From http://www.jwz.org/xscreensaver/xscreensaver-5.39.tar.gz

[xscreensaver] / hacks / glx / quickhull.h

diff --git a/hacks/glx/quickhull.h b/hacks/glx/quickhull.h
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+/* quickhull, Copyright (c) 2016 Karim Naaji, karim.naaji@gmail.com
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE
+*/
+
+#ifndef __QUICKHULL_H__
+#define __QUICKHULL_H__
+
+typedef struct qh_vertex {
+  union {
+    double v[3];
+    struct {
+      double x;
+      double y;
+      double z;
+    };
+  };
+} qh_vertex_t;
+
+typedef qh_vertex_t qh_vec3_t;
+
+typedef struct qh_mesh {
+  qh_vertex_t* vertices;
+  qh_vec3_t* normals;
+  unsigned int* indices;
+  unsigned int* normalindices;
+  unsigned int nindices;
+  unsigned int nvertices;
+  unsigned int nnormals;
+} qh_mesh_t;
+
+extern qh_mesh_t qh_quickhull3d(qh_vertex_t const* vertices,
+                                unsigned int nvertices);
+
+extern void qh_free_mesh(qh_mesh_t mesh);
+
+#ifdef QUICKHULL_FILES
+extern void qh_mesh_export(qh_mesh_t const* mesh, char const* filename);
+#endif
+
+#endif /* __QUICKHULL_H__ */