Target Use Case

Currently, in PathStyleExtension, when the highPrecisionDash option is set to false (which is the default), the instanceDashOffsets vertex attribute remains constant at 0. In this case, the attribute is effectively unused and could be removed.

Avoiding this extra attribute would help prevent hitting the WebGL limit of 16 vertex attributes. At the moment, the PathLayer uses 13 attributes, and PathStyleExtension adds 2 more. This makes it difficult to use additional extensions without exceeding the limit.

Proposal

The proposal is to conditionally define and use instanceDashOffsets only when highPrecisionDash is enabled.

This could be implemented using a #define HIGH_PRECISION_DASH, similar to how DataFilterExtension conditionally enables its additional attributes.