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-rw-r--r--hacks/glx/gltrackball.c327
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diff --git a/hacks/glx/gltrackball.c b/hacks/glx/gltrackball.c
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-/* 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.
- */
-
-#include "screenhackI.h"
-
-#include <math.h>
-#include <stdlib.h>
-#include <string.h>
-
-# define Button4 4 /* WTF */
-# define Button5 5
-# define Button6 6
-# define Button7 7
-
-#include "trackball.h"
-#include "gltrackball.h"
-
-#if defined(HAVE_IPHONE) || defined(HAVE_ANDROID)
- /* Surely this should be defined somewhere more centrally... */
-# define HAVE_MOBILE
-#endif
-
-/* Bah, copied from ../fps.h */
-#ifdef HAVE_MOBILE
- extern double current_device_rotation (void);
-#else
-# define current_device_rotation() (0)
-#endif
-
-
-struct trackball_state {
- int ow, oh;
- double x, y;
- double dx, dy, ddx, ddy;
- GLfloat q[4];
- int button_down_p;
- int ignore_device_rotation_p;
-};
-
-/* 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.
- */
-trackball_state *
-gltrackball_init (int ignore_device_rotation_p)
-{
- trackball_state *ts = (trackball_state *) calloc (1, sizeof (*ts));
- if (!ts) return 0;
- ts->ignore_device_rotation_p = ignore_device_rotation_p;
- trackball (ts->q, 0, 0, 0, 0);
- return ts;
-}
-
-void
-gltrackball_free (trackball_state *ts)
-{
- free (ts);
-}
-
-
-/* Device rotation interacts very strangely with mouse positions.
- I'm not entirely sure this is the right fix.
- */
-static void
-adjust_for_device_rotation (trackball_state *ts,
- double *x, double *y, double *w, double *h)
-{
- int rot = (int) current_device_rotation();
- int swap;
-
- if (ts->ignore_device_rotation_p) return;
-
- while (rot <= -180) rot += 360;
- while (rot > 180) rot -= 360;
-
- if (rot > 135 || rot < -135) /* 180 */
- {
- *x = *w - *x;
- *y = *h - *y;
- }
- else if (rot > 45) /* 90 */
- {
- swap = *x; *x = *y; *y = swap;
- swap = *w; *w = *h; *h = swap;
- *x = *w - *x;
- }
- else if (rot < -45) /* 270 */
- {
- swap = *x; *x = *y; *y = swap;
- swap = *w; *w = *h; *h = swap;
- *y = *h - *y;
- }
-}
-
-
-/* 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.
- */
-void
-gltrackball_start (trackball_state *ts, int x, int y, int w, int h)
-{
- ts->x = x;
- ts->y = y;
- ts->button_down_p = 1;
- ts->dx = ts->ddx = 0;
- ts->dy = ts->ddy = 0;
-}
-
-/* Stop tracking the mouse: Call this when the mouse button goes up.
- */
-void
-gltrackball_stop (trackball_state *ts)
-{
- ts->button_down_p = 0;
-}
-
-static void
-gltrackball_track_1 (trackball_state *ts,
- double x, double y,
- int w, int h,
- int ignore_device_rotation_p)
-{
- double X = x;
- double Y = y;
- double W = w, W2 = w;
- double H = h, H2 = h;
- float q2[4];
- double ox = ts->x;
- double oy = ts->y;
-
- ts->x = x;
- ts->y = y;
-
- if (! ignore_device_rotation_p)
- {
- adjust_for_device_rotation (ts, &ox, &oy, &W, &H);
- adjust_for_device_rotation (ts, &X, &Y, &W2, &H2);
- }
- trackball (q2,
- (2 * ox - W) / W,
- (H - 2 * oy) / H,
- (2 * X - W) / W,
- (H - 2 * Y) / H);
-
- add_quats (q2, ts->q, ts->q);
-}
-
-
-/* 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.
