Panda3D
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00001 // Filename: rescaleNormalAttrib.cxx 00002 // Created by: drose (30Dec04) 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 "rescaleNormalAttrib.h" 00016 #include "graphicsStateGuardianBase.h" 00017 #include "string_utils.h" 00018 #include "dcast.h" 00019 #include "bamReader.h" 00020 #include "bamWriter.h" 00021 #include "datagram.h" 00022 #include "datagramIterator.h" 00023 #include "configVariableEnum.h" 00024 00025 TypeHandle RescaleNormalAttrib::_type_handle; 00026 int RescaleNormalAttrib::_attrib_slot; 00027 00028 // This variable is defined here instead of in config_pgraph.cxx, 00029 // because it depends on rescaleNormalAttrib.h having already been 00030 // included. 00031 static ConfigVariableEnum<RescaleNormalAttrib::Mode> rescale_normals 00032 ("rescale-normals", RescaleNormalAttrib::M_auto, 00033 PRC_DESC("Specifies the kind of RescaleNormalAttrib that should be " 00034 "created for the top of the scene graph. This can automatically " 00035 "ensure that your lighting normals are unit-length, which may be " 00036 "particularly necessary in the presence of scales in the scene " 00037 "graph. Turning it off ('none') may produce a small performance " 00038 "benefit.")); 00039 00040 //////////////////////////////////////////////////////////////////// 00041 // Function: RescaleNormalAttrib::make 00042 // Access: Published, Static 00043 // Description: Constructs a new RescaleNormalAttrib object that 00044 // specifies whether to rescale normals to compensate 00045 // for transform scales or incorrectly defined normals. 00046 //////////////////////////////////////////////////////////////////// 00047 CPT(RenderAttrib) RescaleNormalAttrib:: 00048 make(RescaleNormalAttrib::Mode mode) { 00049 RescaleNormalAttrib *attrib = new RescaleNormalAttrib(mode); 00050 return return_new(attrib); 00051 } 00052 00053 //////////////////////////////////////////////////////////////////// 00054 // Function: RescaleNormalAttrib::make_default 00055 // Access: Published, Static 00056 // Description: Constructs a RescaleNoramlAttrib object that's 00057 // suitable for putting at the top of a scene graph. 00058 // This will contain whatever attrib was suggested by 00059 // the user's rescale-normals Config variable. 00060 //////////////////////////////////////////////////////////////////// 00061 CPT(RenderAttrib) RescaleNormalAttrib:: 00062 make_default() { 00063 RescaleNormalAttrib *attrib = new RescaleNormalAttrib(rescale_normals); 00064 return return_new(attrib); 00065 } 00066 00067 //////////////////////////////////////////////////////////////////// 00068 // Function: RescaleNormalAttrib::output 00069 // Access: Public, Virtual 00070 // Description: 00071 //////////////////////////////////////////////////////////////////// 00072 void RescaleNormalAttrib:: 00073 output(ostream &out) const { 00074 out << get_type() << ":" << get_mode(); 00075 } 00076 00077 //////////////////////////////////////////////////////////////////// 00078 // Function: RescaleNormalAttrib::compare_to_impl 00079 // Access: Protected, Virtual 00080 // Description: Intended to be overridden by derived RescaleNormalAttrib 00081 // types to return a unique number indicating whether 00082 // this RescaleNormalAttrib is equivalent to the other one. 00083 // 00084 // This should return 0 if the two RescaleNormalAttrib objects 00085 // are equivalent, a number less than zero if this one 00086 // should be sorted before the other one, and a number 00087 // greater than zero otherwise. 00088 // 00089 // This will only be called with two RescaleNormalAttrib 00090 // objects whose get_type() functions return the same. 00091 //////////////////////////////////////////////////////////////////// 00092 int RescaleNormalAttrib:: 00093 compare_to_impl(const RenderAttrib *other) const { 00094 const RescaleNormalAttrib *ta; 00095 DCAST_INTO_R(ta, other, 0); 00096 return (int)_mode - (int)ta->_mode; 00097 } 00098 00099 //////////////////////////////////////////////////////////////////// 00100 // Function: RescaleNormalAttrib::register_with_read_factory 00101 // Access: Public, Static 00102 // Description: Tells the BamReader how to create objects of type 00103 // RescaleNormalAttrib. 