benches

benches/systems_benchmark.rs

@@ -0,0 +1,16 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use rltk::RGB;
+
+/// Benchmarks methods from rltk used to desaturate non-visible tiles.
+// Greyscale is significantly faster, but generally looks worse - the
+// third alternative is directly setting the desaturated value, if it
+// is known in advance.
+fn nonvisible_benchmark(c: &mut Criterion) {
+    let bg = black_box(RGB::from_f32(0.4, 0., 0.));
+
+    c.bench_function("rgb -> greyscale", |b| b.iter(|| bg.to_greyscale()));
+    c.bench_function("rgb -> desaturate", |b| b.iter(|| bg.desaturate()));
+}
+
+criterion_group!(benches, nonvisible_benchmark);
+criterion_main!(benches);