[Mesa-dev] [PATCH] i965/gen6/xfb: handle case where transform feedback is not active

[andrey simiklit]

Hi all,

This workaround just helps me to avoid the graphical corruption on SNB but
I not sure is it good idea.

Regards,
Andrii.

On Wed, Aug 15, 2018 at 6:20 PM, <asimiklit.work at gmail.com> wrote:

> From: Andrii Simiklit <asimiklit.work at gmail.com>
>
> When the SVBI Payload Enable is false I guess the register R1.4
> which contains the Maximum Streamed Vertex Buffer Index is filled by zero
> and GS stops to write transform feedback when the transform feedback
> is not active.
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107579
> Signed-off-by: Andrii Simiklit <andrii.simiklit at globallogic.com>
> ---
>  src/mesa/drivers/dri/i965/genX_state_upload.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/src/mesa/drivers/dri/i965/genX_state_upload.c
> b/src/mesa/drivers/dri/i965/genX_state_upload.c
> index ea5ad55..0f82500 100644
> --- a/src/mesa/drivers/dri/i965/genX_state_upload.c
> +++ b/src/mesa/drivers/dri/i965/genX_state_upload.c
> @@ -2806,7 +2806,7 @@ genX(upload_gs_state)(struct brw_context *brw)
>  #if GEN_GEN < 7
>           gs.SOStatisticsEnable = true;
>           if (gs_prog->info.has_transform_feedback_varyings)
> -            gs.SVBIPayloadEnable = true;
> +            gs.SVBIPayloadEnable = _mesa_is_xfb_active_and_unpaused(ctx);
>
>           /* GEN6_GS_SPF_MODE and GEN6_GS_VECTOR_MASK_ENABLE are enabled
> as it
>            * was previously done for gen6.
> --
> 2.7.4
>
>
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