Squashed 'external/parallel-rdp/parallel-rdp-standalone/' content from commit d1cc912c5c4

git-subtree-dir: external/parallel-rdp/parallel-rdp-standalone
git-subtree-split: d1cc912c5c47abaf9b6b155d3cd15255df65cf5b

util/timer.hpp

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+/* 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.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+namespace Util
+{
+class FrameTimer
+{
+public:
+	FrameTimer();
+
+	void reset();
+	double frame();
+	double frame(double frame_time);
+	double get_elapsed() const;
+	double get_frame_time() const;
+
+	void enter_idle();
+	void leave_idle();
+
+private:
+	int64_t start;
+	int64_t last;
+	int64_t last_period;
+	int64_t idle_start;
+	int64_t idle_time = 0;
+	int64_t get_time();
+};
+
+class Timer
+{
+public:
+	void start();
+	double end();
+
+private:
+	int64_t t = 0;
+};
+
+int64_t get_current_time_nsecs();
+}