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This change uses the VDP buffer system as storage for controlling data used to produce 3D graphics via the Pingo library. The only bitmap format supported is the 4-bytes-per-pixel format, because that's what Pingo uses. Also, most computations on the VDP end are done using floating-point, so parameters such as positions and angles must be scaled in order to be sent to the VDP via VDU commands. The VDP subsequently converts them back into floating-point values.