mittens-engine 0.7.0

A Vulkan and OpenXR scene engine with ECS, reactive signals, and Meow Meow scripting
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129

use std::collections::{BTreeMap, BTreeSet};

use crate::engine::ecs::component::{AnimationComponent, AnimationState, KeyframeComponent};
use crate::engine::ecs::{ComponentId, World};

#[derive(Debug, Clone, Copy)]
pub(crate) struct AnimationEvalConfig {
    /// How far ahead to evaluate audio keyframes, in seconds.
    pub(crate) audio_lookahead_sec: f64,
}

impl Default for AnimationEvalConfig {
    fn default() -> Self {
        Self {
            audio_lookahead_sec: 0.100,
        }
    }
}

#[derive(Debug, Default)]
pub(crate) struct AnimationScheduler {
    pub(crate) config: AnimationEvalConfig,
}

impl AnimationScheduler {
    pub(crate) fn new() -> Self {
        Self::default()
    }

    pub(crate) fn with_lookahead_sec(mut self, sec: f64) -> Self {
        if sec.is_finite() && sec >= 0.0 {
            self.config.audio_lookahead_sec = sec;
        }
        self
    }

    pub(crate) fn audio_lookahead_beats(&self, bpm: f64) -> f64 {
        if !bpm.is_finite() || bpm <= 0.0 {
            return 0.0;
        }
        let beats_per_sec = bpm / 60.0;
        (self.config.audio_lookahead_sec.max(0.0)) * beats_per_sec
    }

    pub(crate) fn visual_due_keyframes(
        &self,
        world: &World,
        keyframes: &[ComponentId],
        fired_keyframes: &BTreeSet<ComponentId>,
        min_beat: f64,
        local_beat: f64,
    ) -> Vec<ComponentId> {
        let mut out = Vec::new();
        for &kf_id in keyframes.iter() {
            if fired_keyframes.contains(&kf_id) {
                continue;
            }
            let Some(kf) = world.get_component_by_id_as::<KeyframeComponent>(kf_id) else {
                continue;
            };
            let kf_local_beat = kf.beat - min_beat;
            if kf_local_beat <= local_beat + 1e-9 {
                out.push(kf_id);
            }
        }
        out
    }

    pub(crate) fn audio_due_keyframes(
        &self,
        world: &World,
        anim_id: ComponentId,
        keyframes: &[ComponentId],
        scheduled_cycle_by_keyframe: &BTreeMap<ComponentId, u64>,
        current_cycle: u64,
        min_beat: f64,
        local_beat: f64,
        bpm: f64,
        loop_len: f64,
    ) -> Vec<(ComponentId, f64, u64)> {
        let Some(anim) = world.get_component_by_id_as::<AnimationComponent>(anim_id) else {
            return Vec::new();
        };
        if anim.state == AnimationState::Paused {
            return Vec::new();
        }

        let lookahead = self.audio_lookahead_beats(bpm);
        if lookahead <= 0.0 {
            return Vec::new();
        }
        let local_end = local_beat + lookahead;

        let is_looping = anim.state == AnimationState::Looping;
        let loop_len = if loop_len.is_finite() {
            loop_len.max(0.0)
        } else {
            0.0
        };

        let mut out = Vec::new();
        for &kf_id in keyframes.iter() {
            let scheduled_cycle = scheduled_cycle_by_keyframe.get(&kf_id).copied();

            let Some(kf) = world.get_component_by_id_as::<KeyframeComponent>(kf_id) else {
                continue;
            };
            let kf_local_beat = kf.beat - min_beat;

            if kf_local_beat >= local_beat - 1e-9 && kf_local_beat <= local_end + 1e-9 {
                if scheduled_cycle != Some(current_cycle) {
                    out.push((kf_id, kf_local_beat, current_cycle));
                }
                continue;
            }

            if is_looping && loop_len > 1e-9 && local_end > loop_len + 1e-9 {
                let next_end = local_end - loop_len;
                if kf_local_beat >= 0.0 - 1e-9 && kf_local_beat <= next_end + 1e-9 {
                    let next_cycle = current_cycle.saturating_add(1);
                    if scheduled_cycle != Some(next_cycle) {
                        out.push((kf_id, kf_local_beat, next_cycle));
                    }
                }
            }
        }
        out
    }
}