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use crate::calculus::calculus::Point3;
use crate::interval::Interval;
// "Ideal" aspect ratio, allowing fraction
pub const ASPECT_RATIO: f32 = 16.0f32 / 9.0f32;
pub const IMG_WIDTH: usize = 400;
pub const IMG_HEIGHT: usize = get_image_height(IMG_WIDTH, ASPECT_RATIO);
pub const VIEWPORT_HEIGHT: f32 = 2.0;
pub const FOCAL_LENGTH: f32 = 1.0;
pub const CAMERA_CENTER: Point3 = Point3 { x: 0f32, y: 0f32, z: 0f32 };
pub const SAMPLES_PER_PIXEL: usize = 100;
pub const MAX_DEPTH: usize = 50;
pub const fn get_image_height(image_width: usize, aspect_ratio: f32) -> usize {
let image_height = (image_width as f32 / aspect_ratio) as usize;
if image_width < 1 { 1 } else { image_height }
}
#[derive(Debug, Clone)]
pub struct Color {
pub r: f32,
pub g: f32,
pub b: f32,
}
impl Color {
pub fn new(r: f32, g: f32, b: f32) -> Self {
Self { r, g, b }
}
pub fn mul_scalar(&self, scalar: f32) -> Color {
Self {
r: self.r * scalar,
g: self.g * scalar,
b: self.b * scalar,
}
}
pub fn add(&self, other: &Self) -> Color {
Self {
r: self.r + other.r,
g: self.g + other.g,
b: self.b + other.b
}
}
fn _linear_to_gamma(linear_comp: f32) -> f32 {
if linear_comp > 0.0 { linear_comp.sqrt() } else { 0.0 }
}
pub fn linear_to_gamma(&mut self) {
self.r = Self::_linear_to_gamma(self.r);
self.g = Self::_linear_to_gamma(self.g);
self.b = Self::_linear_to_gamma(self.b);
}
}
#[derive(Debug, Copy, Clone)]
pub struct Pixel {
pub r: u8,
pub g: u8,
pub b: u8,
}
impl Pixel {
pub fn from_frac(r: f32, g: f32, b: f32) -> Self {
let intensity = Interval::new(0.0, 0.999);
Self {
r: (256.0 * intensity.clamp(r)) as u8,
g: (256.0 * intensity.clamp(g)) as u8,
b: (256.0 * intensity.clamp(b)) as u8,
}
}
pub fn from_color(color: &Color) -> Self {
let mut clone = color.clone();
clone.linear_to_gamma();
let (r, g, b) = (color.r, color.g, color.b);
Self::from_frac(r, g, b)
}
}
impl Default for Pixel {
fn default() -> Self {
Pixel { r:0, g:0, b:0 }
}
}
pub type DisplayBuffer = [[Pixel; IMG_WIDTH]; IMG_HEIGHT];
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