1 files changed, 48 insertions, 0 deletions
diff --git a/src/glut/glx/glut_glxext.c b/src/glut/glx/glut_glxext.c
new file mode 100644
index 00000000000..04862432fc1
--- /dev/null
+++ b/src/glut/glx/glut_glxext.c
@@ -0,0 +1,48 @@
+
+/* Copyright (c) Mark J. Kilgard, 1997. */
+
+/* This program is freely distributable without licensing fees
+   and is provided without guarantee or warrantee expressed or
+   implied. This program is -not- in the public domain. */
+
+#include <stdlib.h>
+#include <string.h>
+#include "glutint.h"
+
+#if defined(GLX_VERSION_1_1)
+int
+__glutIsSupportedByGLX(char *extension)
+{
+  static const char *extensions = NULL;
+  const char *start;
+  char *where, *terminator;
+  int major, minor;
+
+  glXQueryVersion(__glutDisplay, &major, &minor);
+  /* Be careful not to call glXQueryExtensionsString if it
+     looks like the server doesn't support GLX 1.1.
+     Unfortunately, the original GLX 1.0 didn't have the notion
+     of GLX extensions. */
+  if ((major == 1 && minor >= 1) || (major > 1)) {
+    if (!extensions)
+      extensions = glXQueryExtensionsString(__glutDisplay, __glutScreen);
+    /* It takes a bit of care to be fool-proof about parsing
+       the GLX extensions string.  Don't be fooled by
+       sub-strings,  etc. */
+    start = extensions;
+    for (;;) {
+      where = strstr(start, extension);
+      if (!where)
+        return 0;
+      terminator = where + strlen(extension);
+      if (where == start || *(where - 1) == ' ') {
+        if (*terminator == ' ' || *terminator == '\0') {
+          return 1;
+        }
+      }
+      start = terminator;
+    }
+  }
+  return 0;
+}
+#endif