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use crate::core::*;
use crate::Float;
use image::{RgbImage, Rgb};
/// Contains the necesary values when doing calculations
///
/// This is not the final RGB value
#[derive(Clone)]
pub struct Pixel {
/// The sum of the collected samples
rgb: Spectrum,
/// The amount of samples collected
samples: u32,
}
pub struct Film {
size: Vector2i,
pub frame: Bound2i,
pixels: Vec<Pixel>,
}
/// FilmTile is a small version of the Film used when rendering
///
/// This means that multiple threads can work on the same area and commit their changed when they
/// are done.
pub struct FilmTile {
pub bounds: Bound2i,
pub size: Vector2i,
pixels: Vec<Pixel>,
}
impl Pixel {
fn new() -> Pixel {
Pixel {
rgb: Default::default(),
samples: 0,
}
}
fn add(&mut self, c: &Spectrum, weight: Float) {
self.rgb += &(*c * weight);
self.samples += 1;
}
fn finalize_rgb(&self) -> [u8; 3] {
let spc = (self.rgb / (self.samples as Float)).gamma_correct();
let (r, g, b) = spc.to_rgb(255.0);
[
r as u8,
g as u8,
b as u8,
]
}
}
impl std::ops::AddAssign<&Self> for Pixel {
fn add_assign(&mut self, op: &Self) {
self.rgb += &op.rgb;
self.samples += op.samples;
}
}
impl Film {
pub fn new(size: Vector2i) -> Film {
let area = size.x * size.y;
Film {
size,
frame: Bound2i::new(&Vector2i::new(0), &size),
pixels: vec![Pixel::new(); area as usize],
}
}
/// Creates a new FilmTile from the specified bounds
///
/// This tile can later be commited with the commit_tile function
pub fn get_tile(&self, bound: &Bound2i) -> FilmTile {
FilmTile::new(
bound,
)
}
/// Commit a tile back on the film
///
/// This will lock the Film while the changes from the Tile is written
pub fn commit_tile(&mut self, tile: &FilmTile) {
let offset = tile.bounds.min;
for y in 0 .. tile.size.y {
let rowindex = (offset.y + y) * self.size.x;
let prowindex = y * tile.size.x;
for x in 0 .. tile.size.x {
let index = offset.x + x + rowindex;
let pindex: i32 = x + prowindex;
self.pixels[index as usize] += &tile.pixels[pindex as usize];
}
}
}
pub fn finalize_image(&self) -> RgbImage {
let mut img = RgbImage::new(self.size.x as u32, self.size.y as u32);
for y in 0..self.size.y {
let index = y * self.size.x;
for x in 0..self.size.x {
img.put_pixel(
x as u32,
y as u32,
Rgb(self.pixels[(index + x) as usize].finalize_rgb()),
);
}
}
img
}
}
impl FilmTile {
fn new(bounds: &Bound2i) -> FilmTile {
FilmTile {
bounds: bounds.clone(),
pixels: vec![Pixel::new(); bounds.area() as usize],
size: bounds.diagonal(),
}
}
/// Add a single sample sampled from the scene
pub fn add_sample(&mut self, inp: &Vector2f, c: Spectrum) {
let point = Vector2i::from(inp.floor());
// Subtract the offset
let point = point - self.bounds.min;
let index = point.x + point.y * self.size.x;
let pixel = self.pixels.get_mut(index as usize).unwrap();
pixel.add(&c, 1.0);
}
}
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