gls_eyepoint.h

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/*! \file
  \brief  The disti::GlsEyePoint class.  Implements eyepoints.

  \par Copyright Information

  Copyright (c) 2015 by The DiSTI Corporation.<br>
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  <br>
  All rights reserved.<br>

  This Software contains proprietary trade secrets of DiSTI and may not be
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  NO WARRANTY. THE SOFTWARE IS PROVIDED "AS-IS," WITHOUT WARRANTY OF ANY KIND,
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  LIMITATION OF LIABILITY. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW,
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*/
#ifndef _GLS_EYEPOINT_H
#define _GLS_EYEPOINT_H

#include "display.h"
#include "gls_color.h"
#include "gls_include.h"
#include "disti_metadata.h"
#include "gls_metadata_attributes.h"
#include "gls_cpp_lang_support.h"

namespace disti
{

/**
    Eye Point Initializers
*/
typedef enum 
{
    GLS_EYEPOINT_FOV  = GLS_LAST_INITIALIZER+1,
    GLS_EYEPOINT_ORTHOGRAPHIC,
    GLS_EYEPOINT_ORTHO_SIZE,
    GLS_EYEPOINT_FOV_IS_HORIZONTAL,
    GLS_EYEPOINT_ASPECT,
    GLS_EYEPOINT_NEAR_CLIP,
    GLS_EYEPOINT_FAR_CLIP,
    GLS_EYEPOINT_MAINTAIN_ASPECT,
    GLS_EYEPOINT_VIEW_VECTORS
} GLS_EyePoint_Initializers;

class GlsEyePoint;

/** Eye Point Calc View Callback Base */
class EyePointCalcViewCallbackBase
{
public:
    virtual ~EyePointCalcViewCallbackBase() {}
    virtual void Call(int viewWidth, 
                 int viewHeight, 
                 GlsEyePoint* thisEye,
                 double& rval1,
                 double& rval2) = 0;
};
template <class T>
/** Eye Point Calc View Callback */
class EyePointCalcViewCallback : public EyePointCalcViewCallbackBase
{
public:
    typedef void (T::*MethodType)(
                    int viewWidth, 
                    int viewHeight, 
                    GlsEyePoint* thisEye,
                    double& rval1,
                    double& rval2);
    // The object which contains the method to call
    T* _container;
    MethodType _method;

    EyePointCalcViewCallback(T* container, MethodType method) : 
        _container(container),
        _method(method)
    {
    }
    void Call(int viewWidth, 
             int viewHeight, 
             GlsEyePoint* thisEye,
             double& rval1,
             double& rval2)
    {
        if (_container) 
          (_container->*(_method))(viewWidth, viewHeight, thisEye, rval1, rval2);
    }
};
/**
  The GlsEyePoint class.  Implements Eyepoints
*/
class GlsEyePoint : public DisplayObject
{
public:
    typedef DisplayObject _BaseClass;
    friend class GlsEyePointEditor;

    typedef enum {
        FOV_CONSTRAINT_NONE,
        FOV_CONSTRAINT_GREATER,
        FOV_CONSTRAINT_LESS,
        FOV_CONSTRAINT_EXACTLY } FovConstraintType;

private:

    static bool _drawDebugGeometry; /** Causes eyepoints to draw debugging geometry.  Defaults to false. */

protected:


    double _fov;            /** Field of view of eyepoint in Degrees, if _fovIsHorizontal is true, this is horizontal */
    double _otherFov;       /** Field of view for the other direction, based on _fovIsHorizontal */
    bool _orthographic;     /** True if orthographic projection, else perspective projection */
    double _orthoSize;      /** Size of ortho projection in logical units, if _fovIsHorizontal is true, this is horizontal */
    double _otherOrthoSize; /** Size of ortho projection for the other direction, based on _fovIsHorizontal */
    bool  _fovIsHorizontal; /** True if field of view measurement is along horizonal axis, else along vertical axis */
    FovConstraintType _horizontalConstraint; /** The type of constraint in the horizontal direction */
    FovConstraintType _verticalConstraint;   /** The type of constraint in the vertical direction */
    double _nearClip;       /** Distance from eyepoint to near clipping plane */
    double _farClip;        /** Distance from eyepoint to far clipping plane */
    Vector _viewVectors[3]; /** 3 vectors used to set the orientation of the eyepoint */

