OpenSpace/modules/digitaluniverse/rendering/renderablebillboardscloud.h

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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2017                                                               *
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#ifndef __OPENSPACE_MODULE_DIGITALUNIVERSE___RENDERABLEBILLBOARDSCLOUD___H__
#define __OPENSPACE_MODULE_DIGITALUNIVERSE___RENDERABLEBILLBOARDSCLOUD___H__

#include <openspace/rendering/renderable.h>

#include <openspace/properties/optionproperty.h>
#include <openspace/properties/stringproperty.h>
#include <openspace/properties/scalar/boolproperty.h>
#include <openspace/properties/scalar/floatproperty.h>
#include <openspace/properties/vector/vec3property.h>
#include <openspace/properties/vector/vec4property.h>

#include <ghoul/opengl/ghoul_gl.h>
#include <ghoul/font/fontrenderer.h>

#include <functional>
#include <unordered_map>

namespace ghoul::filesystem { 
    class File; 
}

namespace ghoul::opengl {
    class ProgramObject;
    class Texture;
} // namespace ghoul::opengl

namespace openspace {

namespace documentation { struct Documentation; }

class RenderableBillboardsCloud : public Renderable {
public:
    explicit RenderableBillboardsCloud(const ghoul::Dictionary& dictionary);
    ~RenderableBillboardsCloud() = default;

    void initialize() override;
    void deinitialize() override;

    bool isReady() const override;

    void render(const RenderData& data, RendererTasks& rendererTask) override;
    void update(const UpdateData& data) override;

    static documentation::Documentation Documentation();

private:

    enum Unit {
        Meter = 0,
        Kilometer = 1,
        Parsec = 2,
        Kiloparsec = 3,
        Megaparsec = 4,
        Gigaparsec = 5,

        GigalightYears = 6
    };

    void createDataSlice();
    void createPolygonTexture();
    void renderToTexture(std::function<void(void)> geometryLoadingFunction,
        std::function<void(GLuint)> renderFunction,
        GLuint textureToRenderTo, GLuint textureWidth, GLuint textureHeight);
    void loadPolygonGeometryForRendering();
    void renderPolygonGeometry(GLuint vao);
    void renderBillboards(const RenderData& data, const glm::dmat4& modelViewMatrix,
        const glm::dmat4& projectionMatrix, const glm::vec3& orthoRight, const glm::vec3& orthoUp,
        const float fadeInVariable);
    void renderLabels(const RenderData& data, const glm::dmat4& modelViewProjectionMatrix, 
        const glm::vec3& orthoRight, const glm::vec3& orthoUp, const float fadeInVariable);

    bool loadData();
    bool readSpeckFile();
    bool readColorMapFile();
    bool readLabelFile();
    bool loadCachedFile(const std::string& file);
    bool saveCachedFile(const std::string& file) const;

    bool _hasSpeckFile;
    bool _dataIsDirty;
    bool _textColorIsDirty;
    bool _hasSpriteTexture;
    bool _spriteTextureIsDirty;
    bool _hasColorMapFile;
    bool _hasPolygon;
    bool _hasLabel;
    bool _labelDataIsDirty;

    int _polygonSides;

    GLuint _pTexture;

    properties::FloatProperty _alphaValue;
    properties::FloatProperty _scaleFactor;
    properties::Vec3Property _pointColor;
    properties::StringProperty _spriteTexturePath;
    properties::Vec4Property _textColor;
    properties::FloatProperty _textSize;
    properties::FloatProperty _textMinSize;
    properties::BoolProperty _drawElements;
    properties::BoolProperty _drawLabels;
    properties::OptionProperty _colorOption;
    properties::FloatProperty _fadeInDistance;
    properties::BoolProperty _disableFadeInDistance;
    properties::FloatProperty _billboardMaxSize;

    // DEBUG:
    properties::OptionProperty _renderOption;


    std::unique_ptr<ghoul::opengl::Texture> _polygonTexture;
    std::unique_ptr<ghoul::opengl::Texture> _spriteTexture;
    std::unique_ptr<ghoul::filesystem::File> _spriteTextureFile;
    std::unique_ptr<ghoul::opengl::ProgramObject> _program;
    std::unique_ptr<ghoul::fontrendering::FontRenderer> _fontRenderer;        
    std::shared_ptr<ghoul::fontrendering::Font> _font;

    std::string _speckFile;
    std::string _colorMapFile;
    std::string _labelFile;
    std::string _colorOptionString;

    Unit _unit;

    std::vector<float> _slicedData;
    std::vector<float> _fullData;
    std::vector<glm::vec4> _colorMapData;
    std::vector<std::pair<glm::vec3, std::string>> _labelData;
    std::unordered_map<std::string, int> _variableDataPositionMap;
    std::unordered_map<int, std::string> _optionConversionMap;
    std::vector<glm::vec2> _colorRangeData;
    
    int _nValuesPerAstronomicalObject;

    glm::dmat4 _transformationMatrix;

    GLuint _vao;
    GLuint _vbo;

    // For polygons
    GLuint _polygonVao;
    GLuint _polygonVbo;
};


} // namespace openspace

#endif // __OPENSPACE_MODULE_DIGITALUNIVERSE___RENDERABLEBILLBOARDSCLOUD___H__