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util: split to_flat_coord() and from_flat_coord() out of coord_offset()

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This commit is contained in:
Matthias Schiffer 2023-08-13 21:51:12 +02:00
parent 4a824680a9
commit d5ac38ed9b
Signed by: neocturne
GPG key ID: 16EF3F64CB201D9C
1 changed files with 18 additions and 5 deletions
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23
src/util.rs
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@ -27,6 +27,23 @@ impl ShiftMask for i32 {
}
}
#[inline]
pub fn to_flat_coord<const AXIS: u8>(
region: i8,
chunk: ChunkCoord<AXIS>,
block: BlockCoord<AXIS>,
) -> i32 {
(region as i32) << (BLOCK_BITS + CHUNK_BITS) | ((chunk.0 as i32) << BLOCK_BITS | block.0 as i32)
}
#[inline]
pub fn from_flat_coord<const AXIS: u8>(coord: i32) -> (i8, ChunkCoord<AXIS>, BlockCoord<AXIS>) {
let (region_chunk, block) = coord.shift_mask(BLOCK_BITS);
let (region, chunk) = region_chunk.shift_mask(CHUNK_BITS);
debug_assert!(i8::try_from(region).is_ok());
(region as i8, ChunkCoord::new(chunk), BlockCoord::new(block))
}
/// Offsets a chunk and block coordinate pair by a number of blocks
///
/// As the new coordinate may end up in a different region, a region offset
@ -37,11 +54,7 @@ pub fn coord_offset<const AXIS: u8>(
block: BlockCoord<AXIS>,
offset: i32,
) -> (i8, ChunkCoord<AXIS>, BlockCoord<AXIS>) {
let coord = ((chunk.0 as i32) << BLOCK_BITS | block.0 as i32) + offset;
let (region_chunk, block) = coord.shift_mask(BLOCK_BITS);
let (region, chunk) = region_chunk.shift_mask(CHUNK_BITS);
debug_assert!(i8::try_from(region).is_ok());
(region as i8, ChunkCoord::new(chunk), BlockCoord::new(block))
from_flat_coord(to_flat_coord(0, chunk, block) + offset)
}
#[cfg(test)]