wip: parallelization

src/vec3.rs

@@ -122,7 +122,7 @@ impl Vec3 {
         r_out_perp + r_out_parr
     }
 
-    pub fn output(self) -> image::Rgb<u8> {
+    pub fn output(self) -> (u8, u8, u8) {
         // gamma correction
         let r = if self.x > 0. {
             sqrt(self.x).clamp(0., 1.)
@@ -144,7 +144,7 @@ impl Vec3 {
         let ig = (255.599 * g) as u8;
         let ib = (255.599 * b) as u8;
 
-        image::Rgb([ir, ig, ib])
+        (ir, ig, ib)
     }
 
     pub fn clone(&self) -> Self {