Do MTL feature check for Depth Clamping (#1933)

* Do MTL feature check for Depth Clamping

(cherry picked from commit ae6e83c3b2e695918ffcd8bbf7ce3a1b32e2b36e)

# Conflicts:
#	wgpu-hal/src/metal/adapter.rs

* make feature support check conform

* clean code

* avoid same featureset checks multiple times

* cargo fmt'ed

wgpu-hal/src/metal/adapter.rs

@@ -850,6 +850,9 @@ impl super::PrivateCapabilities {
             } else {
                 Self::version_at_least(major, minor, 11, 0)
             },
+            //Depth clipping is supported on all macOS GPU families and iOS family 4 and later
+            supports_depth_clamping: device.supports_feature_set(MTLFeatureSet::iOS_GPUFamily4_v1)
+                || os_is_mac,
         }
     }
 
@@ -857,7 +860,6 @@ impl super::PrivateCapabilities {
         use wgt::Features as F;
 
         let mut features = F::empty()
-            | F::DEPTH_CLAMPING
             | F::TEXTURE_COMPRESSION_BC
             | F::MAPPABLE_PRIMARY_BUFFERS
             | F::VERTEX_WRITABLE_STORAGE
@@ -865,6 +867,8 @@ impl super::PrivateCapabilities {
             | F::POLYGON_MODE_LINE
             | F::CLEAR_COMMANDS;
 
+        features.set(F::DEPTH_CLAMPING, self.supports_depth_clamping);
+
         features.set(
             F::TEXTURE_BINDING_ARRAY
                 | F::SAMPLED_TEXTURE_AND_STORAGE_BUFFER_ARRAY_NON_UNIFORM_INDEXING

wgpu-hal/src/metal/mod.rs

@@ -222,6 +222,7 @@ struct PrivateCapabilities {
     supports_arrays_of_textures: bool,
     supports_arrays_of_textures_write: bool,
     supports_mutability: bool,
+    supports_depth_clamping: bool,
 }
 
 #[derive(Clone, Debug)]