The GtkRadiant sources as originally released under the GPL license.

include/icamera.h

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+/*
+Copyright (C) 1999-2006 Id Software, Inc. and contributors.
+For a list of contributors, see the accompanying CONTRIBUTORS file.
+
+This file is part of GtkRadiant.
+
+GtkRadiant 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 2 of the License, or
+(at your option) any later version.
+
+GtkRadiant 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 GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+//-----------------------------------------------------------------------------
+//
+// DESCRIPTION:
+// camera interface
+//
+
+#if !defined(INCLUDED_ICAMERA_H)
+#define INCLUDED_ICAMERA_H
+
+#include "generic/constant.h"
+
+class Matrix4;
+
+class CameraView
+{
+public:
+  virtual void setModelview(const Matrix4& modelview) = 0;
+  virtual void setFieldOfView(float fieldOfView) = 0;
+};
+
+class Callback;
+
+class CameraModel
+{
+public:
+  STRING_CONSTANT(Name, "CameraModel");
+  virtual void setCameraView(CameraView* view, const Callback& disconnect) = 0;
+};
+
+template<typename Element> class BasicVector3;
+typedef BasicVector3<float> Vector3;
+
+typedef void		(* PFN_GETCAMERA)		( Vector3& origin, Vector3& angles );
+typedef void		(* PFN_SETCAMERA)		( const Vector3& origin, const Vector3& angles );
+typedef void		(* PFN_GETCAMWINDOWEXTENTS)	( int *x, int *y, int *width, int *height );
+
+struct _QERCameraTable
+{
+  INTEGER_CONSTANT(Version, 1);
+  STRING_CONSTANT(Name, "camera");
+
+	PFN_GETCAMERA		m_pfnGetCamera;
+	PFN_SETCAMERA		m_pfnSetCamera;
+	PFN_GETCAMWINDOWEXTENTS	m_pfnGetCamWindowExtents;
+};
+
+#endif