AbsoluteTransform.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_ABSOLUTE_TRANSFORM_H
#define META_OCEAN_RENDERING_ABSOLUTE_TRANSFORM_H
 
#include "ocean/rendering/Rendering.h"
#include "ocean/rendering/Group.h"
 
namespace Ocean
{
 
namespace Rendering
{
 
// Forward declaration
class AbsoluteTransform;
 
/**
 * Definition of a smart object reference holding a transform node.
 * @see SmartObjectRef, AbsoluteTransform.
 * @ingroup rendering
 */
typedef SmartObjectRef<AbsoluteTransform> AbsoluteTransformRef;
 
/**
 * This class is the base class for all absolute transform nodes.
 * An absolute transformation provides an own and explicit transformation independent form parent nodes.
 * @ingroup rendering
 */
class OCEAN_RENDERING_EXPORT AbsoluteTransform : virtual public Group
{
    public:
 
        /**
         * Defines different transformation types.
         */
        enum TransformationType
        {
            /// Transformation with no explicit absolute coordinate system
            TT_NONE,
            /// Transformation which is defined in relation to the view.
            TT_VIEW,
            /// Transformation providing an explicit coordinate system for head-up objects.
            TT_HEAD_UP
        };
 
    public:
 
        /**
         * Returns the current transfomation type.
         * Default is TT_NONE.
         * @return Transformation type
         * @exception NotSupportedException Is thrown if this function is not supported
         */
        virtual TransformationType transformationType() const;
 
        /**
         * Returns the relative screen position of the head-up node.
         * The default value is (0.5, 0.5)
         * @return Relative screen position, with range [0.0, 1.0] for each axis, -1.0 neglects this definition
         * @exception NotSupportedException Is thrown if this function is not supported
         * @see setHeadUpRelativePosition().
         */
        virtual Vector2 headUpRelativePosition() const;
 
        /**
         * Returns the transformation which is applied on top of the absolute transformation.
         * @return The transformation between all child nodes and the absolute transformation (absolute_T_children)
         */
        virtual HomogenousMatrix4 transformation() const = 0;
 
        /**
         * Sets or changes the transfomation type.
         * Default is TT_NONE.
         * @param type Transformation type to set
         * @return True, if succeeded
         * @exception NotSupportedException Is thrown if this function is not supported
         */
        virtual bool setTransformationType(const TransformationType type);
 
        /**
         * Sets the relative screen position of the head-up node.
         * @param position Relative screen position, with range [0.0, 1.0] for each axis, -1.0 neglects this definition
         * @return True, if succeeded
         * @exception NotSupportedException Is thrown if this function is not supported
         * @see headUpRelativePosition().
         */
        virtual bool setHeadUpRelativePosition(const Vector2& position);
 
        /**
         * Sets an additional transformation which is applied on top of the absolute transformation.
         * @param absolute_T_children The transformation between all child nodes and the absolute transformation, must be valid
         */
        virtual void setTransformation(const HomogenousMatrix4& absolute_T_children) = 0;
 
        /**
         * Returns the type of this object.
         * @see Object::type().
         */
        ObjectType type() const override;
 
    protected:
 
        /**
         * Creates a new absolute transform node.
         */
        AbsoluteTransform();
 
        /**
         * Destructs an absolute transform node.
         */
        ~AbsoluteTransform() override;
};
 
}
 
}
 
#endif // META_OCEAN_RENDERING_ABSOLUTE_TRANSFORM_H