    EyePointCalcViewCallbackBase* _alternateCalcOrthographicView; /** Alternate callback for calculating the orthographic view */
    EyePointCalcViewCallbackBase* _alternateCalcPerspectiveView;  /** Alternate callback for calculating the perspective view */

#ifdef GLES
    /** Set a single attribute from the GLO file.
     * \param data The attribute to set and its associated data.
     */
    virtual GLS_EXPORT void SetFromGloData(GlsGloFileAttribute &data);
#endif

public:

    /** Set DrawDebugGeometry to true to cause eyepoints to draw at runtime.
      * This affects all eyepoint instances.
      */
    static GLS_EXPORT void DrawDebugGeometry(bool draw) {_drawDebugGeometry = draw; }

    /* See base class */
    virtual GLS_EXPORT DisplayObject *CloneObject(bool generateNames = false);

    /** Allocate a (blank) EyePoint object */
    GLS_EXPORT GlsEyePoint();

    /** The copy constructor for GlsEyePoint
      * 
      * \param that          The GlsEyePoint object that is being copied
      * \param generateNames Whether or not to generate a new instance name
      */
    GLS_EXPORT GlsEyePoint( const GlsEyePoint& that, const bool generateNames );

    /** Destroy an Eyepoint object */
    virtual GLS_EXPORT ~GlsEyePoint(void);

    virtual GLS_EXPORT void SetAvailableAttributes(unsigned int value);

    /** Draws does nothing because this object is not a visible object,
      * unless DrawDebugGeometry() is true, then it draws the view frustum. */
    virtual GLS_EXPORT void Draw(void);

#ifndef GLES
    /** Draws a representation of the frustum.  This is done primarily for the editor.
      * but is available at runtime.  The specific values can be specified to avoid
      * making the editor set them and set them back.*/
    virtual GLS_EXPORT void DrawFrustum(
           bool selected,
           bool orthographic,
           bool fovIsHorizontal,
           double orthoSize,
           double otherOrthoSize,
           double fov,
           double otherFov,
           FovConstraintType horizontalConstraint,
           FovConstraintType verticalConstraint,
           double farClip,
           double nearClip);
#endif

    /* See base class */
    virtual GLS_EXPORT void CopyGeometry(DisplayObject *src);

    /* See base class */
    virtual GLS_EXPORT void CopyProperties(DisplayObject *src);

#ifndef GLES
    /* See base class */
    virtual GLS_EXPORT InterfaceListType* GetCppInterfaceDescription(InterfaceListType* addToThisList);

    /* See base class */
    virtual GLS_EXPORT void GetCppInterfaceDescriptionFree(InterfaceListType* list);
#endif

    /* Unhides base class implementation. */
    using _BaseClass::Rotate;

    /* See base class */
    virtual GLS_EXPORT void Rotate(const Vector &orig,float angle,const Vector &axis);

    /* See base class */
    virtual GLS_EXPORT void SetValue(int spec,va_list &args);

    /** Sets the Field Of View for this eyepoint.
      * If FovIsHorizontal, this is the horizontal fov.
      * \param fovDeg  The new field of view, in degrees
      */
    GLS_EXPORT void FOV(double fovDeg);

    /** Sets the Field Of View for this eyepoint.
      * If FovIsHorizontal, this is the vertical fov.
      * \param fovDeg  The new field of view, in degrees
      */
    GLS_EXPORT void OtherFOV(double fovDeg);

    /** Sets whether or not the field of view measurement is along horizontal or vertical axis
      * \param val  True if FOV measurement is along horizonal axis of eyepoint
      */
    GLS_EXPORT void FovIsHorizontal(bool val);

    /** Sets whether the eyepoint uses an orthographic projection or a perspective projection
      * \param val  True if the eypoint uses an orthographic projection.  False if it uses a perspective projection.
      */
    GLS_EXPORT void Orthographic(bool val);

    /** Sets the size of the orthographic projection, in logical units.  
      * The direction this controls is set by FovIsHorizontal.  If true, it is horizontal.
      * \param val The size of the orthographic projection, in logical units
      */
    GLS_EXPORT void OrthoSize(double val);

