PerspectiveView.h

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/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
 
#ifndef META_OCEAN_RENDERING_PERSPECTIVE_VIEW_H
#define META_OCEAN_RENDERING_PERSPECTIVE_VIEW_H
 
#include "ocean/rendering/Rendering.h"
#include "ocean/rendering/View.h"
 
#include "ocean/math/SquareMatrix4.h"
 
namespace Ocean
{
 
namespace Rendering
{
 
// Forward declaration
class PerspectiveView;
 
/**
 * Definition of a smart object reference holding a perspective view node.
 * @see SmartObjectRef, PerspectiveView.
 * @ingroup rendering
 */
typedef SmartObjectRef<PerspectiveView> PerspectiveViewRef;
 
/**
 * This class is the base class for all perspective views.
 * @ingroup rendering
 */
class OCEAN_RENDERING_EXPORT PerspectiveView : virtual public View
{
    public:
 
        /**
         * Returns the horizontal field of view in radian.
         * @return Horizontal field of view in radian, with range (0, PI)
         * @exception NotSupportedException Is thrown if this function is not supported
         */
        virtual Scalar fovX() const;
 
        /**
         * Sets the horizontal field of view in radian.
         * @param fovx Horizontal field of view in radian, with range (0, PI)
         * @return True, if the value is valid and could be set
         * @exception NotSupportedException Is thrown if this function is not supported
         */
        virtual bool setFovX(const Scalar fovx);
 
        /**
         * Calculates the ideal field of view matching to the current background.
         * If the background holds a medium and no valid frame has been provided by this medium jet this function will return the view's field of view.
         * @param validCamera Optional resulting state determining whether the background had a valid camera object
         * @return Resulting field of view in radian
         */
        virtual Scalar idealFovX(bool* validCamera = nullptr) const;
 
        /**
         * Updates the view's field of view to the ideal field of view matching with the current background.
         */
        virtual void updateToIdealFovX();
 
        /**
         * Sets the projection matrix explicitly.
         * @param clip_T_view The projection matrix to set
         * @exception NotSupportedException Is thrown if this function is not supported
         */
        virtual void setProjectionMatrix(const SquareMatrix4& clip_T_view);
 
        /**
         * Fits the camera to a given node.
         * @see View::fitCamera().
         */
        void fitCamera(const NodeRef& node = NodeRef()) override;
 
        /**
         * Returns the type of this object.
         * @see Object::type().
         */
        ObjectType type() const override;
 
    protected:
 
        /**
         * Creates a new perspective view object.
         */
        PerspectiveView();
 
        /**
         * Destructs a perspective view object.
         */
        ~PerspectiveView() override;
};
 
}
 
}
 
#endif // META_OCEAN_RENDERING_PERSPECTIVE_VIEW_H