Fix pipeline statistics stride

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Change Log
 
+## wgpu-core-0.9.1 (2021-07-13)
+  - fix buffer inits delayed by a frame
+  - fix query resolves to initialize buffers
+  - fix pipeline statistics stride
+
 ## v0.9 (2021-06-18)
   - Updated:
     - naga to `v0.5`.

wgpu-core/src/command/query.rs

@@ -382,7 +382,11 @@ impl<G: GlobalIdentityHandlerFactory> Global<G> {
             .into());
         }
 
-        let stride = query_set.elements * wgt::QUERY_SIZE;
+        let elements_per_query = match query_set.desc.ty {
+            wgt::QueryType::PipelineStatistics(ps) => ps.bits().count_ones(),
+            wgt::QueryType::Timestamp => 1,
+        };
+        let stride = elements_per_query * wgt::QUERY_SIZE;
         let bytes_used = (stride * query_count) as BufferAddress;
 
         let buffer_start_offset = destination_offset;