nano9 0.1.0-alpha.3

A Pico-8 compatibility layer for Bevy
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
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171

use crate::pico8::{self, image::pixel_art_settings, *};
use bevy::asset::{io::Reader, AssetLoader, LoadContext};

use super::*;
#[cfg(feature = "scripting")]
use bevy_mod_scripting::core::asset::{Language, ScriptAsset};

pub(crate) fn plugin(app: &mut App) {
    app
        .init_asset_loader::<P8AssetLoader>()
        .init_asset_loader::<PngAssetLoader>();

    // #[cfg(feature = "scripting")]
    // app
    //     .init_asset_loader::<P8LuaAssetLoader>()
    //     ;
}

#[derive(Default)]
struct P8AssetLoader;

impl AssetLoader for P8AssetLoader {
    type Asset = Pico8Asset;
    type Settings = CartLoaderSettings;
    type Error = CartLoaderError;
    async fn load(
        &self,
        reader: &mut dyn Reader,
        settings: &CartLoaderSettings,
        load_context: &mut LoadContext<'_>,
    ) -> Result<Self::Asset, Self::Error> {
        let mut bytes = Vec::new();
        reader.read_to_end(&mut bytes).await?;
        let content = String::from_utf8(bytes)?;
        let mut cart = Cart::from_str(&content, settings)?;
        #[cfg(feature = "pico8-to-lua")]
        if let Some(patched_code) = translate_pico8_to_lua(&cart.lua, load_context).await? {
            cart.lua = patched_code;
        }
        // Ok(cart)
        // let cart = P8CartLoader.load(reader, settings, load_context).await?;
        log_lua_code(&cart.lua);
        to_asset(cart, load_context)
    }

    fn extensions(&self) -> &[&str] {
        &["p8"]
    }
}


// #[cfg(feature = "scripting")]
// #[derive(Default)]
// struct P8LuaAssetLoader;

// #[cfg(feature = "scripting")]
// impl AssetLoader for P8LuaAssetLoader {
//     type Asset = ScriptAsset;
//     type Settings = CartLoaderSettings;
//     type Error = CartLoaderError;
//     async fn load(
//         &self,
//         reader: &mut dyn Reader,
//         settings: &CartLoaderSettings,
//         load_context: &mut LoadContext<'_>,
//     ) -> Result<Self::Asset, Self::Error> {
//         let cart = P8CartLoader.load(reader, settings, load_context).await?;
//         let code_path: PathBuf = load_context.path().into();
//         let code = cart.lua;
//         Ok(ScriptAsset {
//             content: code.into_bytes().into_boxed_slice(),
//             language: Language::Lua,
//         })
//     }

//     fn extensions(&self) -> &[&str] {
//         &["p8"]
//     }
// }
#[derive(Default)]
struct PngAssetLoader;

impl AssetLoader for PngAssetLoader {
    type Asset = Pico8Asset;
    type Settings = CartLoaderSettings;
    type Error = CartLoaderError;
    async fn load(
        &self,
        reader: &mut dyn Reader,
        settings: &CartLoaderSettings,
        load_context: &mut LoadContext<'_>,
    ) -> Result<Self::Asset, Self::Error> {
        let cart = PngCartLoader.load(reader, settings, load_context).await?;
        to_asset(cart, load_context)
    }

    fn extensions(&self) -> &[&str] {
        &["png"]
    }
}

fn to_asset(cart: Cart, load_context: &mut LoadContext) -> Result<Pico8Asset, CartLoaderError> {
    let layout = load_context.add_labeled_asset("atlas".into(),
        TextureAtlasLayout::from_grid(
            PICO8_SPRITE_SIZE,
            PICO8_TILE_COUNT.x,
            PICO8_TILE_COUNT.y,
            None,
            None,
        ));
    let sprite_sheets: Vec<_> = cart
        .gfx
        .map(|gfx| load_context.add_labeled_asset("gfx".into(), gfx))
        .map(|gfx_handle| load_context.add_labeled_asset("sprite_sheet".into(), SpriteSheet {
            handle: SprHandle::Gfx(gfx_handle),
            palette: None,
            sprite_size: UVec2::splat(8),
            flags: cart.flags,
            layout,
        }))
        .into_iter()
        .collect();
    let code = cart.lua;
    // let code_path: PathBuf = load_context.path().into();
    let asset = Pico8Asset {
        #[cfg(feature = "scripting")]
        scripts: if cfg!(feature = "scripting") {
            vec![
                load_context.add_labeled_asset("lua".into(), ScriptAsset {
                    content: code.into_bytes().into_boxed_slice(),
                    language: Language::Lua,
                    asset_path: default(),
                }),
            ]
        } else {
            vec![]
        },
        palettes: vec![Palette::from_slice(&PALETTE)],
        border: load_context
            .loader()
            .with_settings(pixel_art_settings)
            .load(pico8::PICO8_BORDER),
        maps: vec![
            load_context
                .add_labeled_asset("map".to_string(), P8Map {
                    entries: cart.map.clone(),
                })
                .into()],
        audio_banks: vec![{
            let bank = AudioBank(
            cart.sfx
                .into_iter()
                .enumerate()
                .map(|(n, sfx)| {
                    Audio::Sfx(
                        load_context
                            .add_labeled_asset(format!("sfx{n}"), sfx),
                    )
                })
                .collect(),
        );
            load_context.add_labeled_asset("audio_bank".into(), bank)
        }],
        sprite_sheets,
        font: vec![N9Font {
            handle: load_context.load(PICO8_FONT),
        }],
        meshes: vec![],
    };
    Ok(asset)
}