@@ -2731,6 +2731,37 @@ void Heightfield::readExtraDelta(Bitstream& in, const SharedObject* reference) {
     }
 }
 
+void Heightfield::writeExtraSubdivision(Bitstream& out) {
+    MetavoxelLOD lod, referenceLOD;
+    if (out.getContext()) {
+        MetavoxelStreamBase* base = static_cast<MetavoxelStreamBase*>(out.getContext());
+        lod = transformLOD(base->lod);
+        referenceLOD = transformLOD(base->referenceLOD);
+    }
+    HeightfieldStreamBase base = { out, lod, referenceLOD };
+    HeightfieldStreamState state = { base, glm::vec2(), 1.0f };
+    
+    if (state.becameSubdivided()) {
+        out << SharedObjectPointer(this);
+        _root->writeSubdivision(state);
+    }
+}
+
+void Heightfield::readExtraSubdivision(Bitstream& in) {
+    MetavoxelLOD lod, referenceLOD;
+    if (in.getContext()) {
+        MetavoxelStreamBase* base = static_cast<MetavoxelStreamBase*>(in.getContext());
+        lod = transformLOD(base->lod);
+        referenceLOD = transformLOD(base->referenceLOD);
+    }
+    HeightfieldStreamBase base = { in, lod, referenceLOD };
+    HeightfieldStreamState state = { base, glm::vec2(), 1.0f };
+    
+    if (state.becameSubdividedOrCollapsed()) {
+        setRoot(HeightfieldNodePointer(_root->readSubdivision(state)));
+    }
+}
+
 QByteArray Heightfield::getRendererClassName() const {
     return "HeightfieldRenderer";
 }
diff --git a/libraries/metavoxels/src/Spanner.h b/libraries/metavoxels/src/Spanner.h
index 0b24c7e318..c832d3fbd5 100644
--- a/libraries/metavoxels/src/Spanner.h
+++ b/libraries/metavoxels/src/Spanner.h
@@ -592,6 +592,8 @@ public:
     virtual void readExtra(Bitstream& in);
     virtual void writeExtraDelta(Bitstream& out, const SharedObject* reference) const;
     virtual void readExtraDelta(Bitstream& in, const SharedObject* reference);
+    virtual void writeExtraSubdivision(Bitstream& out);
+    virtual void readExtraSubdivision(Bitstream& in);
     
 signals: