[Mesa-dev] [PATCH 2/8] intel: Add functions for checking if objs have hiz enabled

[Eric Anholt]

Kenneth Graunke <kenneth at whitecape.org> writes:

> From: Chad Versace <chad.versace at linux.intel.com>
>
> On Haswell, HiZ will selectively be enabled on individual miptree slices
> to workaround a hardware bug. The two new functions below will permit us
> to detect if hiz is enabled for a particular slice.
>
>   intel_miptree_slice_has_hiz
>   intel_renderbuffer_has_hiz
>
> The functions are not yet used.
>
> Signed-off-by: Chad Versace <chad.versace at linux.intel.com>
> ---
>  src/mesa/drivers/dri/intel/intel_fbo.c         | 10 ++++++++++
>  src/mesa/drivers/dri/intel/intel_fbo.h         |  3 +++
>  src/mesa/drivers/dri/intel/intel_mipmap_tree.c | 12 ++++++++++++
>  src/mesa/drivers/dri/intel/intel_mipmap_tree.h | 11 +++++++++--
>  4 files changed, 34 insertions(+), 2 deletions(-)
>
> diff --git a/src/mesa/drivers/dri/intel/intel_fbo.c b/src/mesa/drivers/dri/intel/intel_fbo.c
> index 2977568..0e2ded5 100644
> --- a/src/mesa/drivers/dri/intel/intel_fbo.c
> +++ b/src/mesa/drivers/dri/intel/intel_fbo.c
> @@ -943,6 +943,16 @@ intel_renderbuffer_set_needs_downsample(struct intel_renderbuffer *irb)
>        irb->mt->need_downsample = true;
>  }
>  
> +/**
> + * Does the renderbuffer have hiz enabled?
> + */
> +bool
> +intel_renderbuffer_has_hiz(struct intel_renderbuffer *irb)
> +{
> +   return irb->mt &&
> +          intel_miptree_slice_has_hiz(irb->mt, irb->mt_level, irb->mt_layer);
> +}

irb->mt should always be non-null -- a renderbuffer without that should
never exist.
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