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

[xscreensaver] / hacks / glx / stairs.c

diff --git a/hacks/glx/stairs.c b/hacks/glx/stairs.c
index b300ee13c1126b57c3ea588cb091b1b1616c69d5..2dd78b873d40f28096c46803896756e347051bca 100644 (file)
--- a/hacks/glx/stairs.c
+++ b/hacks/glx/stairs.c
@@ -60,6 +60,7 @@ static const char sccsid[] = "@(#)stairs.c    4.07 97/11/24 xlockmore";
                                                        "*showFPS:      False   \n"
 
 # define refresh_stairs 0
+# define release_stairs 0
 # include "xlockmore.h"                /* from the xscreensaver distribution */
 #else /* !STANDALONE */
 # include "xlock.h"                    /* from the xlockmore distribution */
@@ -83,7 +84,7 @@ ENTRYPOINT ModeSpecOpt stairs_opts =
 
 #ifdef USE_MODULES
 ModStruct   stairs_description =
-{"stairs", "init_stairs", "draw_stairs", "release_stairs",
+{"stairs", "init_stairs", "draw_stairs", NULL,
  "draw_stairs", "change_stairs", NULL, &stairs_opts,
  1000, 1, 1, 1, 4, 1.0, "",
  "Shows Infinite Stairs, an Escher-like scene", 0, NULL};
@@ -343,47 +344,18 @@ stairs_handle_event (ModeInfo *mi, XEvent *event)
 {
   stairsstruct *sp = &stairs[MI_SCREEN(mi)];
 
-  if (event->xany.type == ButtonPress &&
-      event->xbutton.button == Button1)
-    {
-      sp->button_down_p = True;
-      gltrackball_start (sp->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)
-    {
-      sp->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 (sp->trackball, event->xbutton.button, 10,
-                              !!event->xbutton.state);
-      return True;
-    }
-  else if (event->xany.type == MotionNotify &&
-           sp->button_down_p)
-    {
-      gltrackball_track (sp->trackball,
-                         event->xmotion.x, event->xmotion.y,
-                         MI_WIDTH (mi), MI_HEIGHT (mi));
-      return True;
-    }
+  if (gltrackball_event_handler (event, sp->trackball,
+                                 MI_WIDTH (mi), MI_HEIGHT (mi),
+                                 &sp->button_down_p))
+    return True;
   else if (event->xany.type == KeyPress)
     {
       KeySym keysym;
       char c = 0;
       XLookupString (&event->xkey, &c, 1, &keysym, 0);
-      if (c == ' ')
+      if (c == ' ' || c == '\t')
         {
-          gltrackball_reset (sp->trackball);
+          gltrackball_reset (sp->trackball, 0, 0);
           return True;
         }
     }
@@ -460,17 +432,15 @@ pinit(ModeInfo *mi)
        glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_specular);
 }
 
+static void free_stairs (ModeInfo * mi);
+
 ENTRYPOINT void
 init_stairs (ModeInfo * mi)
 {
        int         screen = MI_SCREEN(mi);
        stairsstruct *sp;
 
-       if (stairs == NULL) {
-               if ((stairs = (stairsstruct *) calloc(MI_NUM_SCREENS(mi),
-                                            sizeof (stairsstruct))) == NULL)
-                       return;
-       }
+       MI_INIT (mi, stairs, free_stairs);
        sp = &stairs[screen];
 
        sp->step = 0.0;
@@ -489,7 +459,7 @@ init_stairs (ModeInfo * mi)
                MI_CLEARWINDOW(mi);
        }
 
-    sp->trackball = gltrackball_init ();
+    sp->trackball = gltrackball_init (False);
 }
 
 ENTRYPOINT void
@@ -511,12 +481,6 @@ draw_stairs (ModeInfo * mi)
        glPushMatrix();
 
     glRotatef(rot, 0, 0, 1);
-    if ((rot >  45 && rot <  135) ||
-        (rot < -45 && rot > -135))
-      {
-        GLfloat s = MI_WIDTH(mi) / (GLfloat) MI_HEIGHT(mi);
-        glScalef (s, 1/s, 1);
-      }
 
        glTranslatef(0.0, 0.0, -10.0);
 
@@ -526,6 +490,14 @@ draw_stairs (ModeInfo * mi)
                glScalef(Scale4Iconic * sp->WindH / sp->WindW, Scale4Iconic, Scale4Iconic);
        }
 
+# ifdef HAVE_MOBILE    /* Keep it the same relative size when rotated. */
+  {
+    GLfloat h = MI_HEIGHT(mi) / (GLfloat) MI_WIDTH(mi);
+    if (rot != 0 && rot != 180 && rot != -180)
+      glScalef (1/h, 1/h, 1/h);
+  }
+# endif
+
     gltrackball_rotate (sp->trackball);
 
     glTranslatef(0, 0.5, 0);
@@ -605,21 +577,13 @@ change_stairs (ModeInfo * mi)
 }
 #endif /* !STANDALONE */
 
-ENTRYPOINT void
-release_stairs (ModeInfo * mi)
+static void
+free_stairs (ModeInfo * mi)
 {
-       if (stairs != NULL) {
-      int i;
-      for (i = 0; i < MI_NUM_SCREENS(mi); i++) {
-        stairsstruct *sp = &stairs[i];
-        if (glIsList(sp->objects)) {
-          glDeleteLists(sp->objects, 1);
-        }
-      }
-      free(stairs);
-      stairs = NULL;
+       stairsstruct *sp = &stairs[MI_SCREEN(mi)];
+       if (glIsList(sp->objects)) {
+               glDeleteLists(sp->objects, 1);
        }
-       FreeAllGL(mi);
 }
 
 XSCREENSAVER_MODULE ("Stairs", stairs)