00104 //////////////////////////////////////////////////////////////////// 00105 void RescaleNormalAttrib:: 00106 register_with_read_factory() { 00107 BamReader::get_factory()->register_factory(get_class_type(), make_from_bam); 00108 } 00109 00110 //////////////////////////////////////////////////////////////////// 00111 // Function: RescaleNormalAttrib::write_datagram 00112 // Access: Public, Virtual 00113 // Description: Writes the contents of this object to the datagram 00114 // for shipping out to a Bam file. 00115 //////////////////////////////////////////////////////////////////// 00116 void RescaleNormalAttrib:: 00117 write_datagram(BamWriter *manager, Datagram &dg) { 00118 RenderAttrib::write_datagram(manager, dg); 00119 00120 dg.add_int8(_mode); 00121 } 00122 00123 //////////////////////////////////////////////////////////////////// 00124 // Function: RescaleNormalAttrib::make_from_bam 00125 // Access: Protected, Static 00126 // Description: This function is called by the BamReader's factory 00127 // when a new object of type RescaleNormalAttrib is encountered 00128 // in the Bam file. It should create the RescaleNormalAttrib 00129 // and extract its information from the file. 00130 //////////////////////////////////////////////////////////////////// 00131 TypedWritable *RescaleNormalAttrib:: 00132 make_from_bam(const FactoryParams ¶ms) { 00133 RescaleNormalAttrib *attrib = new RescaleNormalAttrib(M_none); 00134 DatagramIterator scan; 00135 BamReader *manager; 00136 00137 parse_params(params, scan, manager); 00138 attrib->fillin(scan, manager); 00139 00140 return attrib; 00141 } 00142 00143 //////////////////////////////////////////////////////////////////// 00144 // Function: RescaleNormalAttrib::fillin 00145 // Access: Protected 00146 // Description: This internal function is called by make_from_bam to 00147 // read in all of the relevant data from the BamFile for 00148 // the new RescaleNormalAttrib. 00149 //////////////////////////////////////////////////////////////////// 00150 void RescaleNormalAttrib:: 00151 fillin(DatagramIterator &scan, BamReader *manager) { 00152 RenderAttrib::fillin(scan, manager); 00153 00154 _mode = (Mode)scan.get_int8(); 00155 } 00156 00157 //////////////////////////////////////////////////////////////////// 00158 // Function: RescaleNormalAttrib::Mode output operator 00159 // Description: 00160 //////////////////////////////////////////////////////////////////// 00161 ostream & 00162 operator << (ostream &out, RescaleNormalAttrib::Mode mode) { 00163 switch (mode) { 00164 case RescaleNormalAttrib::M_none: 00165 return out << "none"; 00166 00167 case RescaleNormalAttrib::M_rescale: 00168 return out << "rescale"; 00169 00170 case RescaleNormalAttrib::M_normalize: 00171 return out << "normalize"; 00172 00173 case RescaleNormalAttrib::M_auto: 00174 return out << "auto"; 00175 } 00176 00177 return out << "(**invalid RescaleNormalAttrib::Mode(" << (int)mode << ")**)"; 00178 } 00179 00180 //////////////////////////////////////////////////////////////////// 00181 // Function: RescaleNormalAttrib::Mode input operator 00182 // Description: 00183 //////////////////////////////////////////////////////////////////// 00184 istream & 00185 operator >> (istream &in, RescaleNormalAttrib::Mode &mode) { 00186 string word; 00187 in >> word; 00188 00189 if (cmp_nocase(word, "none") == 0) { 00190 mode = RescaleNormalAttrib::M_none; 00191 00192 } else if (cmp_nocase(word, "rescale") == 0) { 00193 mode = RescaleNormalAttrib::M_rescale; 00194 00195 } else if (cmp_nocase(word, "normalize") == 0) { 00196 mode = RescaleNormalAttrib::M_normalize; 00197 00198 } else if (cmp_nocase(word, "auto") == 0) { 00199 mode = RescaleNormalAttrib::M_auto; 00200 00201 } else { 00202 pgraph_cat.error() 00203 << "Invalid RescaleNormalAttrib::Mode value: " << word << "\n"; 00204 mode = RescaleNormalAttrib::M_none; 00205 } 00206 00207 return in; 00208 }