Basic model loading works!

Going to look into camera and light entity loading next

assets/README.md

@@ -0,0 +1,17 @@
+# Assets
+
+## Custom Assets
+
+### `.entity` files
+
+Files ending in `.entity` store entity information.
+
+Note: This data is not auto-magically de/serialized by Bevy, we write our own parser using `nom`.
+This custom reading/writing can be found in `src/save.rs`.
+
+All `.entity` files list one component per line.
+Components include:
+* `name <string>`
+* `uuid <UUID string>`
+* `transform translation <f32> <f32> <f32> rotation <f32> <f32> <f32> <f32> scale <f32> <f32> <f32>`
+* `model "<path string>" "<string>"`

assets/levels/00/entities/van.entity

@@ -1,3 +1,4 @@
 name van
 uuid 5c270e84-814c-4d51-9ccd-ab79d9e01f1d
-transform translation 1.0 1.0 1.0 rotation 0.0 0.0 0.0 1.0 scale 0.5 0.5 0.5
+transform translation 0.0 0.0 0.0 rotation 0.0 0.0 0.0 1.0 scale 1.0 1.0 1.0
+model "models/van.glb" "Scene"

src/prelude.rs

@@ -11,6 +11,7 @@ pub(crate) use bevy::window::WindowCloseRequested;
 pub(crate) use bevy::window::WindowRef;
 pub(crate) use nom::bytes::complete::tag;
 pub(crate) use nom::bytes::complete::take;
+pub(crate) use nom::bytes::complete::take_until1;
 pub(crate) use nom::number::complete::float;
 pub(crate) use nom::sequence::tuple;
 

src/save.rs

@@ -1,4 +1,4 @@
-use bevy::{math::Vec3A, render::primitives::Aabb};
+use bevy::{gltf::Gltf, math::Vec3A, render::primitives::Aabb};
 use nom::IResult;
 
 use crate::prelude::*;
@@ -11,7 +11,10 @@ impl Plugin for SavePlugin {
         app.init_asset::<SaveEntity>()
             .init_asset_loader::<SaveEntityLoader>()
             .add_systems(Startup, test_save_entity)
-			.add_systems(Update, check_loaded_entity_assets.run_if(on_event::<AssetEvent<SaveEntity>>()));
+            .add_systems(
+                Update,
+                check_loaded_entity_assets.run_if(on_event::<AssetEvent<SaveEntity>>()),
+            );
     }
 }
 
@@ -20,11 +23,15 @@ struct SaveEntity {
     transform: Option<Transform>,
     name: Option<Name>,
     uuid: Option<EntityUuid>,
+    model: Option<(Handle<Gltf>, String)>,
 }
 
 impl SaveEntity {
-    fn parse(s: &str) -> Result<SaveEntity, parse::SaveEntityParseError> {
+    fn parse(
-        let lines = s.split('\n');
+        text: &str,
+        load_context: &mut LoadContext,
+    ) -> Result<SaveEntity, parse::SaveEntityParseError> {
+        let lines = text.split('\n');
         let mut entity = SaveEntity { ..default() };
         lines.into_iter().for_each(|line| {
             if let Ok(name) = parse::parse_save_name(line) {
@@ -33,6 +40,9 @@ impl SaveEntity {
                 entity.transform = Some(transform);
             } else if let Ok(uuid) = parse::parse_save_uuid(line) {
                 entity.uuid = Some(EntityUuid(uuid));
+            } else if let Ok((gltf_path, scene_name)) = parse::parse_save_model(line) {
+                let handle = load_context.load(gltf_path);
+                entity.model = Some((handle, scene_name));
             }
         });
         Ok(entity)
@@ -87,6 +97,11 @@ mod parse {
         .map(|(s, (w, _, x, _, y, _, z))| (s, (w, x, y, z)))
     }
 
+    fn parse_string<'a>(i: &'a str) -> IResult<&'a str, &'a str> {
+        let (rem, (_, out, _)) = tuple((tag("\""), take_until1("\""), tag("\"")))(i)?;
+        Ok((rem, out))
+    }
+
     ///
     /// ```
     /// let parsed = parse_save_transform("transform translation 1.0 2.0 3.0 rotation 1.0 0.0 0.0 0.0 scale 1.0 1.0 1.0").unwrap();
@@ -119,9 +134,25 @@ mod parse {
             }
         }
 
+        // Assert there are no trailing characters on the line
+        debug_assert_eq!(curr, "");
+
         Ok(transform)
     }
 
+    #[test]
+    fn test_parse_transform() {
+        let line = "transform translation 1.0 2.0 3.0 rotation 0.1 0.2 0.3 1.0 scale 1.1 1.2 1.3";
+        let parsed = parse_save_transform(line).unwrap();
+        let expected = Transform {
+            translation: Vec3::new(1.0, 2.0, 3.0),
+            rotation: Quat::from_xyzw(0.1, 0.2, 0.3, 1.0),
+            scale: Vec3::new(1.1, 1.2, 1.3),
+        };
+
+        assert_eq!(parsed, expected);
+    }
+
     ///
     /// ```
     /// let parsed = parse_save_name("name asfd").unwrap();
@@ -141,37 +172,6 @@ mod parse {
         }
     }
 
