diff -r 02264bf0108d -r bb728c124d47 src/glcompiler.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/glcompiler.h	Tue Feb 14 14:53:06 2017 +0200
@@ -0,0 +1,72 @@
+/*
+ *  LDForge: LDraw parts authoring CAD
+ *  Copyright (C) 2013 - 2017 Teemu Piippo
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include "main.h"
+#include "glrenderer.h"
+#include "glShared.h"
+#include <QMap>
+#include <QSet>
+
+// =============================================================================
+//
+class GLCompiler : public QObject, public HierarchyElement, protected QOpenGLFunctions
+{
+	Q_OBJECT
+
+public:
+	struct ObjectVBOInfo
+	{
+		QVector<GLfloat>	data[NumVbos];
+		bool				isChanged;
+	};
+
+	GLCompiler (GLRenderer* renderer);
+	~GLCompiler();
+	QColor getColorForPolygon (LDPolygon& poly, LDObject* topobj, VboSubclass complement) const;
+	QColor indexColorForID (int id) const;
+	void initialize();
+	void needMerge();
+	void prepareVBO (int vbonum, const Model* model);
+	void setRenderer (GLRenderer* compiler);
+	void stageForCompilation (LDObject* obj);
+	void unstage (LDObject* obj);
+	GLuint vbo (int vbonum) const;
+	int vboSize (int vbonum) const;
+
+	static int vboNumber (VboClass surface, VboSubclass complement);
+
+private:
+	void compileStaged();
+	void compilePolygon (LDPolygon& poly, LDObject* topobj, ObjectVBOInfo* objinfo);
+	Q_SLOT void compileObject (LDObject* obj);
+	Q_SLOT void recompile();
+	void dropObjectInfo (LDObject* obj);
+	Q_SLOT void forgetObject(LDObject* object);
+
+private:
+	QMap<LDObject*, ObjectVBOInfo>	m_objectInfo;
+	QSet<LDObject*> m_staged; // Objects that need to be compiled
+	GLuint m_vbo[NumVbos];
+	bool m_vboChanged[NumVbos] = {true};
+	int m_vboSizes[NumVbos] = {0};
+	GLRenderer* m_renderer;
+};
+
+#define CHECK_GL_ERROR() { CheckGLErrorImpl (__FILE__, __LINE__); }
+void CheckGLErrorImpl (const char* file, int line);