Add benches/ directory referenced in Cargo.toml.

rtiow/benches/spheres.rs

@@ -0,0 +1,37 @@
+#[macro_use]
+extern crate criterion;
+
+use criterion::Criterion;
+use criterion::ParameterizedBenchmark;
+
+use rtiow::hitable::Hit;
+use rtiow::material::Lambertian;
+use rtiow::ray::Ray;
+use rtiow::sphere::Sphere;
+use rtiow::texture::ConstantTexture;
+use rtiow::vec3::Vec3;
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let sphere = Sphere::new(
+        Vec3::new(0., 0., 0.),
+        1.,
+        Lambertian::new(ConstantTexture::new([1., 0., 0.])),
+    );
+    let rays = vec![
+        // Hit
+        Ray::new([0., 0., -2.], [0., 0., 1.], 0.),
+        // Miss
+        Ray::new([0., 0., -2.], [0., 0., -1.], 0.),
+    ];
+    c.bench(
+        "sphere",
+        ParameterizedBenchmark::new(
+            "Sphere",
+            move |b, r| b.iter(|| sphere.hit(*r, 0., 1.)),
+            rays,
+        ),
+    );
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);