From http://www.jwz.org/xscreensaver/xscreensaver-5.37.tar.gz

[xscreensaver] / hacks / glx / boing.c

diff --git a/hacks/glx/boing.c b/hacks/glx/boing.c
index 1c95d1ead8c269a244ca622049cabbe28ec0134a..22d512bf808ae1219c323751bfe0967f0d0d3655 100644 (file)
--- a/hacks/glx/boing.c
+++ b/hacks/glx/boing.c
@@ -1,4 +1,4 @@
-/* boing, Copyright (c) 2005-2008 Jamie Zawinski <jwz@jwz.org>
+/* boing, Copyright (c) 2005-2014 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
@@ -62,6 +62,8 @@ typedef struct {
   trackball_state *trackball;
   Bool button_down_p;
 
+  GLfloat speed;
+
   GLuint ball_list;
   double ball_x,   ball_y,   ball_z,   ball_th;
   double ball_dx,  ball_dy,  ball_dz,  ball_dth;
@@ -109,6 +111,8 @@ static XrmOptionDescRec opts[] = {
   { "-ball-color2",".ballColor2",XrmoptionSepArg, 0 },
   { "-grid-color", ".gridColor", XrmoptionSepArg, 0 },
   { "-shadow-color",".shadowColor",XrmoptionSepArg, 0 },
+  { "-background",  ".boingBackground",XrmoptionSepArg, 0 },
+  { "-bg",          ".boingBackground",XrmoptionSepArg, 0 },
 };
 
 static argtype vars[] = {
@@ -376,7 +380,7 @@ draw_scanlines (ModeInfo *mi)
       int lh, ls;
       int y;
       glLoadIdentity();
-      gluOrtho2D (0, w, 0, h);
+      glOrtho (0, w, 0, h, -1, 1);
 
       if      (h > 500) lh = 4, ls = 4;
       else if (h > 300) lh = 2, ls = 1;
@@ -427,10 +431,10 @@ tick_physics (ModeInfo *mi)
   bp->ball_x  += bp->ball_dx;
   if      (bp->ball_x < min) bp->ball_x = min, bp->ball_dx = -bp->ball_dx,
     bp->ball_dth = -bp->ball_dth,
-    bp->ball_dx += (frand(speed/2) - speed);
+    bp->ball_dx += (frand(bp->speed/2) - bp->speed);
   else if (bp->ball_x > max) bp->ball_x = max, bp->ball_dx = -bp->ball_dx,
     bp->ball_dth = -bp->ball_dth,
-    bp->ball_dx += (frand(speed/2) - speed);
+    bp->ball_dx += (frand(bp->speed/2) - bp->speed);
 
   bp->ball_dy += bp->ball_ddy;
   bp->ball_y  += bp->ball_dy;
@@ -459,6 +463,13 @@ reshape_boing (ModeInfo *mi, int width, int height)
 
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
+
+  if (height > width)
+    {
+      GLfloat s = width / (GLfloat) height;
+      glScalef (s, s, s);
+    }
+
   gluPerspective (8.0, 1/h, 1.0, 10.0);
 
   glMatrixMode(GL_MODELVIEW);
@@ -476,39 +487,10 @@ boing_handle_event (ModeInfo *mi, XEvent *event)
 {
   boing_configuration *bp = &bps[MI_SCREEN(mi)];
 
-  if (event->xany.type == ButtonPress &&
-      event->xbutton.button == Button1)
-    {
-      bp->button_down_p = True;
-      gltrackball_start (bp->trackball,
-                         event->xbutton.x, event->xbutton.y,
-                         MI_WIDTH (mi), MI_HEIGHT (mi));
-      return True;
-    }
-  else if (event->xany.type == ButtonRelease &&
-           event->xbutton.button == Button1)
-    {
-      bp->button_down_p = False;
-      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 (bp->trackball, event->xbutton.button, 10,
-                              !!event->xbutton.state);
-      return True;
-    }
-  else if (event->xany.type == MotionNotify &&
-           bp->button_down_p)
-    {
-      gltrackball_track (bp->trackball,
-                         event->xmotion.x, event->xmotion.y,
-                         MI_WIDTH (mi), MI_HEIGHT (mi));
-      return True;
-    }
+  if (gltrackball_event_handler (event, bp->trackball,
+                                 MI_WIDTH (mi), MI_HEIGHT (mi),
+                                 &bp->button_down_p))
+    return True;
 
   return False;
 }
@@ -520,14 +502,7 @@ init_boing (ModeInfo *mi)
   boing_configuration *bp;
   int wire = MI_IS_WIREFRAME(mi);
 
-  if (!bps) {
-    bps = (boing_configuration *)
-      calloc (MI_NUM_SCREENS(mi), sizeof (boing_configuration));
-    if (!bps) {
-      fprintf(stderr, "%s: out of memory\n", progname);
-      exit(1);
-    }
-  }
+  MI_INIT (mi, bps, NULL);
 
   bp = &bps[MI_SCREEN(mi)];
 
@@ -588,18 +563,18 @@ init_boing (ModeInfo *mi)
 
   glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 
-  speed = speed / 800.0;
+  bp->speed = speed / 800.0;
 
-  bp->ball_dth = (spin ? -speed * 7 * 360 : 0);
+  bp->ball_dth = (spin ? -bp->speed * 7 * 360 : 0);
 
   bp->ball_x   = 0.5 - ((ball_size/2) + frand(1-ball_size));
   bp->ball_y   = 0.2;
-  bp->ball_dx  = speed * 6 + frand(speed);
-  bp->ball_ddy = -speed;
+  bp->ball_dx  = bp->speed * 6 + frand(bp->speed);
+  bp->ball_ddy = -bp->speed;
 
-  bp->ball_dz  = speed * 6 + frand(speed);
+  bp->ball_dz  = bp->speed * 6 + frand(bp->speed);
 
-  bp->trackball = gltrackball_init ();
+  bp->trackball = gltrackball_init (False);
 }
 
 
@@ -627,6 +602,20 @@ draw_boing (ModeInfo *mi)
     tick_physics (mi);
 
   glPushMatrix ();
+
+  {
+    double rot = current_device_rotation();
+    glRotatef(rot, 0, 0, 1);
+/*
+    if ((rot >  45 && rot <  135) ||
+        (rot < -45 && rot > -135))
+      {
+        GLfloat s = MI_WIDTH(mi) / (GLfloat) MI_HEIGHT(mi);
+        glScalef (1/s, s, 1);
+      }
+*/
+  }
+
   gltrackball_rotate (bp->trackball);
 
   glLightfv (GL_LIGHT0, GL_POSITION, bp->lightpos);