From d3a98cf6cbc3bd0b9efc570f58e8812c03931c18 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Tue, 16 Oct 2018 10:08:48 +0200
Subject: Original 5.40

---
 hacks/glx/gltrackball.h | 72 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 hacks/glx/gltrackball.h

(limited to 'hacks/glx/gltrackball.h')

diff --git a/hacks/glx/gltrackball.h b/hacks/glx/gltrackball.h
new file mode 100644
index 0000000..ba9e574
--- /dev/null
+++ b/hacks/glx/gltrackball.h
@@ -0,0 +1,72 @@
+/* gltrackball, Copyright (c) 2002-2017 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 (int ignore_device_rotation_p);
+
+/* 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);
+
+/* Stop tracking the mouse: Call this when the mouse button goes up.
+ */
+extern void gltrackball_stop (trackball_state *);
+
+/* Execute the rotations current encapsulated in the trackball_state:
+   this does something analagous to glRotatef().
+ */
+extern void gltrackball_rotate (trackball_state *);
+
+/* Call this when a mouse-wheel click is detected.
+   Clicks act like horizontal or vertical drags.
+   Percent is the length of the drag as a percentage of the screen size.
+   Button is 'Button4' or 'Button5' (for the vertical wheel)
+   or 'Button5' or 'Button6' (for the horizontal wheel).
+   If `flip_p' is true, swap the horizontal and vertical axes.
+ */
+void gltrackball_mousewheel (trackball_state *ts,
+                             int button, int percent, int flip_p);
+
+/* Return the quaternion encapsulated by the trackball state.
+ */
+extern void gltrackball_get_quaternion (trackball_state *ts, float q[4]);
+
+/* Reset the trackball to the default unrotated state,
+   plus an optional initial rotation.
+ */
+extern void gltrackball_reset (trackball_state *ts, float x, float y);
+
+/* A utility function for event-handler functions:
+   Handles the various motion and click events related to trackballs.
+   Returns True if the event was handled.
+ */
+extern Bool gltrackball_event_handler (XEvent *,
+                                       trackball_state *,
+                                       int window_width, int window_height,
+                                       Bool *button_down_p);
+
+#endif /* __GLTRACKBALL_H__ */
-- 
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