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Track the generation along with the tile data

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This commit is contained in:
Gwilym Kuiper 2022-02-07 20:39:05 +00:00
parent 7d870163c3
commit 666867e933
1 changed files with 6 additions and 4 deletions
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10
agb/src/display/background.rs
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@ -95,7 +95,7 @@ pub struct VRamManager<'a> {
generation: u16,
free_pointer: Option<usize>,
tile_set_to_vram: HashMap<TileReference, u16>,
tile_set_to_vram: HashMap<TileReference, (u16, u16)>,
references: Vec<VRamState>,
vram_free_pointer: Option<usize>,
}
@ -167,8 +167,10 @@ impl<'a> VRamManager<'a> {
fn add_tile(&mut self, tile_set_ref: TileSetReference, tile: u16) -> TileIndex {
let tile_ref = TileReference(tile_set_ref.id, tile);
if let Some(&reference) = self.tile_set_to_vram.get(&tile_ref) {
self.references[reference as usize].increase_reference();
return TileIndex(reference as u16);
if reference.1 == tile_set_ref.generation {
self.references[reference.0 as usize].increase_reference();
return TileIndex(reference.0 as u16);
}
}
let index_to_copy_into = if let Some(ptr) = self.vram_free_pointer.take() {
@ -211,7 +213,7 @@ impl<'a> VRamManager<'a> {
self.tile_set_to_vram.insert(
TileReference(tile_set_ref.id, tile),
index_to_copy_into as u16,
(index_to_copy_into as u16, tile_set_ref.generation),
);
TileIndex(index_to_copy_into as u16)