V2 working

apps/RenderCadenceCompositor/render/RenderThread.h

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+#pragma once
+
+#include "RenderCadenceClock.h"
+
+#include <atomic>
+#include <condition_variable>
+#include <cstddef>
+#include <cstdint>
+#include <mutex>
+#include <string>
+#include <thread>
+
+class SystemFrameExchange;
+
+class RenderThread
+{
+public:
+	struct Config
+	{
+		unsigned width = 1920;
+		unsigned height = 1080;
+		double frameDurationMilliseconds = 1000.0 / 59.94;
+		std::size_t pboDepth = 6;
+	};
+
+	struct Metrics
+	{
+		uint64_t renderedFrames = 0;
+		uint64_t completedReadbacks = 0;
+		uint64_t acquireMisses = 0;
+		uint64_t pboQueueMisses = 0;
+		uint64_t clockOverruns = 0;
+		uint64_t skippedFrames = 0;
+	};
+
+	RenderThread(SystemFrameExchange& frameExchange, Config config);
+	RenderThread(const RenderThread&) = delete;
+	RenderThread& operator=(const RenderThread&) = delete;
+	~RenderThread();
+
+	bool Start(std::string& error);
+	void Stop();
+
+	Metrics GetMetrics() const;
+	bool IsRunning() const { return mRunning.load(std::memory_order_acquire); }
+
+private:
+	void ThreadMain();
+	void SignalStarted();
+	void SignalStartupFailure(const std::string& error);
+	void CountRendered();
+	void CountCompleted();
+	void CountAcquireMiss();
+
+	SystemFrameExchange& mFrameExchange;
+	Config mConfig;
+	std::thread mThread;
+	std::atomic<bool> mStopping{ false };
+	std::atomic<bool> mRunning{ false };
+
+	mutable std::mutex mStartupMutex;
+	std::condition_variable mStartupCondition;
+	bool mStarted = false;
+	std::string mStartupError;
+
+	mutable std::mutex mMetricsMutex;
+	Metrics mMetrics;
+};