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Use a concrete type for the TileReference

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This commit is contained in:
Gwilym Kuiper 2022-01-31 20:09:49 +00:00
parent 5793d6b6ab
commit cd05fee360
1 changed files with 12 additions and 8 deletions
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20
agb/src/display/background.rs
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@ -53,22 +53,24 @@ pub struct TileSetReference {
#[derive(Debug)]
pub struct TileIndex(u16);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
struct TileReference(u16, u16);
enum VRamState {
ReferenceCounted(u16, (u16, u16)),
ReferenceCounted(u16, TileReference),
Free(u16),
}
impl VRamState {
fn increase_reference(&mut self) -> u16 {
fn increase_reference(&mut self) {
if let VRamState::ReferenceCounted(count, _) = self {
*count += 1;
*count
} else {
panic!("Corrupted vram state");
}
}
fn decrease_reference(&mut self) -> (u16, (u16, u16)) {
fn decrease_reference(&mut self) -> (u16, TileReference) {
if let VRamState::ReferenceCounted(count, tile_ref) = self {
*count -= 1;
(*count, *tile_ref)
@ -89,7 +91,7 @@ pub struct VRamManager<'a> {
generation: u16,
free_pointer: Option<usize>,
tile_set_to_vram: HashMap<(u16, u16), u16>,
tile_set_to_vram: HashMap<TileReference, u16>,
references: Vec<VRamState>,
vram_free_pointer: Option<usize>,
}
@ -159,7 +161,7 @@ impl<'a> VRamManager<'a> {
}
fn add_tile(&mut self, tile_set_ref: TileSetReference, tile: u16) -> TileIndex {
let tile_ref = (tile_set_ref.id, tile);
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);
@ -203,8 +205,10 @@ impl<'a> VRamManager<'a> {
TILE_BACKGROUND.set(index_to_copy_into * tile_size_in_words + i, word);
}
self.tile_set_to_vram
.insert((tile_set_ref.id, tile), index_to_copy_into as u16);
self.tile_set_to_vram.insert(
TileReference(tile_set_ref.id, tile),
index_to_copy_into as u16,
);
TileIndex(index_to_copy_into as u16)
}