An implementation of the earcut polygon triangulation algorithm. The code is a port of [link:https://github.com/mapbox/earcut mapbox/earcut].
data -- A flat array of vertex coordinates.
holeIndices -- An array of hole indices if any.
dim -- The number of coordinates per vertex in the input array.
Triangulates the given shape definition by returning an array of triangles. A triangle is defined by three consecutive integers representing vertex indices.