diguyGraphicsLink.h

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/****************************************************************************
 * Copyright (c) 2023 MAK Technologies, Inc.
 * All rights reserved.
 ****************************************************************************/

/*********************************************************************/
#pragma once

#ifdef SWIG
%module diguyGraphicsLink
#else
#define CPLUSPLUS_ONLY
#endif

#ifdef CPLUSPLUS_ONLY
#include <diguy_constants.h>

class bdiLink;
class diguyCharacter;
class diguyGraphicsLink;
class diguyGraphicsShape;
class diguyGraphicsShaderInstance;


#endif

#include <declspec_diguy.h>

//------------------------------------------------------------------------------        
class BDI_DECLSPEC_diguy diguyGraphicsLink
{

public:

/*****************************************************************************/
        /*l
         *b  Description:
         **
         **    Returns the name of the link.  This pointer will never be NULL.
         **
         *b  Returns:
         **
         **    name of the link
         */
        const char* get_name();

        /*l
         *b  Description:
         **
         **    All links are assigned a unique identifier, or uid.  This
         **    function returns this links's uid.
         **
         **    *Note*: unique identifiers will change between DI-Guy runs!
         **
         *b  Returns:
         **
         **    unique identifier of object
         */
        long get_uid();

        /*l
         *b  Returns:
         **
         **    index of the link
         */
        int get_index();

        /*l
         *b  Description:
         **
         **    Returns a pointer to the diguyCharacter to which this link belongs.
         */
        diguyCharacter* get_character();

        /*l
         *b  Returns:
         **
         **    number of shapes on this link
         */
        int get_num_shapes();

        /*l
         *b  Returns:
         **
         **    pointer of type diguyGraphicsShape; NULL if no shape at the
         **    specified index
         **
         *b  Arguments:
         **
         *a    index - index of the shape; indices start at 0
         */
        diguyGraphicsShape* get_shape_at_index(int index);

        /*l
         *b  Description:
         **
         **    This function returns a pointer to the specified shape.
         **
         *b  Arguments:
         **
         *a    name    - name of link to be found
         **
         *b  Returns:
         **
         **    pointer of type diguyGraphicsShape; NULL if not found
         */
        diguyGraphicsShape* find_shape(const char* name);

        /*l
         *b  Description:
         **
         **    This function returns a pointer to the specified shape.
         **
         *b  Arguments:
         **
         *a    name - name of shape with class_type to be found,
         *a           currently works with heads
         **
         *b  Returns:
         **
         **    pointer of type diguyGraphicsShape; NULL if not found
         */
        diguyGraphicsShape* find_shape_by_class_type(const char* name);

        /*l
        *b  Description:
        **
        **    This function overrides the motion data driving the visibility child shapes
        **
        *b  Arguments:
        **
        *a    switch_name - the name of the motion data stream that controls the visibility
        *a                  of a child shape, see also get_switch_var_name(), set to -1 to 
        *a                  allow the underlying motion data to resume control
        **
        */
        void set_shape_switch_override(const char * switch_name, int value);

        /*l
         *b  Description:
         **
         **    Returns the type of joint that attaches this link to its parent.
         **
         *b  Returns:
         **
         **    joint type of the link
         */
        diguyGraphicsJointType get_joint_type();

        /*l
         *b  Description:
         **
         **    Returns in the passed variables the translation amount of the
         **    link's joint.
         **
         **    If there is a current render camera set, the position link's
         **    values will be in the local space of the camera. This is useful
         **    for rendering far from the origin.
         **
         **    The values may or may not stay constant frame to frame; see
         **    get_translation_is_static().
         **
         **    Returned values are in meters, and should be applied after the
         **    rotational offset (if any).
         **
         *b  Arguments:
         **
         *a    tx, ty, tz - pointers to floats into which result should be placed
         **
         *b  Returns:
         **
         **    0 on success, -1 on failure
         */
        int get_translation(float* tx, float* ty, float* tz);

        /*l
         *b  Description:
         **
         **    Returns in the passed variables the translation amount of the
         **    link's joint.
         **
         **    The values may or may not stay constant frame to frame; see
         **    get_translation_is_static().
         **
         **    Returned values are in meters, and should be applied after the
         **    rotational offset (if any).
         **
         *b  Arguments:
         **
         *a    tx, ty, tz - pointers to doubles into which result
         *a                 should be placed
         **
         *b  Returns:
         **
         **    0 on success, -1 on failure
         */
        int get_translation_double(double* tx, double* ty, double* tz);

