emerald 0.3.214

A lite, fully featured 2D game engine.
Documentation 
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
130
131
132
133
134
135
136

use crate::{audio::sound::SoundInstanceId, AssetEngine, EmeraldError, SoundKey};

#[cfg(feature = "audio")]
mod kira_backend;

#[cfg(feature = "audio")]
use kira::manager::AudioManager;
#[cfg(feature = "audio")]
use kira_backend::KiraMixer as BackendMixer;

#[cfg(not(feature = "audio"))]
mod dummy;
#[cfg(not(feature = "audio"))]
use dummy::DummyMixer as BackendMixer;

#[cfg(target_arch = "wasm32")]
pub(crate) type ThreadSafeMixer = Box<dyn Mixer>;

#[cfg(not(target_arch = "wasm32"))]
pub(crate) type ThreadSafeMixer = Box<dyn Mixer + Send + Sync>;

pub(crate) trait Mixer {
    fn play(
        &mut self,
        sound: &SoundKey,
        asset_store: &mut AssetEngine,
    ) -> Result<SoundInstanceId, EmeraldError>;
    fn play_and_loop(
        &mut self,
        sound: &SoundKey,
        asset_store: &mut AssetEngine,
    ) -> Result<SoundInstanceId, EmeraldError>;
    fn get_volume(&self) -> Result<f32, EmeraldError>;
    fn set_volume(&mut self, volume: f32) -> Result<(), EmeraldError>;
    fn set_instance_volume(
        &mut self,
        snd_instance_id: SoundInstanceId,
        volume: f32,
    ) -> Result<(), EmeraldError>;
    fn get_instances(&self) -> Result<Vec<SoundInstanceId>, EmeraldError>;
    fn stop(&mut self, snd_instance_id: SoundInstanceId) -> Result<(), EmeraldError>;
    fn pause(&mut self, snd_instance_id: SoundInstanceId) -> Result<(), EmeraldError>;
    fn resume(&mut self, snd_instance_id: SoundInstanceId) -> Result<(), EmeraldError>;
    fn clear(&mut self) -> Result<(), EmeraldError>;
    fn post_update(&mut self) -> Result<(), EmeraldError>;
}

#[cfg(not(feature = "audio"))]
pub(crate) fn new_mixer() -> Result<ThreadSafeMixer, EmeraldError> {
    let mixer = BackendMixer::new()?;

    Ok(mixer)
}

#[cfg(feature = "audio")]
use std::sync::{Arc, Mutex};

#[cfg(feature = "audio")]
static mut KIRA_AUDIO_MANAGER: Option<Arc<Mutex<AudioManager>>> = None;

#[cfg(feature = "audio")]
pub(crate) fn new_mixer() -> Result<ThreadSafeMixer, EmeraldError> {
    use kira::manager::AudioManagerSettings;

    unsafe {
        if KIRA_AUDIO_MANAGER.is_none() {
            let audio_manager = AudioManager::new(AudioManagerSettings {
                num_sounds: 1000,
                num_instances: 1000,
                ..Default::default()
            })?;
            KIRA_AUDIO_MANAGER = Some(Arc::new(Mutex::new(audio_manager)));
        }

        if let Some(audio_manager) = &mut KIRA_AUDIO_MANAGER {
            let mixer = BackendMixer::new(audio_manager.clone())?;

            return Ok(mixer);
        }
    }

    Err(EmeraldError::new(
        "Unable to find or creat the kira audio manager",
    ))
}

pub struct MixerHandler<'a> {
    inner: &'a mut ThreadSafeMixer,
    asset_store: &'a mut AssetEngine,
}
impl<'a> MixerHandler<'a> {
    pub(crate) fn new(inner: &'a mut ThreadSafeMixer, asset_store: &'a mut AssetEngine) -> Self {
        MixerHandler { inner, asset_store }
    }

    pub fn play(&mut self, key: &SoundKey) -> Result<SoundInstanceId, EmeraldError> {
        self.inner.play(key, &mut self.asset_store)
    }
    pub fn play_and_loop(&mut self, key: &SoundKey) -> Result<SoundInstanceId, EmeraldError> {
        self.inner.play_and_loop(key, &mut self.asset_store)
    }
    pub fn get_volume(&self) -> Result<f32, EmeraldError> {
        self.inner.get_volume()
    }
    pub fn set_instance_volume(
        &mut self,
        snd_instance_id: SoundInstanceId,
        volume: f32,
    ) -> Result<(), EmeraldError> {
        self.inner.set_instance_volume(snd_instance_id, volume)
    }
    pub fn set_volume(&mut self, volume: f32) -> Result<(), EmeraldError> {
        self.inner.set_volume(volume)
    }
    pub fn get_instances(&self) -> Result<Vec<SoundInstanceId>, EmeraldError> {
        self.inner.get_instances()
    }
    pub fn stop(&mut self, snd_instance_id: SoundInstanceId) -> Result<(), EmeraldError> {
        self.inner.stop(snd_instance_id)
    }
    pub fn pause(&mut self, snd_instance_id: SoundInstanceId) -> Result<(), EmeraldError> {
        self.inner.pause(snd_instance_id)
    }
    pub fn resume(&mut self, snd_instance_id: SoundInstanceId) -> Result<(), EmeraldError> {
        self.inner.resume(snd_instance_id)
    }
    pub fn clear(&mut self) -> Result<(), EmeraldError> {
        self.inner.clear()
    }
    pub fn clear_sounds(&mut self) -> Result<(), EmeraldError> {
        for instance_id in self.get_instances()? {
            self.stop(instance_id)?;
        }
        Ok(())
    }
}