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

[Evan Tang (＠etang-cw)]

On Mon Sep 25 16:45:04 2023 +0000, Evan Tang wrote:
> You don't have to change the coefficients, just accumulate in the
> opposite order like `((coeff_x3 * x + coeff_x2) * x + coeff_x1) * x + coeff_x0`
> All modern GPUs have multiply-add instructions, so that will compile to
> three madds, which should be nice and fast.

And while the atan function is slightly less accurate to avoid the discontinuity, acos is slightly more accurate on average: https://www.desmos.com/calculator/3ncrqzazxa