oxihuman_morph/
ear_fold_control.rs

1// Copyright (C) 2026 COOLJAPAN OU (Team KitaSan)
2// SPDX-License-Identifier: Apache-2.0
3#![allow(dead_code)]
4
5//! Ear fold control — the antihelical fold prominence and definition.
6
7/// Which ear.
8#[allow(dead_code)]
9#[derive(Debug, Clone, Copy, PartialEq, Eq)]
10pub enum EarFoldSide {
11    Left,
12    Right,
13}
14
15/// Configuration.
16#[allow(dead_code)]
17#[derive(Debug, Clone)]
18pub struct EarFoldConfig {
19    pub max_fold: f32,
20}
21
22impl Default for EarFoldConfig {
23    fn default() -> Self {
24        EarFoldConfig { max_fold: 1.0 }
25    }
26}
27
28/// Runtime state.
29#[allow(dead_code)]
30#[derive(Debug, Clone)]
31pub struct EarFoldState {
32    left_fold: f32,
33    right_fold: f32,
34    /// Definition sharpness in `[0.0, 1.0]`.
35    definition: f32,
36    config: EarFoldConfig,
37}
38
39/// Default config.
40pub fn default_ear_fold_config() -> EarFoldConfig {
41    EarFoldConfig::default()
42}
43
44/// New neutral state.
45pub fn new_ear_fold_state(config: EarFoldConfig) -> EarFoldState {
46    EarFoldState {
47        left_fold: 0.0,
48        right_fold: 0.0,
49        definition: 0.5,
50        config,
51    }
52}
53
54/// Set fold on one side.
55pub fn ef2_set_fold(state: &mut EarFoldState, side: EarFoldSide, v: f32) {
56    let v = v.clamp(0.0, 1.0);
57    match side {
58        EarFoldSide::Left => state.left_fold = v,
59        EarFoldSide::Right => state.right_fold = v,
60    }
61}
62
63/// Set fold on both sides.
64pub fn ef2_set_both(state: &mut EarFoldState, v: f32) {
65    let v = v.clamp(0.0, 1.0);
66    state.left_fold = v;
67    state.right_fold = v;
68}
69
70/// Set definition sharpness.
71pub fn ef2_set_definition(state: &mut EarFoldState, v: f32) {
72    state.definition = v.clamp(0.0, 1.0);
73}
74
75/// Reset.
76pub fn ef2_reset(state: &mut EarFoldState) {
77    state.left_fold = 0.0;
78    state.right_fold = 0.0;
79    state.definition = 0.5;
80}
81
82/// True if fold values are effectively zero.
83pub fn ef2_is_neutral(state: &EarFoldState) -> bool {
84    state.left_fold < 1e-5 && state.right_fold < 1e-5
85}
86
87/// Symmetry: 1.0 = perfect symmetry, 0.0 = maximally asymmetric.
88pub fn ef2_symmetry(state: &EarFoldState) -> f32 {
89    1.0 - (state.left_fold - state.right_fold).abs()
90}
91
92/// Average fold depth.
93pub fn ef2_average_fold(state: &EarFoldState) -> f32 {
94    (state.left_fold + state.right_fold) * 0.5
95}
96
97/// Morph weights: `[left_fold, right_fold, definition]`.
98pub fn ef2_to_weights(state: &EarFoldState) -> [f32; 3] {
99    let s = state.config.max_fold;
100    [
101        (state.left_fold * s).clamp(0.0, 1.0),
102        (state.right_fold * s).clamp(0.0, 1.0),
103        state.definition,
104    ]
105}
106
107/// Blend.
108pub fn ef2_blend(a: &EarFoldState, b: &EarFoldState, t: f32) -> EarFoldState {
109    let t = t.clamp(0.0, 1.0);
110    EarFoldState {
111        left_fold: a.left_fold + (b.left_fold - a.left_fold) * t,
112        right_fold: a.right_fold + (b.right_fold - a.right_fold) * t,
113        definition: a.definition + (b.definition - a.definition) * t,
114        config: a.config.clone(),
115    }
116}
117
118/// Serialise.
119pub fn ef2_to_json(state: &EarFoldState) -> String {
120    format!(
121        r#"{{"left_fold":{:.4},"right_fold":{:.4},"definition":{:.4}}}"#,
122        state.left_fold, state.right_fold, state.definition
123    )
124}
125
126// ---------------------------------------------------------------------------
127// Tests
128// ---------------------------------------------------------------------------
129#[cfg(test)]
130mod tests {
131    use super::*;
132
133    fn make() -> EarFoldState {
134        new_ear_fold_state(default_ear_fold_config())
135    }
136
137    #[test]
138    fn neutral_on_creation() {
139        assert!(ef2_is_neutral(&make()));
140    }
141
142    #[test]
143    fn set_one_side() {
144        let mut s = make();
145        ef2_set_fold(&mut s, EarFoldSide::Left, 0.6);
146        assert!((s.left_fold - 0.6).abs() < 1e-5);
147    }
148
149    #[test]
150    fn set_both_equal() {
151        let mut s = make();
152        ef2_set_both(&mut s, 0.4);
153        assert!((s.left_fold - s.right_fold).abs() < 1e-5);
154    }
155
156    #[test]
157    fn symmetry_when_equal() {
158        let mut s = make();
159        ef2_set_both(&mut s, 0.5);
160        assert!((ef2_symmetry(&s) - 1.0).abs() < 1e-5);
161    }
162
163    #[test]
164    fn reset_zeros_folds() {
165        let mut s = make();
166        ef2_set_both(&mut s, 0.9);
167        ef2_reset(&mut s);
168        assert!(ef2_is_neutral(&s));
169    }
170
171    #[test]
172    fn blend_midpoint() {
173        let mut b = make();
174        ef2_set_both(&mut b, 1.0);
175        let m = ef2_blend(&make(), &b, 0.5);
176        assert!((m.left_fold - 0.5).abs() < 1e-5);
177    }
178
179    #[test]
180    fn weights_in_range() {
181        let mut s = make();
182        ef2_set_both(&mut s, 0.7);
183        for v in ef2_to_weights(&s) {
184            assert!((0.0..=1.0).contains(&v));
185        }
186    }
187
188    #[test]
189    fn json_has_left_fold() {
190        assert!(ef2_to_json(&make()).contains("left_fold"));
191    }
192
193    #[test]
194    fn clamp_high() {
195        let mut s = make();
196        ef2_set_fold(&mut s, EarFoldSide::Right, 10.0);
197        assert!((s.right_fold - 1.0).abs() < 1e-5);
198    }
199}
oxihuman_morph/ear_fold_control.rs

oxihuman_morph/
ear_fold_control.rs
