OpenSpace/include/openspace/rendering/renderable.h

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 *                                                                                       *
 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2023                                                               *
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#ifndef __OPENSPACE_CORE___RENDERABLE___H__
#define __OPENSPACE_CORE___RENDERABLE___H__

#include <openspace/properties/propertyowner.h>

#include <openspace/properties/scalar/boolproperty.h>
#include <openspace/properties/scalar/doubleproperty.h>
#include <openspace/properties/scalar/floatproperty.h>
#include <openspace/properties/stringproperty.h>
#include <openspace/scene/scenegraphnode.h>
#include <ghoul/misc/managedmemoryuniqueptr.h>

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

namespace openspace {

struct RenderData;
struct UpdateData;
struct RendererTasks;
struct SurfacePositionHandle;

namespace documentation { struct Documentation; }

class Camera;

class Renderable : public properties::PropertyOwner {
public:
    enum class RenderBin : int {
        Background = 1,
        Opaque = 2,
        PreDeferredTransparent = 4,
        Overlay = 8,
        PostDeferredTransparent = 16,
        Sticker = 32
    };

    static ghoul::mm_unique_ptr<Renderable> createFromDictionary(
        ghoul::Dictionary dictionary);

    Renderable(const ghoul::Dictionary& dictionary);
    virtual ~Renderable() override = default;

    virtual void initialize();
    virtual void initializeGL();
    virtual void deinitialize();
    virtual void deinitializeGL();

    virtual bool isReady() const = 0;
    bool isEnabled() const;
    bool shouldUpdateIfDisabled() const;

    double boundingSphere() const;
    double interactionSphere() const;

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

    // The 'surface' in this case is the interaction sphere of this renderable. In some
    // cases (i.e., planets) this corresponds directly to the physical surface, but in
    // many cases, models, volumetric data, this will not. Regardless of what the physical
    // representation is, the 'surface' is always the sphere around which interaction is
    // handled
    virtual SurfacePositionHandle calculateSurfacePositionHandle(
                                                const glm::dvec3& targetModelSpace) const;

    virtual bool renderedWithDesiredData() const;

    RenderBin renderBin() const;
    void setRenderBin(RenderBin bin);
    bool matchesRenderBinMask(int binMask);

    void setFade(float fade);

    bool isVisible() const;

    void onEnabledChange(std::function<void(bool)> callback);

    static documentation::Documentation Documentation();

protected:
    properties::BoolProperty _enabled;
    properties::FloatProperty _opacity;
    properties::FloatProperty _fade;
    properties::StringProperty _renderableType;
    properties::BoolProperty _dimInAtmosphere;

    void setBoundingSphere(double boundingSphere);
    void setInteractionSphere(double interactionSphere);

    void setRenderBinFromOpacity();
    void registerUpdateRenderBinFromOpacity();

    /// Returns the full opacity constructed from the _opacity and _fade property values
    float opacity() const;

    double _boundingSphere = 0.0;
    double _interactionSphere = 0.0;
    SceneGraphNode* _parent = nullptr;
    bool _shouldUpdateIfDisabled = false;
    RenderBin _renderBin = RenderBin::Opaque;

private:
    // We only want the SceneGraphNode to be able manipulate the parent, so we don't want
    // to provide a set method for this. Otherwise, anyone might mess around with our
    // parentage and that's no bueno
    friend ghoul::mm_unique_ptr<SceneGraphNode> SceneGraphNode::createFromDictionary(
        const ghoul::Dictionary&);
};

} // namespace openspace

#endif // __OPENSPACE_CORE___RENDERABLE___H__