metal: improve push | pop_debug_marker

wgpu-hal/Cargo.toml

@@ -79,7 +79,7 @@ winapi = { version = "0.3", features = ["libloaderapi", "windef", "winuser", "dc
 native = { package = "d3d12", git = "https://github.com/gfx-rs/d3d12-rs.git", rev = "ffe5e261da0a6cb85332b82ab310abd2a7e849f6", features = ["libloading"], optional = true }
 
 [target.'cfg(any(target_os="macos", target_os="ios"))'.dependencies]
-mtl = { package = "metal", git = "https://github.com/gfx-rs/metal-rs", rev = "a357159" }
+mtl = { package = "metal", git = "https://github.com/gfx-rs/metal-rs", rev = "1aaa903" }
 objc = "0.2.5"
 core-graphics-types = "0.1"
 

wgpu-hal/src/metal/command.rs

@@ -39,13 +39,15 @@ impl super::CommandEncoder {
         }
     }
 
-    fn enter_any(&mut self) -> &mtl::CommandEncoderRef {
+    fn enter_any(&mut self) -> Option<&mtl::CommandEncoderRef> {
         if let Some(ref encoder) = self.state.render {
-            encoder
+            Some(encoder)
         } else if let Some(ref encoder) = self.state.compute {
-            encoder
+            Some(encoder)
+        } else if let Some(ref encoder) = self.state.blit {
+            Some(encoder)
         } else {
-            self.enter_blit()
+            None
         }
     }
 
@@ -627,13 +629,23 @@ impl crate::CommandEncoder<super::Api> for super::CommandEncoder {
     }
 
     unsafe fn insert_debug_marker(&mut self, label: &str) {
-        self.enter_any().insert_debug_signpost(label);
+        if let Some(encoder) = self.enter_any() {
+            encoder.insert_debug_signpost(label);
+        }
     }
     unsafe fn begin_debug_marker(&mut self, group_label: &str) {
-        self.enter_any().push_debug_group(group_label);
+        if let Some(encoder) = self.enter_any() {
+            encoder.push_debug_group(group_label);
+        } else if let Some(ref buf) = self.raw_cmd_buf {
+            buf.push_debug_group(group_label);
+        }
     }
     unsafe fn end_debug_marker(&mut self) {
-        self.enter_any().pop_debug_group();
+        if let Some(encoder) = self.enter_any() {
+            encoder.pop_debug_group();
+        } else if let Some(ref buf) = self.raw_cmd_buf {
+            buf.pop_debug_group();
+        }
     }
 
     unsafe fn set_render_pipeline(&mut self, pipeline: &super::RenderPipeline) {