[Mesa-dev] [PATCH] mesa/st: Fix frontbuffer rendering regression

[Cherniak, Bruce]

Reviewed-by: Bruce Cherniak <bruce.cherniak at intel.com> 

> On Sep 7, 2017, at 3:53 AM, Thomas Hellstrom <thellstrom at vmware.com> wrote:
> 
> This fixes a regression introduced with commit
> eceb6710024716433069d705fbd873d6d136c2cc:
> "mesa/st: Reduce the number of frontbuffer flush calls"
> where we, after flushing the front buffer marked it as not-rendered-to,
> the idea being that it should be marked as "rendered-to" again as soon as
> any rendering was touching the front.
> 
> Now the latter part never happened, because it was part of a state
> validation and we never marked that part of the state as dirty.
> 
> So mark the framebuffer state dirty after a frontbuffer flush.
> (fdo bugzilla 102496)
> 
> Signed-off-by: Thomas Hellstrom <thellstrom at vmware.com>
> Tested-by: Dieter Nützel <Dieter at nuetzel-hh.de>
> Tested-by: Bruce Cherniak <bruce.cherniak at intel.com>
> Tested-By: Gert Wollny <gw.fossdev at gmail.com>
> ---
> src/mesa/state_tracker/st_manager.c | 3 +++
> 1 file changed, 3 insertions(+)
> 
> diff --git a/src/mesa/state_tracker/st_manager.c b/src/mesa/state_tracker/st_manager.c
> index 07c430d..6c7d836 100644
> --- a/src/mesa/state_tracker/st_manager.c
> +++ b/src/mesa/state_tracker/st_manager.c
> @@ -1044,6 +1044,9 @@ st_manager_flush_frontbuffer(struct st_context *st)
>       stfb->iface->flush_front(&st->iface, stfb->iface,
>                                ST_ATTACHMENT_FRONT_LEFT);
>       strb->defined = GL_FALSE;
> +
> +      /* Trigger an update of strb->defined on next draw */
> +      st->dirty |= ST_NEW_FB_STATE;
>    }
> }
> 
> -- 
> 2.7.4
> 
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