wgsl: Migrate AF 'fract' to use look up table

zoddicus commented 5 months ago

This updates the fract tests to be compliant with a recent change to the spec, https://github.com/gpuweb/gpuweb/pull/4541.

This also includes some refactoring of the existing generation code for better reuse, removing some spurious zeros in the output, and avoiding potentially ambigious fractional values, by changing them to hex values.

Fixes https://github.com/gpuweb/cts/issues/3672

Requirements for PR author:

[ ] All missing test coverage is tracked with "TODO" or .unimplemented().
[ ] New helpers are /** documented */ and new helper files are found in helper_index.txt.
[ ] Test behaves as expected in a WebGPU implementation. (If not passing, explain above.)
[ ] Test have be tested with compatibility mode validation enabled and behave as expected. (If not passing, explain above.)

Requirements for reviewer sign-off:

[ ] Tests are properly located in the test tree.
[ ] Test descriptions allow a reader to "read only the test plans and evaluate coverage completeness", and accurately reflect the test code.
[ ] Tests provide complete coverage (including validation control cases). Missing coverage MUST be covered by TODOs.
[ ] Helpers and types promote readability and maintainability.

When landing this PR, be sure to make any necessary issue status updates.

zoddicus commented 5 months ago

Depends on the AF subtraction PR, so the new code is in https://github.com/gpuweb/cts/pull/3684/commits/1e7027b49a5360bffd597d26b6dc647eb719e7e8

zoddicus commented 5 months ago

@dneto0 Can I get a review on the dependeny PR, https://github.com/gpuweb/cts/pull/3667

zoddicus commented 5 months ago

@dneto0 Can I get a review on the dependeny PR, #3667

Dan reviewed

gpuweb / cts

wgsl: Migrate AF 'fract' to use look up table #3684