[Mesa-dev] [PATCH v2 0/9] anv, nir: Move large constants to a UBO

Jason Ekstrand jason at jlekstrand.net
Mon Jul 2 19:09:31 UTC 2018

On Mon, Jul 2, 2018 at 11:26 AM, Kenneth Graunke <kenneth at whitecape.org>

> On Friday, June 29, 2018 5:13:48 PM PDT Jason Ekstrand wrote:
> > This little series adds an optimization pass to NIR and wires up up in
> anv
> > that moves large constant variables to a UBO.  This fixes a farily common
> > case in some filter or ambient occlusion shaders where they put some sort
> > of look-up table in the shader itself.  This series takes Skyrim Special
> > Edition running under DXVK from a slide show to a smooth and very
> playable
> > framerate on my SKL desktop.
> >
> > The first part of the series adds a concept of constant data that can be
> > associated with a NIR shader and adds an optimization pass to move large
> > constant variables into this constant data section.  It's left up to the
> > driver to figure out how to get this constant data into the shader.  The
> > last three patches wire things up in ANV to put this data into an
> implicit
> > UBO and enables the optimization.
> >
> > v2 (Jason Ekstrand):
> >  - Take anholt's feedback and make it more clear that the units on the
> >    number of constants is in bytes by calling it constant_data_size.
> >  - Break some of the deref to offset code out into helpers
> >  - Add new size/align helpers for types to ensure that we get alignments
> >    right when setting up constants.  This hasn't usually been a problem
> in
> >    the past because we align most things to a dword and 64-bit values
> >    aren't common.  We should start being more careful.
> >
> > Jason Ekstrand (9):
> >   util/macros: Import ALIGN_POT from ralloc.c
> >   nir: Add a deref_instr_has_indirect helper
> >   nir/types: Add a natural size and alignment helper
> >   nir/deref: Add helpers for getting offsets
> >   nir: Add a concept of constant data associated with a shader
> >   nir: Add a large constants optimization pass
> >   anv: Add support for shader constant data to the pipeline cache
> >   anv: Add state setup support for shader constants
> >   anv,intel: Enable nir_opt_large_constants for Vulkan
> I had some minor commentary, but even without any changes, series is:
> Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

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