WIP: FSR3 by cwfitzgerald · Pull Request #21669 · bevyengine/bevy

cwfitzgerald · 2025-10-27T23:05:44Z

Objective

Closes Support for AMD FSR 2.0 #5232
Integrate FSR3 cross platform.

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github-actions · 2025-10-27T23:05:53Z

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github-actions · 2025-10-27T23:12:09Z

Your PR caused a change in the graphical output of an example or rendering test. This might be intentional, but it could also mean that something broke!
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atlv24 · 2025-10-27T23:19:49Z

crates/bevy_anti_alias/src/fsr3/mod.rs

+            camera_fov_y,
+            camera_near,
+            camera_far,
+            frame_time_delta: time.delta_secs() * 1000.0,


why * 1000.0?

Milliseconds

atlv24 · 2025-10-27T23:28:34Z

examples/3d/anti_aliasing.rs

@@ -310,7 +338,7 @@ fn update_ui(
    #[cfg(all(feature = "dlss", not(feature = "force_disable_dlss")))]
    let (projection, fxaa, smaa, taa, cas, msaa, dlss) = *camera;


probably want fsr in both code paths, otherwise dlss would kind of be a negative feature?

JMS55 · 2025-10-27T23:27:28Z

examples/3d/anti_aliasing.rs

+    MipBias,
+    DepthPrepass,
+    MotionVectorPrepass,
+    Fsr3,


Nit: Move Fsr3 to the front of the list

JMS55 · 2025-10-27T23:28:09Z

crates/bevy_core_pipeline/src/core_3d/mod.rs

        MotionBlur,
        Taa,
+        Fsr3,
        DlssSuperResolution,


Idk if we need a generic TSR label or something long term, but for now this is fine.

JMS55 · 2025-10-27T23:31:41Z

crates/bevy_anti_alias/src/fsr3/mod.rs

+//! AMD FidelityFX Super Resolution 3 (FSR3).
+//!
+//! FSR3 is a temporal upscaling and anti-aliasing technique that uses
+//! machine learning-based upscaling to render at a lower resolution


Err it doesn't use ML?

Oops trusted copilot's suggestions too much

JMS55 · 2025-10-27T23:33:23Z

crates/bevy_anti_alias/src/fsr3/mod.rs

+/// Pros:
+/// * Much better performance by rendering at lower resolution
+/// * High quality temporal anti-aliasing
+/// * Works on AMD, NVIDIA, and Intel GPUs


Web support?

Yes but future, I'll revise this

Also what about macOS / android / iOS?

JMS55 · 2025-10-27T23:33:46Z

crates/bevy_anti_alias/src/fsr3/mod.rs

+/// * Much better performance by rendering at lower resolution
+/// * High quality temporal anti-aliasing
+/// * Works on AMD, NVIDIA, and Intel GPUs
+/// * Includes optional sharpening pass


Does the optional sharpening pass make sense to include? We already have RCAS built into Bevy.

I'd rather people use that, as it's compatible with TAA/DLSS, and will play better once we make a generic TSR abstraction.

I haven't actually wired it up yet in FSR, but it reuses an existing pass, so I would expect it to be faster.

JMS55 · 2025-10-27T23:38:20Z

crates/bevy_anti_alias/src/fsr3/mod.rs

+                MainPassResolutionOverride(render_resolution),
+            ));
+        } else {
+            // Update resolution override in case it changed


I haven't sat down to think about it, but why is this structured differently than the DLSS prepare code?

I was modeling after TAA more than DLSS, I'll have a better look how this can be made more consistent

Yeah, I would look at the DLSS code and copy that, it's much more 1:1 with how FSR should work.

JMS55 · 2025-10-27T23:38:42Z

crates/bevy_anti_alias/src/fsr3/mod.rs

+            .add_systems(
+                Render,
+                (
+                    prepare_fsr3_jitter_and_context.in_set(RenderSystems::ManageViews),


Needs .before(prepare_view_targets), since you modify the main camera usages.

JMS55 · 2025-10-27T23:39:17Z

crates/bevy_anti_alias/src/fsr3/mod.rs

+    mut commands: Commands,
+    mut texture_cache: ResMut<TextureCache>,
+    render_device: Res<RenderDevice>,
+    views: Query<(Entity, &ExtractedCamera, &ExtractedView, &Fsr3), With<Fsr3>>,


You don't need With if you already have &Fsr3 in your query.

JMS55 · 2025-10-27T23:41:01Z

crates/bevy_anti_alias/src/fsr3/mod.rs

+    render_device: Res<RenderDevice>,
+    views: Query<(Entity, &ExtractedCamera, &ExtractedView, &Fsr3), With<Fsr3>>,
+) {
+    for (entity, camera, view, fsr3) in &views {


Please follow the newer pattern for texture-prepare systems as used in https://github.com/bevyengine/bevy/blob/main/crates/bevy_solari/src/realtime/prepare.rs (you can just store TextureView now as textures can be retrieved from views, I should update the solari code)

JMS55 · 2025-10-27T23:42:15Z

crates/bevy_anti_alias/src/fsr3/mod.rs

+///
+/// See [`Fsr3`] for more details.
+#[derive(Default)]
+pub struct Fsr3Plugin;


Please split this file up to match the DLSS file structure (mode, extract, prepare, node).

github-actions · 2025-10-29T18:49:46Z

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Please review the instructions for writing release notes, then expand or revise the content in the release notes directory to showcase your changes.

cwfitzgerald · 2026-03-10T04:28:25Z

Hey! I have zero time to actually work on this PR, so am turning it over to any interested contributors.

WIP: FSR3

55927c2

atlv24 reviewed Oct 27, 2025

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JMS55 suggested changes Oct 27, 2025

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alice-i-cecile added C-Feature A new feature, making something new possible A-Rendering Drawing game state to the screen M-Release-Note Work that should be called out in the blog due to impact labels Oct 29, 2025

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		@@ -310,7 +338,7 @@ fn update_ui(
		#[cfg(all(feature = "dlss", not(feature = "force_disable_dlss")))]
		let (projection, fxaa, smaa, taa, cas, msaa, dlss) = *camera;

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cwfitzgerald commented Oct 27, 2025

Objective

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