Added SyncBuffer class

- Added SyncBuffer class for easy and effecient synchronization
- Small changes to Camera class
- Forward declared a few classes to minimize dependencies

src/util/syncbuffer.cpp

@@ -0,0 +1,51 @@
+/*****************************************************************************************
+ *                                                                                       *
+ * OpenSpace                                                                             *
+ *                                                                                       *
+ * Copyright (c) 2014                                                                    *
+ *                                                                                       *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this  *
+ * software and associated documentation files (the "Software"), to deal in the Software *
+ * without restriction, including without limitation the rights to use, copy, modify,    *
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software, and to    *
+ * permit persons to whom the Software is furnished to do so, subject to the following   *
+ * conditions:                                                                           *
+ *                                                                                       *
+ * The above copyright notice and this permission notice shall be included in all copies *
+ * or substantial portions of the Software.                                              *
+ *                                                                                       *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,   *
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A         *
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT    *
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF  *
+ * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE  *
+ * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
+ ****************************************************************************************/
+
+#include <openspace/util/syncbuffer.h>
+
+namespace openspace {
+
+SyncBuffer::SyncBuffer(size_t n)
+	: _n(n)
+	, _encodeOffset(0)
+	, _decodeOffset(0)
+{
+	_dataStream.resize(_n);
+}
+
+void SyncBuffer::write() {
+	_synchronizationBuffer.setVal(_dataStream);
+	sgct::SharedData::instance()->writeVector(&_synchronizationBuffer);
+	_encodeOffset = 0;
+	_decodeOffset = 0;
+}
+
+void SyncBuffer::read() {
+	sgct::SharedData::instance()->readVector(&_synchronizationBuffer);
+	_dataStream = std::move(_synchronizationBuffer.getVal());
+	_encodeOffset = 0;
+	_decodeOffset = 0;
+}
+
+} // namespace openspace