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This parameter is intended to indicate the optimal granularity for the render area. For TBDR GPUs, this will be the tile size. IMR GPUs continue to use 1x1. Apple GPUs support tile sizes of 16x16, 32x16, and 32x32. But, we can't read the tile size used for a Metal render pass until a render command encoder has been created. So for now, hardcode 32x32 for TBDR GPUs.