modules/voronoi: split voronoi_calculate_distances()

Preparatory commit for doing the voronoi distance calculations in
parallel when possible, as part of render_fragment() instead of
all in prepare_frame().

Not all of the distance calculation work can easily be threaded,
but it should be possible to compute the post-seed distances
concurrently within the spatial bounds of the tiled fragment.

This commit doesn't actually change anything functionally, as
it's just splitting the old voronoi_calculate_distances() into
two and calling them both in succession still from
voronoi_prepare_frame().

Subsequent commits will work towards making the render_pass()
fragment-aware then ultimately moved to voronoi_render_fragment()

0 files changed, 0 insertions, 0 deletions