[Notes] Voxel VRAM usage with Geometry Shader

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Standard world (seeds 12345). Camera centered at (512, 80, 512), RENDER_DISTANCE=16 CHUNK_SIZE=32

No geometry shader: 82MB

With geometry shader: 20MB

With geometry shader + byte for data: 8MB

On the Radeon HD 6850, using integer data causes a huge drop in performance