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|
//! Split a image into small tiles
//!
//! This enables multithreaded rendering.
use super::{RenderTask, RenderContext};
use crate::camera::Film;
use crate::core::{Bound2i, Vector2i};
use crate::sample::Sampler;
use std::sync::{Mutex};
struct Tiler {
tilesize: Vector2i,
fullbound: Bound2i,
tilemap_size: Vector2i,
tilemap_area: i32,
next_tile: i32,
tiles_done: i32,
}
pub struct RenderCoord<'a> {
film: Mutex<&'a mut Film>,
samples: u32,
tiler: Mutex<Tiler>,
}
impl Tiler {
pub fn new(fullsize: Vector2i, tilesize: Vector2i) -> Tiler {
assert!(tilesize.x != 0 && tilesize.y != 0);
let tilemap_size = fullsize / tilesize;
Self {
tilesize,
fullbound: Bound2i::new(&Vector2i::ZERO, &fullsize),
tilemap_size,
tilemap_area: (tilemap_size.x * tilemap_size.y),
next_tile: 0,
tiles_done: 0,
}
}
pub fn next_tile(&mut self) -> Option<(Bound2i, i32)> {
// Check if we are outside
if self.next_tile >= self.tilemap_area {
return None;
}
// Convert the tile to xy in tilemap
let tile = Vector2i::new_xy(self.next_tile % self.tilemap_size.x, self.next_tile / self.tilemap_size.x);
let tile_index = self.next_tile;
self.next_tile += 1;
// Create a bound from the tilecoordinate
let tile_start = tile * self.tilesize;
// We need to make sure the resulting tile is inside the image bound
Some((
Bound2i::new(&tile_start, &(tile_start + self.tilesize)).intersect(&self.fullbound),
tile_index,
))
}
/// Mark a index as done and return the overall process
pub fn mark_done(&mut self, _index: i32) -> f32 {
self.tiles_done += 1;
println!("Progress: {}/{}", self.tiles_done, self.tilemap_area);
self.tiles_done as f32 / self.tilemap_area as f32
}
}
impl<'a> RenderCoord<'a> {
pub fn new(film: &'a mut Film, tilesize: Vector2i, samples: u32) -> Self {
let size = film.size;
Self {
film: Mutex::new(film),
samples,
tiler: Mutex::new(Tiler::new(size, tilesize)),
}
}
pub fn next_task(&self) -> Option<RenderTask> {
let (tile_bound, index) = self.tiler.lock().unwrap().next_tile()?;
let film_tile = {
let film = self.film.lock().unwrap();
Box::new(film.get_tile(&tile_bound))
};
Some(RenderTask::new(film_tile, self.samples, index))
}
pub fn finish_task(&self, task: &RenderTask) {
{
let mut film = self.film.lock().unwrap();
film.commit_tile(task.tile.as_ref());
}
self.tiler.lock().unwrap().mark_done(task.tile_index);
}
pub fn work(&self, ctx: &RenderContext, sampler: &mut dyn Sampler) {
while let Some(mut task) = self.next_task() {
task.render(ctx, sampler);
self.finish_task(&task);
}
}
pub fn run_threaded(&self, ctx: &RenderContext, sampler: &mut (dyn Sampler + Send), threads: u32) {
crossbeam::scope(|scope| {
for _ in 0..threads {
let mut sampler = sampler.clone_and_seed();
scope.spawn(move |_| {
self.work(ctx, sampler.as_mut());
});
}
}).unwrap();
}
}
|