        /*l
         *b  Description:
         **
         **    Returns whether the translation returned by get_translation() is
         **    static (unchanging) or dynamic (can change frame to frame).
         **
         **    If the translation is dynamic the translation values will come
         **    from one or more DI-Guy motion variables; the names of the
         **    variables are accessible using the functions get_var_name_tx(),
         **    etc.
         **
         **    If the translation is static it will remain so; the value returned
         **    by this function should not change frame to frame.
         **
         *b  Returns:
         **
         **    1 if translation is static, 0 if not, -1 on failure
         */
        int get_translation_is_static();

        
        /*l
         *b  Description:
         **
         **    Returns in the passed variables the initial translation amount of the
         **    link's joint.
         **
         **    This value is static and typically represents the offset to the parent link
         **
         **    Returned values are in meters
         **
         *b  Arguments:
         **
         *a    tx, ty, tz - pointers to floats into which result should be placed
         **
         *b  Returns:
         **
         **    0 on success, -1 on failure
         */
        int get_initial_translation(float* tx, float* ty, float* tz);

        /*l
         *b  Description:
         **
         **    Returns the name of the DI-Guy motion data variable that controls
         **    translation along the X axis.
         **
         **    The returned pointer will be NULL if there is no associated variable.
         **
         *b  Returns:
         **
         **    name of the variable; NULL if there is no variable
         */
        const char* get_var_name_tx();

        /*l
         *b  Description:
         **
         **    Returns the name of the DI-Guy motion data variable that controls
         **    translation along the Y axis.
         **
         **    The returned pointer will be NULL if there is no associated variable.
         **
         *b  Returns:
         **
         **    name of the variable; NULL if there is no variable
         */
        const char* get_var_name_ty();

        /*l
         *b  Description:
         **
         **    Returns the name of the DI-Guy motion data variable that controls
         **    translation along the Z axis.
         **
         **    The returned pointer will be NULL if there is no associated variable.
         **
         *b  Returns:
         **
         **    name of the variable; NULL if there is no variable
         */
        const char* get_var_name_tz();

        /*l
         *b  Description:
         **
         **    Returns in the passed variables the rotation amount of the link's
         **    joint.
         **
         **    The values may or may not stay constant frame to frame; see
         **    get_rotation_is_static().
         **
         **    Returned values are an Euler triple in degrees, and should be
         **    applied in RZ -> RX -> RY order, after the translation.
         **
         *b  Arguments:
         **
         *a    rz, rx, ry - pointers to floats into which result
         *a                 should be placed
         **
         *b  Returns:
         **
         **    0 on success, -1 on failure
         */
        int get_rotation(float* rz, float* rx, float* ry);

        /*l
         *b  Description:
         **
         **    Returns in the passed variables the rotation amount of the link's
         **    joint.
         **
         **    The values may or may not stay constant frame to frame; see
         **    get_rotation_is_static().
         **
         **    Returned values are an Euler triple in degrees, and should be
         **    applied in RZ -> RX -> RY order, after the translation.
         **
         *b  Arguments:
         **
         *a    rz, rx, ry - pointers to floats into which result
         *a                 should be placed
         **
         *b  Returns:
         **
         **    0 on success, -1 on failure
         */
        int get_rotation_euler(float* rz, float* rx, float* ry);

        /*l
         *b  Description:
         **
         **    Returns in the passed variables the rotation amount of the link's
         **    joint.
         **
         **    The values may or may not stay constant frame to frame; see
         **    get_rotation_is_static().
         **
         **    Returned values are a quaternion and should be applied after
         **    the translation.
         **
         *b  Arguments:
         **
         *a    qx, qy, qz, qw - pointers to floats into which result
         *a                 should be placed
         **
         *b  Returns:
         **
         **    0 on success, -1 on failure
         */
        int get_rotation_quat(float* qx, float* qy, float* qz, float* qw);

        /*l
         *b  Description:
         **
         **    Returns whether the rotation returned by get_rotation() is static
         **    (unchanging) or dynamic (can change frame to frame).
         **
         **    If the rotation is dynamic the rotation values will come from one
         **    or more DI-Guy motion variables; the names of the variables are
         **    accessible using the functions get_var_name_rz(), etc.
         **
         **    If the rotation is static it will remain so; the value returned by
         **    this function should not change frame to frame.
         **
         *b  Returns:
         **
         **    1 if rotation is static, 0 if not, -1 on failure
         */
        int get_rotation_is_static();

