FilamentRenderer.h

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// -                        Open3D: www.open3d.org                            -
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// The MIT License (MIT)
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// Copyright (c) 2019 www.open3d.org
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// of this software and associated documentation files (the "Software"), to deal
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#pragma once

#include "Open3D/Visualization/Rendering/Renderer.h"

#include <filament/utils/Entity.h>
#include <memory>
#include <unordered_map>
#include <unordered_set>

namespace filament {
class Engine;
class Renderer;
class Scene;
class SwapChain;
class VertexBuffer;
}  // namespace filament

namespace open3d {
namespace visualization {

class FilamentMaterialModifier;
class FilamentRenderToBuffer;
class FilamentResourceManager;
class FilamentScene;
class FilamentView;

class FilamentRenderer : public Renderer {
public:
    FilamentRenderer(filament::Engine& engine,
                     void* native_drawable,
                     FilamentResourceManager& resource_mgr);
    ~FilamentRenderer() override;

    SceneHandle CreateScene() override;
    Scene* GetScene(const SceneHandle& id) const override;
    void DestroyScene(const SceneHandle& id) override;

    void UpdateSwapChain() override;

    void BeginFrame() override;
    void Draw() override;
    void EndFrame() override;

    MaterialHandle AddMaterial(const ResourceLoadRequest& request) override;
    MaterialInstanceHandle AddMaterialInstance(
            const MaterialHandle& material) override;
    MaterialInstanceHandle AddMaterialInstance(
            const geometry::TriangleMesh::Material& material) override;
    MaterialModifier& ModifyMaterial(const MaterialHandle& id) override;
    MaterialModifier& ModifyMaterial(const MaterialInstanceHandle& id) override;
    void RemoveMaterialInstance(const MaterialInstanceHandle& id) override;

    TextureHandle AddTexture(const ResourceLoadRequest& request) override;
    TextureHandle AddTexture(
            const std::shared_ptr<geometry::Image>& image) override;
    void RemoveTexture(const TextureHandle& id) override;

    IndirectLightHandle AddIndirectLight(
            const ResourceLoadRequest& request) override;
    void RemoveIndirectLight(const IndirectLightHandle& id) override;

    SkyboxHandle AddSkybox(const ResourceLoadRequest& request) override;
    void RemoveSkybox(const SkyboxHandle& id) override;

    std::shared_ptr<visualization::RenderToBuffer> CreateBufferRenderer()
            override;

    // Removes scene from scenes list and draws it last
    // WARNING: will destroy previous gui scene if there was any
    void ConvertToGuiScene(const SceneHandle& id);
    FilamentScene* GetGuiScene() const { return gui_scene_.get(); }

private:
    friend class FilamentRenderToBuffer;

    filament::Engine& engine_;
    filament::Renderer* renderer_ = nullptr;
    filament::SwapChain* swap_chain_ = nullptr;

    std::unordered_map<REHandle_abstract, std::unique_ptr<FilamentScene>>
            scenes_;
    std::unique_ptr<FilamentScene> gui_scene_;

    std::unique_ptr<FilamentMaterialModifier> materials_modifier_;
    FilamentResourceManager& resource_mgr_;

    std::unordered_set<FilamentRenderToBuffer*> buffer_renderers_;

    bool frame_started_ = false;

    void OnBufferRenderDestroyed(FilamentRenderToBuffer* render);
};

}  // namespace visualization
}  // namespace open3d