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//! Implements the main render loop
//!
//! This is not a final design
use crate::camera::film::FilmTile;
use crate::camera::Camera;
use crate::scene::Scene;
use crate::trace::Tracer;
use crate::sample::Sampler;
use crate::core::{Vector2f, Spectrum};
use crate::Float;
pub struct RenderTask {
pub tile: Box<FilmTile>,
samples: u32,
}
pub struct RenderContext<'a> {
pub scn: &'a Scene,
pub cam: &'a Camera,
pub trc: &'a Tracer,
}
impl RenderTask {
pub fn new(tile: Box<FilmTile>, samples: u32) -> Self {
Self { tile, samples }
}
fn render_at(&mut self, ctx: &RenderContext, x: i32, y: i32, sampler: &mut dyn Sampler) {
let corner = Vector2f::new_xy(x as Float, y as Float);
for _ in 0..self.samples {
let p = corner + sampler.get_sample_2d();
// Create a ray
let (r, _) = ctx.cam.generate_ray(&p);
self.tile.add_sample(&p, ctx.trc.trace(ctx.scn, &r));
}
}
pub fn render(&mut self, ctx: &RenderContext, sampler: &mut dyn Sampler) {
let b = self.tile.bounds.clone();
for y in b.min.y .. b.max.y {
for x in b.min.x .. b.max.x {
self.render_at(ctx, x, y, sampler);
}
}
}
}
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