Allow partial expression evaluation on the CPU #15415
Open
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This PR adds support for evaluation expressions on the CPU with an incomplete context (e.g. no feature, no resolution, etc.). An
UNKNOWN_VALUE
constant is introduced; it will be returned whenever an expression evaluates to something that is not defined, for instance trying to read a property if no feature properties have been provided in the context.This will be instrumental in preprocessing some parts of a style object for WebGL rendering (e.g. filters, string operations).
Rebased on #15414
Part of #15413
Note: this PR also improves the webgl fill/line pattern tests which were quite flakey