[rs] Move get_swap_chain_preferred_format from device to adapter

Squashed commit of the following:

commit 260976b10e3a54b253768d71e5e47c51b976c25c
Author: Niklas Korz <niklas@niklaskorz.de>
Date:   Mon Jan 11 20:23:31 2021 +0100

    Formatting

commit e3f837e1b6a81c8c7a9566ba6a2c6dd8adfbbde7
Author: Niklas Korz <niklas@niklaskorz.de>
Date:   Mon Jan 11 20:20:37 2021 +0100

    Update examples

commit b0774c0aa56fbdfe741dd6c0e86d55b8c6b42de3
Author: Niklas Korz <niklas@niklaskorz.de>
Date:   Mon Jan 11 19:31:29 2021 +0100

    Use adapter.get_swap_chain_preferred_format

wgpu/Cargo.toml

@@ -26,20 +26,20 @@ webgl = ["wgc"]
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies.wgc]
 package = "wgpu-core"
 git = "https://github.com/gfx-rs/wgpu"
-rev = "5b9cfeb9413175de366ec1e3d64ec6ee2feffa0e"
+rev = "ae3e5057aff64a8e6f13e75be661c0f8a98abcd5"
 features = ["raw-window-handle"]
 
 [target.'cfg(target_arch = "wasm32")'.dependencies.wgc]
 package = "wgpu-core"
 git = "https://github.com/gfx-rs/wgpu"
-rev = "5b9cfeb9413175de366ec1e3d64ec6ee2feffa0e"
+rev = "ae3e5057aff64a8e6f13e75be661c0f8a98abcd5"
 features = ["raw-window-handle"]
 optional = true
 
 [dependencies.wgt]
 package = "wgpu-types"
 git = "https://github.com/gfx-rs/wgpu"
-rev = "5b9cfeb9413175de366ec1e3d64ec6ee2feffa0e"
+rev = "ae3e5057aff64a8e6f13e75be661c0f8a98abcd5"
 
 [dependencies]
 arrayvec = "0.5"

wgpu/examples/framework.rs

@@ -201,7 +201,7 @@ fn start<E: Example>(
     let spawner = Spawner::new();
     let mut sc_desc = wgpu::SwapChainDescriptor {
         usage: wgpu::TextureUsage::RENDER_ATTACHMENT,
-        format: device.get_swap_chain_preferred_format(),
+        format: adapter.get_swap_chain_preferred_format(&surface),
         width: size.width,
         height: size.height,
         present_mode: wgpu::PresentMode::Mailbox,

wgpu/examples/hello-triangle/main.rs

@@ -44,7 +44,7 @@ async fn run(event_loop: EventLoop<()>, window: Window) {
         push_constant_ranges: &[],
     });
 
-    let swapchain_format = device.get_swap_chain_preferred_format();
+    let swapchain_format = adapter.get_swap_chain_preferred_format(&surface);
 
     let render_pipeline = device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
         label: None,

wgpu/examples/hello-windows/main.rs

@@ -27,12 +27,12 @@ impl ViewportDesc {
         }
     }
 
-    fn build(self, device: &wgpu::Device) -> Viewport {
+    fn build(self, adapter: &wgpu::Adapter, device: &wgpu::Device) -> Viewport {
         let size = self.window.inner_size();
 
         let sc_desc = wgpu::SwapChainDescriptor {
             usage: wgpu::TextureUsage::RENDER_ATTACHMENT,
-            format: device.get_swap_chain_preferred_format(),
+            format: adapter.get_swap_chain_preferred_format(&self.surface),
             width: size.width,
             height: size.height,
             present_mode: wgpu::PresentMode::Fifo,
@@ -92,7 +92,7 @@ async fn run(event_loop: EventLoop<()>, viewports: Vec<(Window, wgpu::Color)>) {
 
     let mut viewports: HashMap<WindowId, Viewport> = viewports
         .into_iter()
-        .map(|desc| (desc.window.id(), desc.build(&device)))
+        .map(|desc| (desc.window.id(), desc.build(&adapter, &device)))
         .collect();
 
     event_loop.run(move |event, _, control_flow| {

wgpu/src/backend/direct.rs

@@ -673,6 +673,19 @@ impl crate::Context for Context {
         ready(Ok((device, device_id)))
     }
 
