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Try using a vec of vecs rather than a hashmap

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This commit is contained in:
Gwilym Kuiper 2022-02-19 22:06:06 +00:00
parent ceb17a0186
commit aa7823232b
1 changed files with 19 additions and 14 deletions
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33
agb/src/display/tiled/vram_manager.rs
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@ -1,10 +1,5 @@
use alloc::vec::Vec;
use core::hash::BuildHasherDefault;
use hashbrown::HashMap;
use rustc_hash::FxHasher;
use alloc::vec;
use alloc::vec::Vec;
use crate::{
display::palette16,
@ -49,6 +44,10 @@ impl<'a> TileSet<'a> {
pub fn new(tiles: &'a [u32], format: TileFormat) -> Self {
Self { tiles, format }
}
fn num_tiles(&self) -> usize {
self.tiles.len() / self.format.tile_size() * 4
}
}
#[derive(Clone, Copy, PartialEq, Eq)]
@ -114,7 +113,7 @@ pub struct VRamManager<'a> {
generation: u16,
free_pointer: Option<usize>,
tile_set_to_vram: HashMap<TileReference, (u16, u16), BuildHasherDefault<FxHasher>>,
tile_set_to_vram: Vec<Vec<(u16, u16)>>,
references: Vec<VRamState>,
vram_free_pointer: Option<usize>,
}
@ -128,7 +127,7 @@ impl<'a> VRamManager<'a> {
generation: 0,
free_pointer: None,
tile_set_to_vram: HashMap::default(),
tile_set_to_vram: Default::default(),
references: vec![VRamState::Free(0)],
vram_free_pointer: None,
}
@ -138,6 +137,7 @@ impl<'a> VRamManager<'a> {
let generation = self.generation;
self.generation = self.generation.wrapping_add(1);
let num_tiles = tileset.num_tiles();
let tileset = ArenaStorageItem::Data(tileset, generation);
let index = if let Some(ptr) = self.free_pointer.take() {
@ -158,6 +158,10 @@ impl<'a> VRamManager<'a> {
self.tilesets.len() - 1
};
self.tile_set_to_vram
.resize(self.tilesets.len(), Default::default());
self.tile_set_to_vram[index] = vec![Default::default(); num_tiles];
TileSetReference::new(index as u16, generation)
}
@ -185,10 +189,13 @@ impl<'a> VRamManager<'a> {
pub(crate) 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) {
let reference = self.tile_set_to_vram[tile_set_ref.id as usize][tile as usize];
if reference != Default::default() {
if reference.1 == tile_set_ref.generation {
self.references[reference.0 as usize].increase_reference();
return TileIndex(reference.0 as u16);
} else {
panic!("Tileset unloaded but not cleared from vram");
}
}
@ -236,10 +243,8 @@ impl<'a> VRamManager<'a> {
);
}
self.tile_set_to_vram.insert(
TileReference(tile_set_ref.id, tile),
(index_to_copy_into as u16, tile_set_ref.generation),
);
self.tile_set_to_vram[tile_set_ref.id as usize][tile as usize] =
(index_to_copy_into as u16, tile_set_ref.generation);
TileIndex(index_to_copy_into as u16)
}
@ -259,7 +264,7 @@ impl<'a> VRamManager<'a> {
self.references[index] = VRamState::Free(END_OF_FREE_LIST_MARKER);
}
self.tile_set_to_vram.remove(&tile_ref);
self.tile_set_to_vram[tile_ref.0 as usize][tile_ref.1 as usize] = Default::default();
self.vram_free_pointer = Some(index);
}