////  Created by Bradley Austin Davis on 2018/10/21//  Copyright 2014 High Fidelity, Inc.////  Distributed under the Apache License, Version 2.0.//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html// #pragma once #include <QtCore/QElapsedTimer> #include <GenericThread.h>#include <shared/RateCounter.h>#include <gl/Config.h>#include <gl/Context.h>#include <gpu/gl/GLBackend.h>#include <ovr/VrHandler.h> class RenderThread : public GenericThread, ovr::VrHandler {    using Parent = GenericThread;public:    std::mutex _mutex;    gpu::ContextPointer _gpuContext;  // initialized during window creation    std::shared_ptr<gpu::Backend> _backend;    std::mutex _frameLock;    std::queue<gpu::FramePointer> _pendingFrames;    gpu::FramePointer _activeFrame;    uint32_t _externalTexture{ 0 };    glm::mat4 _correction;     void move(const glm::vec3& v);    void setup() override;    bool process() override;    void shutdown() override;     void handleInput();     void submitFrame(const gpu::FramePointer& frame);    void initialize();    void renderFrame();};