[Mesa-dev] [PATCH 15/30] i965/miptree: Add new entrypoints for resolve management
Jason Ekstrand
jason at jlekstrand.net
Wed May 31 19:11:58 UTC 2017
On Wed, May 31, 2017 at 11:09 AM, Pohjolainen, Topi <
topi.pohjolainen at gmail.com> wrote:
> On Wed, May 31, 2017 at 09:57:08AM -0700, Jason Ekstrand wrote:
> > On Wed, May 31, 2017 at 9:10 AM, Jason Ekstrand <jason at jlekstrand.net>
> > wrote:
> >
> > > On Wed, May 31, 2017 at 2:15 AM, Pohjolainen, Topi <
> > > topi.pohjolainen at gmail.com> wrote:
> > >
> > >> On Fri, May 26, 2017 at 04:30:19PM -0700, Jason Ekstrand wrote:
> > >> > This commit adds a new unified interface for doing resolves. The
> basic
> > >> > format is that, prior to any surface access such as texturing or
> > >> > rendering, you call intel_miptree_prepare_access. If the surface
> was
> > >> > written, you call intel_miptree_finish_write. These two functions
> take
> > >> > parameters which tell them whether or not auxiliary compression and
> fast
> > >> > clears are supported on the surface. Later commits will add
> wrappers
> > >> > around these two functions for texturing, rendering, etc.
> > >> > ---
> > >> > src/mesa/drivers/dri/i965/intel_mipmap_tree.c | 156
> > >> +++++++++++++++++++++++++-
> > >> > src/mesa/drivers/dri/i965/intel_mipmap_tree.h | 80 +++++++++++++
> > >> > 2 files changed, 232 insertions(+), 4 deletions(-)
> > >> >
> > >> > diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> > >> b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> > >> > index 6cd32ce..0659e75 100644
> > >> > --- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> > >> > +++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
> > >> > @@ -2028,8 +2028,7 @@ bool
> > >> > intel_miptree_all_slices_resolve_hiz(struct brw_context *brw,
> > >> > struct intel_mipmap_tree *mt)
> > >> > {
> > >> > - return intel_miptree_depth_hiz_resolve(brw, mt,
> > >> > - 0, UINT32_MAX, 0,
> UINT32_MAX,
> > >> > + return intel_miptree_depth_hiz_resolve(brw, mt, 0, UINT32_MAX,
> 0,
> > >> UINT32_MAX,
> > >> >
> BLORP_HIZ_OP_HIZ_RESOLVE);
> > >> > }
> > >> >
> > >> > @@ -2037,8 +2036,7 @@ bool
> > >> > intel_miptree_all_slices_resolve_depth(struct brw_context *brw,
> > >> > struct intel_mipmap_tree *mt)
> > >> > {
> > >> > - return intel_miptree_depth_hiz_resolve(brw, mt,
> > >> > - 0, UINT32_MAX, 0,
> UINT32_MAX,
> > >> > + return intel_miptree_depth_hiz_resolve(brw, mt, 0, UINT32_MAX,
> 0,
> > >> UINT32_MAX,
> > >> >
> BLORP_HIZ_OP_DEPTH_RESOLVE);
> > >> > }
> > >> >
> > >> > @@ -2221,6 +2219,156 @@ intel_miptree_all_slices_
> resolve_color(struct
> > >> brw_context *brw,
> > >> > intel_miptree_resolve_color(brw, mt, 0, UINT32_MAX, 0,
> UINT32_MAX,
> > >> flags);
> > >> > }
> > >> >
> > >> > +void
> > >> > +intel_miptree_prepare_access(struct brw_context *brw,
> > >> > + struct intel_mipmap_tree *mt,
> > >> > + uint32_t start_level, uint32_t
> num_levels,
> > >> > + uint32_t start_layer, uint32_t
> num_layers,
> > >> > + bool aux_supported, bool
> > >> fast_clear_supported)
> > >>
> > >> Well, I might as well throw in my preference on using enumarated flags
> > >> instead
> > >> of booleans. In call sites, for exmaple,
> > >>
> > >> intel_miptree_prepare_access(brw, mt, start_level, num_levels,
> > >> start_layer, num_layers,
> > >> INTEL_SUPPORT_AUX |
> > >> INTEL_SUPPORT_FAST_CLEAR);
> > >>
> > >> is more informative than
> > >>
> > >> intel_miptree_prepare_access(brw, mt, start_level, num_levels,
> > >> start_layer, num_layers,
> > >> true, true);
> > >>
> > >
> > > Yeah, it is. I'll give it a go and see what it looks like.
> > >
> > >
> > >> Former also allows adding more flags without changing the signature.
> > >>
> > >
> > > I'm not sure if that's actually a feature... People tend to expand
> flags
> > > fields without thinking about what they're doing. :-) But I agree that
> > > labels are nice.
> > >
> >
> > I gave this a go. Take a look at the top patch on
> >
> > https://cgit.freedesktop.org/~jekstrand/mesa/log/?h=wip/
> > i965-resolve-rework-v3
> >
> > I'm not sure I actually like the result. Here's some thoughts:
> >
> > 1) It is somewhat more explicit what you support from the call.
> >
> > 2) If you don't support aux at all, then it becomes 0 which is less
> clear
> > than false, false.
> >
> > 3) Very few things call prepare_access directly.
> >
> > 4) Things are fairly firmly structured on the two bits right now. If
> > someone adds a third flag without thinking carefully about it and
> plumbing
> > it through to everything, they will break things. Having them be
> separate
> > parameters forces you to think about it at every stage.
> >
> > 5) I was renaming parameters in the special-case prepare_access
> functions
> > so, for instance, the HiZ version had hiz_supported and
> > fast_clear_supported. We can't do this anymore.
> >
> > 6) It's actually a bit more awkward to construct a set of flags than to
> > construct a pair of booleans. Not bad, but mildly annoying.
>
> Agreed. Lets drop that idea. The more I read, the more I saw cases where
> you
> didn't just pass true or false but nicely named helper variables. All those
> cases would just get unnecessarily complicated with the flags.
>
Done. :)
> >
> > 7) It's unclear what to do with finish_write since it only takes one
> > boolean.
> >
> > All in all, I'm not incredibly pleased with the change. While I agree in
> > general that flags are better than a pile of bools, I think the bools
> make
> > more sense here given how many layers of plumbing there are. I'm willing
> > to change it if you really want but it doesn't seem all that compelling.
>
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