http://packetstormsecurity.org/UNIX/admin/xscreensaver-4.04.2.tar.gz

[xscreensaver] / hacks / glx / gltrackball.h

diff --git a/hacks/glx/gltrackball.h b/hacks/glx/gltrackball.h
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+/* gltrackball, Copyright (c) 2002 Jamie Zawinski <jwz@jwz.org>
+ * GL-flavored wrapper for trackball.c
+ *
+ * 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.
+ */
+
+#ifndef __GLTRACKBALL_H__
+#define __GLTRACKBALL_H__
+
+typedef struct trackball_state trackball_state;
+
+/* Returns a trackball_state object, which encapsulates the stuff necessary
+   to make dragging the mouse on the window of a GL program do the right thing.
+ */
+extern trackball_state *gltrackball_init (void);
+
+/* Begin tracking the mouse: Call this when the mouse button goes down.
+   x and y are the mouse position relative to the window.
+   w and h are the size of the window.
+ */
+extern void gltrackball_start (trackball_state *, int x, int y, int w, int h);
+
+/* Track the mouse: Call this each time the mouse moves with the button down.
+   x and y are the new mouse position relative to the window.
+   w and h are the size of the window.
+ */
+extern void gltrackball_track (trackball_state *, int x, int y, int w, int h);
+
+/* Execute the rotations current encapsulated in the trackball_state:
+   this does something analagous to glRotatef().
+ */
+extern void gltrackball_rotate (trackball_state *);
+
+#endif /* __GLTRACKBALL_H__ */
+