        /*l
         *b  Description:
         **
         **    Returns the name of the DI-Guy motion data variable that controls
         **    rotation about the Z axis.
         **
         **    The returned pointer will be NULL if there is no associated
         **    variable.
         */
        const char* get_var_name_rz();

        /*l
         *b  Description:
         **
         **    Returns the name of the DI-Guy motion data variable that controls
         **    rotation about the X axis.
         **
         **    The returned pointer will be NULL if there is no associated
         **    variable.
         */
        const char* get_var_name_rx();

        /*l
         *b  Description:
         **
         **    Returns the name of the DI-Guy motion data variable that controls
         **    rotation about the Y axis.
         **
         **    The returned pointer will be NULL if there is no associated
         **    variable.
         */
        const char* get_var_name_ry();


        /*l
         *b  Description:
         **
         **    Returns a pointer to this link's parent link.  Parent links are
         **    always links within the same character.  If a link is attached to
         **    a link in another character (i.e., it is "parented to" another
         **    link), that link pointer can be obtained by calling
         **    get_attached_to_link().
         **
         **    The returned pointer will be NULL if the link is the position link
         **    and has no parent.
         **
         *b  Returns:
         **
         **    object of type diguyGraphicsLink
         */
        diguyGraphicsLink* get_parent_link();

        /*l
         *b  Description:
         **
         **    Returns a pointer to this character's base position link. 
         */
        diguyGraphicsLink* get_position_link();

        diguyGraphicsLink* get_position_link() const;

        /*l
         *b  Description:
         **
         **    Returns a pointer to this link's attached to link.  The attached
         **    to link is different than the parent link in that a parent link is
         **    always a link in the same character, while an attached to link is
         **    always a link in a different character.
         **
         **    Only position links can be attached to links of another character.
         **
         **    The returned pointer will be NULL if the link is not attached to
         **    the link of another character.
         */
        diguyGraphicsLink* get_attached_to_link();

        /*l
         *b  Description:
         **
         **    Returns 1 if this link is the position link, or 0 if not.  The
         **    position link is the root link of the DI-Guy character's link and
         **    shape hierarchy, and has no parent link.
         **
         *b  Returns:
         **
         **    1 if this link is the position link, 0 if not, -1 on error
         */
        int get_is_position_link();

        /*l
         *b  Description:
         **
         **    Returns how many child links this link has.  Child links can be
         **    accessed using the get_child_link_at_index() function.
         **
         *b  Returns:
         **
         **    number of child links
         */
        int get_num_child_links();

        /*l
         *b  Description:
         **
         **    Returns a pointer to this link's child link at the specified
         **    index.
         **
         **    The returned pointer will be NULL if there is no link at that
         **    index.
         **
         *b  Arguments:
         **
         *a    index - index of the child link; indices start at 0
         */
        diguyGraphicsLink* get_child_link_at_index(int index);

/*****************************************************************************/
#ifdef CPLUSPLUS_ONLY

        /*l
         *b  Description:
         **
         **    This function fills out the passed float array with the
         **    world-coordinate system transformation matrix of this link.
         **    ie -> character->get_position_transformation_matrix() * link->get_cached_matrix();
         **
         *b  Arguments:
         **
         *a    matrix_array - two-dimensional array of floats into
         *a                   which the matrix should be copied
         *a    transpose    - defaults to zero, sets if the matrix should be
         *a                   treated as row-major or column-major
         **
         *b  Returns:
         **
         **    0 on success, -1 on failure
         */
        int get_transformation_matrix(float matrix_array[4][4], int transpose = 0);

        /*l
         *b  Description:
         **
         **   Pointer version of get_transformation_matrix(), see for docs.
         **   Some end users might prefer this version to avoid copying data from
         **   an explicit float[4][4].
         **/
        int get_transformation_matrix_4x4_ptr(float* matrix, int transpose = 0);

        /*l
         *b  Description:
         **
         **    This function fills out the passed float array with the
         **    character-local-coordinate system transformation matrix of this
         **    link. Also known as the cached matrix.
         **
         *b  Arguments:
         **
         *a    matrix_array - two-dimensional array of floats into
         *a                   which the matrix should be copied
         *a    transpose    - defaults to 0, sets if the matrix should be treated
         *a                   as row-major or column-major
         **
         *b  Returns:
         **
         **    0 on success, -1 on failure
         */
        int get_local_transformation_matrix(float matrix_array[4][4], int transpose = 0);

