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|
use std::{borrow::Borrow, sync::RwLock, time::Duration};
use rayon::prelude::*;
use synchronoise::SignalEvent;
use crate::{
camera::Camera,
config::RenderData,
error::TracerError,
geometry::Hittable,
image::{Image, SubImage},
ray::Ray,
util::random_double,
vec3::{Color, Vec3},
};
fn ray_color(scene: &dyn Hittable, ray: &Ray, depth: usize) -> Vec3 {
if depth == 0 {
return Vec3::default();
}
if let Some(rec) = scene.hit(ray, 0.001, std::f64::INFINITY) {
if let Some((scattered, attenuation)) = rec.material.scatter(ray, &rec) {
return attenuation * ray_color(scene, &scattered, depth - 1);
}
return Color::default();
}
// Sky
let first_color = Vec3::new(1.0, 1.0, 1.0);
let second_color = Vec3::new(0.5, 0.7, 1.0);
let unit_direction = ray.direction().unit_vector();
let t = 0.5 * (unit_direction.y() + 1.0);
(1.0 - t) * first_color + t * second_color
}
pub fn raytrace_scaled(
buffer: &RwLock<Vec<u32>>,
cancel_event: Option<&SignalEvent>,
scene: &dyn Hittable,
camera: Camera,
image: &SubImage,
data: &RenderData,
scale: (usize, usize),
) -> Result<(), TracerError> {
let (scale_width, scale_height) = scale;
let scaled_width = image.width / scale_width;
let scaled_height = image.height / scale_height;
let mut colors: Vec<Vec3> = vec![Vec3::default(); scaled_height * scaled_width];
for row in 0..scaled_height {
for column in 0..scaled_width {
let u: f64 = ((image.x + column * scale_width) as f64 + random_double())
/ (image.screen_width - 1) as f64;
for _ in 0..data.samples {
let v: f64 = ((image.y + row * scale_height) as f64 + random_double())
/ (image.screen_height - 1) as f64;
colors[row * scaled_width + column].add(ray_color(
scene,
&camera.get_ray(u, v),
data.max_depth,
));
}
}
if do_cancel(cancel_event) {
return Ok(());
}
}
(!do_cancel(cancel_event))
.then_some(|| ())
.ok_or(TracerError::CancelEvent)
.and_then(|_| {
buffer
.write()
.map_err(|e| TracerError::FailedToAcquireLock(e.to_string()))
})
.map(|mut buf| {
let offset = image.y * image.screen_width + image.x;
for scaled_row in 0..scaled_height {
for scaled_col in 0..scaled_width {
let color = colors[scaled_row * scaled_width + scaled_col]
.scale_sqrt(data.samples)
.as_color();
let row = scaled_row * scale_height;
let col = scaled_col * scale_width;
for scale_h in 0..scale_height {
for scale_w in 0..scale_width {
buf[offset + (row + scale_h) * image.screen_width + col + scale_w] =
color;
}
}
}
}
})
}
pub fn raytrace(
buffer: &RwLock<Vec<u32>>,
cancel_event: Option<&SignalEvent>,
scene: &dyn Hittable,
camera: Camera,
image: &SubImage,
data: &RenderData,
) -> Result<(), TracerError> {
let mut colors: Vec<Vec3> = vec![Vec3::default(); image.height * image.width];
for row in 0..image.height {
for column in 0..image.width {
let u: f64 =
((image.x + column) as f64 + random_double()) / (image.screen_width - 1) as f64;
for _ in 0..data.samples {
let v: f64 =
((image.y + row) as f64 + random_double()) / (image.screen_height - 1) as f64;
colors[row * image.width + column].add(ray_color(
scene,
&camera.get_ray(u, v),
data.max_depth,
));
}
}
if do_cancel(cancel_event) {
return Ok(());
}
}
(!do_cancel(cancel_event))
.then_some(|| ())
.ok_or(TracerError::CancelEvent)
.and_then(|_| {
buffer
.write()
.map_err(|e| TracerError::FailedToAcquireLock(e.to_string()))
})
.map(|mut buf| {
let offset = image.y * image.screen_width + image.x;
for row in 0..image.height {
for col in 0..image.width {
let color = colors[row * image.width + col]
.scale_sqrt(data.samples)
.as_color();
buf[offset + row * image.screen_width + col] = color;
}
}
})
}
fn do_cancel(cancel_event: Option<&SignalEvent>) -> bool {
match cancel_event {
Some(event) => event.wait_timeout(Duration::from_secs(0)),
None => false,
}
}
fn get_highest_divdable(value: usize, mut div: usize) -> usize {
// Feels like there could possibly be some other nicer trick to this.
while (value % div) != 0 {
div -= 1;
}
div
}
pub fn render(
buffer: &RwLock<Vec<u32>>,
camera: &RwLock<Camera>,
image: &Image,
scene: &dyn Hittable,
data: &RenderData,
cancel_event: Option<&SignalEvent>,
scale: Option<usize>,
) -> Result<(), TracerError> {
if do_cancel(cancel_event) {
return Ok(());
}
let width_step = image.width / data.num_threads_width;
let height_step = image.height / data.num_threads_height;
let scaled_width = scale.map_or(1, |s| get_highest_divdable(width_step, s));
let scaled_height = scale.map_or(1, |s| get_highest_divdable(height_step, s));
(!do_cancel(cancel_event))
.then_some(|| ())
.ok_or(TracerError::CancelEvent)
.and_then(|_| {
camera
.read()
.map_err(|e| TracerError::FailedToAcquireLock(e.to_string()))
// We make a clone of it as it's not very important to
// have the latest camera angle etc. Better to keep
// the lock to a minimum.
.map(|cam| cam.clone())
})
.map(|cam| {
let images = (0..data.num_threads_width)
.flat_map(|ws| {
(0..data.num_threads_height)
.map(|hs| SubImage {
x: width_step * ws,
y: height_step * hs,
screen_width: image.width,
screen_height: image.height,
// Neccesary in case the threads width is not
// evenly divisible by the image width.
width: if ws == data.num_threads_width - 1 {
image.width - width_step * ws
} else {
width_step
},
// Neccesary in case the threads height is not
// evenly divisible by the image height.
height: if hs == data.num_threads_height - 1 {
image.height - height_step * hs
} else {
height_step
},
})
.collect::<Vec<SubImage>>()
})
.collect::<Vec<SubImage>>();
(cam, images)
})
.and_then(|(cam, sub_images)| {
sub_images
.into_par_iter()
.map(|image| {
scale.map_or_else(
|| {
raytrace(
buffer,
cancel_event,
(*scene).borrow(),
cam.clone(),
&image,
data,
)
},
|_| {
raytrace_scaled(
buffer,
cancel_event,
(*scene).borrow(),
cam.clone(),
&image,
data,
(scaled_width, scaled_height),
)
},
)
})
.collect::<Result<(), TracerError>>()
})
}
|
