ft (wip): textures

src/objects/materials/texture.rs

@@ -0,0 +1,47 @@
+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));
+    }
+}