- */
-void
-gltrackball_track (trackball_state *ts, int x, int y, int w, int h)
-{
- double dampen = 0.01; /* This keeps it going for about 3 sec */
- ts->dx = x - ts->x;
- ts->dy = y - ts->y;
- ts->ddx = ts->dx * dampen;
- ts->ddy = ts->dy * dampen;
- ts->ow = w;
- ts->oh = h;
- gltrackball_track_1 (ts, x, y, w, h, False);
-}
-
-
-static void
-gltrackball_dampen (double *n, double *dn)
-{
- int pos = (*n > 0);
- *n -= *dn;
- if (pos != (*n > 0))
- *n = *dn = 0;
-}
-
-
-/* Reset the trackball to the default unrotated state,
- plus an optional initial rotation.
- */
-void
-gltrackball_reset (trackball_state *ts, float x, float y)
-{
- int bd = ts->button_down_p;
- int ig = ts->ignore_device_rotation_p;
- memset (ts, 0, sizeof(*ts));
- ts->button_down_p = bd;
- ts->ignore_device_rotation_p = ig;
- trackball (ts->q, 0, 0, x, y);
-}
-
-
-/* Execute the rotations current encapsulated in the trackball_state:
- this does something analogous to glRotatef().
- */
-void
-gltrackball_rotate (trackball_state *ts)
-{
- GLfloat m[4][4];
- if (!ts->button_down_p &&
- (ts->ddx != 0 ||
- ts->ddy != 0))
- {
- /* Apply inertia: keep moving in the same direction as the last move. */
- gltrackball_track_1 (ts,
- ts->x + ts->dx,
- ts->y + ts->dy,
- ts->ow, ts->oh,
- False);
-
- /* Dampen inertia: gradually stop spinning. */
- gltrackball_dampen (&ts->dx, &ts->ddx);
- gltrackball_dampen (&ts->dy, &ts->ddy);
- }
-
- build_rotmatrix (m, ts->q);
- glMultMatrixf (&m[0][0]);
-}
-
-
-/* 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)
-{
- int up_p;
- int horizontal_p;
- int mx, my, move, scale;
-
-#ifdef HAVE_JWXYZ
- flip_p = 0; /* MacOS has already handled this. */
-#endif
-
- switch (button) {
- case Button4: up_p = 1; horizontal_p = 0; break;
- case Button5: up_p = 0; horizontal_p = 0; break;
- case Button6: up_p = 1; horizontal_p = 1; break;
- case Button7: up_p = 0; horizontal_p = 1; break;
- default: abort(); break;
- }
-
- if (flip_p)
- {
- horizontal_p = !horizontal_p;
- up_p = !up_p;
- }
-
- scale = mx = my = 1000;
- move = (up_p
- ? floor (scale * (1.0 - (percent / 100.0)))
- : ceil (scale * (1.0 + (percent / 100.0))));
- if (horizontal_p) mx = move;
- else my = move;
- gltrackball_start (ts, scale, scale, scale*2, scale*2);
- gltrackball_track (ts, mx, my, scale*2, scale*2);
-}
-
-void
-gltrackball_get_quaternion (trackball_state *ts, float q[4])
-{
- int i;
- for (i=0; i<4; i++)
- q[i] = ts->q[i];
-}
-
-
-/* A utility function for event-handler functions:
- Handles the various motion and click events related to trackballs.
- Returns True if the event was handled.
- */
-Bool
-gltrackball_event_handler (XEvent *event,
- trackball_state *ts,
- int window_width, int window_height,
- Bool *button_down_p)
-{
- if (event->xany.type == ButtonPress &&
- event->xbutton.button == Button1)
- {
- *button_down_p = True;
- gltrackball_start (ts,
- event->xbutton.x, event->xbutton.y,
- window_width, window_height);
- return True;
- }
- else if (event->xany.type == ButtonRelease &&
- event->xbutton.button == Button1)
- {
- *button_down_p = False;
- gltrackball_stop (ts);
- return True;
- }
- else if (event->xany.type == ButtonPress &&
- (event->xbutton.button == Button4 ||
- event->xbutton.button == Button5 ||
- event->xbutton.button == Button6 ||
- event->xbutton.button == Button7))
- {
- gltrackball_mousewheel (ts, event->xbutton.button, 10,
- !!event->xbutton.state);
- return True;
- }
- else if (event->xany.type == MotionNotify &&
- *button_down_p)
- {
- gltrackball_track (ts,
- event->xmotion.x, event->xmotion.y,
- window_width, window_height);
- return True;
- }
-
- return False;
-}
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