+    fn adapter_get_swap_chain_preferred_format(
+        &self,
+        adapter: &Self::AdapterId,
+        surface: &Self::SurfaceId,
+    ) -> TextureFormat {
+        let global = &self.0;
+        match wgc::gfx_select!(adapter => global.adapter_get_swap_chain_preferred_format(*adapter, *surface))
+        {
+            Ok(swap_chain_preferred_format) => swap_chain_preferred_format,
+            Err(err) => self.handle_error_fatal(err, "Adapter::get_swap_chain_preferred_format"),
+        }
+    }
+
     fn adapter_features(&self, adapter: &Self::AdapterId) -> Features {
         let global = &self.0;
         match wgc::gfx_select!(*adapter => global.adapter_features(*adapter)) {
@@ -713,15 +726,6 @@ impl crate::Context for Context {
         }
     }
 
-    fn device_get_swap_chain_preferred_format(&self, device: &Self::DeviceId) -> TextureFormat {
-        let global = &self.0;
-        match wgc::gfx_select!(device.id => global.device_get_swap_chain_preferred_format(device.id))
-        {
-            Ok(swap_chain_preferred_format) => swap_chain_preferred_format,
-            Err(err) => self.handle_error_fatal(err, "Device::get_swap_chain_preferred_format"),
-        }
-    }
-
     fn device_create_swap_chain(
         &self,
         device: &Self::DeviceId,

wgpu/src/backend/web.rs

@@ -954,6 +954,15 @@ impl crate::Context for Context {
         )
     }
 
+    fn adapter_get_swap_chain_preferred_format(
+        &self,
+        adapter: &Self::AdapterId,
+        surface: &Self::SurfaceId,
+    ) -> wgt::TextureFormat {
+        // TODO: web-sys bindings need to be updated to not return a promise
+        wgt::TextureFormat::Bgra8Unorm
+    }
+
     fn adapter_features(&self, _adapter: &Self::AdapterId) -> wgt::Features {
         // TODO: web-sys has no way of getting extensions on adapters
         wgt::Features::empty()
@@ -985,14 +994,6 @@ impl crate::Context for Context {
         wgt::Limits::default()
     }
 
-    fn device_get_swap_chain_preferred_format(
-        &self,
-        device: &Self::DeviceId,
-    ) -> wgt::TextureFormat {
-        // TODO: web-sys bindings need to be updated to not return a promise
-        wgt::TextureFormat::Bgra8Unorm
-    }
-
     fn device_create_swap_chain(
         &self,
         device: &Self::DeviceId,

wgpu/src/lib.rs

@@ -189,13 +189,17 @@ trait Context: Debug + Send + Sized + Sync {
         desc: &DeviceDescriptor,
         trace_dir: Option<&std::path::Path>,
     ) -> Self::RequestDeviceFuture;
+    fn adapter_get_swap_chain_preferred_format(
+        &self,
+        adapter: &Self::AdapterId,
+        surface: &Self::SurfaceId,
+    ) -> TextureFormat;
     fn adapter_features(&self, adapter: &Self::AdapterId) -> Features;
     fn adapter_limits(&self, adapter: &Self::AdapterId) -> Limits;
     fn adapter_get_info(&self, adapter: &Self::AdapterId) -> AdapterInfo;
 
     fn device_features(&self, device: &Self::DeviceId) -> Features;
     fn device_limits(&self, device: &Self::DeviceId) -> Limits;
-    fn device_get_swap_chain_preferred_format(&self, device: &Self::DeviceId) -> TextureFormat;
     fn device_create_swap_chain(
         &self,
         device: &Self::DeviceId,
@@ -1384,6 +1388,11 @@ impl Adapter {
         }
     }
 
+    /// Returns an optimal texture format to use for the [`SwapChain`] with this adapter.
+    pub fn get_swap_chain_preferred_format(&self, surface: &Surface) -> TextureFormat {
+        Context::adapter_get_swap_chain_preferred_format(&*self.context, &self.id, &surface.id)
+    }
+
     /// List all features that are supported with this adapter.
     ///
     /// Features must be explicitly requested in [`Adapter::request_device`] in order
@@ -1428,11 +1437,6 @@ impl Device {
         Context::device_limits(&*self.context, &self.id)
     }
 
-    /// Returns an optimal texture format to use for the [`SwapChain`] with this device.
-    pub fn get_swap_chain_preferred_format(&self) -> TextureFormat {
-        Context::device_get_swap_chain_preferred_format(&*self.context, &self.id)
-    }
-
     /// Creates a shader module from either SPIR-V or WGSL source code.
     pub fn create_shader_module(&self, desc: &ShaderModuleDescriptor) -> ShaderModule {
         ShaderModule {