On Mon, 2016-12-12 at 23:14 -0800, Kenneth Graunke wrote:
> On Monday, December 12, 2016 2:11:43 PM PST Iago Toral Quiroga wrote:
> >
> > This is ported from the Intel lowering pass that we use with GLSL
> > IR.
> > The NIR pass only handles cube maps, not shadow samplers, which are
> > also lowered for gen < 8 on Intel hardware. We will add support for
> > that in a later patch, at which point we should be able to remove
> > the GLSL IR lowering pass.
> >
> > v2:
> > - added a helper to retrieve ddx/ddy parameters (Ken)
> > - No need to make size.z=1.0, we are only using component x anyway
> > (Iago)
> > ---
> > src/compiler/nir/nir.h | 5 +
> > src/compiler/nir/nir_lower_tex.c | 265
> > +++++++++++++++++++++++++++++++++++++++
> > 2 files changed, 270 insertions(+)
> >
> > diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
> > index 544d4ba..600e3d6 100644
> > --- a/src/compiler/nir/nir.h
> > +++ b/src/compiler/nir/nir.h
> > @@ -2394,6 +2394,11 @@ typedef struct nir_lower_tex_options {
> > * of the texture are lowered to linear.
> > */
> > unsigned lower_srgb;
> > +
> > + /**
> > + * If true, lower nir_texop_txd on cube maps with
> > nir_texop_txl.
> > + */
> > + bool lower_txd_cube_map;
> > } nir_lower_tex_options;
> >
> > bool nir_lower_tex(nir_shader *shader,
> > diff --git a/src/compiler/nir/nir_lower_tex.c
> > b/src/compiler/nir/nir_lower_tex.c
> > index ccca59b..da024e2 100644
> > --- a/src/compiler/nir/nir_lower_tex.c
> > +++ b/src/compiler/nir/nir_lower_tex.c
> > @@ -305,6 +305,265 @@ lower_yx_xuxv_external(nir_builder *b,
> > nir_tex_instr *tex)
> > }
> >
> > static void
> > +get_ddx_ddy(nir_tex_instr *tex, nir_ssa_def **ddx, nir_ssa_def
> > **ddy)
> > +{
> > + for (int i = 0; i < tex->num_srcs; i++) {
> > + switch (tex->src[i].src_type) {
> > + case nir_tex_src_ddx:
> > + *ddx = tex->src[i].src.ssa;
> > + break;
> > + case nir_tex_src_ddy:
> > + *ddy = tex->src[i].src.ssa;
> > + break;
> > + default:
> > + break;
> > + }
> > + }
> > +}
> > +
> > +/*
> > + * Emits a textureLod operation used to replace an existing
> > + * textureGrad instruction.
> > + */
> > +static void
> > +replace_gradient_with_lod(nir_builder *b, nir_ssa_def *lod,
> > nir_tex_instr *tex)
> > +{
> > + /* Check whether we need projector, shadow comparitor or offset
> > */
> > + int comparitor_index = -1;
> > + int projector_index = -1;
> > + int offset_index = -1;
> > + int extra_srcs = 0;
> > + for (int i = 0; i < tex->num_srcs; i++) {
> > + switch (tex->src[i].src_type) {
> > + case nir_tex_src_projector:
> > + projector_index = i;
> > + extra_srcs++;
> > + break;
> > + case nir_tex_src_offset:
> > + offset_index = i;
> > + extra_srcs++;
> > + break;
> > + case nir_tex_src_comparitor:
> > + comparitor_index = i;
> > + extra_srcs++;
> > + break;
> > + default:
> > + break;
> > + }
> > + }
> This looks correct now, but I liked Eric's suggestion from last time
> -
> you can actually just do:
>
> int comparitor_idx = nir_tex_instr_src_index(tex,
> nir_tex_src_comparitor);
> int projector_idx = nir_tex_instr_src_index(tex,
> nir_tex_src_projector);
> int offset_idx = nir_tex_instr_src_index(tex, nir_tex_src_offset);
>
> /* we replace ddx and ddy with a single value: lod */
> int num_srcs = tex->num_srcs - 1;
>
> nir_ssa_def *dPdx =
> tex->src[nir_tex_src_index(tex, nir_tex_src_ddx)].src.ssa;
> nir_ssa_def *dPdy =
> tex->src[nir_tex_src_index(tex, nir_tex_src_ddy)].src.ssa;
>
> Either way, this series is:
> Reviewed-by: Kenneth Graunke <kenn...@whitecape.org>
Ah, I had missed that suggestion, that's much better. I'll fix it up
and push the series. Thanks for the review!
Iago
> I don't need to see a third posting - feel free to fix up any last
> things before pushing. Thanks for doing this!
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