diff -r 918b6c0f8b5b -r ed9685f44ab3 src/gl/common.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gl/common.h	Sat Dec 14 22:36:06 2019 +0200
@@ -0,0 +1,158 @@
+/*
+ *  LDForge: LDraw parts authoring CAD
+ *  Copyright (C) 2013 - 2018 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 <QColor>
+#include <QOpenGLFunctions>
+#include <QGenericMatrix>
+#include "basics.h"
+#include "colors.h"
+#include "vertex.h"
+
+namespace gl
+{
+	// Transformation matrices for projection cameras.
+	static const QMatrix4x4 topCameraMatrix = {};
+	static const QMatrix4x4 frontCameraMatrix = {1, 0, 0, 0, 0, 0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1};
+	static const QMatrix4x4 leftCameraMatrix = {0, -1, 0, 0, 0, 0, 1, 0, -1, 0, 0, 0, 0, 0, 0, 1};
+	static const QMatrix4x4 bottomCameraMatrix = {1, 0, 0, 0, 0, -1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 1};
+	static const QMatrix4x4 backCameraMatrix = {-1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1};
+	static const QMatrix4x4 rightCameraMatrix = {0, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 1};
+
+	// Conversion matrix from LDraw to OpenGL coordinates.
+	static const QMatrix4x4 ldrawToGL = {1, 0, 0, 0, 0, 0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1};
+
+	static constexpr QRgb BlackRgb = 0xff000000;
+	static constexpr GLfloat near = 1.0f;
+	static constexpr GLfloat far = 10000.0f;
+	struct Polygon;
+}
+
+struct gl::Polygon
+{
+	enum Type : qint8
+	{
+		EdgeLine,
+		Triangle,
+		Quadrilateral,
+		ConditionalEdge
+	};
+	Type type;
+	Point3D vertices[4];
+	Color color;
+
+	/**
+	 * @return amount of vertices used for geometry
+	 */
+	inline int numPolygonVertices() const
+	{
+		if (type == Type::ConditionalEdge)
+			return 2;
+		else
+			return numVertices();
+	}
+
+	/**
+	 * @return amount of vertices
+	 */
+	inline int numVertices() const
+	{
+		switch (type)
+		{
+		case Type::EdgeLine:
+			return 2;
+		case Type::Triangle:
+			return 3;
+		case Type::ConditionalEdge:
+		case Type::Quadrilateral:
+			return 4;
+		default:
+			return 0;
+		}
+	}
+};
+
+Q_DECLARE_METATYPE(gl::Polygon)
+
+namespace gl
+{
+	inline Polygon edgeLine(const Point3D& v_1, const Point3D& v_2, Color color)
+	{
+		return {Polygon::EdgeLine, {v_1, v_2}, color};
+	}
+
+	inline Polygon triangle(const Point3D& v_1, const Point3D& v_2, const Point3D& v_3, Color color)
+	{
+		return {Polygon::Triangle, {v_1, v_2, v_3}, color};
+	}
+
+	inline Polygon quadrilateral(
+		const Point3D& v_1,
+		const Point3D& v_2,
+		const Point3D& v_3,
+		const Point3D& v_4,
+		Color color)
+	{
+		return {Polygon::Quadrilateral, {v_1, v_2, v_3, v_4}, color};
+	}
+
+	inline Polygon conditionalEdge(
+		const Point3D& v_1,
+		const Point3D& v_2,
+		const Point3D& control_1,
+		const Point3D& control_2,
+		Color color)
+	{
+		return {Polygon::ConditionalEdge, {v_1, v_2, control_1, control_2}, color};
+	}
+
+	// Vbo names
+	enum class VboClass
+	{
+		Lines,
+		Triangles,
+		Quads,
+		ConditionalLines
+	};
+	constexpr int numVboClasses = 4;
+
+	// Types of vbo per object
+	enum class VboSubclass
+	{
+		Surfaces,
+		RegularColors,
+		PickColors,
+		BfcFrontColors,
+		BfcBackColors,
+		RandomColors,
+		Normals,
+		InvertedNormals
+	};
+	constexpr int numVboSubclasses = 8;
+
+	// Amount of vbos overall
+	constexpr int numVbos = gl::numVboClasses * gl::numVboSubclasses;
+
+	enum class RenderStyle
+	{
+		Normal,
+		Wireframe,
+		BfcRedGreen,
+		RandomColors
+	};
+}