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

[Eric Anholt]

Chad Versace <chad.versace at linux.intel.com> writes:

> On 04/09/2013 04:03 PM, Eric Anholt wrote:
>> 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.
>
> Is that true for i915? I've never understood i915.

Yes.
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