Achieve anti aliasing with multi pixel sampling

1 files changed, 14 insertions, 9 deletions

diff --git a/src/render.rs b/src/render.rs
index 7d05aba..c8a75da 100644
--- a/src/render.rs
+++ b/src/render.rs
@@ -5,8 +5,9 @@ use crate::camera::film::FilmTile;
 use crate::camera::Camera;
 use crate::scene::Scene;
 use crate::trace::Tracer;
+use crate::sample::Sampler;
 
-use crate::core::{Vector2f, Vector3f, Spectrum};
+use crate::core::{Vector2f, Spectrum};
 use crate::Float;
 
 pub struct RenderTask {
@@ -25,20 +26,24 @@ impl RenderTask {
         Self { tile, samples }
     }
 
-    fn render_at(&self, ctx: &RenderContext, x: i32, y: i32) -> Spectrum {
-        // Create a ray
-        let (r, _) = ctx.cam.generate_ray(&Vector2f::new_xy(x as Float, y as Float));
+    fn render_at(&mut self, ctx: &RenderContext, x: i32, y: i32, sampler: &mut dyn Sampler) {
+        let corner = Vector2f::new_xy(x as Float, y as Float);
 
-        ctx.trc.trace(ctx.scn, &r)
+        for _ in 0..self.samples {
+            let p = corner + sampler.get_sample_2d();
+
+            // Create a ray
+            let (r, _) = ctx.cam.generate_ray(&p);
+
+            self.tile.add_sample(&p, ctx.trc.trace(ctx.scn, &r));
+        }
     }
 
-    pub fn render(&mut self, ctx: &RenderContext) {
+    pub fn render(&mut self, ctx: &RenderContext, sampler: &mut dyn Sampler) {
         let b = self.tile.bounds.clone();
         for x in b.min.x .. b.max.x {
             for y in b.min.y .. b.max.y {
-                let p = Vector2f::new_xy(x as Float, y as Float);
-
-                self.tile.add_sample(&p, self.render_at(ctx, x, y))
+                self.render_at(ctx, x, y, sampler);
             }
         }
     }