Panda3D

depthWriteAttrib.cxx

00001 // Filename: depthWriteAttrib.cxx
00002 // Created by:  drose (04Mar02)
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 "depthWriteAttrib.h"
00016 #include "graphicsStateGuardianBase.h"
00017 #include "dcast.h"
00018 #include "bamReader.h"
00019 #include "bamWriter.h"
00020 #include "datagram.h"
00021 #include "datagramIterator.h"
00022 
00023 TypeHandle DepthWriteAttrib::_type_handle;
00024 int DepthWriteAttrib::_attrib_slot;
00025 
00026 ////////////////////////////////////////////////////////////////////
00027 //     Function: DepthWriteAttrib::make
00028 //       Access: Published, Static
00029 //  Description: Constructs a new DepthWriteAttrib object.
00030 ////////////////////////////////////////////////////////////////////
00031 CPT(RenderAttrib) DepthWriteAttrib::
00032 make(DepthWriteAttrib::Mode mode) {
00033   DepthWriteAttrib *attrib = new DepthWriteAttrib(mode);
00034   return return_new(attrib);
00035 }
00036 
00037 ////////////////////////////////////////////////////////////////////
00038 //     Function: DepthWriteAttrib::make_default
00039 //       Access: Published, Static
00040 //  Description: Returns a RenderAttrib that corresponds to whatever
00041 //               the standard default properties for render attributes
00042 //               of this type ought to be.
00043 ////////////////////////////////////////////////////////////////////
00044 CPT(RenderAttrib) DepthWriteAttrib::
00045 make_default() {
00046   return return_new(new DepthWriteAttrib);
00047 }
00048 
00049 ////////////////////////////////////////////////////////////////////
00050 //     Function: DepthWriteAttrib::output
00051 //       Access: Public, Virtual
00052 //  Description: 
00053 ////////////////////////////////////////////////////////////////////
00054 void DepthWriteAttrib::
00055 output(ostream &out) const {
00056   out << get_type() << ":";
00057   switch (get_mode()) {
00058   case M_off:
00059     out << "off";
00060     break;
00061   case M_on:
00062     out << "on";
00063     break;
00064   }
00065 }
00066 
00067 ////////////////////////////////////////////////////////////////////
00068 //     Function: DepthWriteAttrib::compare_to_impl
00069 //       Access: Protected, Virtual
00070 //  Description: Intended to be overridden by derived DepthWriteAttrib
00071 //               types to return a unique number indicating whether
00072 //               this DepthWriteAttrib is equivalent to the other one.
00073 //
00074 //               This should return 0 if the two DepthWriteAttrib objects
00075 //               are equivalent, a number less than zero if this one
00076 //               should be sorted before the other one, and a number
00077 //               greater than zero otherwise.
00078 //
00079 //               This will only be called with two DepthWriteAttrib
00080 //               objects whose get_type() functions return the same.
00081 ////////////////////////////////////////////////////////////////////
00082 int DepthWriteAttrib::
00083 compare_to_impl(const RenderAttrib *other) const {
00084   const DepthWriteAttrib *ta;
00085   DCAST_INTO_R(ta, other, 0);
00086   return (int)_mode - (int)ta->_mode;
00087 }
00088 
00089 ////////////////////////////////////////////////////////////////////
00090 //     Function: DepthWriteAttrib::get_hash_impl
00091 //       Access: Protected, Virtual
00092 //  Description: Intended to be overridden by derived RenderAttrib
00093 //               types to return a unique hash for these particular
00094 //               properties.  RenderAttribs that compare the same with
00095 //               compare_to_impl(), above, should return the same
00096 //               hash; RenderAttribs that compare differently should
00097 //               return a different hash.
00098 ////////////////////////////////////////////////////////////////////
00099 size_t DepthWriteAttrib::
00100 get_hash_impl() const {
00101   size_t hash = 0;
00102   hash = int_hash::add_hash(hash, (int)_mode);
00103   return hash;
00104 }
00105 
00106 ////////////////////////////////////////////////////////////////////
00107 //     Function: DepthWriteAttrib::register_with_read_factory
00108 //       Access: Public, Static
00109 //  Description: Tells the BamReader how to create objects of type
00110 //               DepthWriteAttrib.
00111 ////////////////////////////////////////////////////////////////////
00112 void DepthWriteAttrib::
00113 register_with_read_factory() {
00114   BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
00115 }
00116 
00117 ////////////////////////////////////////////////////////////////////
00118 //     Function: DepthWriteAttrib::write_datagram
00119 //       Access: Public, Virtual
00120 //  Description: Writes the contents of this object to the datagram
00121 //               for shipping out to a Bam file.
00122 ////////////////////////////////////////////////////////////////////
00123 void DepthWriteAttrib::
00124 write_datagram(BamWriter *manager, Datagram &dg) {
00125   RenderAttrib::write_datagram(manager, dg);
00126 
00127   dg.add_int8(_mode);
00128 }
00129 
00130 ////////////////////////////////////////////////////////////////////
00131 //     Function: DepthWriteAttrib::make_from_bam
00132 //       Access: Protected, Static
00133 //  Description: This function is called by the BamReader's factory
00134 //               when a new object of type DepthWriteAttrib is encountered
00135 //               in the Bam file.  It should create the DepthWriteAttrib
00136 //               and extract its information from the file.
00137 ////////////////////////////////////////////////////////////////////
00138 TypedWritable *DepthWriteAttrib::
00139 make_from_bam(const FactoryParams &params) {
00140   DepthWriteAttrib *attrib = new DepthWriteAttrib;
00141   DatagramIterator scan;
00142   BamReader *manager;
00143 
00144   parse_params(params, scan, manager);
00145   attrib->fillin(scan, manager);
00146 
00147   return attrib;
00148 }
00149 
00150 ////////////////////////////////////////////////////////////////////
00151 //     Function: DepthWriteAttrib::fillin
00152 //       Access: Protected
00153 //  Description: This internal function is called by make_from_bam to
00154 //               read in all of the relevant data from the BamFile for
00155 //               the new DepthWriteAttrib.
00156 ////////////////////////////////////////////////////////////////////
00157 void DepthWriteAttrib::
00158 fillin(DatagramIterator &scan, BamReader *manager) {
00159   RenderAttrib::fillin(scan, manager);
00160 
00161   _mode = (Mode)scan.get_int8();
00162 }
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