1 files changed, 74 insertions, 0 deletions
diff --git a/hacks/glx/xscreensaver-gl-helper.c b/hacks/glx/xscreensaver-gl-helper.c
new file mode 100644
index 0000000..6da8a7f
--- /dev/null
+++ b/hacks/glx/xscreensaver-gl-helper.c
@@ -0,0 +1,74 @@
+/* xscreensaver, Copyright (c) 2000, 2002 by 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
+ * 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.
+ */
+
+/* xscreensaver-gl-helper -- prints the ID of the best visual to use
+   for GL programs on stdout.
+ */
+
+#include "utils.h"
+#include "visual.h"
+
+#include <GL/gl.h>
+#include <GL/glx.h>
+
+char *progname = 0;
+char *progclass = "XScreenSaver";
+
+int
+main (int argc, char **argv)
+{
+  Display *dpy;
+  Screen *screen;
+  Visual *visual;
+  char *d = getenv ("DISPLAY");
+  int i;
+
+  progname = argv[0];
+  for (i = 1; i < argc; i++)
+    {
+      if (argv[i][0] == '-' && argv[i][1] == '-') argv[i]++;
+      if (strlen(argv[i]) >= 2 &&
+          !strncmp ("-display", argv[i], strlen(argv[i])))
+        {
+          if (i == argc-1) goto LOSE;
+          d = argv[i+1];
+          i++;
+        }
+      else
+        {
+         LOSE:
+          fprintf (stderr, "usage: %s [ -display host:dpy.screen ]\n",
+                   progname);
+          fprintf (stderr,
+                   "This program prints out the ID of the best "
+                   "X visual for GL programs to use.\n");
+          exit (1);
+        }
+    }
+
+  dpy = XOpenDisplay (d);
+  if (!dpy)
+    {
+      fprintf (stderr, "%s: couldn't open display %s\n", progname,
+               (d ? d : "(null)"));
+      exit (1);
+    }
+
+  screen = DefaultScreenOfDisplay (dpy);
+  visual = get_gl_visual (screen);
+
+  if (visual)
+    printf ("0x%x\n", (unsigned int) XVisualIDFromVisual (visual));
+  else
+    printf ("none\n");
+
+  exit (0);
+}