        /*l
         *b  Description:
         **
         **   Pointer version of get_local_transformation_matrix(), see for docs.
         *    Some end users might prefer this version to avoid copying data from
         *    an explicit float[4][4]. 
         **/
        int get_local_transformation_matrix_4x4_ptr(float* matrix, int transpose = 0);

        int get_local_translation(float * x, float *y, float *z);

        /*l
         *b  Description:
         **
         **    This function fills out the passed float array with the
         **    link-local-coordinate system transformation matrix of this
         **    link. This is the same value as the matrix built from
         **    get_rotation() and get_translation()
         **
         *b  Arguments:
         **
         *a    matrix_array - two-dimensional array of floats into
         *a                   which the matrix should be copied
         *a    transpose    - defaults to 0, sets if the matrix should be treated
         *a                   as row-major or column-major
         **
         *b  Returns:
         **
         **    0 on success, -1 on failure
         */
        int get_link_transformation_matrix(float matrix_array[4][4], int transpose = 0);

        /*l
         *b  Description:
         **
         **   Pointer version of get_link_transformation_matrix(), see for docs.
         **   Some end users might prefer this version to avoid copying data from
         **   an explicit float[4][4].
         **/
        int get_link_transformation_matrix_4x4_ptr(float* matrix, int transpose = 0);

#endif



#ifdef CPLUSPLUS_ONLY

        /*l
         *b  Description:
         **
         **    Returns a pointer to the current motion data array.  Along with
         **    data indices returned below, motion data can be directly read from
         **    this state vector instead of making multiple calls for getting
         **    transform data.
         **
         **    The rotations in this array will be in Euler angles.  If
         **    quaternions are being used, get_quat_data_ptr() should be called
         **    instead.
         **
         **    This function may return NULL, in which case the functions
         **    get_translation(), get_rotation(), and get_scale() must be used.
         **
         **    The pointer returned by this function may change from frame to
         **    frame, and therefore should not be saved.
         **
         **    This function should not be used for the position link (when
         **    get_is_position_link() returns 1).
         **
         **    This function should not be called in a derived class's
         **    constructor; the pointer will not yet be valid.
         **
         *b  Returns:
         **
         **    pointer to floats; may return NULL if array isn't available
         **
         *b  Callable From:
         **
         *-    - C++
         */
        const float* get_data_ptr();

        /*l
         *b  Description:
         **
         **    This function is similar to get_data_ptr(), except rotations in
         **    the returned array will be in quaternions instead of Euler angles.
         **
         *b  Returns:
         **
         **    pointer to floats; may return NULL if array isn't available
         **
         *b  Callable From:
         **
         *-    - C++
         */
        const float* get_quat_data_ptr();

#endif

        /*l
         *b  Description:
         **
         **    Returns the index of this link's translation data in the float
         **    array returned by get_data_ptr() or get_quat_data_ptr().  The
         **    translation values are in (tx, ty, tz) order in the array.
         **
         **    This function may return -1, in which case this link has no
         **    translation data.
         **
         **    The index returned by this function will not change from frame to
         **    frame, and can therefore be saved once it has been obtained.
         **
         **    This function should not be used for the position link (when
         **    get_is_position_link() returns 1).  Use get_translation() instead.
         **
         **    This function should not be called in a derived class's
         **    constructor; the index will not yet be valid.
         **
         *b  Returns:
         **
         **    index into float array; -1 if no translation data for link
         */
        int get_translation_data_index();

        /*l
         *b  Description:
         **
         **    Returns the index of this link's rotation data in the float array
         **    returned by get_data_ptr().  If quaternion data is being used,
         **    call get_quat_data_ptr() instead.
         **
         **    The rotation values in the data array will be Euler angles in (rz,
         **    rx, ry) order.
         **
         **    This function may return -1, in which case this link has no
         **    rotation data.
         **
         **    This function should not be used for the position link (when
         **    get_is_position_link() returns 1).  Use get_rotation() instead.
         **
         **    This function should not be called in a derived class's
         **    constructor; the index will not yet be valid.
         **
         *b  Returns:
         **
         **    index into float array; -1 if no rotation data for link
         */
        int get_rotation_data_index();

