Moved benchmark to separate header, output summary to stdout

Refs #269

base/benchmark.hpp

@@ -0,0 +1,82 @@
+/*
+* Benchmark class
+*
+* Copyright (C) 2016-2017 by Sascha Willems - www.saschawillems.de
+*
+* This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
+*/
+
+#include <vector>
+#include <string>
+#include <algorithm>
+#include <limits>
+#include <functional>
+#include <chrono>
+#include <iomanip>
+
+namespace vks
+{
+	class Benchmark {
+	public:
+		bool active = false;
+		uint32_t framesPerIteration = 1000;
+		uint32_t iterations = 10;
+		std::vector<double> iterationTimes;
+		std::string filename = "benchmarkresults.csv";
+
+		Benchmark() {
+			active = true;
+			iterationTimes.resize(iterations);
+
+#if defined(_WIN32)
+			AttachConsole(ATTACH_PARENT_PROCESS);
+			FILE *stream;
+			freopen_s(&stream, "CONOUT$", "w+", stdout);
+			freopen_s(&stream, "CONOUT$", "w+", stderr);
+#endif
+		}
+
+		void run(std::function<void()> renderFunc) {
+			static uint32_t currIteration;
+			for (uint32_t i = 0; i < iterations; i++) {
+				for (uint32_t f = 0; f < framesPerIteration; f++) {
+					auto tStart = std::chrono::high_resolution_clock::now();
+					renderFunc();
+					auto tEnd = std::chrono::high_resolution_clock::now();
+					auto tDiff = std::chrono::duration<double, std::milli>(tEnd - tStart).count();
+					double frameTime = (double)tDiff / 1000.0;
+					iterationTimes[i] += frameTime;
+				}
+			}
+		}
+
+		void saveResults(std::string appinfo, std::string deviceinfo) {
+			std::ofstream result(filename, std::ios::out);
+			if (result.is_open()) {
+
+				double tMin = *std::min_element(iterationTimes.begin(), iterationTimes.end());
+				double tMax = *std::max_element(iterationTimes.begin(), iterationTimes.end());
+				double tAvg = std::accumulate(iterationTimes.begin(), iterationTimes.end(), 0.0) / iterations;
+
+				result << std::fixed << std::setprecision(3);
+				result << appinfo << std::endl;
+				result << deviceinfo << std::endl;
+				result << ",iterations,time(ms),fps" << std::endl;;
+				for (size_t i = 0; i < iterationTimes.size(); i++) {
+					result << "," << i << "," << iterationTimes[i] << "," << (framesPerIteration / iterationTimes[i]) << std::endl;
+				}
+				result << ",summary" << std::endl;
+				result << ",,time(ms),fps" << std::endl;
+				result << ",min," << tMin << "," << (1000.0 / tMin) << std::endl;
+				result << ",max," << tMax << "," << (1000.0 / tMax) << std::endl;
+				result << ",avg," << tAvg << "," << (1000.0 / tAvg) << std::endl;
+
+				// Output averages to stdout
+				std::cout << std::fixed << std::setprecision(3);
+				std::cout << "best : " << (1000.0 / tMin) << " fps (" << tMin << " ms)" << std::endl;
+				std::cout << "worst: " << (1000.0 / tMax) << " fps (" << tMax << " ms)" << std::endl;
+				std::cout << "avg  : " << (1000.0 / tAvg) << " fps (" << tAvg << " ms)" << std::endl;
+			}
+		}
+	};
+}