-    ///
-    /// ```
-    /// let parsed = parse_save_uuid("uuid 339dd18f-761a-4997-b515-ef57f4dc2447").unwrap();
-    /// let expected = Uuid::parse_str("339dd18f-761a-4997-b515-ef57f4dc2447").unwrap();
-    ///
-    /// assert_eq!(parsed, expected);
-    /// ```
-    ///
-    pub(crate) fn parse_save_uuid(line: &str) -> Result<Uuid, SaveEntityParseError> {
-        let (remainder, _) = tag("uuid")(line)?;
-        let uuid = Uuid::try_parse(remainder.trim())?;
-        Ok(uuid)
-    }
-
-    mod test {
-        use super::*;
-
-        #[test]
-        fn test_parse_transform() {
-            let line =
-                "transform translation 1.0 2.0 3.0 rotation 0.1 0.2 0.3 1.0 scale 1.1 1.2 1.3";
-            let parsed = parse_save_transform(line).unwrap();
-            let expected = Transform {
-                translation: Vec3::new(1.0, 2.0, 3.0),
-                rotation: Quat::from_xyzw(0.1, 0.2, 0.3, 1.0),
-                scale: Vec3::new(1.1, 1.2, 1.3),
-            };
-
-            assert_eq!(parsed, expected);
-        }
-
     #[test]
     fn test_parse_name() {
         {
@@ -190,6 +190,20 @@ mod parse {
         }
     }
 
+    ///
+    /// ```
+    /// let parsed = parse_save_uuid("uuid 339dd18f-761a-4997-b515-ef57f4dc2447").unwrap();
+    /// let expected = Uuid::parse_str("339dd18f-761a-4997-b515-ef57f4dc2447").unwrap();
+    ///
+    /// assert_eq!(parsed, expected);
+    /// ```
+    ///
+    pub(crate) fn parse_save_uuid(line: &str) -> Result<Uuid, SaveEntityParseError> {
+        let (remainder, _) = tag("uuid")(line)?;
+        let uuid = Uuid::try_parse(remainder.trim())?;
+        Ok(uuid)
+    }
+
     #[test]
     fn test_parse_uuid() {
         let line = "uuid 1c16ab9a-5f79-4340-8469-4086f69c64f2";
@@ -198,6 +212,29 @@ mod parse {
 
         assert_eq!(parsed, expected);
     }
+
+    pub(crate) fn parse_save_model(line: &str) -> Result<(String, String), SaveEntityParseError> {
+        println!("{}", line);
+        let (rem, (_, _, gltf_name, _, scene_name)) = tuple((
+            tag("model"),
+            take(1usize),
+            parse_string,
+            take(1usize),
+            parse_string,
+        ))(line)?;
+
+        debug_assert_eq!(rem, "");
+
+        Ok((String::from(gltf_name), String::from(scene_name)))
+    }
+
+    #[test]
+    fn test_parse_model() {
+        let line = "model \"models/foo.glb\" \"My Scene\"";
+        let parsed = parse_save_model(line).unwrap();
+        let expected = (String::from("models/foo.glb"), String::from("My Scene"));
+
+        assert_eq!(parsed, expected);
     }
 }
 
@@ -221,14 +258,14 @@ impl AssetLoader for SaveEntityLoader {
         &'a self,
         reader: &'a mut Reader,
         _settings: &'a (),
-        _load_context: &'a mut LoadContext,
+        load_context: &'a mut LoadContext,
     ) -> BoxedFuture<'a, Result<Self::Asset, Self::Error>> {
         Box::pin(async move {
             let mut bytes = Vec::new();
             reader.read_to_end(&mut bytes).await?;
 
             let s = std::str::from_utf8(bytes.as_slice()).unwrap();
-            Ok(SaveEntity::parse(s)?)
+            Ok(SaveEntity::parse(s, load_context)?)
         })
     }
 
@@ -239,7 +276,15 @@ impl AssetLoader for SaveEntityLoader {
 
 fn test_save_entity(loader: Res<AssetServer>, mut commands: Commands) {
     let handle: Handle<SaveEntity> = loader.load("levels/00/entities/van.entity");
-    commands.spawn((SpatialBundle { ..default() }, handle, ShowAabbGizmo { ..default() }, Aabb { center: Vec3A::ZERO, half_extents: Vec3A::ONE }));
+    commands.spawn((
+        SpatialBundle { ..default() },
+        handle,
+        ShowAabbGizmo { ..default() },
+        Aabb {
+            center: Vec3A::ZERO,
+            half_extents: Vec3A::ONE,
+        },
+    ));
 }
 
 fn check_loaded_entity_assets(
@@ -247,6 +292,7 @@ fn check_loaded_entity_assets(
     mut events: EventReader<AssetEvent<SaveEntity>>,
     save_entities: Res<Assets<SaveEntity>>,
     mut commands: Commands,
+    gltfs: Res<Assets<Gltf>>,
 ) {
     events.read().for_each(|event| {
         match event {
@@ -256,7 +302,10 @@ fn check_loaded_entity_assets(
                     .filter(|(_, handle)| handle.id() == *id)
                     .for_each(|(entity, _handle)| {
                         let saved = save_entities.get(*id).unwrap();
-                        debug!("Updating entity {:?} ({:?}) because asset changed", saved.name, saved.uuid);
+                        debug!(
+                            "Updating entity {:?} ({:?}) because asset changed",
+                            saved.name, saved.uuid
+                        );
 
                         let mut e = commands.entity(entity);
                         // Apply transform
@@ -280,9 +329,18 @@ fn check_loaded_entity_assets(
                         } else {
                             e.remove::<EntityUuid>();
                         }
+                        // Apply Model 
+                        if let Some((gltf_handle, scene_name)) = &saved.model {
+                            // Find scene and update
+                            let gltf = gltfs.get(gltf_handle).unwrap();
+                            let scene_handle = gltf.named_scenes.get(scene_name).unwrap();
+                            e.insert(scene_handle.clone());
+                        } else {
+                            e.remove::<Handle<Scene>>();
+                        }
                     });
             }
-			_ => ()
+            _ => (),
         }
     })
 }