    /** Sets the size of the orthographic projection, in logical units.  
      * The direction this controls is set by FovIsHorizontal.  If true, it is vertical.
      * \param val The size of the orthographic projection, in logical units
      */
    GLS_EXPORT void OtherOrthoSize(double val);

    /** Sets the distance to the near clipping plane from the eyepoint
      * \param val  Distance to the near clipping plane from the eyepoint in logical units
      */
    GLS_EXPORT void NearClip(double val);

    /** Sets the distance to the far clipping plane from the eyepoint
      * \param val  Distance to the far clipping plane from the eyepoint in logical units
      */
    GLS_EXPORT void FarClip(double val);

    /** Sets the constraint for the horizontal direction
      */
    GLS_EXPORT void HorizontalConstraint(FovConstraintType val);

    /** Sets the constraint for the vertical direction
      */
    GLS_EXPORT void VerticalConstraint(FovConstraintType val);

    /** Allows the view vectors to be set directly.  
      * These are normally controlled by the Orientation call
      */
    GLS_EXPORT void SetViewVectors(const Vector& x, const Vector& y, const Vector& z);

    /** Gets the Field Of View for this eyepoint.  
      * If FovIsHorizontal is true, this is the horizontal fov.
      * \return  The field of view, in degrees
      */
    GLS_EXPORT double FOV(void);

    /** Gets the Field Of View for this eyepoint.  
      * If FovIsHorizontal is true, this is the vertical fov.
      * \return  The field of view, in degrees
      */
    GLS_EXPORT double OtherFOV(void);

    /** Gets whether or not the field of view measurement is along horizontal or vertical axis
      * \return True if FOV measurement is along horizonal axis of eyepoint
      */
    GLS_EXPORT bool FovIsHorizontal(void);

    /** Gets whether the eyepoint uses an orthographic projection or a perspective projection
      * \return  True if the eypoint uses an orthographic projection.  False if it uses a perspective projection.
      */
    GLS_EXPORT bool Orthographic(void);

    /** Sets the size of the orthographic projection, in logical units.  
      * The direction this returns is set by FovIsHorizontal.  If true, it is horizontal.
      */
    GLS_EXPORT double OrthoSize(void);

    /** Sets the size of the orthographic projection, in logical units.  
      * The direction this returns is set by FovIsHorizontal.  If true, it is vertical.
      */
    GLS_EXPORT double OtherOrthoSize(void);

    /** Gets the distance to the near clipping plane from the eyepoint
      * \return  Distance to the near clipping plane from the eyepoint in logical units
      */
    GLS_EXPORT double NearClip(void);

    /** Gets the distance to the far clipping plane from the eyepoint
      * \return  Distance to the far clipping plane from the eyepoint in logical units
      */   
    GLS_EXPORT double FarClip(void);

    /** Gets the constraint for the horizontal direction
      */
    GLS_EXPORT FovConstraintType HorizontalConstraint(void);

    /** Gets the constraint for the vertical direction
      */
    GLS_EXPORT FovConstraintType VerticalConstraint(void);

    /** Returns the current view vectors.
      */
    GLS_EXPORT void GetViewVectors(Vector& x, Vector& y, Vector& z);

    /** Sets the orientation of the eyepoint
      * \param direction  A direction vector
      * \param roll  A roll value about the direction vector, in degrees
      * \param upVector defines the "up" direction for the purposes of calculating roll.
      */
    GLS_EXPORT void Orientation(const Vector &direction, float roll, const Vector& upVector = Vector(0,1,0)/* Y Axis */);

    /** Gets the current direction vector of the eyepoint
      * \return The direction vector
      */
    GLS_EXPORT Vector Direction(void);

    /** Gets the current roll angle of the eyepoint
      * \return The current roll
      * \param upVector The "up" direction used for determining roll.
      */
    GLS_EXPORT float Roll(const Vector upVector = Vector(0,1,0)/* Y Axis */);

    /** Called by ApplyViewMatrices() to do the sizing logic 
      */
    virtual GLS_EXPORT void CalcOrthographicView(
                                int viewWidth, 
                                int viewHeight, 
                                GlsEyePoint* thisEye,
                                double& fovY,
                                double& aspect);

