Always free staging buffers #2961
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This helps the borrow checker understand that we can borrow `pending_writes`'s encoder and the raw Device at the same time.
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cwfitzgerald
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We must ensure that the staging buffer is not leaked when an error occurs, so allocate it as late as possible, and free it explicitly when those fallible operations we can't move it past go awry. Fixes gfx-rs#2959.
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Checklist
cargo clippy.RUSTFLAGS=--cfg=web_sys_unstable_apis cargo clippy --target wasm32-unknown-unknownif applicable.Connections
Fixes #2959.
Description
Some platform validation requires that all resources created using a given Device must be freed before the Device itself. Some operations that use
StagingBuffers drop them on the ground if an error occurs.This patch ensures that the staging buffer is not leaked when an error occurs, by allocating it as late as possible, and freeing it explicitly when those fallible operations we can't move its allocation past go awry.
Testing
Tests included in
wgpu/tests.