[Mesa-dev] [PATCH] nir: Update shader info when adding discards

[Jason Ekstrand]

If you wanted to be extra spiffy, you could add a discard helper to
nir_builder and make it do it automatically :)

In any case,

Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>

On Fri, Aug 26, 2016 at 6:13 PM, Eric Anholt <eric at anholt.net> wrote:

> vc4 is about to start using the shader info field to set up discard
> handling.
> ---
>  src/compiler/nir/nir_lower_bitmap.c | 2 ++
>  src/compiler/nir/nir_lower_clip.c   | 2 ++
>  2 files changed, 4 insertions(+)
>
> diff --git a/src/compiler/nir/nir_lower_bitmap.c
> b/src/compiler/nir/nir_lower_bitmap.c
> index bd5c30f8dc19..216bedf57403 100644
> --- a/src/compiler/nir/nir_lower_bitmap.c
> +++ b/src/compiler/nir/nir_lower_bitmap.c
> @@ -107,6 +107,8 @@ lower_bitmap(nir_shader *shader, nir_builder *b,
>     discard = nir_intrinsic_instr_create(shader,
> nir_intrinsic_discard_if);
>     discard->src[0] = nir_src_for_ssa(cond);
>     nir_builder_instr_insert(b, &discard->instr);
> +
> +   shader->info.fs.uses_discard = true;
>  }
>
>  static void
> diff --git a/src/compiler/nir/nir_lower_clip.c
> b/src/compiler/nir/nir_lower_clip.c
> index 80db653a4286..b74e6cca39f4 100644
> --- a/src/compiler/nir/nir_lower_clip.c
> +++ b/src/compiler/nir/nir_lower_clip.c
> @@ -286,6 +286,8 @@ lower_clip_fs(nir_function_impl *impl, unsigned
> ucp_enables,
>                                                nir_intrinsic_discard_if);
>           discard->src[0] = nir_src_for_ssa(cond);
>           nir_builder_instr_insert(&b, &discard->instr);
> +
> +         b.shader->info.fs.uses_discard = true;
>        }
>     }
>  }
> --
> 2.9.3
>
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