The GtkRadiant sources as originally released under the GPL license.

tools/quake2/qdata_heretic2/qd_skeletons.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
+*/
+
+#ifndef QD_SKELETONS_H
+#define QD_SKELETONS_H
+
+#include "placement.h"
+
+
+typedef struct Placement_d_s
+{
+	vec3d_t origin;
+	vec3d_t direction;
+	vec3d_t up;
+} Placement_d_t;
+
+typedef struct QD_SkeletalJoint_s
+{
+	Placement_d_t placement;
+	vec3d_t		rotation;
+} QD_SkeletalJoint_t;
+
+#define NUM_CLUSTERS 8
+
+typedef struct IntListNode_s
+{
+	int data;
+	struct IntListNode_s *next;
+} IntListNode_t;  // gaak
+
+typedef struct Skeletalfmheader_s
+{
+	int type;
+	int clustered;
+	int references;
+
+	int *clusters[NUM_CLUSTERS];
+	IntListNode_t *vertLists[NUM_CLUSTERS];
+	int num_verts[NUM_CLUSTERS + 1];
+	int new_num_verts[NUM_CLUSTERS + 1];
+
+	float scaling[3];
+	float rotation[3];
+	float translation[3];
+} Skeletalfmheader_t;
+
+#define SKELETAL_NAME_MAX 32
+
+extern Skeletalfmheader_t g_skelModel;
+
+void ClearSkeletalModel();
+void GrabModelTransform(char *frame);
+void GrabSkeletalFrame(char *frame);
+void GrabReferencedFrame(char *frame);
+
+// Reference Stuff
+#define NUM_REFERENCES 8
+
+#define REF_MAX_POINTS	16
+#define REF_MAX_STRLEN	32
+
+// We're assuming no more than 16 reference points, with no more than 32 characters in the name
+extern char RefPointNameList[REF_MAX_POINTS][REF_MAX_STRLEN];
+extern int	RefPointNum;
+
+#endif