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Copy pathblocks.rs
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172 lines (142 loc) · 4.92 KB
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use blocks::BlockId;
use crate::ChunkSection;
use super::{
PackedArray, Palette, GLOBAL_BITS_PER_BLOCK, MAX_BITS_PER_BLOCK, MIN_BITS_PER_BLOCK,
SECTION_VOLUME,
};
/// Stores the blocks of a chunk section.
#[derive(Debug, Clone)]
pub struct BlockStore {
/// `None` if using the global palette
palette: Option<Palette>,
/// Stores indices into `palette`, or just block IDs
/// if using the global palette
blocks: PackedArray,
air_block_count: u32,
}
impl Default for BlockStore {
fn default() -> Self {
Self::new()
}
}
impl BlockStore {
/// Creates a new `BlockStore` containing air.
pub fn new() -> Self {
Self {
palette: Some(Palette::new()),
blocks: PackedArray::new(SECTION_VOLUME, MIN_BITS_PER_BLOCK as usize),
air_block_count: SECTION_VOLUME as u32,
}
}
/// Creates a new `BlockStore` from the palette
/// and data array.
pub fn from_raw_parts(palette: Option<Palette>, blocks: PackedArray) -> Self {
let air_block_count = Self::count_air_blocks(&blocks, &palette);
Self {
palette,
blocks,
air_block_count,
}
}
pub fn data(&self) -> &PackedArray {
&self.blocks
}
pub fn data_mut(&mut self) -> &mut PackedArray {
&mut self.blocks
}
pub fn palette(&self) -> Option<&Palette> {
self.palette.as_ref()
}
pub fn palette_mut(&mut self) -> Option<&mut Palette> {
self.palette.as_mut()
}
fn count_air_blocks(blocks: &PackedArray, palette: &Option<Palette>) -> u32 {
let mut count = 0;
blocks.iter().for_each(|x| {
let block = match palette {
Some(p) => p.get(x as usize),
None => BlockId::from_vanilla_id(x as u16),
};
if block.is_air() {
count += 1;
}
});
count
}
pub fn air_blocks(&self) -> u32 {
self.air_block_count
}
pub fn set_air_blocks(&mut self, new_value: u32) {
self.air_block_count = new_value;
}
pub fn block_at(&self, x: usize, y: usize, z: usize) -> Option<BlockId> {
let index = ChunkSection::block_index(x, y, z)?;
let block_index = self.blocks.get(index).expect("block_index out of bounds?");
Some(match &self.palette {
Some(palette) => palette.get(block_index as usize),
None => BlockId::from_vanilla_id(block_index as u16),
})
}
pub fn set_block_at(&mut self, x: usize, y: usize, z: usize, block: BlockId) -> Option<()> {
let index = ChunkSection::block_index(x, y, z)?;
self.update_air_block_count(x, y, z, block);
let block_index = self.get_block_palette_index(block);
self.blocks.set(index, block_index as u64);
Some(())
}
pub fn fill(&mut self, block: BlockId) {
let index = if let Some(ref mut palette) = self.palette {
palette.clear();
palette.index_or_insert(block)
} else {
self.palette = Some(Palette::new());
self.palette.as_mut().unwrap().index_or_insert(block)
};
self.blocks.fill(index as u64);
if block.is_air() {
self.air_block_count = SECTION_VOLUME as u32;
} else {
self.air_block_count = 0;
}
}
fn get_block_palette_index(&mut self, block: BlockId) -> usize {
match &mut self.palette {
Some(p) => {
let index = p.index_or_insert(block);
self.resize_if_needed();
index
}
None => block.vanilla_id() as usize,
}
}
fn resize_if_needed(&mut self) {
let palette = self.palette.as_ref().unwrap();
if palette.len() - 1 > self.blocks.max_value() as usize {
// Resize to either the global palette or a new section palette size.
let new_size = self.blocks.bits_per_value() + 1;
if new_size > MAX_BITS_PER_BLOCK as usize {
self.use_global_palette();
} else {
self.blocks = self.blocks.resized(new_size);
}
}
}
fn use_global_palette(&mut self) {
self.blocks = self.blocks.resized(GLOBAL_BITS_PER_BLOCK as usize);
let palette = self.palette.as_ref().unwrap();
// Update blocks to use vanilla IDs instead of palette indices
for i in 0..SECTION_VOLUME {
let block = palette.get(self.blocks.get(i).unwrap() as usize);
self.blocks.set(i, block.vanilla_id() as u64);
}
self.palette = None;
}
fn update_air_block_count(&mut self, x: usize, y: usize, z: usize, new: BlockId) {
let old = self.block_at(x, y, z).unwrap();
if old.is_air() && !new.is_air() {
self.air_block_count -= 1;
} else if !old.is_air() && new.is_air() {
self.air_block_count += 1;
}
}
}