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

[xscreensaver] / hacks / glx / pipes.c

diff --git a/hacks/glx/pipes.c b/hacks/glx/pipes.c
index 77be33e1fce2ed41c40b4ea451b4e3f0aea39df0..24f9a2a093bf9602c7699a1481b77ed5cf19d403 100644 (file)
--- a/hacks/glx/pipes.c
+++ b/hacks/glx/pipes.c
@@ -68,7 +68,6 @@ static const char sccsid[] = "@(#)pipes.c     4.07 97/11/24 xlockmore";
                        "*wireframe:    False   \n"                 \
                                        "*suppressRotationAnimation: True\n" \
 
-# define refresh_pipes 0
 # define release_pipes 0
 # include "xlockmore.h"                                /* from the xscreensaver distribution */
 #else  /* !STANDALONE */
@@ -135,7 +134,7 @@ ENTRYPOINT ModeSpecOpt pipes_opts =
 ModStruct   pipes_description =
 {"pipes", "init_pipes", "draw_pipes", NULL,
  "draw_pipes",
- "change_pipes", NULL, &pipes_opts,
+ "change_pipes", "free_pipes", &pipes_opts,
  1000, 2, 5, 500, 4, 1.0, "",
  "Shows a selfbuilding pipe system", 0, NULL};
 
@@ -656,12 +655,20 @@ pinit(ModeInfo * mi, int zera)
 ENTRYPOINT void
 reshape_pipes(ModeInfo * mi, int width, int height)
 {
-       glViewport(0, 0, width, (GLint) height);
-       glMatrixMode(GL_PROJECTION);
-       glLoadIdentity();
-       /*glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 15.0); */
-       gluPerspective(65.0, (GLfloat) width / (GLfloat) height, 0.1, 20.0);
-       glMatrixMode(GL_MODELVIEW);
+  double h = (GLfloat) height / (GLfloat) width;  
+  int y = 0;
+
+  if (width > height * 5) {   /* tiny window: show middle */
+    height = width * 9/16;
+    y = -height/2;
+    h = height / (GLfloat) width;
+  }
+  glViewport(0, y, width, (GLint) height);
+  glMatrixMode(GL_PROJECTION);
+  glLoadIdentity();
+  /*glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 15.0); */
+  gluPerspective(65.0, 1/h, 0.1, 20.0);
+  glMatrixMode(GL_MODELVIEW);
 
   glClear(GL_COLOR_BUFFER_BIT);
 }
@@ -689,15 +696,13 @@ pipes_handle_event (ModeInfo *mi, XEvent *event)
 static void generate_system (ModeInfo *);
 
 
-static void free_pipes (ModeInfo *);
-
 ENTRYPOINT void
 init_pipes (ModeInfo * mi)
 {
        int         screen = MI_SCREEN(mi);
        pipesstruct *pp;
 
-       MI_INIT (mi, pipes, free_pipes);
+       MI_INIT (mi, pipes);
        pp = &pipes[screen];
 
        pp->window = MI_WINDOW(mi);
@@ -1167,7 +1172,7 @@ change_pipes (ModeInfo * mi)
 #endif /* !STANDALONE */
 
 
-static void
+ENTRYPOINT void
 free_pipes (ModeInfo * mi)
 {
        pipesstruct *pp = &pipes[MI_SCREEN(mi)];