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#![deny(missing_docs)]
#[macro_use]
extern crate mopa;
extern crate pulse;
extern crate threadpool;
extern crate fnv;
use std::cell::RefCell;
use std::sync::Arc;
use pulse::{Pulse, Signal, Barrier, Signals};
use threadpool::ThreadPool;
pub use storage::{Storage, StorageBase, VecStorage, HashMapStorage};
pub use world::{Component, World, FetchArg,
EntityBuilder, EntityIter, CreateEntityIter, DynamicEntityIter};
mod storage;
mod world;
pub type Generation = i32;
pub type Index = u32;
#[derive(Clone, Copy, Debug, Hash, Eq, Ord, PartialEq, PartialOrd)]
pub struct Entity(Index, Generation);
impl Entity {
#[cfg(test)]
pub fn new(index: u32, gen: i32) -> Entity {
Entity(index, gen)
}
pub fn get_id(&self) -> usize { self.0 as usize }
pub fn get_gen(&self) -> Generation { self.1 }
}
pub struct RunArg {
world: Arc<World>,
pulse: RefCell<Option<Pulse>>,
}
impl RunArg {
pub fn fetch<'a, U, F>(&'a self, f: F) -> U
where F: FnOnce(FetchArg<'a>) -> U
{
let pulse = self.pulse.borrow_mut().take()
.expect("fetch may only be called once.");
let u = f(FetchArg::new(&self.world));
pulse.pulse();
u
}
pub fn create(&self) -> Entity {
self.world.create_later()
}
pub fn delete(&self, entity: Entity) {
self.world.delete_later(entity)
}
pub fn new_entities(&self) -> DynamicEntityIter {
self.world.dynamic_entities()
}
}
pub struct Planner {
pub world: Arc<World>,
threads: ThreadPool,
pending: Vec<Signal>
}
impl Planner {
pub fn new(world: World, num_threads: usize) -> Planner {
Planner {
world: Arc::new(world),
threads: ThreadPool::new(num_threads),
pending: vec![]
}
}
pub fn run<F>(&mut self, functor: F) where
F: 'static + Send + FnOnce(RunArg)
{
let (signal, pulse) = Signal::new();
let (signal_done, pulse_done) = Signal::new();
let world = self.world.clone();
self.threads.execute(|| {
functor(RunArg {
world: world,
pulse: RefCell::new(Some(pulse)),
});
pulse_done.pulse();
});
if signal.wait().is_err() {
panic!("task panicked before args were captured.")
}
self.pending.push(signal_done);
}
pub fn wait(&mut self) {
Barrier::new(&self.pending[..]).wait().unwrap();
for signal in self.pending.drain(..) {
if signal.wait().is_err() {
panic!("one or more task as panicked.")
}
}
self.pending.clear();
self.world.merge();
}
}
macro_rules! impl_run {
($name:ident [$( $write:ident ),*] [$( $read:ident ),*]) => (impl Planner {
#[allow(missing_docs, non_snake_case, unused_mut)]
pub fn $name<
$($write:Component,)* $($read:Component,)*
F: 'static + Send + FnMut( $(&mut $write,)* $(&$read,)* )
>(&mut self, functor: F) {
self.run(|run| {
let mut fun = functor;
let ($(mut $write,)* $($read,)* entities) = run.fetch(|w|
($(w.write::<$write>(),)*
$(w.read::<$read>(),)*
w.entities())
);
for ent in entities {
if let ( $( Some($write), )* $( Some($read), )* ) =
( $( $write.get_mut(ent), )* $( $read.get(ent), )* ) {
fun( $($write,)* $($read,)* );
}
}
for ent in run.new_entities() {
if let ( $( Some($write), )* $( Some($read), )* ) =
( $( $write.get_mut(ent), )* $( $read.get(ent), )* ) {
fun( $($write,)* $($read,)* );
}
}
});
}
})
}
impl_run!( run0w1r [] [R0] );
impl_run!( run0w2r [] [R0, R1] );
impl_run!( run1w0r [W0] [] );
impl_run!( run1w1r [W0] [R0] );
impl_run!( run1w2r [W0] [R0, R1] );
impl_run!( run1w3r [W0] [R0, R1, R2] );
impl_run!( run1w4r [W0] [R0, R1, R2, R3] );
impl_run!( run1w5r [W0] [R0, R1, R2, R3, R4] );
impl_run!( run1w6r [W0] [R0, R1, R2, R3, R4, R5] );
impl_run!( run1w7r [W0] [R0, R1, R2, R3, R5, R6, R7] );
impl_run!( run2w0r [W0, W1] [] );
impl_run!( run2w1r [W0, W1] [R0] );
impl_run!( run2w2r [W0, W1] [R0, R1] );