eggTable.cxx

// Filename: eggTable.cxx
// Created by:  drose (19Feb99)
//
////////////////////////////////////////////////////////////////////
//
// 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."
//
////////////////////////////////////////////////////////////////////

#include "eggTable.h"

#include "string_utils.h"
#include "indent.h"

TypeHandle EggTable::_type_handle;

////////////////////////////////////////////////////////////////////
//     Function: EggTable::has_transform
//       Access: Public
//  Description: Returns true if the table contains a transform
//               description, false otherwise.
////////////////////////////////////////////////////////////////////
bool EggTable::
has_transform() const {
  const_iterator ci;

  for (ci = begin(); ci != end(); ++ci) {
    EggNode *child = (*ci);
    if (child->is_anim_matrix()) {
      return true;
    }
  }
  
  return false;
}

////////////////////////////////////////////////////////////////////
//     Function: EggTable::write
//       Access: Public, Virtual
//  Description: Writes the table and all of its children to the
//               indicated output stream in Egg format.
////////////////////////////////////////////////////////////////////
void EggTable::
write(ostream &out, int indent_level) const {
  test_under_integrity();

  switch (get_table_type()) {
  case TT_table:
    write_header(out, indent_level, "<Table>");
    break;

  case TT_bundle:
    write_header(out, indent_level, "<Bundle>");
    break;

  default:
    // invalid table type
    nassertv(false);
  }

  EggGroupNode::write(out, indent_level + 2);
  indent(out, indent_level) << "}\n";
}


////////////////////////////////////////////////////////////////////
//     Function: EggTable::string_table_type
//       Access: Public, Static
//  Description: Returns the TableType value associated with the given
//               string representation, or TT_invalid if the string
//               does not match any known TableType value.
////////////////////////////////////////////////////////////////////
EggTable::TableType EggTable::
string_table_type(const string &string) {
  if (cmp_nocase_uh(string, "table") == 0) {
    return TT_table;
  } else if (cmp_nocase_uh(string, "bundle") == 0) {
    return TT_bundle;
  } else {
    return TT_invalid;
  }
}

////////////////////////////////////////////////////////////////////
//     Function: EggTable::r_transform
//       Access: Protected, Virtual
//  Description: This is called from within the egg code by
//               transform().  It applies a transformation matrix
//               to the current node in some sensible way, then
//               continues down the tree.
//
//               The first matrix is the transformation to apply; the
//               second is its inverse.  The third parameter is the
//               coordinate system we are changing to, or CS_default
//               if we are not changing coordinate systems.
////////////////////////////////////////////////////////////////////
void EggTable::
r_transform(const LMatrix4d &mat, const LMatrix4d &inv,
            CoordinateSystem to_cs) {
  // We need to duplicate the logic in EggGroup: if we have a matrix
  // transform witin this table, apply the transformation to it, but
  // then apply only the scale/rotational part of the transformation
  // to any children.

  // On the other hand, if we have no matrix transform within this
  // table, pass the transformation through.

  // This logic is complicated by the fact that matrix transforms with
  // a <Table> group are not stored within the table itself, but
  // rather within a child named "xform".  Fortunately,
  // has_transform() abstracts out this detail for us.

  if (has_transform()) {
    // At least one child of this table represents an animation matrix
    // transform: that child gets the real matrix, while all other
    // children get the truncated matrix.

    LMatrix4d mat1 = mat;
    LMatrix4d inv1 = inv;

    // If we have a translation component, we should only apply
    // it to the top matrix.  All subsequent matrices get just the
    // rotational component.
    mat1.set_row(3, LVector3d(0.0, 0.0, 0.0));
    inv1.set_row(3, LVector3d(0.0, 0.0, 0.0));

    iterator ci;
    for (ci = begin(); ci != end(); ++ci) {
      EggNode *child = (*ci);
      if (child->is_anim_matrix()) {
        child->r_transform(mat, inv, to_cs);
      } else {
        child->r_transform(mat1, inv1, to_cs);
      }
    }

  } else {
    // No children of this table represent an animation matrix
    // transform: all children get the real matrix.
    EggGroupNode::r_transform(mat, inv, to_cs);
  }
}


////////////////////////////////////////////////////////////////////
//     Function: TableType output operator
//  Description:
////////////////////////////////////////////////////////////////////
ostream &operator << (ostream &out, EggTable::TableType t) {
  switch (t) {
  case EggTable::TT_invalid:
    return out << "invalid table";
  case EggTable::TT_table:
    return out << "table";
  case EggTable::TT_bundle:
    return out << "bundle";
  }

  nassertr(false, out);
  return out << "(**invalid**)";
}