From http://www.jwz.org/xscreensaver/xscreensaver-5.38.tar.gz

[xscreensaver] / hacks / glx / stairs.c

diff --git a/hacks/glx/stairs.c b/hacks/glx/stairs.c
index 2dd78b873d40f28096c46803896756e347051bca..49a1542fc81509a26867916824757714ea846c0d 100644 (file)
--- a/hacks/glx/stairs.c
+++ b/hacks/glx/stairs.c
@@ -59,7 +59,6 @@ static const char sccsid[] = "@(#)stairs.c    4.07 97/11/24 xlockmore";
 # define DEFAULTS                      "*delay:                20000   \n" \
                                                        "*showFPS:      False   \n"
 
-# define refresh_stairs 0
 # define release_stairs 0
 # include "xlockmore.h"                /* from the xscreensaver distribution */
 #else /* !STANDALONE */
@@ -85,7 +84,7 @@ ENTRYPOINT ModeSpecOpt stairs_opts =
 #ifdef USE_MODULES
 ModStruct   stairs_description =
 {"stairs", "init_stairs", "draw_stairs", NULL,
- "draw_stairs", "change_stairs", NULL, &stairs_opts,
+ "draw_stairs", "change_stairs", "free_stairs", &stairs_opts,
  1000, 1, 1, 1, 4, 1.0, "",
  "Shows Infinite Stairs, an Escher-like scene", 0, NULL};
 
@@ -321,8 +320,14 @@ ENTRYPOINT void
 reshape_stairs (ModeInfo * mi, int width, int height)
 {
        stairsstruct *sp = &stairs[MI_SCREEN(mi)];
+    int y = 0;
 
-       glViewport(0, 0, sp->WindW = (GLint) width, sp->WindH = (GLint) height);
+    if (width > height * 5) {   /* tiny window: show middle */
+      height = width;
+      y = -height/2;
+    }
+
+       glViewport(0, y, sp->WindW = (GLint) width, sp->WindH = (GLint) height);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 15.0);
@@ -432,15 +437,13 @@ 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;
 
-       MI_INIT (mi, stairs, free_stairs);
+       MI_INIT (mi, stairs);
        sp = &stairs[screen];
 
        sp->step = 0.0;
@@ -577,7 +580,7 @@ change_stairs (ModeInfo * mi)
 }
 #endif /* !STANDALONE */
 
-static void
+ENTRYPOINT void
 free_stairs (ModeInfo * mi)
 {
        stairsstruct *sp = &stairs[MI_SCREEN(mi)];