[Mesa-dev] [PATCH 120/133] i965/fs_nir: Add support for indirect texture arrays

[Connor Abbott]

Again, not my area of expertise here.

On Tue, Dec 16, 2014 at 1:13 AM, Jason Ekstrand <jason at jlekstrand.net> wrote:
> ---
>  src/mesa/drivers/dri/i965/brw_fs_nir.cpp | 24 ++++++++++++++++++++++--
>  1 file changed, 22 insertions(+), 2 deletions(-)
>
> diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
> index c7610d1..f10a90d 100644
> --- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
> +++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
> @@ -1575,6 +1575,26 @@ fs_visitor::nir_emit_texture(nir_tex_instr *instr)
>     brw_wm_prog_key *key = (brw_wm_prog_key*) this->key;
>     unsigned sampler = instr->sampler_index;
>
> +   fs_reg sampler_reg;
> +   if (instr->has_sampler_indirect) {
> +      /* Figure out the highest possible sampler index and mark it as used */
> +      uint32_t max_used = sampler + instr->sampler_indirect_max;
> +      if (instr->op == nir_texop_tg4 && brw->gen < 8) {
> +         max_used += stage_prog_data->binding_table.gather_texture_start;
> +      } else {
> +         max_used += stage_prog_data->binding_table.texture_start;
> +      }
> +      brw_mark_surface_used(prog_data, max_used);
> +
> +      /* Emit code to evaluate the actual indexing expression */
> +      sampler_reg = fs_reg(this, glsl_type::uint_type);
> +      emit(ADD(sampler_reg, get_nir_src(instr->sampler_indirect),
> +               fs_reg(sampler)))
> +          ->force_writemask_all = true;
> +   } else {
> +      sampler_reg = fs_reg(sampler);
> +   }
> +
>     /* FINISHME: We're failing to recompile our programs when the sampler is
>      * updated.  This only matters for the texture rectangle scale parameters
>      * (pre-gen6, or gen6+ with GL_CLAMP).
> @@ -1653,7 +1673,7 @@ fs_visitor::nir_emit_texture(nir_tex_instr *instr)
>
>     if (instr->op == nir_texop_txf_ms) {
>        if (brw->gen >= 7 && key->tex.compressed_multisample_layout_mask & (1<<sampler))
> -         mcs = emit_mcs_fetch(coordinate, instr->coord_components, fs_reg(sampler));
> +         mcs = emit_mcs_fetch(coordinate, instr->coord_components, sampler_reg);
>        else
>           mcs = fs_reg(0u);
>     }
> @@ -1704,7 +1724,7 @@ fs_visitor::nir_emit_texture(nir_tex_instr *instr)
>     emit_texture(op, dest_type, coordinate, instr->coord_components,
>                  shadow_comparitor, lod, lod2, lod_components, sample_index,
>                  offset, offset_components, mcs, gather_component,
> -                is_cube_array, is_rect, sampler, fs_reg(sampler), texunit);
> +                is_cube_array, is_rect, sampler, sampler_reg, texunit);
>
>     fs_reg dest = get_nir_dest(instr->dest);
>     dest.type = this->result.type;
> --
> 2.2.0
>
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