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use std::io::Write;
use crate::vec3::Color;
use crate::display::{Display, Pixel};
pub struct Image {
width: usize,
height: usize,
data: Vec<Pixel>,
}
impl Image {
pub fn new(width: usize, height: usize) -> Image {
let data = vec![
Pixel {
color: Color {
x: 0.0,
y: 0.0,
z: 0.0
},
sample_count: 0
};
width * height
];
Image {
width,
height,
data,
}
}
}
impl Display for Image {
fn add_sample(&mut self, x: usize, y: usize, color: Color) {
self.data
.get_mut((y * self.width) + x)
.unwrap()
.update(color);
}
fn maybe_write(&self, output: &mut impl Write) {
output.write_fmt(format_args!("P3\n{} {}\n255\n", self.width, self.height)).unwrap();
for y in (0..self.height).rev() {
for x in 0..self.width {
let pixel = self.data.get((y * self.width) + x).unwrap();
let mut r = pixel.color.x;
let mut g = pixel.color.y;
let mut b = pixel.color.z;
// Divide by the number of samples and perform gamma correction for gamma 2
let scale = 1.0 / pixel.sample_count as f64;
r = (r * scale).sqrt();
g = (g * scale).sqrt();
b = (b * scale).sqrt();
output
.write_fmt(format_args!(
"{} {} {}\n",
(256.0 * r.clamp(0.0, 0.999)) as u32,
(256.0 * g.clamp(0.0, 0.999)) as u32,
(256.0 * b.clamp(0.0, 0.999)) as u32,
))
.unwrap();
}
}
}
fn maybe_update(&mut self) {}
}
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