[Mesa-dev] [PATCH 1/2] nir: Add a nir->info.uses_interp_var_at_offset flag.

[Jason Ekstrand]

On Fri, May 13, 2016 at 1:42 AM, Kenneth Graunke <kenneth at whitecape.org>
wrote:

> It would probably make more sense to set this from nir_gather_info()
> in case we manage to dead code eliminate these intrinsics.  However,
> we haven't transitioned the GL driver to using that pass yet...
>

Please add it anyway so nir_gather_info doesn't get out-of-date.


>
> Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
> ---
>  src/compiler/nir/glsl_to_nir.cpp | 3 +++
>  src/compiler/nir/nir.h           | 3 +++
>  2 files changed, 6 insertions(+)
>
> diff --git a/src/compiler/nir/glsl_to_nir.cpp
> b/src/compiler/nir/glsl_to_nir.cpp
> index fb1d421..e82d98a 100644
> --- a/src/compiler/nir/glsl_to_nir.cpp
> +++ b/src/compiler/nir/glsl_to_nir.cpp
> @@ -1276,6 +1276,9 @@ nir_visitor::visit(ir_expression *ir)
>            intrin->intrinsic == nir_intrinsic_interp_var_at_sample)
>           intrin->src[0] =
> nir_src_for_ssa(evaluate_rvalue(ir->operands[1]));
>
> +      if (intrin->intrinsic == nir_intrinsic_interp_var_at_offset)
> +         shader->info.uses_interp_var_at_offset = true;
> +
>        unsigned bit_size =  glsl_get_bit_size(deref->type);
>        add_instr(&intrin->instr, deref->type->vector_elements, bit_size);
>
> diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
> index 20927a2..d12792d 100644
> --- a/src/compiler/nir/nir.h
> +++ b/src/compiler/nir/nir.h
> @@ -1710,6 +1710,9 @@ typedef struct nir_shader_info {
>     /* Whether or not this shader ever uses textureGather() */
>     bool uses_texture_gather;
>
> +   /** Whether or not this shader uses nir_intrinsic_interp_var_at_offset
> */
> +   bool uses_interp_var_at_offset;
> +
>     /* Whether or not this shader uses the gl_ClipDistance output */
>     bool uses_clip_distance_out;
>
> --
> 2.8.2
>
>
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