mtl: Remove unnecessary `Vec::clear()`
I think that there's `resize()` already so we don't need to clear/truncate it first which brings some impact performance to iOS devices.
@@ -3192,7 +3192,6 @@ impl com::RawCommandBuffer<Backend> for CommandBuffer {
T::Item: Borrow<com::ClearValueRaw>,
{
// fill out temporary clear values per attachment
- self.temp.clear_values.clear();
self.temp
.clear_values
.resize(render_pass.attachments.len(), None);
