Merge #800

800: Add the preferred format query r=cwfitzgerald a=kvark

Just getting us synced up to the spec naming and API for the swapchains...

Co-authored-by: Dzmitry Malyshau <dmalyshau@mozilla.com>

player/src/main.rs

@@ -199,7 +199,7 @@ impl GlobalExt for wgc::hub::Global<IdentityPassThroughFactory> {
             }
             A::GetSwapChainTexture { id, parent_id } => {
                 if let Some(id) = id {
-                    self.swap_chain_get_next_texture::<B>(parent_id, id)
+                    self.swap_chain_get_current_texture_view::<B>(parent_id, id)
                         .view_id
                         .unwrap();
                 }

wgpu-core/src/swap_chain.rs

@@ -89,7 +89,18 @@ pub struct SwapChainOutput {
 }
 
 impl<G: GlobalIdentityHandlerFactory> Global<G> {
-    pub fn swap_chain_get_next_texture<B: GfxBackend>(
+    pub fn swap_chain_get_preferred_format<B: GfxBackend>(
+        &self,
+        _swap_chain_id: SwapChainId,
+    ) -> wgt::TextureFormat {
+        span!(_guard, INFO, "SwapChain::get_next_texture");
+        //TODO: we can query the formats like done in `device_create_swapchain`,
+        // but its not clear which format in the list to return.
+        // For now, return `Bgra8UnormSrgb` that we know is supported everywhere.
+        wgt::TextureFormat::Bgra8UnormSrgb
+    }
+
+    pub fn swap_chain_get_current_texture_view<B: GfxBackend>(
         &self,
         swap_chain_id: SwapChainId,
         view_id_in: Input<G, TextureViewId>,