Use software's BSP node traversal in OpenGL

I'm honestly surprised how this has gone unnoticed for this long. Turns out software has had an optimization in it's BSP tree traversal that avoids unnecessary recursion for quite a while, but it was never implemented in OpenGL, so I'm doing it now. I haven't done any performance tests, though, since I assume that whoever made the optimization in the software renderer already has.

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I assume that whoever made the optimization in the software renderer already has.

You mean, John Carmack when making the Id Tech 1? Yeah sure, he's a mastermind doing it, that's the person who made the optimization xdxd

Nope. The original doom used what OpenGL uses now. Someone else changed the software renderer to something more efficient.

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mentioned in commit a2aaa45d