Bevy change bnackend

[ilumar589]

I've asked this on discord already so I'll just copy paste. Hi. I have a reported problem with the vulkan backend #3780 (comment) . Is there any way to force bevy and wgpu to use a different backend ? Or force them to enable the semaphore feature mentioned in the error trace ? I really want to continue my bevy journey and this is a blocker for me 🙂

[ickk]

Yes! You ought to be able to insert a WgpuOptions resource that selects a specific wgpu backend.

Example demonstrating how to insert the resource: https://github.com/bevyengine/bevy/blob/main/examples/app/headless_defaults.rs

The list of wgpu backends: https://wgpu.rs/doc/wgpu/struct.Backends.html

[heavyrain266]

You can set it this way with simple variable and resource.

Source : here

​        ​// Setup native Graphics API for each platform. 
​        ​let​ platform_api ​= 
​                ​if​ ​cfg!​(target_os ​=​ ​"windows"​) { 
​                        Backends​::​DX12 
​                } ​else​ ​if​ ​cfg!​(target_os ​=​ ​"macos"​) { 
​                        Backends​::​METAL 
​                } ​else​ ​if​ ​cfg!​(target_os ​=​ ​"linux"​) { 
​                        Backends​::​VULKAN 
​                } ​else​ { 
​                        ​panic!​(​"Unsupported platform!"​); 
​                }; 
 
​        ​// Resources 
​        app 
​                .​insert_resource​( 
​                        WgpuOptions { 
​                            backends: ​Some​(platform_api), 
 
​                                ..​Default​::​default​() 
​                        } 
​                );

[ilumar589]

@ickk @heavyrain266 Thank you both. I've marked the first as an answer cause it was first, but thanks for the more detailed example @heavyrain266

[heavyrain266]

Github shows that he answered 3 minutes later 🧐

[ilumar589]

For me it shows the other way around 😆

[Cannedfood]

Updated answer for bevy 0.15.0:

App::new()
    .add_plugins(DefaultPlugins.set(RenderPlugin {
        render_creation: RenderCreation::Automatic(WgpuSettings {
            #[cfg(target_os = "windows")]
            backends: Some(Backends::DX12),
            ..default()
        }),
        ..default()
    }))