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Add comment about how silly the implementation of gba_offset is

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Gwilym Kuiper 2022-05-03 23:43:08 +01:00
parent 2853d34b30
commit 3b9909ad5b
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agb/src/display/tiled/mod.rs
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@ -53,6 +53,8 @@ impl RegularBackgroundSize {
self.num_tiles() / (32 * 32) self.num_tiles() / (32 * 32)
} }
// This is hilariously complicated due to how the GBA stores the background screenblocks.
// See https://www.coranac.com/tonc/text/regbg.htm#sec-map for an explanation
pub(crate) fn gba_offset(&self, pos: Vector2D<u16>) -> usize { pub(crate) fn gba_offset(&self, pos: Vector2D<u16>) -> usize {
let x_mod = pos.x & (self.width() as u16 - 1); let x_mod = pos.x & (self.width() as u16 - 1);
let y_mod = pos.y & (self.height() as u16 - 1); let y_mod = pos.y & (self.height() as u16 - 1);