benchmarking: add bench for spectrum.rs

clovers/Cargo.toml

@@ -48,3 +48,7 @@ harness = false
 [[bench]]
 name = "wavelength"
 harness = false
+
+[[bench]]
+name = "spectrum"
+harness = false

clovers/benches/spectrum.rs

@@ -0,0 +1,24 @@
+use clovers::spectrum::*;
+use clovers::wavelength::*;
+use divan::black_box;
+use palette::white_point::E;
+use palette::Xyz;
+use rand::rngs::SmallRng;
+use rand::Rng;
+use rand::SeedableRng;
+
+fn main() {
+    divan::main();
+}
+
+#[divan::bench]
+fn xyz_to_p(bencher: divan::Bencher) {
+    bencher
+        .with_inputs(|| {
+            let mut rng = SmallRng::from_entropy();
+            let wave = random_wavelength(&mut rng);
+            let xyz: Xyz<E> = Xyz::new(rng.gen(), rng.gen(), rng.gen());
+            (wave, xyz)
+        })
+        .bench_values(|(wave, xyz)| black_box(spectrum_xyz_to_p(wave, xyz)))
+}