This image was rendered in a single draw call from a shared VBO/IBO polygon pool. Right now it can hold 1M tiles in a 32MB VBO with a 24MB IBO. The index buffer is extra large since I have to use 32-bit indices, but it ends up being a huge performance win when the polygon pool is only partially full; unused polygons can be made explicitly degenerate by zeroing out the indices.
I may end up switching back to unindexed triangle soup in a 48MB VBO depending on performance. (or 32MB of unindexed quads, but quads are deprecated in newer GL releases) The goal will be to keep the polygon pool and virtual tile map full at all times, prioritizing exposed tiles closest to the player. Of course, none of that logic has been implemented yet, and the indexed-triangle solution is better for a scene like this where the buffers are only 22% full.
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