/**
 * PANDA 3D SOFTWARE
 * Copyright (c) Carnegie Mellon University.  All rights reserved.
 *
 * All use of this software is subject to the terms of the revised BSD
 * license.  You should have received a copy of this license along
 * with this source code in a file named "LICENSE."
 *
 * @file transformBlendTable.I
 * @author drose
 * @date 2005-03-24
 */

/**
 * Returns the total number of different blend combinations in the table.
 */
INLINE size_t TransformBlendTable::
get_num_blends() const {
  return _blends.size();
}

/**
 * Returns the nth blend in the table.
 */
INLINE const TransformBlend &TransformBlendTable::
get_blend(size_t n) const {
  nassertr(n < _blends.size(), _blends[0]);
  return _blends[n];
}

/**
 * Returns a counter which is guaranteed to increment at least when any
 * TransformBlends within the table have changed.
 */
INLINE UpdateSeq TransformBlendTable::
get_modified(Thread *current_thread) const {
  CDLockedReader cdata(_cycler);
  if (cdata->_global_modified != VertexTransform::get_global_modified(current_thread)) {
    CDWriter cdataw(((TransformBlendTable *)this)->_cycler, cdata, false);
    ((TransformBlendTable *)this)->recompute_modified(cdataw, current_thread);
    return cdataw->_modified;
  } else {
    return cdata->_modified;
  }
}

/**
 * Returns the number of unique VertexTransform objects represented in the
 * table.  This will correspond to the size of the TransformTable object that
 * would represent the same table.  This is also the same limit reflected by
 * GraphicsStateGuardian::get_max_vertex_transform_indices().
 */
INLINE int TransformBlendTable::
get_num_transforms() const {
  consider_rebuild_index();

  if (_num_transforms < 0) {
    // Even if our index is otherwise accurate, we might have recently added a
    // blend or two, which would necessitate recomputing this value--which
    // means we need to rebuild the index.
    ((TransformBlendTable *)this)->rebuild_index();
  }

  return _num_transforms;
}

/**
 * Returns the maximum number of unique VertexTransform objects that are
 * applied to any one vertex simultaneously.  This is the same limit reflected
 * by GraphicsStateGuardian::get_max_vertex_transforms().
 */
INLINE int TransformBlendTable::
get_max_simultaneous_transforms() const {
  consider_rebuild_index();
  return _max_simultaneous_transforms;
}

/**
 * Specifies the subset of rows (vertices) in the associated GeomVertexData
 * that this TransformBlendTable actually affects.
 */
INLINE void TransformBlendTable::
set_rows(const SparseArray &rows) {
  _rows = rows;
}

/**
 * Returns the subset of rows (vertices) in the associated GeomVertexData that
 * this TransformBlendTable actually affects.
 */
INLINE const SparseArray &TransformBlendTable::
get_rows() const {
  return _rows;
}

/**
 * Returns a modifiable reference to the SparseArray that specifies the subset
 * of rows (vertices) in the associated GeomVertexData that this
 * TransformBlendTable actually affects.
 */
INLINE SparseArray &TransformBlendTable::
modify_rows() {
  return _rows;
}

/**
 * Calls rebuild_index() if the index needs to be rebuilt.
 */
INLINE void TransformBlendTable::
consider_rebuild_index() const {
  if (_blend_index.empty()) {
    ((TransformBlendTable *)this)->rebuild_index();
  }
}

/**
 *
 */
INLINE TransformBlendTable::CData::
CData() {
}

/**
 *
 */
INLINE TransformBlendTable::CData::
CData(const TransformBlendTable::CData &copy) :
  _modified(copy._modified),
  _global_modified(copy._global_modified)
{
}