The GtkRadiant sources as originally released under the GPL license.

tools/quake2/qdata_heretic2/common/trilib.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
+*/
+
+//
+// trilib.h: header file for loading triangles from an Alias triangle file
+//
+
+#include "fmodel.h"
+
+#define MAXTRIANGLES	MAX_FM_TRIANGLES
+
+typedef struct 
+{
+	vec3_t		verts[3];
+#if 1
+	int			indicies[3];
+	float		uv[3][2];
+	qboolean	HasUV;
+#endif
+} triangle_t;
+
+#define NUM_CLUSTERS 8
+
+typedef struct
+{
+	char	name[64];
+	byte	tris[MAXTRIANGLES>>3];
+	byte	verts[MAX_FM_VERTS>>3];
+	int		start_glcmds, num_glcmds;
+
+	int *clusters[NUM_CLUSTERS];
+	struct IntListNode_s *vertLists[NUM_CLUSTERS];
+	int num_verts[NUM_CLUSTERS + 1];
+	int new_num_verts[NUM_CLUSTERS + 1];
+	qboolean clustered;
+} mesh_node_t;
+
+void LoadTriangleList (char *filename, triangle_t **pptri, int *numtriangles, mesh_node_t **ppmnodes, int *num_mesh_nodes);