An version of clang is smarter about generating warnings for template code. `assert` here is not included, so clang generates: `error: use of undeclared identifier 'assert'`
computeLightTree() takes a list of light as
a bitfield and produces a depth-first
binary tree array that can be used to efficiently
check which lights volumes contain a given z
coordinate in screen space.
Currently computeLightTree() produces the array
locally on the stack, which isn’t useful, but
before we can make use of it, a lot of other
things have to happen.