Add benchmarks for noise (#56)

benchmarks/math/noise.gd

@@ -0,0 +1,33 @@
+extends Benchmark
+
+const NUM_ITERATIONS := 1000000
+
+func _bench_noise(noise) -> void:
+	for i in NUM_ITERATIONS:
+		noise.get_noise_1d(i)
+		noise.get_noise_2d(i, i)
+		noise.get_noise_3d(i, i, i)
+
+func _fast_noise(type: FastNoiseLite.NoiseType) -> FastNoiseLite:
+	var noise := FastNoiseLite.new()
+	noise.noise_type = type
+	noise.seed = 234
+	return noise
+
+func benchmark_value() -> void:
+	return _bench_noise(_fast_noise(FastNoiseLite.TYPE_VALUE))
+
+func benchmark_value_cubic() -> void:
+	return _bench_noise(_fast_noise(FastNoiseLite.TYPE_VALUE_CUBIC))
+
+func benchmark_perlin() -> void:
+	return _bench_noise(_fast_noise(FastNoiseLite.TYPE_PERLIN))
+
+func benchmark_cellular() -> void:
+	return _bench_noise(_fast_noise(FastNoiseLite.TYPE_CELLULAR))
+
+func benchmark_simplex() -> void:
+	return _bench_noise(_fast_noise(FastNoiseLite.TYPE_SIMPLEX))
+
+func benchmark_simplex_smooth() -> void:
+	return _bench_noise(_fast_noise(FastNoiseLite.TYPE_SIMPLEX_SMOOTH))