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depthTestAttrib.cxx
00001 // Filename: depthTestAttrib.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 "depthTestAttrib.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 DepthTestAttrib::_type_handle;
00024 int DepthTestAttrib::_attrib_slot;
00025 
00026 ////////////////////////////////////////////////////////////////////
00027 //     Function: DepthTestAttrib::make
00028 //       Access: Published, Static
00029 //  Description: Constructs a new DepthTestAttrib object.
00030 ////////////////////////////////////////////////////////////////////
00031 CPT(RenderAttrib) DepthTestAttrib::
00032 make(DepthTestAttrib::PandaCompareFunc mode) {
00033   DepthTestAttrib *attrib = new DepthTestAttrib(mode);
00034   return return_new(attrib);
00035 }
00036 
00037 ////////////////////////////////////////////////////////////////////
00038 //     Function: DepthTestAttrib::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) DepthTestAttrib::
00045 make_default() {
00046   return return_new(new DepthTestAttrib);
00047 }
00048 
00049 ////////////////////////////////////////////////////////////////////
00050 //     Function: DepthTestAttrib::output
00051 //       Access: Public, Virtual
00052 //  Description: 
00053 ////////////////////////////////////////////////////////////////////
00054 void DepthTestAttrib::
00055 output(ostream &out) const {
00056   out << get_type() << ":";
00057   output_comparefunc(out,_mode);
00058 }
00059 
00060 ////////////////////////////////////////////////////////////////////
00061 //     Function: DepthTestAttrib::compare_to_impl
00062 //       Access: Protected, Virtual
00063 //  Description: Intended to be overridden by derived DepthTestAttrib
00064 //               types to return a unique number indicating whether
00065 //               this DepthTestAttrib is equivalent to the other one.
00066 //
00067 //               This should return 0 if the two DepthTestAttrib objects
00068 //               are equivalent, a number less than zero if this one
00069 //               should be sorted before the other one, and a number
00070 //               greater than zero otherwise.
00071 //
00072 //               This will only be called with two DepthTestAttrib
00073 //               objects whose get_type() functions return the same.
00074 ////////////////////////////////////////////////////////////////////
00075 int DepthTestAttrib::
00076 compare_to_impl(const RenderAttrib *other) const {
00077   const DepthTestAttrib *ta;
00078   DCAST_INTO_R(ta, other, 0);
00079   return (int)_mode - (int)ta->_mode;
00080 }
00081 
00082 ////////////////////////////////////////////////////////////////////
00083 //     Function: DepthTestAttrib::get_hash_impl
00084 //       Access: Protected, Virtual
00085 //  Description: Intended to be overridden by derived RenderAttrib
00086 //               types to return a unique hash for these particular
00087 //               properties.  RenderAttribs that compare the same with
00088 //               compare_to_impl(), above, should return the same
00089 //               hash; RenderAttribs that compare differently should
00090 //               return a different hash.
00091 ////////////////////////////////////////////////////////////////////
00092 size_t DepthTestAttrib::
00093 get_hash_impl() const {
00094   size_t hash = 0;
00095   hash = int_hash::add_hash(hash, (int)_mode);
00096   return hash;
00097 }
00098 
00099 ////////////////////////////////////////////////////////////////////
00100 //     Function: DepthTestAttrib::register_with_read_factory
00101 //       Access: Public, Static
00102 //  Description: Tells the BamReader how to create objects of type
00103 //               DepthTestAttrib.
00104 ////////////////////////////////////////////////////////////////////
00105 void DepthTestAttrib::
00106 register_with_read_factory() {
00107   BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
00108 }
00109 
00110 ////////////////////////////////////////////////////////////////////
00111 //     Function: DepthTestAttrib::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 DepthTestAttrib::
00117 write_datagram(BamWriter *manager, Datagram &dg) {
00118   RenderAttrib::write_datagram(manager, dg);
00119 
00120   dg.add_int8(_mode);
00121 }
00122 
00123 ////////////////////////////////////////////////////////////////////
00124 //     Function: DepthTestAttrib::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 DepthTestAttrib is encountered
00128 //               in the Bam file.  It should create the DepthTestAttrib
00129 //               and extract its information from the file.
00130 ////////////////////////////////////////////////////////////////////
00131 TypedWritable *DepthTestAttrib::
00132 make_from_bam(const FactoryParams &params) {
00133   DepthTestAttrib *attrib = new DepthTestAttrib;
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: DepthTestAttrib::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 DepthTestAttrib.
00149 ////////////////////////////////////////////////////////////////////
00150 void DepthTestAttrib::
00151 fillin(DatagramIterator &scan, BamReader *manager) {
00152   RenderAttrib::fillin(scan, manager);
00153 
00154   _mode = (PandaCompareFunc)scan.get_int8();
00155 }
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