OpenSpace/modules/space/rendering/renderableconstellationlines.h

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 * OpenSpace                                                                             *
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#ifndef __OPENSPACE_MODULE_DIGITALUNIVERSE___RENDERABLECONSTELLATIONLINES___H__
#define __OPENSPACE_MODULE_DIGITALUNIVERSE___RENDERABLECONSTELLATIONLINES___H__

#include <modules/space/rendering/renderableconstellation.h>

#include <modules/space/speckloader.h>
#include <openspace/properties/optionproperty.h>
#include <openspace/properties/selectionproperty.h>
#include <openspace/properties/stringproperty.h>
#include <openspace/properties/scalar/boolproperty.h>
#include <openspace/properties/scalar/floatproperty.h>
#include <openspace/properties/vector/ivec2property.h>
#include <openspace/properties/vector/vec3property.h>
#include <openspace/util/distanceconversion.h>
#include <ghoul/opengl/ghoul_gl.h>
#include <ghoul/opengl/uniformcache.h>
#include <unordered_map>

namespace ghoul::filesystem { class File; }
namespace ghoul::fontrendering { class Font; }
namespace ghoul::opengl {
    class ProgramObject;
    class Texture;
} // namespace ghoul::opengl

namespace openspace {

namespace documentation { struct Documentation; }

class RenderableConstellationLines : public RenderableConstellation {
public:
    explicit RenderableConstellationLines(const ghoul::Dictionary& dictionary);
    ~RenderableConstellationLines() override = default;

    void initialize() override;
    void initializeGL() override;
    void deinitialize() override;
    void deinitializeGL() 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 MeshType {
        Solid = 0,
        Wire = 1,
        Point = 2,
        INVALID = 9
    };

    struct RenderingMesh {
        int meshIndex;
        int colorIndex;
        int textureIndex;
        // From: Partiview User's Guide
        // Brian Abbott
        // Hayden Planetarium American Museum of Natural History New York, USA
        // "Specifies the dimensions of the mesh"
        // "If you wish to draw a line between points, then numU will be 1 while
        // numV will equal the number of points to connect.
        // If you want a square, 4000×4000 grid with lines every 200 units,
        // then numU numV will both equal 21
        int numU;
        int numV;
        MeshType style;
        std::vector<GLuint> vaoArray;
        std::vector<GLuint> vboArray;
        std::vector<GLfloat> vertices;
        bool isEnabled = true;
        std::string identifier;
    };

    void createMeshes();
    void renderMeshes(const RenderData& data, const glm::dmat4& modelViewMatrix,
        const glm::dmat4& projectionMatrix);

    bool loadData();
    bool readSpeckFile();

    /**
     * Callback method that gets triggered when <code>_selectedMeshes</code>
     * changes.
     */
    void selectionPropertyHasChanged();

    bool _hasSpeckFile = false;
    bool _dataIsDirty = true;
    bool _textColorIsDirty = true;
    std::vector<std::string> _assetSelectedMeshes;

    properties::BoolProperty _drawElements;

    ghoul::opengl::ProgramObject* _program = nullptr;
    UniformCache(modelViewTransform, projectionTransform, alphaValue,
        color) _uniformCache;
    std::shared_ptr<ghoul::fontrendering::Font> _font = nullptr;

    std::string _speckFile;

    DistanceUnit _unit = DistanceUnit::Parsec;

    std::vector<float> _fullData;

    std::unordered_map<int, glm::vec3> _meshColorMap;
    std::unordered_map<int, RenderingMesh> _renderingMeshesMap;
};
} // namespace openspace

#endif // __OPENSPACE_MODULE_DIGITALUNIVERSE___RENDERABLECONSTELLATIONLINES___H__