366 lines
11 KiB
Rust
366 lines
11 KiB
Rust
use crate::model;
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use crate::render;
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use crate::resources;
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use crate::shared::Direction;
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use crate::types::bit::Set;
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use crate::world;
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use crate::world::block;
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use rand::{self, Rng, SeedableRng};
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use rand_pcg;
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use std::sync::mpsc;
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use std::sync::{Arc, RwLock};
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use std::thread;
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const NUM_WORKERS: usize = 8;
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pub struct ChunkBuilder {
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threads: Vec<(mpsc::Sender<BuildReq>, thread::JoinHandle<()>)>,
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free_builders: Vec<(usize, Vec<u8>, Vec<u8>)>,
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built_recv: mpsc::Receiver<(usize, BuildReply)>,
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models: Arc<RwLock<model::Factory>>,
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resource_version: usize,
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}
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impl ChunkBuilder {
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pub fn new(
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resources: Arc<RwLock<resources::Manager>>,
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textures: Arc<RwLock<render::TextureManager>>,
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) -> ChunkBuilder {
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let models = Arc::new(RwLock::new(model::Factory::new(
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resources.clone(),
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textures,
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)));
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let mut threads = vec![];
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let mut free = vec![];
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let (built_send, built_recv) = mpsc::channel();
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for i in 0..NUM_WORKERS {
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let built_send = built_send.clone();
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let (work_send, work_recv) = mpsc::channel();
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let models = models.clone();
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let id = i;
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threads.push((
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work_send,
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thread::spawn(move || build_func(id, models, work_recv, built_send)),
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));
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free.push((i, vec![], vec![]));
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}
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ChunkBuilder {
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threads,
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free_builders: free,
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built_recv,
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models,
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resource_version: 0xFFFF,
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}
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}
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pub fn tick(
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&mut self,
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world: &mut world::World,
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renderer: &mut render::Renderer,
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version: usize,
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) {
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{
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if version != self.resource_version {
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self.resource_version = version;
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self.models.write().unwrap().version_change();
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}
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}
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while let Ok((id, mut val)) = self.built_recv.try_recv() {
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world.reset_building_flag(val.position);
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if let Some(sec) = world.get_section_mut(val.position.0, val.position.1, val.position.2)
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{
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sec.cull_info = val.cull_info;
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renderer.update_chunk_solid(
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&mut sec.render_buffer,
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&val.solid_buffer,
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val.solid_count,
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);
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renderer.update_chunk_trans(
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&mut sec.render_buffer,
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&val.trans_buffer,
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val.trans_count,
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);
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}
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val.solid_buffer.clear();
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val.trans_buffer.clear();
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self.free_builders
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.push((id, val.solid_buffer, val.trans_buffer));
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}
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if self.free_builders.is_empty() {
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return;
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}
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let dirty_sections = world
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.get_render_list()
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.iter()
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.map(|v| v.0)
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.filter(|v| world.is_section_dirty(*v))
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.collect::<Vec<_>>();
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for (x, y, z) in dirty_sections {
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let t_id = self.free_builders.pop().unwrap();
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world.set_building_flag((x, y, z));
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let (cx, cy, cz) = (x << 4, y << 4, z << 4);
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let mut snapshot = world.capture_snapshot(cx - 2, cy - 2, cz - 2, 20, 20, 20);
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snapshot.make_relative(-2, -2, -2);
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self.threads[t_id.0]
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.0
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.send(BuildReq {
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snapshot,
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position: (x, y, z),
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solid_buffer: t_id.1,
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trans_buffer: t_id.2,
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})
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.unwrap();
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if self.free_builders.is_empty() {
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return;
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}
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}
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}
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}
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struct BuildReq {
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snapshot: world::Snapshot,
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position: (i32, i32, i32),
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solid_buffer: Vec<u8>,
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trans_buffer: Vec<u8>,
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}
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struct BuildReply {
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position: (i32, i32, i32),
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solid_buffer: Vec<u8>,
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solid_count: usize,
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trans_buffer: Vec<u8>,
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trans_count: usize,
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cull_info: CullInfo,
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}
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fn build_func(
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id: usize,
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models: Arc<RwLock<model::Factory>>,
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work_recv: mpsc::Receiver<BuildReq>,
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built_send: mpsc::Sender<(usize, BuildReply)>,
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) {
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loop {
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let BuildReq {
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snapshot,
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position,
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mut solid_buffer,
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mut trans_buffer,
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} = match work_recv.recv() {
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Ok(val) => val,
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Err(_) => return,
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};
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let mut rng = rand_pcg::Pcg32::from_seed([
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((position.0 as u32) & 0xff) as u8,
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(((position.0 as u32) >> 8) & 0xff) as u8,
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(((position.0 as u32) >> 16) & 0xff) as u8,
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((position.0 as u32) >> 24) as u8,
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((position.1 as u32) & 0xff) as u8,
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(((position.1 as u32) >> 8) & 0xff) as u8,
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(((position.1 as u32) >> 16) & 0xff) as u8,
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((position.1 as u32) >> 24) as u8,
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((position.2 as u32) & 0xff) as u8,
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(((position.2 as u32) >> 8) & 0xff) as u8,
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(((position.2 as u32) >> 16) & 0xff) as u8,
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((position.2 as u32) >> 24) as u8,
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(((position.0 as u32 ^ position.2 as u32) | 1) & 0xff) as u8,
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((((position.0 as u32 ^ position.2 as u32) | 1) >> 8) & 0xff) as u8,
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((((position.0 as u32 ^ position.2 as u32) | 1) >> 16) & 0xff) as u8,
