c35176eadf
This CL strips the context object out of Tint. Change-Id: Id0dcb9c557b217c03a8d9ac08fc9fe1c799f3fdc Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/34742 Commit-Queue: dan sinclair <dsinclair@chromium.org> Reviewed-by: Ben Clayton <bclayton@google.com> Reviewed-by: Ryan Harrison <rharrison@chromium.org>
SPIR-V Reader
This component translates SPIR-V written for Vulkan into the Tint AST.
The SPIR-V reader entry point is tint::reader::spirv::Parser, which
implements the Reader interface in tint::reader::Reader.
It's usable from the Tint command line:
# Dump the Tint AST after reading SPIR-V.
tint --dump-ast --parse-only a.spv
# Translate SPIR-V into WGSL.
tint --format wgsl a.spv
Validation
The SPIR-V module must pass validation for the SPV_ENV_WEBGPU_0 target
environment in SPIRV-Tools.
That set of rules is experimental and was originally intended to constraint SPIR-V modules being ingested directly by the WebGPU API. Those rules are now too restrictive, because some amount of sanitization and normalization occurs during translation from SPIR-V to WGSL. The validation rules will be relaxed at some point TBD.
Generally, validation of functionality used will remain, e.g. WebGPU currently
does not support CullDistance or subgroup operations.
However, detailed rules about the form of SPIR-V can be relaxed, e.g. the requirement to use SPIR-V 1.3, and restrictive rules about statically unreachable code.
Feedback
Please file issues at https://crbug.com/tint, and put spirv-reader in the issue title.
Outstanding issues can be found by using the spirv-reader label in the Chromium project's
bug tracker: https://bugs.chromium.org/p/tint/issues/list?q=label:spirv-reader