Fixed missing device feature in mipmap example (#3081)

CHANGELOG.md

@@ -56,6 +56,7 @@ Add the `"wgsl"` feature, to enable WGSL shaders in `wgpu-core` and `wgpu`. Enab
 #### General
 
 - Bother to free the `hal::Api::CommandBuffer` when a `wgpu_core::command::CommandEncoder` is dropped. By @jimblandy in [#3069](https://github.com/gfx-rs/wgpu/pull/3069).
+- Fixed the mipmap example by adding the missing WRITE_TIMESTAMP_INSIDE_PASSES feature. By @Olaroll in [#3081](https://github.com/gfx-rs/wgpu/pull/3081).
 
 ### Testing/Internal
 

wgpu/examples/mipmap/main.rs

@@ -200,7 +200,9 @@ impl Example {
 
 impl framework::Example for Example {
     fn optional_features() -> wgpu::Features {
-        wgpu::Features::TIMESTAMP_QUERY | wgpu::Features::PIPELINE_STATISTICS_QUERY
+        wgpu::Features::TIMESTAMP_QUERY
+            | wgpu::Features::PIPELINE_STATISTICS_QUERY
+            | wgpu::Features::WRITE_TIMESTAMP_INSIDE_PASSES
     }
 
     fn init(
@@ -323,10 +325,11 @@ impl framework::Example for Example {
         });
 
         // If both kinds of query are supported, use queries
-        let query_sets = if device
-            .features()
-            .contains(wgpu::Features::TIMESTAMP_QUERY | wgpu::Features::PIPELINE_STATISTICS_QUERY)
-        {
+        let query_sets = if device.features().contains(
+            wgpu::Features::TIMESTAMP_QUERY
+                | wgpu::Features::PIPELINE_STATISTICS_QUERY
+                | wgpu::Features::WRITE_TIMESTAMP_INSIDE_PASSES,
+        ) {
             // For N total mips, it takes N - 1 passes to generate them, and we're measuring those.
             let mip_passes = MIP_LEVEL_COUNT - 1;