[xserver patch v4 3/5] glx: Enforce a 1:1 correspondence between GLX and X11 windows.

[Jesse Barnes]

On Mon,  8 Feb 2010 19:25:14 +0100
Francisco Jerez <currojerez at riseup.net> wrote:

> The spec says (regarding glXCreateWindow): "If there is already a
> GLXFBConfig associated with win (as a result of a previous
> glXCreateWindow call), then a BadAlloc error is generated.". It will
> also come useful to implement DRI2InvalidateBuffers for the indirect
> case.
> 
> Signed-off-by: Francisco Jerez <currojerez at riseup.net>
> ---
>  glx/glxcmds.c   |   51 +++++++++++++++++++++++++++++++++++++++++++++------
>  glx/glxserver.h |    1 +
>  2 files changed, 46 insertions(+), 6 deletions(-)
> 
> diff --git a/glx/glxcmds.c b/glx/glxcmds.c
> index 77afbf4..0e1c89c 100644
> --- a/glx/glxcmds.c
> +++ b/glx/glxcmds.c
> @@ -51,6 +51,15 @@
>  #include "indirect_table.h"
>  #include "indirect_util.h"
>  
> +static int glxWindowPrivateKeyIndex;
> +static DevPrivateKey glxWindowPrivateKey = &glxWindowPrivateKeyIndex;
> +
> +__GLXdrawable *
> +glxGetDrawableFromWindow(WindowPtr pWin)
> +{
> +	return dixLookupPrivate(&pWin->devPrivates, glxWindowPrivateKey);
> +}

Thanks for pointing this out.  Can we use this in
glxscreens.c:glxDestroyWindow() to invalidate the drawable pointer in
the glx drawable at window destroy time?  That would be a good way to
fix https://bugs.freedesktop.org/show_bug.cgi?id=26394; probably better
than trying to mix in (or totally switch to) XIDs for tracking things.

-- 
Jesse Barnes, Intel Open Source Technology Center