48 lines
1.2 KiB
Rust
48 lines
1.2 KiB
Rust
use image::{DynamicImage, ImageReader};
|
|
|
|
use crate::{
|
|
objects::{hit::Hit, materials::traits::Material},
|
|
ray::Ray,
|
|
vec3::Vec3,
|
|
};
|
|
|
|
#[derive(Debug)]
|
|
pub struct Texture {
|
|
source: DynamicImage,
|
|
width: u32,
|
|
height: u32,
|
|
}
|
|
|
|
impl Texture {
|
|
pub fn new(texture: &str) -> Self {
|
|
let img = ImageReader::open(texture).unwrap().decode().unwrap(); // FIXME: unwraps
|
|
Self {
|
|
width: img.width(),
|
|
height: img.height(),
|
|
source: img,
|
|
}
|
|
}
|
|
|
|
fn _idx(&self, u: f32, v: f32) -> usize {
|
|
let x: usize = (u * ((self.width - 1) as f32)) as usize; // TODO: check these calcs work
|
|
let y: usize = (v * ((self.height - 1) as f32)) as usize;
|
|
|
|
y * self.width as usize + x
|
|
}
|
|
|
|
fn _at(&self, u: f32, v: f32) -> Vec3 {
|
|
let b = self.source.as_bytes(); // FIXME: i think im indexing colours incorrectly
|
|
let idx = self._idx(u, v);
|
|
|
|
Vec3::from_u8(b[3 * idx], b[3 * idx + 1], b[3 * idx + 2])
|
|
}
|
|
}
|
|
|
|
impl Material for Texture {
|
|
fn scatter(&self, hit: &Hit, _ray: &Ray) -> Option<(Option<Ray>, Vec3)> {
|
|
let (u, v) = hit.uv();
|
|
let col = self._at(u, 1. - v);
|
|
return Some((None, col));
|
|
}
|
|
}
|