fix: discard cmd. enc. buf. on wgpu_core::Global::command_encoder_drop

CHANGELOG.md

@@ -61,6 +61,14 @@ Bottom level categories:
         - `tan`
         - `tanh`
 
+## v0.19.3 (2024-03-01)
+
+### Bug Fixes
+
+#### General
+
+- Fix an issue where command encoders weren't properly freed if an error occurred during command encoding. By @ErichDonGubler in [#5251](https://github.com/gfx-rs/wgpu/pull/5251).
+
 ## v0.19.2 (2024-02-29)
 
 ### Added/New Features

wgpu-core/src/command/mod.rs

@@ -78,7 +78,7 @@ impl<A: HalApi> CommandEncoder<A> {
         Ok(())
     }
 
-    fn discard(&mut self) {
+    pub(crate) fn discard(&mut self) {
         if self.is_open {
             self.is_open = false;
             unsafe { self.raw.discard_encoding() };
@@ -115,7 +115,7 @@ pub(crate) struct DestroyedBufferError(pub id::BufferId);
 pub(crate) struct DestroyedTextureError(pub id::TextureId);
 
 pub struct CommandBufferMutable<A: HalApi> {
-    encoder: CommandEncoder<A>,
+    pub(crate) encoder: CommandEncoder<A>,
     status: CommandEncoderStatus,
     pub(crate) trackers: Tracker<A>,
     buffer_memory_init_actions: Vec<BufferInitTrackerAction<A>>,

wgpu-core/src/device/global.rs

@@ -1354,6 +1354,8 @@ impl<G: GlobalIdentityHandlerFactory> Global<G> {
         let hub = A::hub(self);
 
         if let Some(cmd_buf) = hub.command_buffers.unregister(command_encoder_id) {
+            cmd_buf.data.lock().as_mut().unwrap().encoder.discard();
+
             cmd_buf
                 .device
                 .untrack(&cmd_buf.data.lock().as_ref().unwrap().trackers);