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colorAttrib.cxx
00001 // Filename: colorAttrib.cxx
00002 // Created by:  drose (22Feb02)
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 "colorAttrib.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 ColorAttrib::_type_handle;
00024 int ColorAttrib::_attrib_slot;
00025 CPT(RenderAttrib) ColorAttrib::_off;
00026 CPT(RenderAttrib) ColorAttrib::_vertex;
00027 
00028 ////////////////////////////////////////////////////////////////////
00029 //     Function: ColorAttrib::make_vertex
00030 //       Access: Published, Static
00031 //  Description: Constructs a new ColorAttrib object that indicates
00032 //               geometry should be rendered according to its own
00033 //               vertex color.
00034 ////////////////////////////////////////////////////////////////////
00035 CPT(RenderAttrib) ColorAttrib::
00036 make_vertex() {
00037   if (_vertex != 0) {
00038     return _vertex;
00039   }
00040   ColorAttrib *attrib = new ColorAttrib(T_vertex, LColor::zero());
00041   _vertex = return_new(attrib);
00042   return _vertex;
00043 }
00044 
00045 ////////////////////////////////////////////////////////////////////
00046 //     Function: ColorAttrib::make_flat
00047 //       Access: Published, Static
00048 //  Description: Constructs a new ColorAttrib object that indicates
00049 //               geometry should be rendered in the indicated color.
00050 ////////////////////////////////////////////////////////////////////
00051 CPT(RenderAttrib) ColorAttrib::
00052 make_flat(const LColor &color) {
00053   ColorAttrib *attrib = new ColorAttrib(T_flat, color);
00054   return return_new(attrib);
00055 }
00056 
00057 ////////////////////////////////////////////////////////////////////
00058 //     Function: ColorAttrib::make_off
00059 //       Access: Published, Static
00060 //  Description: Constructs a new ColorAttrib object that indicates
00061 //               geometry should be rendered in white.
00062 ////////////////////////////////////////////////////////////////////
00063 CPT(RenderAttrib) ColorAttrib::
00064 make_off() {
00065   if (_off != 0) {
00066     return _off;
00067   }
00068   ColorAttrib *attrib = new ColorAttrib(T_off, LColor(1.0f, 1.0f, 1.0f, 1.0f));
00069   _off = return_new(attrib);
00070   return _off;
00071 }
00072 
00073 ////////////////////////////////////////////////////////////////////
00074 //     Function: ColorAttrib::make_default
00075 //       Access: Published, Static
00076 //  Description: Returns a RenderAttrib that corresponds to whatever
00077 //               the standard default properties for render attributes
00078 //               of this type ought to be.
00079 ////////////////////////////////////////////////////////////////////
00080 CPT(RenderAttrib) ColorAttrib::
00081 make_default() {
00082   return make_off();
00083 }
00084 
00085 ////////////////////////////////////////////////////////////////////
00086 //     Function: ColorAttrib::output
00087 //       Access: Public, Virtual
00088 //  Description: 
00089 ////////////////////////////////////////////////////////////////////
00090 void ColorAttrib::
00091 output(ostream &out) const {
00092   out << get_type() << ":";
00093   switch (get_color_type()) {
00094   case T_vertex:
00095     out << "vertex";
00096     break;
00097 
00098   case T_flat:
00099     out << "(" << get_color() << ")";
00100     break;
00101 
00102   case T_off:
00103     out << "off";
00104     break;
00105   }
00106 }
00107 
00108 ////////////////////////////////////////////////////////////////////
00109 //     Function: ColorAttrib::compare_to_impl
00110 //       Access: Protected, Virtual
00111 //  Description: Intended to be overridden by derived ColorAttrib
00112 //               types to return a unique number indicating whether
00113 //               this ColorAttrib is equivalent to the other one.
00114 //
00115 //               This should return 0 if the two ColorAttrib objects
00116 //               are equivalent, a number less than zero if this one
00117 //               should be sorted before the other one, and a number
00118 //               greater than zero otherwise.
00119 //
00120 //               This will only be called with two ColorAttrib
00121 //               objects whose get_type() functions return the same.
00122 ////////////////////////////////////////////////////////////////////
00123 int ColorAttrib::
00124 compare_to_impl(const RenderAttrib *other) const {
00125   const ColorAttrib *ta;
00126   DCAST_INTO_R(ta, other, 0);
00127   if (_type != ta->_type) {
00128     return (int)_type - (int)ta->_type;
00129   }
00130   if (_type == T_flat) {
00131     return _color.compare_to(ta->_color);
00132   }
00133   return 0;
00134 }
00135 
00136 ////////////////////////////////////////////////////////////////////
00137 //     Function: ColorAttrib::get_hash_impl
00138 //       Access: Protected, Virtual
00139 //  Description: Intended to be overridden by derived RenderAttrib
00140 //               types to return a unique hash for these particular
00141 //               properties.  RenderAttribs that compare the same with
00142 //               compare_to_impl(), above, should return the same
00143 //               hash; RenderAttribs that compare differently should
00144 //               return a different hash.