        /*l
         *b  Description:
         **
         **    Returns the index of this link's rotation data in the float array
         **    returned by get_quat_data_ptr().  If Euler angle data is being
         **    used, call get_data_ptr() instead.
         **
         **    The rotation values in the data array will be a quaternion in (qx,
         **    qy, qz, qw) order.
         **
         **    This function may return -1, in which case this link has no
         **    rotation data.
         **
         **    The index returned by this function will not change from frame to
         **    frame, and can therefore be saved once it has been obtained.
         **
         **    This function should not be used for the position link (when
         **    get_is_position_link() returns 1).  Use get_rotation() instead.
         **
         **    This function should not be called in a derived class's
         **    constructor; the index will not yet be valid.
         **
         *b  Returns:
         **
         **    index into float array; -1 if no rotation data for link
         */
        int get_quat_data_index();


        /*l
         *b  Description:
         **
         **    Returns in the passed pointers the unique color of this link. All
         **    links in a DI-Guy appearance are assigned a unique RGB color that
         **    can be used in pick/selection operations.
         **
         **    Also see diguyScenario::map_color_to_impact().
         **
         **    See programming_examples/diguy_graphics_api/ogl_examples/intersection_test
         **    for an example of its usage.
         **
         *b  Returns:
         **
         **    0 on success, -1 on failure
         **    
         ** @TODO Test with lua probably non-functional
         */
        int get_unique_color(unsigned char* r,
                unsigned char* g,
                unsigned char* b);


/*****************************************************************************/
#ifdef CPLUSPLUS_ONLY

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when it is time for
         **    renderer-specific link objects to be created.  All information
         **    necessary to build the link should be available via the Accessor
         **    Functions above when this function is called.
         **
         **    Builds happen in depth-first traversal order, so the parent's
         **    build() function will always be called before this link's build()
         **    function.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers usually do not override this function.
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers usually do override this function, to create
         **    scene graph nodes that allow for the various transformations to
         **    happen.
         **
         **    The following nodes are commonly created:
         **
         *-    - a static transform node to hold the offsets
         *-    - a dynamic transform node (or DOF) to allow motion data
         *-      to be applied
         *-    - either an LOD or switch node to allow graphics LODs to be
         *-      applied
         **
         **    LOD nodes, that automatically handle LOD switching, should be
         **    created if automatic LOD switching is desired.
         **
         **    A switch node should be created if manual setting of the graphics
         **    LOD is desired.
         **
         **    If this link is a position link (it has no parent link), the scene
         **    graph nodes should not yet be attached to the scene graph; that
         **    should be done during the call to attach().
         **
         **    Otherwise the scene graph nodes should start out attached to their
         **    attach points (a scene graph node of the parent link).
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during
         *-      the Build Stage)
         */
        virtual void build();

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when all links and shapes
         **    of a DI-Guy character have been built, providing an opportunity
         **    for final touch-ups to be made to the built hierarchy.
         **
         **    This function will be called only for the top-level position link.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers usually do not override this function.
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers sometimes override this function.  They
         **    might to so to do renderer-specific optimizations to the created
         **    hierarchy.
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during
         *-      the Build Stage)
         */
        virtual void post_build();

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when it is time for the
         **    renderer-specific link objects created during the build() call to
         **    be destroyed.
         **
         **    Unbuilds happen in reverse depth-first traversal order, so this
         **    link's unbuild() function will always be called before the
         **    parent's unbuild() function.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers usually do not override this function.
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers usually do override this function, to
         **    destroy the scene graph nodes created by build().
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during
         *-      the Unbuild Stage)
         */
        virtual void unbuild();

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when it is time for
         **    renderer-specific link objects created during the build() call to
         **    be attached to their attach points.
         **
         **    This function will only be called for the position link.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers usually do not override this function.
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers usually do override this function, to attach
         **    the scene graph nodes created during build() to somewhere on the
         **    scene graph.
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during
         *-      the Build Stage, and sometimes during the Update Stage)
         */
        virtual void attach_to_scene();

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when it is time for
         **    renderer-specific link objects created during the build() call to
         **    be detached from their attach points.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers usually do not override this function.
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers usually do override this function, to detach
         **    the scene graph nodes created during build() from the scene graph.
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during
         *-      the Build Stage, and sometimes during the Update Stage)
         */
        virtual void detach_from_scene();
        
