oxygengine_core/assets/protocols/
meta.rs

1use crate::assets::{
2    asset::{Asset, AssetId},
3    protocol::{AssetLoadResult, AssetProtocol, AssetVariant, Meta},
4};
5use serde::{Deserialize, Serialize};
6use std::{collections::HashMap, str::from_utf8};
7
8#[derive(Debug, Default, Clone, PartialEq, Serialize, Deserialize)]
9pub struct MetaAsset {
10    #[serde(default)]
11    target: Vec<String>,
12    #[serde(skip)]
13    ids: HashMap<String, AssetId>,
14}
15
16impl MetaAsset {
17    pub fn with_target(mut self, target: impl ToString) -> Self {
18        self.target.push(target.to_string());
19        self
20    }
21
22    pub fn target(&self) -> impl Iterator<Item = &str> {
23        self.target.iter().map(|path| path.as_str())
24    }
25
26    pub fn asset_ids(&self) -> impl Iterator<Item = (&str, AssetId)> {
27        self.ids.iter().map(|(key, id)| (key.as_str(), *id))
28    }
29
30    pub fn asset_id(&self, key: &str) -> Option<AssetId> {
31        self.ids.get(key).copied()
32    }
33}
34
35pub struct MetaAssetProtocol;
36
37impl AssetProtocol for MetaAssetProtocol {
38    fn name(&self) -> &str {
39        "meta"
40    }
41
42    fn on_load_with_path(&mut self, path: &str, data: Vec<u8>) -> AssetLoadResult {
43        let data = if path.ends_with(".asset") {
44            let data = from_utf8(&data).unwrap();
45            match serde_json::from_str::<MetaAsset>(data) {
46                Ok(value) => value,
47                Err(error) => {
48                    return AssetLoadResult::Error(format!(
49                        "Error loading Meta JSON asset: {:?}",
50                        error
51                    ));
52                }
53            }
54        } else {
55            match bincode::deserialize::<MetaAsset>(&data) {
56                Ok(value) => value,
57                Err(error) => {
58                    return AssetLoadResult::Error(format!(
59                        "Error loading Meta binary asset: {:?}",
60                        error
61                    ));
62                }
63            }
64        };
65        let list = data
66            .target
67            .iter()
68            .map(|path| (path.to_owned(), path.to_owned()))
69            .collect();
70        AssetLoadResult::Yield(None, list)
71    }
72
73    fn on_resume(&mut self, _: Meta, list: &[(&str, &Asset)]) -> AssetLoadResult {
74        let target = list
75            .iter()
76            .map(|(_, asset)| asset.to_full_path())
77            .collect::<Vec<_>>();
78        let ids = list
79            .iter()
80            .map(|(key, asset)| (key.to_string(), asset.id()))
81            .collect::<HashMap<_, _>>();
82        AssetLoadResult::Data(Box::new(MetaAsset { target, ids }))
83    }
84
85    fn on_unload(&mut self, asset: &Asset) -> Option<Vec<AssetVariant>> {
86        asset
87            .get::<MetaAsset>()
88            .map(|asset| asset.ids.values().map(|id| AssetVariant::Id(*id)).collect())
89    }
90
91    // on_load_with_path() handles loading so this is not needed, so we just make it unreachable.
92    fn on_load(&mut self, _data: Vec<u8>) -> AssetLoadResult {
93        unreachable!()
94    }
95}
oxygengine_core/assets/protocols/meta.rs

oxygengine_core/assets/protocols/
meta.rs
