Noratrieb/game-wip-dontplay
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Eliminate negative coordinates

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They were making coordinate calculations more difficult,
and probably slower due to having to special case negative coordinates
This commit is contained in:
crumblingstatue 2023-04-03 10:32:20 +02:00
parent 67b2098ffb
commit 2a2c8f721c
3 changed files with 9 additions and 53 deletions
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43
src/world.rs
View file

@ -62,11 +62,7 @@ impl TilePos {
}
fn chk_pos(tile: TilePosScalar) -> ChunkPosScalar {
if tile.is_negative() {
((tile + 1) / CHUNK_EXTENT as i32) as i16 - 1
} else {
(tile / CHUNK_EXTENT as i32) as i16
}
(tile / CHUNK_EXTENT as TilePosScalar) as i16
}
#[test]
@ -75,26 +71,15 @@ fn test_chk_pos() {
assert_eq!(chk_pos(1), 0);
assert_eq!(chk_pos(127), 0);
assert_eq!(chk_pos(128), 1);
assert_eq!(chk_pos(-1), -1);
assert_eq!(chk_pos(-2), -1);
assert_eq!(chk_pos(-127), -1);
assert_eq!(chk_pos(-128), -1);
assert_eq!(chk_pos(-129), -2);
}
fn chunk_local(global: TilePosScalar) -> ChunkLocalTilePosScalar {
let mut result = global % CHUNK_EXTENT as i32;
if result.is_negative() {
result += CHUNK_EXTENT as i32;
}
result as u8
(global % CHUNK_EXTENT as TilePosScalar) as ChunkLocalTilePosScalar
}
#[test]
fn test_chunk_local() {
assert_eq!(chunk_local(0), 0);
assert_eq!(chunk_local(-1), 127);
assert_eq!(chunk_local(-128), 0);
}
#[test]
@ -107,32 +92,10 @@ fn test_to_chunk_and_local() {
TilePos { x: 1, y: 1 }.to_chunk_and_local(),
(ChunkPos { x: 0, y: 0 }, ChunkLocalTilePos { x: 1, y: 1 })
);
assert_eq!(
TilePos { x: -1, y: -1 }.to_chunk_and_local(),
(
ChunkPos { x: -1, y: -1 },
ChunkLocalTilePos { x: 127, y: 127 }
)
);
assert_eq!(
TilePos { x: -127, y: -127 }.to_chunk_and_local(),
(ChunkPos { x: -1, y: -1 }, ChunkLocalTilePos { x: 1, y: 1 })
);
assert_eq!(
TilePos { x: -128, y: -128 }.to_chunk_and_local(),
(ChunkPos { x: -1, y: -1 }, ChunkLocalTilePos { x: 0, y: 0 })
);
assert_eq!(
TilePos { x: -129, y: -129 }.to_chunk_and_local(),
(
ChunkPos { x: -2, y: -2 },
ChunkLocalTilePos { x: 127, y: 127 }
)
);
}
// Need to support at least 4 million tiles long
pub type TilePosScalar = i32;
pub type TilePosScalar = u32;
const CHUNK_EXTENT: u16 = 128;
const CHUNK_N_TILES: usize = CHUNK_EXTENT as usize * CHUNK_EXTENT as usize;