Shader compile thread seperation

apps/LoopThroughWithOpenGLCompositing/gl/ShaderBuildQueue.h

@@ -0,0 +1,57 @@
+#pragma once
+
+#include "ShaderTypes.h"
+
+#include <condition_variable>
+#include <cstdint>
+#include <mutex>
+#include <string>
+#include <thread>
+#include <vector>
+
+class RuntimeHost;
+
+struct PreparedLayerShader
+{
+	RuntimeRenderState state;
+	std::string fragmentShaderSource;
+};
+
+struct PreparedShaderBuild
+{
+	uint64_t generation = 0;
+	bool succeeded = false;
+	std::string message;
+	std::vector<RuntimeRenderState> layerStates;
+	std::vector<PreparedLayerShader> layers;
+};
+
+class ShaderBuildQueue
+{
+public:
+	explicit ShaderBuildQueue(RuntimeHost& runtimeHost);
+	~ShaderBuildQueue();
+
+	ShaderBuildQueue(const ShaderBuildQueue&) = delete;
+	ShaderBuildQueue& operator=(const ShaderBuildQueue&) = delete;
+
+	void RequestBuild(unsigned outputWidth, unsigned outputHeight);
+	bool TryConsumeReadyBuild(PreparedShaderBuild& build);
+	void Stop();
+
+private:
+	void WorkerLoop();
+	PreparedShaderBuild Build(uint64_t generation, unsigned outputWidth, unsigned outputHeight);
+
+	RuntimeHost& mRuntimeHost;
+	std::thread mWorkerThread;
+	std::mutex mMutex;
+	std::condition_variable mCondition;
+	bool mStopping = false;
+	bool mHasRequest = false;
+	uint64_t mRequestedGeneration = 0;
+	unsigned mRequestedOutputWidth = 0;
+	unsigned mRequestedOutputHeight = 0;
+	bool mHasReadyBuild = false;
+	PreparedShaderBuild mReadyBuild;
+};