    /** Called by ApplyViewMatrices() to do the sizing logic 
      */
    virtual GLS_EXPORT void CalcPerspectiveView(
                                int viewWidth, 
                                int viewHeight, 
                                GlsEyePoint* thisEye,
                                double& fovY,
                                double& aspect);

#ifdef GLES
    /** Calculates and applies the projection and modelview matrices for this eyepoint
     * \param proj   The projection matrix (returned)
     * \param modelView  The modelview matrix (returned)
     * \param width  The current view width
     * \param height  The current view height
     */
    virtual GLS_EXPORT void ApplyViewMatrices(GlsMatrixType &proj,GlsMatrixType &modelView,int width,int height);
#else
    /** Calculates and applies the projection and modelview matrices for this eyepoint */
    virtual GLS_EXPORT void ApplyViewMatrices(void);
#endif

    /** Returns the modelview matrix for this eyepoint.
      * \param modelview Output
      * \param includeEyeToWorld If true, will include all transforms up to the top of the hierarcy.
      */
    virtual GLS_EXPORT void GetModelViewMatrix(GlsMatrixType& modelview, bool includeEyeToWorld = true);
    /** Returns the projection matrix for this eyepoint
      * \param proj The requested projection matrix
      * \param viewW The width of the view in pixels
      * \param viewH The height of the view in pixels
      */
    virtual GLS_EXPORT void GetProjectionMatrix(GlsMatrixType& proj, int viewW, int viewH);
    
    template <class T>
    static void SetAlternateCalcOrthographicView(GlsEyePoint* eye, T* container, typename EyePointCalcViewCallback<T>::MethodType method)
    {
        if (!eye)
            return;
        if (eye->_alternateCalcOrthographicView)
            delete eye->_alternateCalcOrthographicView;
        eye->_alternateCalcOrthographicView = new EyePointCalcViewCallback<T>(container, method);
    }
    template <class T>
    static void SetAlternateCalcPerspectiveView(GlsEyePoint* eye, T* container, typename EyePointCalcViewCallback<T>::MethodType method)
    {
        if (!eye)
            return;
        if (eye->_alternateCalcPerspectiveView)
            delete eye->_alternateCalcPerspectiveView;
        eye->_alternateCalcPerspectiveView = new EyePointCalcViewCallback<T>(container, method);
    }

   

private:
    // Returns the 16 doubles representing the ModelView matrix
    // Must set with bool_includeEyeToWorld before reading
    GLS_EXPORT GlsPropString GetModelViewMatrix();
    GLS_EXPORT void GetModelViewMatrix(const GlsPropString& bool_includeEyeToWorld);
    bool _getModelViewMatrixIncludeEyeToWorld;

    // Returns the 16 doubles representing the Projection matrix
    // Must set with int_width_height before reading
    GLS_EXPORT GlsPropString GetProjectionMatrix();
    GLS_EXPORT void GetProjectionMatrix(const GlsPropString& int_width_height);
    int _getProjectionMatrixWidth;
    int _getProjectionMatrixHeight;

    /** Assignment operator not implemented. Use CloneObject() or the copy constructor instead. */
    GlsEyePoint& operator=( const GlsEyePoint& that ) DISTI_SPECIAL_MEM_FUN_DELETE;
    GlsEyePoint( const GlsEyePoint& ) DISTI_SPECIAL_MEM_FUN_DELETE;

};

///////////////////////////////////////////////////////////
// DistiAttributeFovConstraintTypeEnum
///////////////////////////////////////////////////////////
/** Disti Attribute Fov Constrain tType Enum */
class DistiAttributeFovConstraintTypeEnum : public DistiAttributeEnum<GlsEyePoint,GlsEyePoint::FovConstraintType,GlsEyePoint::FovConstraintType>
{
public:
    GLS_EXPORT DistiAttributeFovConstraintTypeEnum(GlsEyePoint* frame,SetMethodType setMethod, GetMethodType getMethod,const AttributeName &name);
    virtual GLS_EXPORT ~DistiAttributeFovConstraintTypeEnum();
};


} // namespace disti

#endif