Bugzilla

Depends on [`wgpu#2673`].

WebGPU requires `GPUBufferDescriptor` validation failure to:

1) generate an error on the Device timeline, and

2) mark the new buffer as invalid.

Satisfy 1) by moving most validation to the compositor process.

Requirement 2) is harder. `wgpu_core::Global::device_create_buffer`
already takes care of some validation for us, and marks the provided
buffer id invalid when there's a problem. However, there are certain
errors the spec requires us to detect which `device_create_buffer`
cannot even see, because they are caught by standard Rust validation
steps in the process of creating the `wgpu_types::BufferDescriptor`
that one would *pass to* that function. For example, if there are
bogus bits set in the `usage` property, we can't even construct a Rust
`BufferUsages` value from that to include in the `BufferDescriptor`
that we must pass to `device_create_buffer`.

This means that we need to do some validation ourselves, in the
process of constructing that `BufferDescriptor`, and use the
`Global::create_buffer_error` method added in [`wgpu#2673`] to mark
the new buffer as invalid.

[`wgpu#2673`]: https://github.com/gfx-rs/wgpu/pull/2673

Depends on D146767

Depends on [`wgpu#2673`].

WebGPU requires `GPUBufferDescriptor` validation failure to:

1) generate an error on the Device timeline, and

2) mark the new buffer as invalid.

Satisfy 1) by moving most validation to the compositor process.

Requirement 2) is harder. `wgpu_core::Global::device_create_buffer` already takes care of some validation for us, and marks the provided buffer id invalid when there's a problem. However, there are certain errors the spec requires us to detect which `device_create_buffer` cannot even see, because they are caught by standard Rust validation steps in the process of creating the `wgpu_types::BufferDescriptor` that one would *pass to* that function. For example, if there are bogus bits set in the `usage` property, we can't even construct a Rust `BufferUsages` value from that to include in the `BufferDescriptor` that we must pass to `device_create_buffer`.

This means that we need to do some validation ourselves, in the process of constructing that `BufferDescriptor`, and use the `Global::create_buffer_error` method added in [`wgpu#2673`] to mark the new buffer as invalid.

[`wgpu#2673`]: https://github.com/gfx-rs/wgpu/pull/2673

Depends on D146767