Update all the examples to handle asset locking.

Author: andriyDev

examples/3d/animated_material.rs

@@ -54,7 +54,7 @@ fn animate_materials(
     mut materials: ResMut<Assets<StandardMaterial>>,
 ) {
     for material_handle in material_handles.iter() {
-        if let Some(material) = materials.get_mut(material_handle) {
+        if let Ok(material) = materials.get_mut(material_handle) {
             if let Color::Hsla(ref mut hsla) = material.base_color {
                 *hsla = hsla.rotate_hue(time.delta_seconds() * 100.0);
             }

examples/3d/parallax_mapping.rs

@@ -94,7 +94,9 @@ fn update_parallax_depth_scale(
     }
     if *depth_update {
         let mut text = text.single_mut();
-        for (_, mat) in materials.iter_mut() {
+        for (_, mut mat) in materials.iter_mut() {
+            let mat = mat.as_mut().expect("The material is unlocked");
+
             let current_depth = mat.parallax_depth_scale;
             let new_depth = current_depth.lerp(target_depth.0, DEPTH_CHANGE_RATE);
             mat.parallax_depth_scale = new_depth;
@@ -120,7 +122,8 @@ fn switch_method(
     let mut text = text.single_mut();
     text.sections[2].value = format!("Method: {}\n", *current);
 
-    for (_, mat) in materials.iter_mut() {
+    for (_, mut mat) in materials.iter_mut() {
+        let mat = mat.as_mut().expect("The material is unlocked");
         mat.parallax_mapping_method = current.0;
     }
 }
@@ -143,7 +146,8 @@ fn update_parallax_layers(
     let mut text = text.single_mut();
     text.sections[1].value = format!("Layers: {layer_count:.0}\n");
 
-    for (_, mat) in materials.iter_mut() {
+    for (_, mut mat) in materials.iter_mut() {
+        let mat = mat.as_mut().expect("The material is unlocked");
         mat.max_parallax_layer_count = layer_count;
     }
 }

examples/3d/tonemapping.rs

@@ -230,7 +230,7 @@ fn drag_drop_image(
     };
 
     for mat_h in &image_mat {
-        if let Some(mat) = materials.get_mut(mat_h) {
+        if let Ok(mat) = materials.get_mut(mat_h) {
             mat.base_color_texture = Some(new_image.clone());
 
             // Despawn the image viewer instructions

examples/3d/transparency_3d.rs

@@ -117,7 +117,8 @@ fn setup(
 ///   6/8 opaque, then 5/8, etc.
 pub fn fade_transparency(time: Res<Time>, mut materials: ResMut<Assets<StandardMaterial>>) {
     let alpha = (ops::sin(time.elapsed_seconds()) / 2.0) + 0.5;
-    for (_, material) in materials.iter_mut() {
+    for (_, mut material) in materials.iter_mut() {
+        let material = material.as_mut().expect("The material is unlocked");
         material.base_color.set_alpha(alpha);
     }
 }

examples/animation/animation_masks.rs

@@ -341,7 +341,7 @@ fn handle_button_toggles(
         // iterate just for clarity's sake.)
         for (animation_graph_handle, animation_player) in animation_players.iter_mut() {
             // The animation graph needs to have loaded.
-            let Some(animation_graph) = animation_graphs.get_mut(animation_graph_handle) else {
+            let Ok(animation_graph) = animation_graphs.get_mut(animation_graph_handle) else {
                 continue;
             };
 

examples/asset/alter_mesh.rs

@@ -203,7 +203,7 @@ fn alter_mesh(
     };
 
     // Obtain a mutable reference to the Mesh asset.
-    let Some(mesh) = meshes.get_mut(handle) else {
+    let Ok(mesh) = meshes.get_mut(handle) else {
         return;
     };
 

examples/asset/alter_sprite.rs

@@ -150,7 +150,7 @@ fn alter_asset(mut images: ResMut<Assets<Image>>, left_bird: Query<&Handle<Image
     };
 
     // Obtain a mutable reference to the Image asset.
-    let Some(image) = images.get_mut(handle) else {
+    let Ok(image) = images.get_mut(handle) else {
         return;
     };
 

examples/asset/asset_decompression.rs

@@ -3,7 +3,7 @@
 use bevy::{
     asset::{
         io::{Reader, VecReader},
-        AssetLoader, ErasedLoadedAsset, LoadContext, LoadDirectError,
+        AssetLoader, AssetPresence, ErasedLoadedAsset, LoadContext, LoadDirectError,
     },
     prelude::*,
     reflect::TypePath,
@@ -124,8 +124,10 @@ fn decompress<A: Asset>(
     query: Query<(Entity, &Compressed<A>)>,
 ) {
     for (entity, Compressed { compressed, .. }) in query.iter() {
-        let Some(GzAsset { uncompressed }) = compressed_assets.remove(compressed) else {
-            continue;
+        let GzAsset { uncompressed } = match compressed_assets.remove(compressed) {
+            AssetPresence::None => continue,
+            AssetPresence::Unlocked(asset) => asset,
+            AssetPresence::Locked(_) => panic!("this example does not lock assets"),
         };
 
         let uncompressed = uncompressed.take::<A>().unwrap();

examples/ui/ui_material.rs

@@ -89,7 +89,7 @@ fn animate(
 ) {
     let duration = 2.0;
     for handle in &q {
-        if let Some(material) = materials.get_mut(handle) {
+        if let Ok(material) = materials.get_mut(handle) {
             // rainbow color effect
             let new_color = Color::hsl((time.elapsed_seconds() * 60.0) % 360.0, 1., 0.5);
             let border_color = Color::hsl((time.elapsed_seconds() * 60.0) % 360.0, 0.75, 0.75);