glutExtensionSupported - helps to easily determine whether
a given OpenGL extension is supported.

glutExtensionSupported
	glutExtensionSupported(name) -> int

int glutExtensionSupported(char *extension);

extension Name of OpenGL extension.

glutExtensionSupported helps to easily determine whether a
given  OpenGL extension is supported or not. The extension
parameter names the  extension  to  query.  The  supported
extensions    can   also   be   determined   with   glGet-
String(GL_EXTENSIONS), but glutExtensionSupported does the
correct parsing of the returned string.

glutExtensionSupported  returns  non-zero if the extension
is supported, zero if not supported.

There must be a valid current window  to  call  glutExten-
sionSupported.

glutExtensionSupported   only  returns  information  about
OpenGL extensions only. This means window system dependent
extensions  (for example, GLX extensions) are not reported
by glutExtensionSupported.

Here is an example of using glutExtensionSupported:

  if (!glutExtensionSupported("GL_EXT_texture")) {
    fprintf(stderr, "Missing the texture extension!\n");
    exit(1);
  }

Notice that the name argument includes both the GL  prefix
and the extension family prefix (EXT).

glutGet, glGetString

Mark J. Kilgard (mjk@nvidia.com)