00145 ////////////////////////////////////////////////////////////////////
00146 size_t ColorAttrib::
00147 get_hash_impl() const {
00148   size_t hash = 0;
00149   hash = int_hash::add_hash(hash, (int)_type);
00150   if (_type == T_flat) {
00151     hash = _color.add_hash(hash);
00152   }
00153   return hash;
00154 }
00155 
00156 ////////////////////////////////////////////////////////////////////
00157 //     Function: ColorAttrib::get_auto_shader_attrib_impl
00158 //       Access: Protected, Virtual
00159 //  Description: 
00160 ////////////////////////////////////////////////////////////////////
00161 CPT(RenderAttrib) ColorAttrib::
00162 get_auto_shader_attrib_impl(const RenderState *state) const {
00163   // For a ColorAttrib, the only relevant information is the type: is
00164   // it flat-shaded or vertex-shaded?  The actual color value is read
00165   // by the shader from the graphics state.
00166 
00167   ColorAttrib *attrib = new ColorAttrib(_type, LColor(1.0f, 1.0f, 1.0f, 1.0f));
00168   return return_new(attrib);
00169 }
00170 
00171 ////////////////////////////////////////////////////////////////////
00172 //     Function: ColorAttrib::quantize_color
00173 //       Access: Private
00174 //  Description: Quantizes the color color to the nearest multiple of
00175 //               1000, just to prevent runaway accumulation of
00176 //               only slightly-different ColorAttribs.
00177 ////////////////////////////////////////////////////////////////////
00178 void ColorAttrib::
00179 quantize_color() {
00180   switch (_type) {
00181   case T_flat:
00182     _color[0] = cfloor(_color[0] * 1000.0f + 0.5f) * 0.001f;
00183     _color[1] = cfloor(_color[1] * 1000.0f + 0.5f) * 0.001f;
00184     _color[2] = cfloor(_color[2] * 1000.0f + 0.5f) * 0.001f;
00185     _color[3] = cfloor(_color[3] * 1000.0f + 0.5f) * 0.001f;
00186     break;
00187 
00188   case T_off:
00189     _color.set(1.0f, 1.0f, 1.0f, 1.0f);
00190     break;
00191 
00192   case T_vertex:
00193     _color.set(0.0f, 0.0f, 0.0f, 0.0f);
00194     break;
00195   }
00196 }
00197 
00198 ////////////////////////////////////////////////////////////////////
00199 //     Function: ColorAttrib::register_with_read_factory
00200 //       Access: Public, Static
00201 //  Description: Tells the BamReader how to create objects of type
00202 //               ColorAttrib.
00203 ////////////////////////////////////////////////////////////////////
00204 void ColorAttrib::
00205 register_with_read_factory() {
00206   BamReader::get_factory()->register_factory(get_class_type(), make_from_bam);
00207 }
00208 
00209 ////////////////////////////////////////////////////////////////////
00210 //     Function: ColorAttrib::write_datagram
00211 //       Access: Public, Virtual
00212 //  Description: Writes the contents of this object to the datagram
00213 //               for shipping out to a Bam file.
00214 ////////////////////////////////////////////////////////////////////
00215 void ColorAttrib::
00216 write_datagram(BamWriter *manager, Datagram &dg) {
00217   RenderAttrib::write_datagram(manager, dg);
00218 
00219   dg.add_int8(_type);
00220   _color.write_datagram(dg);
00221 }
00222 
00223 ////////////////////////////////////////////////////////////////////
00224 //     Function: ColorAttrib::make_from_bam
00225 //       Access: Protected, Static
00226 //  Description: This function is called by the BamReader's factory
00227 //               when a new object of type ColorAttrib is encountered
00228 //               in the Bam file.  It should create the ColorAttrib
00229 //               and extract its information from the file.
00230 ////////////////////////////////////////////////////////////////////
00231 TypedWritable *ColorAttrib::
00232 make_from_bam(const FactoryParams &params) {
00233   ColorAttrib *attrib = new ColorAttrib(T_off, LColor::zero());
00234   DatagramIterator scan;
00235   BamReader *manager;
00236 
00237   parse_params(params, scan, manager);
00238   attrib->fillin(scan, manager);
00239 
00240   return attrib;
00241 }
00242 
00243 ////////////////////////////////////////////////////////////////////
00244 //     Function: ColorAttrib::fillin
00245 //       Access: Protected
00246 //  Description: This internal function is called by make_from_bam to
00247 //               read in all of the relevant data from the BamFile for
00248 //               the new ColorAttrib.
00249 ////////////////////////////////////////////////////////////////////
00250 void ColorAttrib::
00251 fillin(DatagramIterator &scan, BamReader *manager) {
00252   RenderAttrib::fillin(scan, manager);
00253 
00254   _type = (Type)scan.get_int8();
00255   _color.read_datagram(scan);
00256   quantize_color();
00257 }
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