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Replace the cubic_spline_interpolation
macro with a generic function (#11605)
# Objective - Address a `TODO` item in `bevy_animation`. ## Solution - Replace the `cubic_spline_interpolation` macro with a function. The function isn't marked as `#[inline(always)]` but from what I checked with `cargo asm` it gets inlined (even in debug, unless I explicitly add `#[inline(never)]`), so this should be identical to the macro. If needed I can add the attribute.
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1 changed files with 22 additions and 16 deletions
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@ -2,7 +2,7 @@
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#![warn(missing_docs)]
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use std::ops::Deref;
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use std::ops::{Add, Deref, Mul};
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use std::time::Duration;
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use bevy_app::{App, Plugin, PostUpdate};
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@ -672,16 +672,22 @@ fn get_keyframe(target_count: usize, keyframes: &[f32], key_index: usize) -> &[f
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&keyframes[start..end]
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}
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// Helper macro for cubic spline interpolation
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// it needs to work on `f32`, `Vec3` and `Quat`
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// TODO: replace by a function if the proper trait bounds can be figured out
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macro_rules! cubic_spline_interpolation {
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($value_start: expr, $tangent_out_start: expr, $tangent_in_end: expr, $value_end: expr, $lerp: expr, $step_duration: expr,) => {
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$value_start * (2.0 * $lerp.powi(3) - 3.0 * $lerp.powi(2) + 1.0)
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+ $tangent_out_start * ($step_duration) * ($lerp.powi(3) - 2.0 * $lerp.powi(2) + $lerp)
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+ $value_end * (-2.0 * $lerp.powi(3) + 3.0 * $lerp.powi(2))
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+ $tangent_in_end * ($step_duration) * ($lerp.powi(3) - $lerp.powi(2))
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};
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/// Helper function for cubic spline interpolation.
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fn cubic_spline_interpolation<T>(
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value_start: T,
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tangent_out_start: T,
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tangent_in_end: T,
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value_end: T,
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lerp: f32,
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step_duration: f32,
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) -> T
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where
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T: Mul<f32, Output = T> + Add<Output = T>,
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{
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value_start * (2.0 * lerp.powi(3) - 3.0 * lerp.powi(2) + 1.0)
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+ tangent_out_start * (step_duration) * (lerp.powi(3) - 2.0 * lerp.powi(2) + lerp)
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+ value_end * (-2.0 * lerp.powi(3) + 3.0 * lerp.powi(2))
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+ tangent_in_end * step_duration * (lerp.powi(3) - lerp.powi(2))
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}
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#[allow(clippy::too_many_arguments)]
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@ -828,7 +834,7 @@ fn apply_keyframe(
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let tangent_out_start = keyframes[step_start * 3 + 2];
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let tangent_in_end = keyframes[(step_start + 1) * 3];
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let value_end = keyframes[(step_start + 1) * 3 + 1];
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let result = cubic_spline_interpolation!(
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let result = cubic_spline_interpolation(
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value_start,
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tangent_out_start,
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tangent_in_end,
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@ -852,7 +858,7 @@ fn apply_keyframe(
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let tangent_out_start = keyframes[step_start * 3 + 2];
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let tangent_in_end = keyframes[(step_start + 1) * 3];
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let value_end = keyframes[(step_start + 1) * 3 + 1];
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let result = cubic_spline_interpolation!(
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let result = cubic_spline_interpolation(
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value_start,
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tangent_out_start,
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tangent_in_end,
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@ -876,7 +882,7 @@ fn apply_keyframe(
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let tangent_out_start = keyframes[step_start * 3 + 2];
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let tangent_in_end = keyframes[(step_start + 1) * 3];
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let value_end = keyframes[(step_start + 1) * 3 + 1];
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let result = cubic_spline_interpolation!(
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let result = cubic_spline_interpolation(
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value_start,
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tangent_out_start,
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tangent_in_end,
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@ -918,8 +924,8 @@ fn apply_keyframe(
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.zip(tangents_in_end)
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.zip(morph_end)
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.map(
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|(((value_start, tangent_out_start), tangent_in_end), value_end)| {
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cubic_spline_interpolation!(
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|(((&value_start, &tangent_out_start), &tangent_in_end), &value_end)| {
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cubic_spline_interpolation(
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value_start,
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tangent_out_start,
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tangent_in_end,
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