fix: material batching/wrong texture issue

* fix: incorrect material batching

Signed-off-by: Schmarni <marnistromer@gmail.com>

* fix: prevent memory leak with batched materials

Signed-off-by: Schmarni <marnistromer@gmail.com>

---------

Signed-off-by: Schmarni <marnistromer@gmail.com>

src/nodes/drawable/model.rs

@@ -22,11 +22,18 @@ use stereokit_rust::sk::MainThreadToken;
 use stereokit_rust::{material::Material, model::Model as SKModel, tex::Tex, util::Color128};
 
 pub struct MaterialWrapper(pub Material);
+impl Drop for MaterialWrapper {
+	fn drop(&mut self) {
+		MATERIAL_REGISTRY.remove(self);
+	}
+}
+
 impl Hash for MaterialWrapper {
 	fn hash<H: Hasher>(&self, state: &mut H) {
 		self.0.get_shader().0.as_ptr().hash(state);
 		for param in self.0.get_all_param_info() {
-			param.to_string().hash(state)
+			param.name.hash(state);
+			param.to_string().hash(state);
 		}
 		self.0.get_chain().map(MaterialWrapper).hash(state)
 	}
@@ -59,10 +66,9 @@ unsafe impl Send for MaterialWrapper {}
 unsafe impl Sync for MaterialWrapper {}
 
 #[derive(Default)]
-struct MaterialRegistry(Mutex<FxHashMap<u64, String>>);
+struct MaterialRegistry(Mutex<FxHashMap<u64, Weak<MaterialWrapper>>>);
 impl MaterialRegistry {
 	fn add_or_get(&self, material: Arc<MaterialWrapper>) -> Arc<MaterialWrapper> {
-		let mut lock = self.0.lock();
 		let hash = {
 			use std::hash::{Hash, Hasher};
 			let mut hasher = std::collections::hash_map::DefaultHasher::new();
@@ -70,15 +76,26 @@ impl MaterialRegistry {
 			hasher.finish()
 		};
 
-		if let Some(id) = lock.get(&hash) {
-			if let Ok(existing) = Material::find(id) {
-				return Arc::new(MaterialWrapper(existing));
+		let mut lock = self.0.lock();
+		if let Some(mat) = lock.get(&hash) {
+			if let Some(mat) = mat.upgrade() {
+				return mat;
 			}
 		}
 
-		lock.insert(hash, material.0.get_id().to_string());
+		lock.insert(hash, Arc::downgrade(&material));
 		material
 	}
+	fn remove(&self, material: &MaterialWrapper) {
+		let hash = {
+			use std::hash::{Hash, Hasher};
+			let mut hasher = std::collections::hash_map::DefaultHasher::new();
+			material.hash(&mut hasher);
+			hasher.finish()
+		};
+		let mut lock = self.0.lock();
+		lock.remove(&hash);
+	}
 }
 
 static MATERIAL_REGISTRY: Lazy<MaterialRegistry> = Lazy::new(MaterialRegistry::default);
@@ -132,6 +149,7 @@ pub struct ModelPart {
 	path: String,
 	space: Arc<Spatial>,
 	model: Weak<Model>,
+	material: Mutex<Option<Arc<MaterialWrapper>>>,
 	pending_material_parameters: Mutex<FxHashMap<String, MaterialParameter>>,
 	pending_material_replacement: Mutex<Option<Arc<MaterialWrapper>>>,
 	aliases: AliasList,
@@ -205,6 +223,7 @@ impl ModelPart {
 			pending_material_parameters: Mutex::new(FxHashMap::default()),
 			pending_material_replacement: Mutex::new(None),
 			aliases: AliasList::default(),
+			material: Mutex::new(part.get_material().map(MaterialWrapper).map(Arc::new)),
 		});
 		node.add_aspect_raw(model_part.clone());
 		parts.push(model_part.clone());
@@ -231,7 +250,10 @@ impl ModelPart {
 		};
 		let shared_material =
 			MATERIAL_REGISTRY.add_or_get(Arc::new(MaterialWrapper(replacement.copy())));
+
+		let mut lock = self.material.lock();
 		part.material(&shared_material.0);
+		lock.replace(shared_material);
 	}
 
 	fn update(&self) {
@@ -258,7 +280,9 @@ impl ModelPart {
 		};
 
 		if let Some(material_replacement) = self.pending_material_replacement.lock().take() {
+			let mut lock = self.material.lock();
 			part.material(&material_replacement.0);
+			lock.replace(material_replacement);
 		}
 
 		'mat_params: {
@@ -274,7 +298,9 @@ impl ModelPart {
 
 				let shared_material =
 					MATERIAL_REGISTRY.add_or_get(Arc::new(MaterialWrapper(new_material)));
+				let mut lock = self.material.lock();
 				part.material(&shared_material.0);
+				lock.replace(shared_material);
 			}
 		}
 	}