[rs] Fix Vulkan portability support on macOS

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
         include:
           - os: macos-10.15
             wasm: false
-            CHECK_COMMAND: cargo check --all-targets
+            CHECK_COMMAND: cargo check --all-targets --features vulkan-portability
             TEST_COMMAND: cargo test --all-targets --no-run
           - os: ubuntu-18.04
             wasm: false

wgpu/Cargo.toml

@@ -21,7 +21,7 @@ trace = ["serde", "wgc/trace"]
 replay = ["serde", "wgc/replay"]
 subscriber = ["wgc/subscriber"]
 # Make Vulkan backend available on platforms where it is by default not, e.g. macOS
-vulkan = ["wgc/gfx-backend-vulkan"]
+vulkan-portability = ["wgc/gfx-backend-vulkan"]
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies.wgc]
 package = "wgpu-core"

wgpu/src/lib.rs

@@ -1036,6 +1036,11 @@ impl Instance {
         }
     }
 
+    /// Creates a surface from `CoreAnimationLayer`.
+    ///
+    /// # Safety
+    ///
+    /// - layer must be a valid object to create a surface upon.
     #[cfg(any(target_os = "ios", target_os = "macos"))]
     pub unsafe fn create_surface_from_core_animation_layer(
         &self,
@@ -1043,9 +1048,7 @@ impl Instance {
     ) -> Surface {
         let surface = wgc::instance::Surface {
             #[cfg(feature = "vulkan-portability")]
-            vulkan: self.context.instance.vulkan.as_ref().map(|inst| {
-                inst.create_surface_from_layer(layer as *mut _, cfg!(debug_assertions))
-            }),
+            vulkan: None, //TODO: create_surface_from_layer ?
             metal: self.context.instance.metal.as_ref().map(|inst| {
                 inst.create_surface_from_layer(layer as *mut _, cfg!(debug_assertions))
             }),