"1D polar vectors" are a weird concept to wrap your head around,
especially if their constructor function takes a sine or cosine ratio
instead of an angle. This function is way closer to the polar_*()
family, which has these convenient `_x` and _y` suffixes that we could
just remove for this generic function to fit into there.
Part of P0244, funded by Blue Bolt and [Anonymous].
Reason: Too much micro-optimization using 32-bit registers, which
aren't supported by Turbo C++'s inline assembler. It's also just
another variation on a common function we've decompiled time and time
again.
Part of P0192, funded by [Anonymous], nrook, and -Tom-.
Almost undecompilable, until you remember that you can inhibit the
optimization of keeping a function parameter in a register by having an
`inline` function take a reference. Yet another function that wouldn't
have decompiled that nicely if we had restricted us to C…
Part of P0136, funded by [Anonymous].
With all the memmove()-style shifting of individual lines, there's
probably a point to reserving 20 lines per set, but only ever rendering
4 of them. We'll see once I get to decompile all of these functions.
Part of P0110, funded by [Anonymous] and Blue Bolt.
nmlgc