        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when it is time for
         **    renderer-specific link objects created during the build() call to
         **    be updated with new transformation data.
         **
         **    Updates happen in depth-first traversal order, so the parent's
         **    update() function will always be called before this link's
         **    update() function.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers usually do not override this function.
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers usually do override this function, to update
         **    the scene graph nodes created during build() with new values.
         **
         **    These values should be obtained by calling get_translation(),
         **    get_rotation(), and get_scale().
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during Update Stage)
         */
        virtual void update();


        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when it is time for the
         **    transformations of this link to be applied.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers usually do override this function, to
         **    apply transformations to the transformation stack.
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers usually do not override this function;
         **    transformation states are handled automatically by scene graphs.
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during Draw Stage)
         **
         *e
         *e //linear draw behavior
         *e {
         *e     // push the base transform of the character in the world
         *e     // the get_transformation_matrix() of the position link
         *e     m_position_link->begin_character_draw();
         *e     int i;
         *e     for each link in link array
         *e     {
         *e             // note the ability to skip links with nothing attached to them
         *e             if (link->get_num_shapes() > 0 || link->get_is_position_link())
         *e             {
         *e                     // each link should multiply by the get_local_transformation_matrix
         *e                     // which contains the precalculated concatenated matrix
         *e                     link->draw();
         *e             }
         *e     }
         *e     m_position_link->end_character_draw();
         */

        virtual void draw();

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when it a shader should be
         **    bound to this link.  This is important in some scene graph
         **    environments, when the scene graph is responsible for binding the
         **    shader.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers usually do not override this function.
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers can override this function but some don't
         **    need to.
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during Build Stage)
         */
        virtual void set_shader_instance(diguyGraphicsShaderInstance* shader_instance);

        /*b  Description:
         **
         **    This function will be called by DI-Guy in the update loop when the character 
         **    changes instancing state. This allows additional work to be done to manage
         **    instancing. Note this hasn't been needed, for any of our sample implementations.
         */
        virtual void instancing_state_changed(int instanced);

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy while building instance groups (which occurs 
         **    during diguyScenario::draw() or when manually invoked. It gives the user a chance to set
         **    the contents of the tbo on a per shape basis. tbo_data should be a 4x3 matrix. 
         **    Will only be called if diguyScenario::set_instancing_position_callback_enabled() is set to true.
         */
        virtual void fill_out_tbo_position_matrix(diguyGraphicsShape * current_shape, int lod, float * tbo_data) const;

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy while building instance groups (which occurs
         **    during diguyScenario::draw() or when manually invoked. Will allow the end user to add additional 
         **    data to the tbo. This is required to be in blocks of 4 floats. Will only be called if
         **    diguyScenario::set_num_extra_per_instance_data_floats(int number); is set to a reasonable number.
         */
        virtual void fill_out_tbo_additional_data(diguyGraphicsShape * current_shape, float * tbo_data);

/****************************************************************************/
        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when the drawing of a new
         **    character is beginning.  This happens when the position link is
         **    drawn.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers can override this function.  Typically
         **    some type of transformation matrix stack push operation is
         **    performed.  This is also an appropriate place to do any
         **    per-character modifications, such as:
         **
         *-    - applying scale
         *-    - applying the base translation of the character
         *-    - picking a current LOD
         *-    - etc.
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers usually do not override this function;
         **    transformation states are handled automatically by scene graphs.
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during
         *-      Draw Stage)
         */
        virtual void begin_character_draw();

        /*l
         *b  Description:
         **
         **    This function will be called by DI-Guy when the drawing traversal
         **    of the character's link hierarchy has completed.
         **
         *i  Immediate Mode:
         **
         **    Immediate mode renderers can override this function.  Typically
         **    any matrix stack push operation done in begin_character_draw()
         **    is undone here by an appropriate pop operation.
         **
         *i  Scene Graph:
         **
         **    Scene graph renderers usually do not override this function;
         **    transformation states are handled automatically by scene graphs.
         **
         *b  Callable From:
         **
         *-    - N/A (automatically called by DI-Guy Graphics API during
         *-      Draw Stage)
         */
        virtual void end_character_draw();


