uh, exactly why would anybody need more than 24 bits for display? high bit depths are I think useful for heavy dynamic-range-manipulation image editing. But with the standard contrast ratio, I don't think you need 30 bits. Assuming it's all integer data, then the curve will be much darker than normal in order to spend more of the bits on the darkness which can't be captured by normal RGB. And normal RGB has to be converted using the curve. Or else, most of the curve is wasted on light colors which are already distinguishable.
And exactly why the fsck would anyone need 30 bits for GBA games?
And exactly why the fsck would anyone need 30 bits for GBA games?