[PATCH] Add -iglx & +iglx to Xserver.man

[Robert Morell]

On Tue, Nov 25, 2014 at 07:26:14PM -0800, Alan Coopersmith wrote:
> Covers the current state after commits 99f0365b1fbdfd9238b9f,
> d0da0e9c3bb8fe0cd4879, & e3aa13b8d63ea2fba6eb4 were all applied.
> 
> Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
> ---
>  man/Xserver.man |   10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/man/Xserver.man b/man/Xserver.man
> index c03830c..69ff626 100644
> --- a/man/Xserver.man
> +++ b/man/Xserver.man
> @@ -181,6 +181,16 @@ prints a usage message.
>  .B \-I
>  causes all remaining command line arguments to be ignored.
>  .TP 8
> +.B \-iglx
> +Prohibit creating indirect GLX contexts.  Indirect GLX is of limited use,
> +since it only supports up to OpenGL 1.4; it's slower than direct contexts;

Technically, there exists protocol for much if not all of OpenGL 2.1,
and some extensions beyond that.  But not all server and client
implementations support it...

> +and it opens a large attack surface for protocol parsing errors.
> +This is the default unless +iglx is specified, though it may not be honored
> +by GLX implementations other than the one provided with the X server.

For what it's worth, in case anyone finds this thread in the archives,
I'll point out that NVIDIA's implementation does honor this option in
newer drivers, which contain the following entry in the changelog:

    * Implemented support for disabling indirect GLX context creation using
      the -iglx option available on X.Org server release 1.16 and newer.  Note
      that future X.Org server releases may make the -iglx option the default.
      To re-enable support for indirect GLX on such servers, use the +iglx
      option.

But your text above is still accurate, so other than perhaps softening
the OpenGL 1.4 limitation,

Reviewed-by: Robert Morell <rmorell at nvidia.com>

> +.TP 8
> +.B +iglx
> +Allow creating indirect GLX contexts.
> +.TP 8
>  .B \-maxbigreqsize \fIsize\fP
>  sets the maximum big request to
>  .I size
> -- 
> 1.7.9.2