diff --git a/wgpu-core/src/command/render.rs b/wgpu-core/src/command/render.rs
index 883ae6ceee..a95ea4cdd5 100644
--- a/wgpu-core/src/command/render.rs
+++ b/wgpu-core/src/command/render.rs
@@ -1206,8 +1206,14 @@ impl<G: GlobalIdentityHandlerFactory> Global<G> {
                     }
                     RenderCommand::SetBlendConstant(ref color) => {
                         state.blend_constant = OptionalState::Set;
+                        let array = [
+                            color.r as f32,
+                            color.g as f32,
+                            color.b as f32,
+                            color.a as f32,
+                        ];
                         unsafe {
-                            raw.set_blend_constants(color);
+                            raw.set_blend_constants(&array);
                         }
                     }
                     RenderCommand::SetStencilReference(value) => {
diff --git a/wgpu-hal/src/dx12/command.rs b/wgpu-hal/src/dx12/command.rs
index dc7001b92e..7beffa8a01 100644
--- a/wgpu-hal/src/dx12/command.rs
+++ b/wgpu-hal/src/dx12/command.rs
@@ -46,6 +46,7 @@ impl crate::CommandEncoder<super::Api> for super::CommandEncoder {
         }
         self.list = Some(list);
         self.temp.clear();
+        self.has_pass_label = false;
         Ok(())
     }
     unsafe fn discard_encoding(&mut self) {
@@ -387,8 +388,18 @@ impl crate::CommandEncoder<super::Api> for super::CommandEncoder {
 
     // render
 
-    unsafe fn begin_render_pass(&mut self, desc: &crate::RenderPassDescriptor<super::Api>) {}
-    unsafe fn end_render_pass(&mut self) {}
+    unsafe fn begin_render_pass(&mut self, desc: &crate::RenderPassDescriptor<super::Api>) {
+        if let Some(label) = desc.label {
+            self.begin_debug_marker(label);
+            self.has_pass_label = true;
+        }
+    }
+    unsafe fn end_render_pass(&mut self) {
+        if self.has_pass_label {
+            self.end_debug_marker();
+            self.has_pass_label = false;
+        }
+    }
 
     unsafe fn set_bind_group(
         &mut self,
@@ -437,10 +448,32 @@ impl crate::CommandEncoder<super::Api> for super::CommandEncoder {
         binding: crate::BufferBinding<'a, super::Api>,
     ) {
     }
-    unsafe fn set_viewport(&mut self, rect: &crate::Rect<f32>, depth_range: Range<f32>) {}
-    unsafe fn set_scissor_rect(&mut self, rect: &crate::Rect<u32>) {}
-    unsafe fn set_stencil_reference(&mut self, value: u32) {}
-    unsafe fn set_blend_constants(&mut self, color: &wgt::Color) {}
+    unsafe fn set_viewport(&mut self, rect: &crate::Rect<f32>, depth_range: Range<f32>) {
+        let raw_vp = d3d12::D3D12_VIEWPORT {
+            TopLeftX: rect.x,
+            TopLeftY: rect.y,
+            Width: rect.w,
+            Height: rect.h,
+            MinDepth: depth_range.start,
+            MaxDepth: depth_range.end,
+        };
+        self.list.unwrap().RSSetViewports(1, &raw_vp);
+    }
+    unsafe fn set_scissor_rect(&mut self, rect: &crate::Rect<u32>) {
+        let raw_rect = d3d12::D3D12_RECT {
+            left: rect.x as i32,
+            top: rect.y as i32,
+            right: (rect.x + rect.w) as i32,
+            bottom: (rect.y + rect.h) as i32,
+        };
+        self.list.unwrap().RSSetScissorRects(1, &raw_rect);
+    }
+    unsafe fn set_stencil_reference(&mut self, value: u32) {
+        self.list.unwrap().set_stencil_reference(value);
+    }
+    unsafe fn set_blend_constants(&mut self, color: &[f32; 4]) {
+        self.list.unwrap().set_blend_factor(*color);
+    }
 
     unsafe fn draw(
         &mut self,
@@ -536,8 +569,18 @@ impl crate::CommandEncoder<super::Api> for super::CommandEncoder {
 
     // compute
 
-    unsafe fn begin_compute_pass(&mut self, desc: &crate::ComputePassDescriptor) {}
-    unsafe fn end_compute_pass(&mut self) {}
+    unsafe fn begin_compute_pass(&mut self, desc: &crate::ComputePassDescriptor) {
+        if let Some(label) = desc.label {
+            self.begin_debug_marker(label);
+            self.has_pass_label = true;
+        }
+    }
+    unsafe fn end_compute_pass(&mut self) {
+        if self.has_pass_label {
+            self.end_debug_marker();
+            self.has_pass_label = false;
+        }
+    }
 
