[Mesa-dev] [PATCH] anv: enable sampling from fast-cleared images on SKL

[Samuel Iglesias Gonsálvez]

On Thu, 2017-03-23 at 11:09 -0700, Nanley Chery wrote:
> On Thu, Mar 23, 2017 at 12:25:28PM +0100, Samuel Iglesias Gonsálvez
> wrote:
> > A resolve is not needed on Skylake in this case. We were forcing
> > a resolve because we set the input_aux_usage to ISL_AUX_USAGE_NONE.
> > 
> > Signed-off-by: Samuel Iglesias Gonsálvez <siglesias at igalia.com>
> > ---
> > 
> > This doesn't fix the problem with BDW but I found it while
> > reviewing
> > the code.
> > 
> >  src/intel/vulkan/genX_cmd_buffer.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/src/intel/vulkan/genX_cmd_buffer.c
> > b/src/intel/vulkan/genX_cmd_buffer.c
> > index e2364dbfd52..39856b9af7c 100644
> > --- a/src/intel/vulkan/genX_cmd_buffer.c
> > +++ b/src/intel/vulkan/genX_cmd_buffer.c
> > @@ -305,8 +305,8 @@ color_attachment_compute_aux_usage(struct
> > anv_device *device,
> >            * doesn't also support color compression.
> >            */
> >           att_state->input_aux_usage = ISL_AUX_USAGE_NONE;
> > -      } else if (GEN_GEN == 8) {
> > -         /* Broadwell can sample from fast-cleared images */
> > +      } else if (GEN_GEN >= 8) {
> > +         /* Broadwell/Skylake can sample from fast-cleared images
> > */
> >           att_state->input_aux_usage = ISL_AUX_USAGE_CCS_D;
> 
> This doesn't work in all cases. SKL can only sample from CCS_D if the
> format is supported for CCS_E.
> 

It is already covered. The 'if' condition before this is triggered only
if gen9+ and format doesn't support CCS_E, so if you end up here in
gen9+ is because the format supports CCS_E.

> By the way, I actually have a work-in-progress branch that has a
> patch to do this:
> https://cgit.freedesktop.org/~nchery/mesa/commit/?h=ccs-layouts/1-ccs
> d-layout&id=e428f44e1835cb00f52848d09350957ef6f73495
> 

This is a similar solution to this bug. If you prefer to stick with
yours, please add my R-b to it:

Reviewed-by: Samuel Iglesias Gonsálvez <siglesias at igalia.com>

Sam
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