Merge commit 'd94eccab99da355a1ad43494aec3c479b13b35dc' as 'external/parallel-rdp/parallel-rdp-standalone'

external/parallel-rdp/parallel-rdp-standalone/util/timer.cpp

@@ -0,0 +1,131 @@
+/* Copyright (c) 2017-2023 Hans-Kristian Arntzen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "timer.hpp"
+
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#else
+#include <time.h>
+#endif
+
+namespace Util
+{
+FrameTimer::FrameTimer()
+{
+	reset();
+}
+
+void FrameTimer::reset()
+{
+	start = get_time();
+	last = start;
+	last_period = 0;
+}
+
+void FrameTimer::enter_idle()
+{
+	idle_start = get_time();
+}
+
+void FrameTimer::leave_idle()
+{
+	auto idle_end = get_time();
+	idle_time += idle_end - idle_start;
+}
+
+double FrameTimer::get_frame_time() const
+{
+	return double(last_period) * 1e-9;
+}
+
+double FrameTimer::frame()
+{
+	auto new_time = get_time() - idle_time;
+	last_period = new_time - last;
+	last = new_time;
+	return double(last_period) * 1e-9;
+}
+
+double FrameTimer::frame(double frame_time)
+{
+	last_period = int64_t(frame_time * 1e9);
+	last += last_period;
+	return frame_time;
+}
+
+double FrameTimer::get_elapsed() const
+{
+	return double(last - start) * 1e-9;
+}
+
+int64_t FrameTimer::get_time()
+{
+	return get_current_time_nsecs();
+}
+
+#ifdef _WIN32
+struct QPCFreq
+{
+	QPCFreq()
+	{
+		LARGE_INTEGER freq;
+		QueryPerformanceFrequency(&freq);
+		inv_freq = 1e9 / double(freq.QuadPart);
+	}
+
+	double inv_freq;
+} static static_qpc_freq;
+#endif
+
+int64_t get_current_time_nsecs()
+{
+#ifdef _WIN32
+	LARGE_INTEGER li;
+	if (!QueryPerformanceCounter(&li))
+		return 0;
+	return int64_t(double(li.QuadPart) * static_qpc_freq.inv_freq);
+#else
+	struct timespec ts = {};
+#if defined(ANDROID) || defined(__FreeBSD__)
+	constexpr auto timebase = CLOCK_MONOTONIC;
+#else
+	constexpr auto timebase = CLOCK_MONOTONIC_RAW;
+#endif
+	if (clock_gettime(timebase, &ts) < 0)
+		return 0;
+	return ts.tv_sec * 1000000000ll + ts.tv_nsec;
+#endif
+}
+
+void Timer::start()
+{
+	t = get_current_time_nsecs();
+}
+
+double Timer::end()
+{
+	auto nt = get_current_time_nsecs();
+	return double(nt - t) * 1e-9;
+}
+}