     unsafe fn set_compute_pipeline(&mut self, pipeline: &Resource) {}
 
diff --git a/wgpu-hal/src/dx12/device.rs b/wgpu-hal/src/dx12/device.rs
index efcc088a13..2b2cad28e3 100644
--- a/wgpu-hal/src/dx12/device.rs
+++ b/wgpu-hal/src/dx12/device.rs
@@ -783,6 +783,7 @@ impl crate::Device<super::Api> for super::Device {
             shared: Arc::clone(&self.shared),
             list: None,
             free_lists: Vec::new(),
+            has_pass_label: false,
             temp: super::Temp::default(),
         })
     }
diff --git a/wgpu-hal/src/dx12/mod.rs b/wgpu-hal/src/dx12/mod.rs
index 244d070d5d..30e26561d7 100644
--- a/wgpu-hal/src/dx12/mod.rs
+++ b/wgpu-hal/src/dx12/mod.rs
@@ -228,6 +228,7 @@ pub struct CommandEncoder {
     shared: Arc<DeviceShared>,
     list: Option<native::GraphicsCommandList>,
     free_lists: Vec<native::GraphicsCommandList>,
+    has_pass_label: bool,
     temp: Temp,
 }
 
diff --git a/wgpu-hal/src/empty.rs b/wgpu-hal/src/empty.rs
index 3c6a51eaec..c2710e4532 100644
--- a/wgpu-hal/src/empty.rs
+++ b/wgpu-hal/src/empty.rs
@@ -322,7 +322,7 @@ impl crate::CommandEncoder<Api> for Encoder {
     unsafe fn set_viewport(&mut self, rect: &crate::Rect<f32>, depth_range: Range<f32>) {}
     unsafe fn set_scissor_rect(&mut self, rect: &crate::Rect<u32>) {}
     unsafe fn set_stencil_reference(&mut self, value: u32) {}
-    unsafe fn set_blend_constants(&mut self, color: &wgt::Color) {}
+    unsafe fn set_blend_constants(&mut self, color: &[f32; 4]) {}
 
     unsafe fn draw(
         &mut self,
diff --git a/wgpu-hal/src/gles/command.rs b/wgpu-hal/src/gles/command.rs
index 5fb632f330..b5e8ff8355 100644
--- a/wgpu-hal/src/gles/command.rs
+++ b/wgpu-hal/src/gles/command.rs
@@ -767,14 +767,8 @@ impl crate::CommandEncoder<super::Api> for super::CommandEncoder {
         self.state.stencil.back.reference = value;
         self.rebind_stencil_func();
     }
-    unsafe fn set_blend_constants(&mut self, color: &wgt::Color) {
-        let color = [
-            color.r as f32,
-            color.g as f32,
-            color.b as f32,
-            color.a as f32,
-        ];
-        self.cmd_buffer.commands.push(C::SetBlendConstant(color));
+    unsafe fn set_blend_constants(&mut self, color: &[f32; 4]) {
+        self.cmd_buffer.commands.push(C::SetBlendConstant(*color));
     }
 
     unsafe fn draw(
diff --git a/wgpu-hal/src/lib.rs b/wgpu-hal/src/lib.rs
index 97ae478821..4c8f434944 100644
--- a/wgpu-hal/src/lib.rs
+++ b/wgpu-hal/src/lib.rs
@@ -437,7 +437,7 @@ pub trait CommandEncoder<A: Api>: Send + Sync {
     unsafe fn set_viewport(&mut self, rect: &Rect<f32>, depth_range: Range<f32>);
     unsafe fn set_scissor_rect(&mut self, rect: &Rect<u32>);
     unsafe fn set_stencil_reference(&mut self, value: u32);
-    unsafe fn set_blend_constants(&mut self, color: &wgt::Color);
+    unsafe fn set_blend_constants(&mut self, color: &[f32; 4]);
 
     unsafe fn draw(
         &mut self,
diff --git a/wgpu-hal/src/metal/command.rs b/wgpu-hal/src/metal/command.rs
index e395f9320c..5fb648e151 100644
--- a/wgpu-hal/src/metal/command.rs
+++ b/wgpu-hal/src/metal/command.rs
@@ -673,14 +673,9 @@ impl crate::CommandEncoder<super::Api> for super::CommandEncoder {
         let encoder = self.state.render.as_ref().unwrap();
         encoder.set_stencil_front_back_reference_value(value, value);
     }
-    unsafe fn set_blend_constants(&mut self, color: &wgt::Color) {
+    unsafe fn set_blend_constants(&mut self, color: &[f32; 4]) {
         let encoder = self.state.render.as_ref().unwrap();
-        encoder.set_blend_color(
-            color.r as f32,
-            color.g as f32,
-            color.b as f32,
-            color.a as f32,
-        );
+        encoder.set_blend_color(color[0], color[1], color[2], color[3]);
     }
 
     unsafe fn draw(
diff --git a/wgpu-hal/src/vulkan/command.rs b/wgpu-hal/src/vulkan/command.rs
index fded155bd2..d87a7361e1 100644
--- a/wgpu-hal/src/vulkan/command.rs
+++ b/wgpu-hal/src/vulkan/command.rs
@@ -568,16 +568,8 @@ impl crate::CommandEncoder<super::Api> for super::CommandEncoder {
             .raw
             .cmd_set_stencil_reference(self.active, vk::StencilFaceFlags::all(), value);
     }
-    unsafe fn set_blend_constants(&mut self, color: &wgt::Color) {
-        let vk_constants = [
-            color.r as f32,
-            color.g as f32,
-            color.b as f32,
-            color.a as f32,
-        ];
-        self.device
-            .raw
-            .cmd_set_blend_constants(self.active, &vk_constants);
+    unsafe fn set_blend_constants(&mut self, color: &[f32; 4]) {
+        self.device.raw.cmd_set_blend_constants(self.active, color);
     }
 
     unsafe fn draw(