Bevy 0.19, Windows Transparent features seem does not work properly.

[eoqci]

Bevy version and features

• Bevy: 0.19.0
• Bevy is used with the default features.
• The application uses Bevy's windows transparent feature.

[Optional] Relevant system information

Win 11

`AdapterInfo { name: "NVIDIA GeForce RTX 3060 Laptop GPU", vendor: 4318, device: 9504, device_type: DiscreteGpu, device_pci_bus_id: "0000:01:00.0", driver: "NVIDIA", driver_info: "591.86", backend: Vulkan, subgroup_min_size: 32, subgroup_max_size: 32, transient_saves_memory: false }`

What you did

I'm trying to build my application with purely transparent feature. Like a mini game overlay on user screen.

What went wrong

• It does not work like what I want. All I got is a screen that covered with black and the red square that i created. The black space supposed to be transparent but seem it doesn't work anyway.

Additional information

My code (I also tried the example from bevy engine to see if it still work for me but yeah, its not...sadly):

use bevy::{
    prelude::*,
    window::{CompositeAlphaMode, WindowResolution},
};

fn main() {
    App::new()
        .insert_resource(ClearColor(Color::NONE))
        .add_plugins(DefaultPlugins.set(WindowPlugin {
            primary_window: Some(Window {
                title: "Task Bar Hero".into(),
                decorations: false,
                transparent: true,
                resolution: WindowResolution::new(1280, 720),
                position: WindowPosition::Centered(MonitorSelection::Primary),
                resizable: false,
                // #[cfg(target_os = "macos")]
                // composite_alpha_mode: CompositeAlphaMode::PostMultiplied,
                // #[cfg(target_os = "linux")]
                // composite_alpha_mode: CompositeAlphaMode::PreMultiplied,
                ..default()
            }),
            ..default()
        }))
        // .init_state::<GameState>()
        .add_systems(Startup, setup)
        .run();
}

fn setup(mut commands: Commands) {
    commands.spawn(Camera2d);
    commands.spawn(Sprite {
        color: Color::srgb(0.8, 0.2, 0.2),
        custom_size: Some(Vec2::splat(100.0)),
        ..default()
    });
}

• screenshot:

• logs (there are no error, i guess):

2026-08-11T14:54:34.179575Z  INFO bevy_diagnostic::system_information_diagnostics_plugin::internal: SystemInfo { os: "Windows 11 Home Single Language", kernel: "26200", cpu: "AMD Ryzen 7 5800H with Radeon Graphics", core_count: "8", memory: "15.4 GiB" }
2026-08-11T14:54:34.635862Z  INFO bevy_render::renderer: AdapterInfo { name: "NVIDIA GeForce RTX 3060 Laptop GPU", vendor: 4318, device: 9504, device_type: DiscreteGpu, device_pci_bus_id: "0000:01:00.0", driver: "NVIDIA", driver_info: "591.86", backend: Vulkan, subgroup_min_size: 32, subgroup_max_size: 32, transient_saves_memory: false }
2026-08-11T14:54:35.408222Z  INFO bevy_pbr::cluster: GPU clustering is supported on this device.
2026-08-11T14:54:35.408491Z  INFO bevy_render::batching::gpu_preprocessing: GPU preprocessing is fully supported on this device.
2026-08-11T14:54:35.409498Z  INFO bevy_winit::system: Creating new window Task Bar Hero (66v0)

idk where causing the problem but if it still doesnt work, i may need to try implement the transparent feature in the other way... Thanks for reading all of this and sorry for my bad english.

[alice-i-cecile]

Which operating system are you on? Does this work in previous Bevy versions for you?

[eoqci]

Which operating system are you on? Does this work in previous Bevy versions for you?

In the logs: Win 11 Home, I tried the 0.18 and 17 too, seem broken on me, havent try it on other computers

[PaperCow]

I was able to reproduce this on win 11 with a nvidia 3080. I found a similar issue on godot's github with a comment that mentioned it was a nvidia driver limitation with vulkan. Switching "Vulkan/OpenGL present method" to "Prefer native" in my NVIDIA control panel fixed the issue.

I was able to get it render properly without changing my driver settings by forcing DX12 and the wgpu presentation system to visual. Unfortunately the only way I could figure out how to do the presentation system change is to set an env var which doesn't feel great. There very well could be a better way but I don't know bevy/wgpu rendering code well at all and was kind of fumbling my way around to try and find a solution

 fn main() {
    // eww
    unsafe {
        std::env::set_var("WGPU_DX12_PRESENTATION_SYSTEM", "Visual");
    }
    App::new()
        .insert_resource(ClearColor(Color::NONE))
        .add_plugins(
            DefaultPlugins
                .set(WindowPlugin {
                    primary_window: Some(Window {
                        title: "Task Bar Hero".into(),
                        decorations: false,
                        transparent: true,
                        resolution: WindowResolution::new(1280, 720),
                        position: WindowPosition::Centered(MonitorSelection::Primary),
                        resizable: false,
                        composite_alpha_mode: CompositeAlphaMode::PreMultiplied,
                        ..default()
                    }),
                    ..default()
                })
                .set(RenderPlugin {
                    render_creation: WgpuSettings {
                        backends: Some(Backends::DX12),
                        ..default()
                    }
                    .into(),
                    ..default()
                }),
        )
        // .init_state::<GameState>()
        .add_systems(Startup, setup)
        .run();
}