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(((position.0 as u32 ^ position.2 as u32) | 1) >> 24) as u8,
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]);
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let mut solid_count = 0;
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let mut trans_count = 0;
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for y in 0..16 {
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for x in 0..16 {
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for z in 0..16 {
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let block = snapshot.get_block(x, y, z);
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let mat = block.get_material();
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if !mat.renderable {
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// Use one step of the rng so that
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// if a block is placed in an empty
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// location is variant doesn't change
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let _: u32 = rng.gen();
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continue;
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}
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match block {
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block::Block::Water { .. } | block::Block::FlowingWater { .. } => {
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let tex = models.read().unwrap().textures.clone();
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trans_count += model::liquid::render_liquid(
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tex,
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false,
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&snapshot,
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x,
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y,
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z,
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&mut trans_buffer,
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);
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continue;
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}
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block::Block::Lava { .. } | block::Block::FlowingLava { .. } => {
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let tex = models.read().unwrap().textures.clone();
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solid_count += model::liquid::render_liquid(
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tex,
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true,
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&snapshot,
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x,
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y,
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z,
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&mut solid_buffer,
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);
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continue;
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}
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_ => {}
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}
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if mat.transparent {
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trans_count += model::Factory::get_state_model(
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&models,
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block,
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&mut rng,
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&snapshot,
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x,
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y,
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z,
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&mut trans_buffer,
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);
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} else {
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solid_count += model::Factory::get_state_model(
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&models,
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block,
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&mut rng,
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&snapshot,
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x,
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y,
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z,
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&mut solid_buffer,
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);
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}
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}
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}
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}
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let cull_info = build_cull_info(&snapshot);
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built_send
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.send((
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id,
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BuildReply {
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position,
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solid_buffer,
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solid_count,
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trans_buffer,
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trans_count,
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cull_info,
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},
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))
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.unwrap();
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}
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}
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fn build_cull_info(snapshot: &world::Snapshot) -> CullInfo {
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let mut visited = Set::new(16 * 16 * 16);
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let mut info = CullInfo::new();
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for y in 0..16 {
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for z in 0..16 {
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for x in 0..16 {
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if visited.get(x | (z << 4) | (y << 8)) {
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continue;
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}
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let touched = flood_fill(snapshot, &mut visited, x as i32, y as i32, z as i32);
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if touched == 0 {
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continue;
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}
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for d1 in Direction::all() {
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if (touched & (1 << d1.index())) != 0 {
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for d2 in Direction::all() {
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if (touched & (1 << d2.index())) != 0 {
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info.set_visible(d1, d2);
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}
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}
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}
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}
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}
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}
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}
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info
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}
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fn flood_fill(snapshot: &world::Snapshot, visited: &mut Set, x: i32, y: i32, z: i32) -> u8 {
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use std::collections::VecDeque;
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let mut next_position = VecDeque::with_capacity(16 * 16);
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next_position.push_back((x, y, z));
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let mut touched = 0;
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while let Some((x, y, z)) = next_position.pop_front() {
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let idx = (x | (z << 4) | (y << 8)) as usize;
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if x < 0 || x > 15 || y < 0 || y > 15 || z < 0 || z > 15 || visited.get(idx) {
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continue;
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}
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visited.set(idx, true);
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if snapshot
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.get_block(x, y, z)
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.get_material()
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.should_cull_against
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{
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continue;
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}
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if x == 0 {
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touched |= 1 << Direction::West.index();
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} else if x == 15 {
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touched |= 1 << Direction::East.index();
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}
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if y == 0 {
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touched |= 1 << Direction::Down.index();
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} else if y == 15 {
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touched |= 1 << Direction::Up.index();
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}
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if z == 0 {
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touched |= 1 << Direction::North.index();
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} else if z == 15 {
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touched |= 1 << Direction::South.index();
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}
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for d in Direction::all() {
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let (ox, oy, oz) = d.get_offset();
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next_position.push_back((x + ox, y + oy, z + oz));
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}
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}
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touched
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}
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#[derive(Clone, Copy, Default)]
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pub struct CullInfo(u64);
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impl CullInfo {
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pub fn new() -> CullInfo {
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Default::default()
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}
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pub fn all_vis() -> CullInfo {
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CullInfo(0xFFFFFFFFFFFFFFFF)
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}
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pub fn is_visible(&self, from: Direction, to: Direction) -> bool {
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(self.0 & (1 << (from.index() * 6 + to.index()))) != 0
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}
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pub fn set_visible(&mut self, from: Direction, to: Direction) {
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self.0 |= 1 << (from.index() * 6 + to.index());
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}
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}
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