* clippy --fix
* elide lifetimes
* fmt and more fixes
* disable clippy::needless_borrowed_reference as it clashes with clippy::pattern_type_mismatch
* missed flags for target=wasm32-unknown-unknown
* Make the color attachments `Option`-al in render pipelines, render passes, and render bundles
* vk: `Option`-al color attachments support
* dx12: sparse color_attachments support
* Only non-hole attachments is supported on wasm target and gl backend
* deno_webgpu: `Option`-al color attachments support
* Follow all suggestions
Refactor `wgpu_core::command::bundle::State` to more closely resemble
the internal slots of a WebGPU `GPURenderBundleEncoder`, and add
validation required by the WebGPU specification.
Use `Option` to represent state that may be left unset on the encoder:
specifically, the pipeline and vertex buffers. (Previous commits have
already addressed index buffers and bind groups.) Use `.ok_or`, etc.
for unwrapping, to ensure that encoding state errors are reported.
Consolidate state derived from the pipeline in a new `PipelineState`
struct.
Remove `wgpu_core::command::bundle::PushConstantState::is_dirty`; just
represent push constant state as a vector of `PushConstantRange`
values. It's sufficient to simply zero the push constants whenever the
vector is non-empty.
Rename `bundle::State::flush_push_constants` to `zero_push_constants`a.
This is not a "flush pending state changes" function like all the
others; it just ensures that each pipeline's push constant state is
initialized.
This is used in various places around render pipelines, passes, and
bundles.
The public `wgpu_core::pipeline::VertexBufferLayout` could use
`VertexStep` as well, but I think it's best to let that continue to
resemble `GPUVertexBufferLayout`.
* Remove unused field `bundle::IndexState::pipeline_format`.
* Clean up render bundle index buffer tracking.
Put all state associated with an established index buffer within an
`Option`, so that the Rust types accurately represent value liveness.
Generate `MissingIndexBuffer` errors as needed for `DrawIndexed` and
indexed `MultiDrawIndirect` commands.
`wgpu_core::command::bundle::State::set_pipeline` marks a vertex
buffer slot dirty if the pipeline's stride or step mode for that
vertex buffer slot differs from what had been previously established.
The effect of marking the slot dirty is to ensure that a new
`SetVertexBuffer` command is inserted before the next draw command
that uses that vertex buffer. However, this is unnecessary:
`wgpu_hal::CommandEncoder::set_vertex_buffer` does not need to be
called simply because the stride or rate has changed.
Put some plumbing in place to accomodate the latest definition of
`GPURenderBundleEncoderDescriptor` in the WebGPU spec, which now has
separate `depthReadOnly` and `stencilReadOnly` members.
Rename `RenderPassDepthStencilAttachment::is_read_only` to
`depth_stencil_read_only`, and don't skip validation steps due to
early returns.
