Add get_default_configure for Surface to simplify user creation o…

…f `SurfaceConfiguration`

CHANGELOG.md

@@ -117,6 +117,7 @@ SurfaceConfiguration {
 - Address Clippy 0.1.63 complaints. By @jimblandy in [#2977](https://github.com/gfx-rs/wgpu/pull/2977)
 - Don't use `PhantomData` for `IdentityManager`'s `Input` type. By @jimblandy in [#2972](https://github.com/gfx-rs/wgpu/pull/2972)
 - Changed Naga variant in ShaderSource to `Cow<'static, Module>`, to allow loading global variables by @daxpedda in [#2903](https://github.com/gfx-rs/wgpu/pull/2903)
+- Add `get_default_configure` for `Surface` to simplify user creation of `SurfaceConfiguration`. By @jinleili in [#3034](https://github.com/gfx-rs/wgpu/pull/3034)
 
 #### Metal
 - Extract the generic code into `get_metal_layer` by @jinleili in [#2826](https://github.com/gfx-rs/wgpu/pull/2826)

wgpu/examples/framework.rs

@@ -267,14 +267,7 @@ fn start<E: Example>(
     }: Setup,
 ) {
     let spawner = Spawner::new();
-    let mut config = wgpu::SurfaceConfiguration {
-        usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
-        format: surface.get_supported_formats(&adapter)[0],
-        width: size.width,
-        height: size.height,
-        present_mode: wgpu::PresentMode::Fifo,
-        alpha_mode: surface.get_supported_alpha_modes(&adapter)[0],
-    };
+    let mut config = surface.get_default_configure(&adapter, size.width, size.height);
     surface.configure(&device, &config);
 
     log::info!("Initializing the example...");

wgpu/src/lib.rs

@@ -3690,6 +3690,23 @@ impl Surface {
         Context::surface_get_supported_alpha_modes(&*self.context, &self.id, &adapter.id)
     }
 
+    /// Return a default `SurfaceConfiguration` from width and height to use for the [`Surface`] with this adapter.
+    pub fn get_default_configure(
+        &self,
+        adapter: &Adapter,
+        width: u32,
+        height: u32,
+    ) -> wgt::SurfaceConfiguration {
+        wgt::SurfaceConfiguration {
+            usage: wgt::TextureUsages::RENDER_ATTACHMENT,
+            format: self.get_supported_formats(adapter)[0],
+            width,
+            height,
+            present_mode: self.get_supported_present_modes(adapter)[0],
+            alpha_mode: wgt::CompositeAlphaMode::Auto,
+        }
+    }
+
     /// Initializes [`Surface`] for presentation.
     ///
     /// # Panics