Add tonemapping switch to bloom 2d example (#17789)

# Objective

Allow switching through available Tonemapping algorithms on `bloom_2d`
example to compare between them

## Solution

Add a resource to `bloom_2d` that holds current tonemapping algorithm, a
method to get the next one, and a check of key press to make the switch

## Testing

Ran `bloom_2d` example with modified code

## Showcase


https://github.com/user-attachments/assets/920b2d6a-b237-4b19-be9d-9b651b4dc913
Note: Sprite flashing is already described in #17763

Author: hukasu

examples/2d/bloom_2d.rs

@@ -73,16 +73,16 @@ fn setup(
 // ------------------------------------------------------------------------------------------------
 
 fn update_bloom_settings(
-    camera: Single<(Entity, Option<&mut Bloom>), With<Camera>>,
+    camera: Single<(Entity, &Tonemapping, Option<&mut Bloom>), With<Camera>>,
     mut text: Single<&mut Text>,
     mut commands: Commands,
     keycode: Res<ButtonInput<KeyCode>>,
     time: Res<Time>,
 ) {
-    let bloom = camera.into_inner();
+    let (camera_entity, tonemapping, bloom) = camera.into_inner();
 
     match bloom {
-        (entity, Some(mut bloom)) => {
+        Some(mut bloom) => {
             text.0 = "Bloom (Toggle: Space)\n".to_string();
             text.push_str(&format!("(Q/A) Intensity: {}\n", bloom.intensity));
             text.push_str(&format!(
@@ -112,7 +112,7 @@ fn update_bloom_settings(
             text.push_str(&format!("(I/K) Horizontal Scale: {}\n", bloom.scale.x));
 
             if keycode.just_pressed(KeyCode::Space) {
-                commands.entity(entity).remove::<Bloom>();
+                commands.entity(camera_entity).remove::<Bloom>();
             }
 
             let dt = time.delta_secs();
@@ -182,12 +182,33 @@ fn update_bloom_settings(
             bloom.scale.x = bloom.scale.x.clamp(0.0, 16.0);
         }
 
-        (entity, None) => {
-            text.0 = "Bloom: Off (Toggle: Space)".to_string();
+        None => {
+            text.0 = "Bloom: Off (Toggle: Space)\n".to_string();
 
             if keycode.just_pressed(KeyCode::Space) {
-                commands.entity(entity).insert(Bloom::default());
+                commands.entity(camera_entity).insert(Bloom::default());
             }
         }
     }
+
+    text.push_str(&format!("(O) Tonemapping: {:?}\n", tonemapping));
+    if keycode.just_pressed(KeyCode::KeyO) {
+        commands
+            .entity(camera_entity)
+            .insert(next_tonemap(tonemapping));
+    }
+}
+
+/// Get the next Tonemapping algorithm
+fn next_tonemap(tonemapping: &Tonemapping) -> Tonemapping {
+    match tonemapping {
+        Tonemapping::None => Tonemapping::AcesFitted,
+        Tonemapping::AcesFitted => Tonemapping::AgX,
+        Tonemapping::AgX => Tonemapping::BlenderFilmic,
+        Tonemapping::BlenderFilmic => Tonemapping::Reinhard,
+        Tonemapping::Reinhard => Tonemapping::ReinhardLuminance,
+        Tonemapping::ReinhardLuminance => Tonemapping::SomewhatBoringDisplayTransform,
+        Tonemapping::SomewhatBoringDisplayTransform => Tonemapping::TonyMcMapface,
+        Tonemapping::TonyMcMapface => Tonemapping::None,
+    }
 }