1 files changed, 149 insertions, 0 deletions
diff --git a/Tools/NoiseSpeedTest/NoiseSpeedTest.cpp b/Tools/NoiseSpeedTest/NoiseSpeedTest.cpp
new file mode 100644
index 000000000..6857b1a27
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+++ b/Tools/NoiseSpeedTest/NoiseSpeedTest.cpp
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+// NoiseSpeedTest.cpp
+
+// Implements the main app entrypoint
+
+/*
+This program compares the performance of the highly-optimized noise implementation in Cuberite, and the Simplex noise.
+Since the Simplex noise is not yet implemented in Cuberite, an own implementation is provided.
+Also, the performance difference between using a float and double as datatype is measured, by using a templatized Simplex noise.
+
+The testing is done on a usage of the generator that is typical for the Cuberite's terrain generator: generate a 3D array of numbers with
+not much variance in the coords. The exact sizes and coord ranges were adapted from the cNoise3DComposable generator.
+*/
+
+#include "Globals.h"
+#include "Noise/Noise.h"
+#include "Noise/InterpolNoise.h"
+#include "SimplexNoise.h"
+
+
+
+
+
+/// The sizes of the interpolated noise that are calculated:
+static const int SIZE_X = 33;
+static const int SIZE_Y = 5;
+static const int SIZE_Z = 5;
+
+
+
+
+
+static void measureClassicNoise(int a_NumIterations)
+{
+	cInterp5DegNoise noise(1);
+	NOISE_DATATYPE total = 0;
+	auto timeStart = std::chrono::high_resolution_clock::now();
+	for (int i = 0; i < a_NumIterations; ++i)
+	{
+		NOISE_DATATYPE out[SIZE_X * SIZE_Y * SIZE_Z];
+		int blockX = i * 16;
+		int blockZ = i * 16;
+		NOISE_DATATYPE startX = 0;
+		NOISE_DATATYPE endX = 257 / 80.0f;
+		NOISE_DATATYPE startY = blockX / 40.0f;
+		NOISE_DATATYPE endY = (blockX + 16) / 40.0f;
+		NOISE_DATATYPE startZ = blockZ / 40.0f;
+		NOISE_DATATYPE endZ = (blockZ + 16) / 40.0f;
+		noise.Generate3D(out, SIZE_X, SIZE_Y, SIZE_Z, startX, endX, startY, endY, startZ, endZ);
+		total += out[0];  // Do not let the optimizer optimize the whole calculation away
+	}
+	auto timeEnd = std::chrono::high_resolution_clock::now();
+	auto msec = std::chrono::duration_cast<std::chrono::milliseconds>(timeEnd - timeStart);
+	printf("Classic noise took %d milliseconds, returned total %f\n", static_cast<int>(msec.count()), total);
+}
+
+
+
+
+
+static void measureSimplexNoiseFloat(int a_NumIterations)
+{
+	typedef float DATATYPE;
+	cSimplexNoise<DATATYPE> noise(1);
+	DATATYPE total = 0;
+	auto timeStart = std::chrono::high_resolution_clock::now();
+	for (int i = 0; i < a_NumIterations; ++i)
+	{
+		DATATYPE out[SIZE_X * SIZE_Y * SIZE_Z];
+		int blockX = i * 16;
+		int blockZ = i * 16;
+		DATATYPE startX = 0;
+		DATATYPE endX = 257 / 80.0f;
+		DATATYPE startY = blockX / 40.0f;
+		DATATYPE endY = (blockX + 16) / 40.0f;
+		DATATYPE startZ = blockZ / 40.0f;
+		DATATYPE endZ = (blockZ + 16) / 40.0f;
+		noise.Generate3D(out, SIZE_X, SIZE_Y, SIZE_Z, startX, endX, startY, endY, startZ, endZ);
+		total += out[0];  // Do not let the optimizer optimize the whole calculation away
+	}
+	auto timeEnd = std::chrono::high_resolution_clock::now();
+	auto msec = std::chrono::duration_cast<std::chrono::milliseconds>(timeEnd - timeStart);
+	printf("SimplexNoise<float> took %d milliseconds, returned total %f\n", static_cast<int>(msec.count()), total);
+}
+
+
+
+
+
+static void measureSimplexNoiseDouble(int a_NumIterations)
+{
+	typedef double DATATYPE;
+	cSimplexNoise<DATATYPE> noise(1);
+	DATATYPE total = 0;
+	auto timeStart = std::chrono::high_resolution_clock::now();
+	for (int i = 0; i < a_NumIterations; ++i)
+	{
+		DATATYPE out[SIZE_X * SIZE_Y * SIZE_Z];
+		int blockX = i * 16;
+		int blockZ = i * 16;
+		DATATYPE startX = 0;
+		DATATYPE endX = 257 / 80.0f;
+		DATATYPE startY = blockX / 40.0f;
+		DATATYPE endY = (blockX + 16) / 40.0f;
+		DATATYPE startZ = blockZ / 40.0f;
+		DATATYPE endZ = (blockZ + 16) / 40.0f;
+		noise.Generate3D(out, SIZE_X, SIZE_Y, SIZE_Z, startX, endX, startY, endY, startZ, endZ);
+		total += out[0];  // Do not let the optimizer optimize the whole calculation away
+	}
+	auto timeEnd = std::chrono::high_resolution_clock::now();
+	auto msec = std::chrono::duration_cast<std::chrono::milliseconds>(timeEnd - timeStart);
+	printf("SimplexNoise<double> took %d milliseconds, returned total %f\n", static_cast<int>(msec.count()), total);
+}
+
+
+
+
+
+int main(int argc, char ** argv)
+{
+	int numIterations = 10000;
+	if (argc > 1)
+	{
+		numIterations = std::atoi(argv[1]);
+		if (numIterations < 10)
+		{
+			printf("Invalid number of iterations, using 1000 instead\n");
+			numIterations = 1000;
+		}
+	}
+
+	// Perform each test twice, to account for cache-warmup:
+	measureClassicNoise(numIterations);
+	measureClassicNoise(numIterations);
+	measureSimplexNoiseFloat(numIterations);
+	measureSimplexNoiseFloat(numIterations);
+	measureSimplexNoiseDouble(numIterations);
+	measureSimplexNoiseDouble(numIterations);
+
+	// If build on Windows using MSVC, wait for a keypress before ending:
+	#ifdef _MSC_VER
+		getchar();
+	#endif
+
+	return 0;
+}
+
+
+
+