Re: [PATCH v3 0/3] MR364: vkd3d-shader/hlsl: Implement inverse trigonometry.

[Giovanni Mascellani (＠giomasce)]

Giovanni Mascellani (@giomasce) commented about libs/vkd3d-shader/hlsl.y:
> -
>        "    %s abs_arg = abs(x);\n"
> -
>        "    %s correction = sqrt(1.0 - abs_arg);\n"
> -
>        "    %s result = correction * (((-0.019963376f\n"
> -
>        "        * abs_arg + 0.07612093f)\n"
> -
>        "        * abs_arg - 0.21274031f)\n"
> -
>        "        * abs_arg + 1.5707964f\n);"
> -
>        /* Piecewise, (x >= 0) ? result : pi - result. */
> -
>        "    %s mask = x >= 0.0;\n"
> -
>        "    result = mask * result\n"
> -
>        "        + (1.0 - mask) * (3.14159265 - result);\n"
> -
>        "    return %s;"
> -
>        "}";
> - static const char fn_name_acos[] = "acos";
> - static const char fn_name_asin[] = "asin";
> - static const char return_stmt_acos[] = "result";
> - static const char return_stmt_asin[] = "-result + (3.14159265 / 2.0)";

In the same spirit, just use `1.570796f`.