Merge #613

613: Add more context to errors originating in Passes and Encoders r=kvark a=Kimundi

**Description**
This adds some top-level error context information to indicate wether an error originated in a `{Render,Compute}Pass` or `{Command,RenderBundle}Encoder` to make error messages more clear.

Combined with gfx-rs/wgpu#1018, errors in passes will look like this:
```
wgpu error: Validation error

Caused by:
    In a RenderPass
    In a draw command
    index 3600 extends beyond limit 38
```


Co-authored-by: Marvin Löbel <[email protected]>

src/backend/direct.rs

@@ -1373,6 +1373,7 @@ impl crate::Context for Context {
         wgc::gfx_select!(
             encoder.id => global.command_encoder_run_compute_pass(encoder.id, pass)
         )
+        .map_err(|err| err.with_context("In a ComputePass".to_string()))
         .unwrap_error_sink(&encoder.error_sink, || ())
     }
 
@@ -1416,13 +1417,15 @@ impl crate::Context for Context {
     ) {
         let global = &self.0;
         wgc::gfx_select!(encoder.id => global.command_encoder_run_render_pass(encoder.id, pass))
+            .map_err(|err| err.with_context("In a RenderPass".to_string()))
             .unwrap_error_sink(&encoder.error_sink, || ())
     }
 
     fn command_encoder_finish(&self, encoder: &Self::CommandEncoderId) -> Self::CommandBufferId {
         let desc = wgt::CommandBufferDescriptor::default();
         let global = &self.0;
         wgc::gfx_select!(encoder.id => global.command_encoder_finish(encoder.id, &desc))
+            .map_err(|err| err.with_context("In a CommandEncoder".to_string()))
             .unwrap_error_sink(
                 &encoder.error_sink,
                 || wgc::gfx_select!( encoder.id => global.command_buffer_error(PhantomData)),
@@ -1432,8 +1435,8 @@ impl crate::Context for Context {
     fn command_encoder_insert_debug_marker(&self, encoder: &Self::CommandEncoderId, label: &str) {
         let global = &self.0;
         wgc::gfx_select!(encoder.id => global.command_encoder_insert_debug_marker(encoder.id, &label))
-                                   .map_err(|err| err.with_context("In CommandEncoder::insert_debug_marker".to_string()))
-        .unwrap_error_sink(&encoder.error_sink, ||())
+            .map_err(|err| err.with_context("In CommandEncoder::insert_debug_marker".to_string()))
+            .unwrap_error_sink(&encoder.error_sink, ||())
     }
     fn command_encoder_push_debug_group(&self, encoder: &Self::CommandEncoderId, label: &str) {
         let global = &self.0;
@@ -1461,6 +1464,7 @@ impl crate::Context for Context {
             },
             PhantomData
         ))
+        .map_err(|err| err.with_context("In a RenderBundleEncoder".to_string()))
         .unwrap_pretty()
     }