Objects of this tuple class can be passed as the indexes
slot of a non-instanced render-set
to instruct render
to assemble primitives from the active vertex-array
by using multiple consecutive slices of its elements.
|• ||The starts slot contains a uint-array of indexes into the array from which to start generating primitives.|
|• ||The counts slot contains a uint-array of corresponding counts of indexes to read from each specified start index.|