[PATCH v3 3/3] wined3d: Do not zero 'w' with zero norm for 'nrm' opcode in GLSL backend.

[Henri Verbeet]

On Thu, 13 Jun 2019 at 14:48, Paul Gofman <gofmanp at gmail.com> wrote:
> @@ -4268,7 +4268,12 @@ static void shader_glsl_nrm(const struct wined3d_shader_instruction *ins)
>                  src_param.param_str, src_param.param_str);
>      shader_glsl_append_dst(buffer, ins);
>
> -    if (mask_size > 1)
> +    if (mask_size == 4)
> +    {
> +        shader_addline(buffer, "tmp0.x == 0.0 ? vec4(vec3(0.0), %s[3]) : (%s * inversesqrt(tmp0.x)));\n",
> +                src_param.param_str, src_param.param_str);
> +    }
> +    else if (mask_size > 1)
>      {
>          shader_addline(buffer, "tmp0.x == 0.0 ? vec%u(0.0) : (%s * inversesqrt(tmp0.x)));\n",
>                  mask_size, src_param.param_str);
> --
This should work, but the following is perhaps more straightforward:

    shader_addline(buffer, "tmp0.x == 0.0 ? %s : (%s *
inversesqrt(tmp0.x)));\n",
            src_param.param_str, src_param.param_str);

I.e., simply dropping the mask_size dependency.