/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Copyright (C) 2015 The Qt Company Ltd and/or its subsidiary(-ies).
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** packaging of this file. Please review the following information to
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** General Public License version 2.0 or later as published by the Free
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** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
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****************************************************************************/

#ifndef QT3DRENDER_RENDER_RENDERER_H
#define QT3DRENDER_RENDER_RENDERER_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of other Qt classes.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <Qt3DRenderer/qrenderaspect.h>
#include <Qt3DRenderer/qtechnique.h>
#include <Qt3DRenderer/private/quniformvalue_p.h>
#include <Qt3DRenderer/private/handle_types_p.h>
#include <Qt3DCore/qaspectjob.h>

#include <QHash>
#include <QMatrix4x4>
#include <QObject>

#include <QOpenGLShaderProgram>
#include <QOpenGLVertexArrayObject>
#include <QOpenGLBuffer>
#include <QMutex>
#include <QWaitCondition>
#include <QAtomicInt>
#include <QScopedPointer>
#include <QSemaphore>
#include <QThreadStorage>

QT_BEGIN_NAMESPACE

class QSurface;
class QOpenGLDebugLogger;

namespace Qt3D {
class QEntity;
class QFrameAllocator;
}

namespace Qt3DRender {

class QCamera;
class QMaterial;
class QShaderProgram;
class QMesh;
class QRenderPass;
class QAbstractShapeMesh;
class QOpenGLFilter;
class AbstractSceneParser;

namespace Render {

class CameraLens;
class GraphicsContext;
class FrameGraphNode;
class Material;
class Technique;
class Shader;
class Entity;
class RenderCommand;
class CameraManager;
class EntityManager;
class RenderQueue;
class RenderView;
class MaterialManager;
class MatrixManager;
class VAOManager;
class ShaderManager;
class TechniqueManager;
class EffectManager;
class RenderPassManager;
class Effect;
class RenderPass;
class TextureManager;
class TextureDataManager;
class LayerManager;
class LightManager;
class RenderThread;
class CriterionManager;
class FrameGraphManager;
class TransformManager;
class RenderStateSet;
class RenderTargetManager;
class SceneManager;
class AttachmentManager;
class SortCriterionManager;
class ParameterManager;
class ShaderDataManager;
class UBOManager;
class TextureImageManager;
class VSyncFrameAdvanceService;
class BufferManager;
class AttributeManager;
class GeometryManager;
class GeometryRendererManager;

class Renderer
{
public:
    explicit Renderer(QRenderAspect::RenderType type);
    ~Renderer();

    void setQRenderAspect(QRenderAspect *aspect) { m_rendererAspect = aspect; }
    QRenderAspect *rendererAspect() const { return m_rendererAspect; }

    void createAllocators();
    void destroyAllocators();

    Qt3D::QFrameAllocator *currentFrameAllocator();

    QThreadStorage<Qt3D::QFrameAllocator *> *tlsAllocators();

    void setFrameGraphRoot(const Qt3D::QNodeId &fgRoot);
    Render::FrameGraphNode *frameGraphRoot() const;

    void setSceneGraphRoot(Entity *sgRoot);
    Entity *renderSceneRoot() const { return m_renderSceneRoot; }

    void render();
    void doRender();

    QVector<Qt3D::QAspectJobPtr> createRenderBinJobs();
    QVector<Qt3D::QAspectJobPtr> createRenderBufferJobs();
    QVector<Qt3D::QAspectJobPtr> createGeometryRendererJobs();
    Qt3D::QAspectJobPtr createRenderViewJob(FrameGraphNode *node, int submitOrderIndex);
    void executeCommands(const QVector<RenderCommand *> &commands);
    Attribute *updateBuffersAndAttributes(Geometry *geometry, RenderCommand *command, GLsizei &count, bool forceUpdate);
    void addAllocator(Qt3D::QFrameAllocator *allocator);

    inline CameraManager *cameraManager() const { return m_cameraManager; }
    inline EntityManager *renderNodesManager() const { return m_renderNodesManager; }
    inline MaterialManager *materialManager() const { return m_materialManager; }
    inline MatrixManager *worldMatrixManager() const { return m_worldMatrixManager; }
    inline VAOManager *vaoManager() const { return m_vaoManager; }
    inline ShaderManager *shaderManager() const { return m_shaderManager; }
    inline TechniqueManager *techniqueManager() const { return m_techniqueManager; }
    inline EffectManager *effectManager() const { return m_effectManager; }
    inline RenderPassManager *renderPassManager() const { return m_renderPassManager; }
    inline TextureManager *textureManager() const { return m_textureManager; }
    inline TextureDataManager *textureDataManager() const { return m_textureDataManager; }
    inline LayerManager *layerManager() const { return m_layerManager; }
    inline CriterionManager *criterionManager() const { return m_criterionManager; }
    inline FrameGraphManager *frameGraphManager() const { return m_frameGraphManager; }
    inline TransformManager *transformManager() const { return m_transformManager; }
    inline RenderTargetManager *renderTargetManager() const { return m_renderTargetManager; }
    inline SceneManager *sceneManager() const { return m_sceneManager; }
    inline AttachmentManager *attachmentManager() const { return m_attachmentManager; }
    inline SortCriterionManager *sortCriterionManager() const { return m_sortCriterionManager; }
    inline ParameterManager *parameterManager() const { return m_parameterManager; }
    inline ShaderDataManager *shaderDataManager() const { return m_shaderDataManager; }
    inline UBOManager *uboManager() const { return m_uboManager; }
    inline TextureImageManager *textureImageManager() const { return m_textureImageManager; }
    inline BufferManager *bufferManager() const { return m_bufferManager; }
    inline AttributeManager *attributeManager() const { return m_attributeManager; }
    inline GeometryManager *geometryManager() const { return m_geometryManager; }
    inline GeometryRendererManager *geometryRendererManager() const { return m_geometryRendererManager; }

