1 files changed, 48 insertions, 0 deletions
diff --git a/hacks/glx/normals.h b/hacks/glx/normals.h
new file mode 100644
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--- /dev/null
+++ b/hacks/glx/normals.h
@@ -0,0 +1,48 @@
+/* normals, Copyright (c) 2002-2012 Jamie Zawinski <jwz@jwz.org>
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or 
+ * implied warranty.
+ *
+ * Compute normal vectors for arbitrary triangles.
+ */
+
+#ifndef __NORMALS_H__
+#define __NORMALS_H__
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#ifndef HAVE_JWXYZ
+# include <GL/gl.h>
+#endif
+
+#ifdef HAVE_ANDROID
+# include <GLES/gl.h>
+#endif
+
+#ifdef HAVE_JWZGLES
+# include "jwzgles.h"
+#endif /* HAVE_JWZGLES */
+
+typedef struct {
+  double x,y,z;
+} XYZ;
+
+/* Calculate the unit normal at p given two other points p1,p2 on the
+   surface. The normal points in the direction of p1 crossproduct p2
+ */
+extern XYZ calc_normal (XYZ p, XYZ p1, XYZ p2);
+
+/* Call glNormal3f() with a normal of the indicated triangle.
+ */
+extern void do_normal (GLfloat x1, GLfloat y1, GLfloat z1,
+                       GLfloat x2, GLfloat y2, GLfloat z2,
+                       GLfloat x3, GLfloat y3, GLfloat z3);
+
+#endif /* __NORMALS_H__ */