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fltMesh.cxx
00001 // Filename: fltMesh.cxx
00002 // Created by:  drose (28Feb01)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #include "fltMesh.h"
00016 #include "fltRecordReader.h"
00017 #include "fltRecordWriter.h"
00018 #include "fltHeader.h"
00019 #include "fltMaterial.h"
00020 #include "config_flt.h"
00021 
00022 TypeHandle FltMesh::_type_handle;
00023 
00024 ////////////////////////////////////////////////////////////////////
00025 //     Function: FltMesh::Constructor
00026 //       Access: Public
00027 //  Description:
00028 ////////////////////////////////////////////////////////////////////
00029 FltMesh::
00030 FltMesh(FltHeader *header) : FltGeometry(header) {
00031 }
00032 
00033 ////////////////////////////////////////////////////////////////////
00034 //     Function: FltMesh::extract_record
00035 //       Access: Protected, Virtual
00036 //  Description: Fills in the information in this bead based on the
00037 //               information given in the indicated datagram, whose
00038 //               opcode has already been read.  Returns true on
00039 //               success, false if the datagram is invalid.
00040 ////////////////////////////////////////////////////////////////////
00041 bool FltMesh::
00042 extract_record(FltRecordReader &reader) {
00043   if (!FltBeadID::extract_record(reader)) {
00044     return false;
00045   }
00046 
00047   DatagramIterator &iterator = reader.get_iterator();
00048   iterator.skip_bytes(4); // Undocumented padding.
00049 
00050   if (!FltGeometry::extract_record(reader)) {
00051     return false;
00052   }
00053 
00054   nassertr(reader.get_opcode() == FO_mesh, false);
00055 
00056   check_remaining_size(iterator);
00057   return true;
00058 }
00059 
00060 ////////////////////////////////////////////////////////////////////
00061 //     Function: FltMesh::extract_ancillary
00062 //       Access: Protected, Virtual
00063 //  Description: Checks whether the given bead, which follows this
00064 //               bead sequentially in the file, is an ancillary record
00065 //               of this bead.  If it is, extracts the relevant
00066 //               information and returns true; otherwise, leaves it
00067 //               alone and returns false.
00068 ////////////////////////////////////////////////////////////////////
00069 bool FltMesh::
00070 extract_ancillary(FltRecordReader &reader) {
00071   if (reader.get_opcode() == FO_local_vertex_pool) {
00072     _vpool = new FltLocalVertexPool(_header);
00073     return _vpool->extract_record(reader);
00074   }
00075 
00076   return FltBeadID::extract_ancillary(reader);
00077 }
00078 
00079 ////////////////////////////////////////////////////////////////////
00080 //     Function: FltMesh::build_record
00081 //       Access: Protected, Virtual
00082 //  Description: Fills up the current record on the FltRecordWriter with
00083 //               data for this record, but does not advance the
00084 //               writer.  Returns true on success, false if there is
00085 //               some error.
00086 ////////////////////////////////////////////////////////////////////
00087 bool FltMesh::
00088 build_record(FltRecordWriter &writer) const {
00089   if (!FltBeadID::build_record(writer)) {
00090     return false;
00091   }
00092 
00093   Datagram &datagram = writer.update_datagram();
00094   datagram.pad_bytes(4); // Undocumented padding.
00095 
00096   if (!FltGeometry::build_record(writer)) {
00097     return false;
00098   }
00099 
00100   writer.set_opcode(FO_mesh);
00101 
00102   return true;
00103 }
00104 
00105 ////////////////////////////////////////////////////////////////////
00106 //     Function: FltMesh::write_ancillary
00107 //       Access: Protected, Virtual
00108 //  Description: Writes whatever ancillary records are required for
00109 //               this record.  Returns FE_ok on success, or something
00110 //               else if there is some error.
00111 ////////////////////////////////////////////////////////////////////
00112 FltError FltMesh::
00113 write_ancillary(FltRecordWriter &writer) const {
00114   if (_vpool != (FltLocalVertexPool *)NULL) {
00115     if (!_vpool->build_record(writer)) {
00116       assert(!flt_error_abort);
00117       return FE_bad_data;
00118     }
00119     FltError result = writer.advance();
00120     if (result != FE_ok) {
00121       return result;
00122     }
00123   }
00124 
00125   return FltBeadID::write_ancillary(writer);
00126 }
00127 
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