The GtkRadiant sources as originally released under the GPL license.

libs/texturelib.h

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+/*
+Copyright (C) 2001-2006, William Joseph.
+All Rights Reserved.
+
+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
+*/
+
+#if !defined (INCLUDED_TEXTURELIB_H)
+#define INCLUDED_TEXTURELIB_H
+
+#include "math/vector.h"
+typedef Vector3 Colour3;
+typedef unsigned int GLuint;
+class LoadImageCallback;
+
+// describes a GL texture
+struct qtexture_t
+{
+  qtexture_t(const LoadImageCallback& load, const char* name) : load(load), name(name)
+  {
+  }
+  const LoadImageCallback& load;
+  const char* name;
+  std::size_t width, height;
+  GLuint texture_number; // gl bind number
+  Colour3 color; // for flat shade mode
+  int surfaceFlags, contentFlags, value;
+};
+
+#endif