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use crate::ecs::{
pipeline::{PipelineEngine, PipelineGraph},
Universe,
};
#[derive(Debug, Default, Clone, PartialEq)]
pub struct DefaultPipelineEngine {
pub parallel: bool,
pub(crate) graph: Option<PipelineGraph>,
}
impl DefaultPipelineEngine {
pub fn with_parallel(mut self, mode: bool) -> Self {
self.parallel = mode;
self
}
fn run_node(node: &PipelineGraph, universe: &mut Universe) {
match node {
PipelineGraph::System(system) => (system.system)(universe),
PipelineGraph::Sequence(list) | PipelineGraph::Parallel(list) => {
for item in list {
Self::run_node(item, universe);
}
}
}
}
#[cfg(feature = "parallel")]
fn run_node_parallel(node: &PipelineGraph, universe: &Universe) {
#[allow(mutable_transmutes)]
match node {
PipelineGraph::System(system) =>
{
#[allow(clippy::transmute_ptr_to_ptr)]
(system.system)(unsafe { std::mem::transmute(universe) })
}
PipelineGraph::Sequence(list) => {
for item in list {
Self::run_node_parallel(item, universe);
}
}
PipelineGraph::Parallel(list) => {
if list.len() > 1 {
use rayon::prelude::*;
for item in list {
if item.is_lock_on_single_thread() {
#[allow(clippy::transmute_ptr_to_ptr)]
Self::run_node(item, unsafe { std::mem::transmute(universe) });
}
}
list.par_iter().for_each(|item| {
if !item.is_lock_on_single_thread() {
Self::run_node_parallel(item, universe)
}
});
} else {
let item = list.first().unwrap();
if item.is_lock_on_single_thread() {
#[allow(clippy::transmute_ptr_to_ptr)]
Self::run_node(item, unsafe { std::mem::transmute(universe) });
} else {
Self::run_node_parallel(item, universe);
}
}
}
}
}
}
impl PipelineEngine for DefaultPipelineEngine {
fn setup(&mut self, graph: PipelineGraph) {
self.graph = Some(graph);
}
fn run(&self, universe: &mut Universe) {
#[cfg(not(feature = "parallel"))]
{
if let Some(node) = &self.graph {
Self::run_node(node, universe);
}
}
#[cfg(feature = "parallel")]
{
if let Some(node) = &self.graph {
if self.parallel {
Self::run_node_parallel(node, universe);
} else {
Self::run_node(node, universe);
}
}
}
}
}