GraphicsEngine.h

//
//  GraphicsEngine.h
//
//  Created by Sam Gateau on 29/6/2018.
//  Copyright 2018 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
//
#ifndef hifi_GraphicsEngine_h
#define hifi_GraphicsEngine_h
 
#include <gl/OffscreenGLCanvas.h>
#include <gl/GLWidget.h>
#include <qmutex.h>
 
#include <render/Engine.h>
#include <procedural/ProceduralSkybox.h>
 
#include <OctreeConstants.h>
#include <shared/RateCounter.h>
 
#include "FrameTimingsScriptingInterface.h"
 
 
struct AppRenderArgs {
    render::Args _renderArgs;
    glm::mat4 _eyeToWorld;
    glm::mat4 _view;
    glm::mat4 _eyeOffsets[2];
    glm::mat4 _eyeProjections[2];
    glm::mat4 _headPose;
    glm::mat4 _sensorToWorld;
    float _sensorToWorldScale{ 1.0f };
    bool _isStereo{ false };
};
 
using RenderArgsEditor = std::function <void(AppRenderArgs&)>;
 
 
class GraphicsEngine {
public:
    GraphicsEngine();
    ~GraphicsEngine();
 
    void initializeGPU(GLWidget*);
    void initializeRender();
    void startup();
    void shutdown();
 
    render::ScenePointer getRenderScene() const { return _renderScene; }
    render::EnginePointer getRenderEngine() const { return _renderEngine; }
    gpu::ContextPointer getGPUContext() const { return _gpuContext; }
 
    // Same as the one in application
    bool shouldPaint() const;
    bool checkPendingRenderEvent();
 
    size_t getRenderFrameCount() const { return _renderFrameCount; }
    float getRenderLoopRate() const { return _renderLoopCounter.rate(); }
 
    // Feed GRaphics Engine with new frame configuration
    void editRenderArgs(RenderArgsEditor editor);
 
private:
    // Thread specific calls
    void render_performFrame();
    void render_runRenderFrame(RenderArgs* renderArgs);
 
protected:
 
    mutable QRecursiveMutex _renderArgsMutex;
    AppRenderArgs _appRenderArgs;
 
    RateCounter<500> _renderLoopCounter;
 
    uint32_t _renderFrameCount{ 0 };
    render::ScenePointer _renderScene{ new render::Scene(glm::vec3(-0.5f * (float)TREE_SCALE), (float)TREE_SCALE) };
    render::EnginePointer _renderEngine{ new render::RenderEngine() };
 
    gpu::ContextPointer _gpuContext; // initialized during window creation
 
    QObject* _renderEventHandler{ nullptr };
    friend class RenderEventHandler;
 
    FrameTimingsScriptingInterface _frameTimingsScriptingInterface;
 
    std::shared_ptr<ProceduralSkybox> _splashScreen { std::make_shared<ProceduralSkybox>() };
#ifndef Q_OS_ANDROID
    std::atomic<bool> _programsCompiled { false };
#else
    std::atomic<bool> _programsCompiled { true };
#endif
 
    friend class Application;
};
 
#endif // hifi_GraphicsEngine_h