    inline HMaterial defaultMaterialHandle() const { return m_defaultMaterialHandle; }
    inline HEffect defaultEffectHandle() const { return m_defaultEffectHandle; }
    inline HTechnique defaultTechniqueHandle() const { return m_defaultTechniqueHandle; }
    inline HRenderPass defaultRenderPassHandle() const { return m_defaultRenderPassHandle; }
    inline RenderStateSet *defaultRenderState() const { return m_defaultRenderStateSet; }

    inline QList<AbstractSceneParser *> sceneParsers() const { return m_sceneParsers; }
    inline VSyncFrameAdvanceService *vsyncFrameAdvanceService() const { return m_vsyncFrameAdvanceService.data(); }

    QOpenGLFilter *contextInfo() const;

    void setSurface(QSurface *s);

    void enqueueRenderView(RenderView *renderView, int submitOrder);
    bool submitRenderViews();

    void initialize(QOpenGLContext *context = Q_NULLPTR);
    void shutdown();

    QMutex* mutex() { return &m_mutex; }
    bool isRunning() const { return m_running.load(); }

private:
    bool canRender() const;

    QRenderAspect *m_rendererAspect;

    // Frame graph root
    Qt3D::QNodeId m_frameGraphRootUuid;

    Entity *m_renderSceneRoot;

    QHash<QMaterial*, Material*> m_materialHash;
    QHash<QTechnique *, Technique*> m_techniqueHash;
    QHash<QShaderProgram*, Shader*> m_shaderHash;

    QMaterial* m_defaultMaterial;
    QTechnique* m_defaultTechnique;

    HMaterial m_defaultMaterialHandle;
    HEffect m_defaultEffectHandle;
    HTechnique m_defaultTechniqueHandle;
    HRenderPass m_defaultRenderPassHandle;

    // Fail safe values that we can use if a RenderCommand
    // is missing a shader
    Shader *m_defaultRenderShader;
    RenderStateSet *m_defaultRenderStateSet;
    QHash<QString, QString> m_defaultParameterToGLSLAttributeNames;
    QUniformPack m_defaultUniformPack;

    QScopedPointer<GraphicsContext> m_graphicsContext;
    QSurface *m_surface;
    CameraManager *m_cameraManager;
    EntityManager *m_renderNodesManager;
    MaterialManager *m_materialManager;
    MatrixManager *m_worldMatrixManager;
    VAOManager *m_vaoManager;
    ShaderManager *m_shaderManager;
    TechniqueManager *m_techniqueManager;
    EffectManager *m_effectManager;
    RenderPassManager *m_renderPassManager;
    TextureManager *m_textureManager;
    TextureDataManager *m_textureDataManager;
    LayerManager *m_layerManager;
    CriterionManager *m_criterionManager;
    FrameGraphManager *m_frameGraphManager;
    TransformManager *m_transformManager;
    RenderTargetManager *m_renderTargetManager;
    SceneManager *m_sceneManager;
    AttachmentManager *m_attachmentManager;
    SortCriterionManager *m_sortCriterionManager;
    ParameterManager *m_parameterManager;
    ShaderDataManager *m_shaderDataManager;
    UBOManager *m_uboManager;
    TextureImageManager *m_textureImageManager;
    BufferManager *m_bufferManager;
    AttributeManager *m_attributeManager;
    GeometryManager *m_geometryManager;
    GeometryRendererManager *m_geometryRendererManager;

    RenderQueue *m_renderQueue;
    QScopedPointer<RenderThread> m_renderThread;
    QScopedPointer<VSyncFrameAdvanceService> m_vsyncFrameAdvanceService;

    void buildDefaultMaterial();
    void buildDefaultTechnique();
    void loadSceneParsers();

    QMutex m_mutex;
    QSemaphore m_submitRenderViewsSemaphore;
    QWaitCondition m_waitForWindowToBeSetCondition;
    QWaitCondition m_waitForInitializationToBeCompleted;

    static void createThreadLocalAllocator(void *renderer);
    static void destroyThreadLocalAllocator(void *renderer);
    QThreadStorage<Qt3D::QFrameAllocator *> m_tlsAllocators;

    QAtomicInt m_running;

    QScopedPointer<QOpenGLDebugLogger> m_debugLogger;
    QList<AbstractSceneParser *> m_sceneParsers;
    QVector<Qt3D::QFrameAllocator *> m_allocators;

    QVector<Attribute *> m_dirtyAttributes;
    QVector<Geometry *> m_dirtyGeometry;
};

} // namespace Render
} // namespace Qt3DRender

QT_END_NAMESPACE

#endif // QT3DRENDER_RENDER_RENDERER_H