#endif



/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/

        int get_inverse_rotation_matrix(float matrix_array[4][4], int transpose = 0,
                int include_translation = 1);

        int get_inverse_rotation_matrix_4x4_ptr(float* matrix_array, int transpose = 0, 
                int include_translation = 1);

        int get_approximate_bounding_box(float * bbox_min_x, float * bbox_min_y, float * bbox_min_z,
                float * bbox_max_x, float * bbox_max_y, float * bbox_max_z);

/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/

        /*l
         *b  Description:
         **
         **    Deprecated as of 9.1.4; use diguyGraphicsLink::get_is_position_link()
         **    instead.
         */
        int get_is_base_link();

        /*l
         *b  Description:
         **
         **    Deprecated as of 12.0.0 due to architecture change
         */
        //int get_shader_matrix_index();

        //Deprecated as of 13.2.0 due to architecture change
        /*l
        *b  Deprecated, we don't currently support scaling links
        **
        **    Returns in the passed variables the scale amount of the link's
        **    joint.
        **
        **    The values may or may not stay constant frame to frame; see
        **    get_scale_is_static().
        **
        **    Returned values unitless scale factors, and should be applied
        **    after the rotation.
        **
        *b  Arguments:
        **
        *a    sx, sy, sz - pointers to floats into which result
        *a                 should be placed
        **
        *b  Returns:
        **
        **    0 on success, -1 on failure
        */
        int get_scale(float* sz, float* sx, float* sy);

        /*l
        *b  Description:
        **
        **    Returns whether the scale returned by get_scale() is static
        **    (unchanging) or dynamic (can change frame to frame).
        **
        **    If the scale is dynamic the scale values will come from one or
        **    more DI-Guy motion variables; the names of the variables are
        **    accessible using the functions get_var_name_sx(), etc.
        **
        **    If the scale is static it will remain so; the value returned by
        **    this function should not change frame to frame.
        **
        *b  Returns:
        **
        **    1 if scale is static, 0 if not, -1 on failure
        */
        int get_scale_is_static();

        /*l
        *b  Description:
        **
        **    Returns the name of the DI-Guy motion data variable that controls
        **    scale in the Z dimension.
        **
        **    The returned pointer will be NULL if there is no associated
        **    variable.
        */
        const char* get_var_name_sx();

        /*l
        *b  Description:
        **
        **    Returns the name of the DI-Guy motion data variable that controls
        **    scale in the Y dimension.
        **
        **    The returned pointer will be NULL if there is no associated
        **    variable.
        */
        const char* get_var_name_sy();

        /*l
        *b  Description:
        **
        **    Returns the name of the DI-Guy motion data variable that controls
        **    scale in the X dimension.
        **
        **    The returned pointer will be NULL if there is no associated
        **    variable.
        */
        const char* get_var_name_sz();

        /*l
        *b  Description:
        **
        **    Returns the index of this link's scale data in the float array
        **    returned by get_data_ptr() or get_quat_data_ptr().  The scale
        **    values are in (sx, sy, sz) order in the array.
        **
        **    This function may return -1, in which case this link has no scale
        **    data.
        **
        **    The index returned by this function will not change from frame to
        **    frame, and can therefore be saved once it has been obtained.
        **
        **    This function should not be used for the position link (when
        **    get_is_position_link() returns 1).  Use get_scale() instead.
        **
        **    This function should not be called in a derived class's
        **    constructor; the index will not yet be valid.
        **
        *b  Returns:
        **
        **    index into float array; -1 if no scale data for link
        */
        int get_scale_data_index();

/****************************************************************************/
/****************************************************************************/
        void set_selected(bool value);
        bool get_selected();
        
        // These functions were removed since they are now always zero and their use
        // could lead to confusion. Links now only have translations and rotations, 
        // those completely represent their offset from their parents
        //int get_offset_translation(float* tx, float* ty, float* tz);

        //int get_offset_rotation(float* rz, float* rx, float* ry);

#ifdef CPLUSPLUS_ONLY

        bdiLink* get_scripted_object() {return m_scripted_object;}

protected:

        /*l
         **    A protected constructor.  Constructors are called automatically
         **    by DI-Guy.
         */
        diguyGraphicsLink(void* internal_data);

        /*l
         **    A protected destructor.  Destructors are called automatically
         **    by DI-Guy.
         */
        virtual ~diguyGraphicsLink();

private:

        /*l
         **    A pointer to internal data.
         */
        bdiLink* m_scripted_object;

        friend class bdiLink;
        friend class bdiGraphicsFactory;

#endif

};