[Mesa-dev] [PATCH v3 4/5] i965: handle nir_intrinsic_image_size

[Pohjolainen, Topi]

On Thu, Aug 13, 2015 at 08:00:43PM +0300, Martin Peres wrote:
> v2, Review from Francisco Jerez:
> - avoid the camelCase for the booleans
> - init the booleans using the sampler type
> - force the initialization of all the components of the output register
> 
> Signed-off-by: Martin Peres <martin.peres at linux.intel.com>
> ---
>  src/mesa/drivers/dri/i965/brw_fs_nir.cpp | 48 ++++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
> 
> diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
> index ce4153d..cc0a5a6 100644
> --- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
> +++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
> @@ -1406,6 +1406,54 @@ fs_visitor::nir_emit_intrinsic(const fs_builder &bld, nir_intrinsic_instr *instr
>        break;
>     }
>  
> +   case nir_intrinsic_image_size: {
> +      /* Get the referenced image variable and type. */
> +      const nir_variable *var = instr->variables[0]->var;
> +      const glsl_type *type = var->type->without_array();
> +      const brw_reg_type base_type = get_image_base_type(type);
> +
> +      /* Get the size of the image. */
> +      const fs_reg image = get_nir_image_deref(instr->variables[0]);
> +      const fs_reg size = offset(image, bld, BRW_IMAGE_PARAM_SIZE_OFFSET);
> +
> +      /*
> +       * For 1DArray image types, the array index is stored in the Z component.

Just a few style nits from my part.

Usually (and in the rest of the file being modified) multi-line comments do
not have separate first line, instead:

         /* For 1DArray image types, the array index is stored in the Z
          * component.

> +       * Fix this by swizzling the Z component to the Y component.
> +       */
> +      const bool is_1d_array_image =
> +              (type->sampler_dimensionality == GLSL_SAMPLER_DIM_1D &&
> +               type->sampler_array);

Indentation here looks a little odd and you can drop the extra (). I would
write this:

         const bool is_1d_array_image =
            type->sampler_dimensionality == GLSL_SAMPLER_DIM_1D &&
            type->sampler_array;

Same comments just below.

> +
> +      /*
> +       * For CubeMapArray images, we should count the number of cubes instead
> +       * of the number of faces. Fix it by dividing the (Z component) by 6.
> +       */
> +      const bool is_cube_map_array_image =
> +              (type->sampler_dimensionality == GLSL_SAMPLER_DIM_CUBE &&
> +               type->sampler_array);
> +
> +      /* Copy all the components. */
> +      const nir_intrinsic_info *info = &nir_intrinsic_infos[instr->intrinsic];
> +      for (int c = 0; c < info->dest_components; ++c) {
> +         if (c > type->coordinate_components()) {
> +             bld.MOV(offset(retype(dest, base_type), bld, c),
> +                     fs_reg(1));
> +         } else if (c == 1 && is_1d_array_image) {
> +            bld.MOV(offset(retype(dest, base_type), bld, c),
> +                    offset(size, bld, 2));
> +         } else if (c == 2 && is_cube_map_array_image) {
> +            bld.emit(SHADER_OPCODE_INT_QUOTIENT,
> +                     offset(retype(dest, base_type), bld, c),
> +                     offset(size, bld, c), fs_reg(6));
> +         } else {
> +            bld.MOV(offset(retype(dest, base_type), bld, c),
> +                    offset(size, bld, c));
> +         }
> +       }
> +
> +      break;
> +   }
> +
>     case nir_intrinsic_load_front_face:
>        bld.MOV(retype(dest, BRW_REGISTER_TYPE_D),
>                *emit_frontfacing_interpolation());
> -- 
> 2.5.0
> 
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