source/vertexformat.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgl
   4 Copyright © 2007-2009  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <cstring>
   9 #include <msp/strings/lexicalcast.h>
  10 #include "except.h"
  11 #include "vertexformat.h"
  12
  13 using namespace std;
  14
  15 namespace Msp {
  16 namespace GL {
  17
  18 VertexFormat::VertexFormat():
  19         data(0)
  20 { }
  21
  22 VertexFormat::VertexFormat(VertexComponent c):
  23         data(new unsigned char[8])
  24 {
  25         data[0]=1;
  26         data[1]=c;
  27 }
  28
  29 VertexFormat::VertexFormat(const VertexFormat &f):
  30         data(0)
  31 {
  32         if(f.data)
  33         {
  34                 data=new unsigned char[f.data[0]/8+8];
  35                 memcpy(data, f.data, f.data[0]+1);
  36         }
  37 }
  38
  39 VertexFormat &VertexFormat::operator=(const VertexFormat &f)
  40 {
  41         delete[] data;
  42         if(f.data)
  43         {
  44                 data=new unsigned char[f.data[0]/8+8];
  45                 memcpy(data, f.data, f.data[0]+1);
  46         }
  47         else
  48                 data=0;
  49
  50         return *this;
  51 }
  52
  53 VertexFormat::~VertexFormat()
  54 {
  55         delete[] data;
  56 }
  57
  58 VertexFormat operator,(const VertexFormat &f, VertexComponent c)
  59 {
  60         VertexFormat r=f;
  61         if(r.data)
  62         {
  63                 const unsigned char n=++r.data[0];
  64                 if((n&7)==7)
  65                 {
  66                         unsigned char *newdt=new unsigned char[n+9];
  67                         memcpy(newdt, r.data, n);
  68                         delete r.data;
  69                         r.data=newdt;
  70                 }
  71                 r.data[n]=c;
  72         }
  73         else
  74         {
  75                 r.data=new unsigned char[8];
  76                 r.data[0]=1;
  77                 r.data[1]=c;
  78         }
  79
  80         return r;
  81 }
  82
  83 VertexFormat operator,(const VertexFormat &f, unsigned i)
  84 {
  85         if(!f.data)
  86                 throw InvalidState("VertexFormat has no components");
  87         VertexFormat r=f;
  88         unsigned char *c=r.data+r.data[0];
  89         if(*c<ATTRIB1)
  90                 throw InvalidState("Last component is not a generic attribute");
  91         // VertexArray uses an unsigned to store flags for enabled arrays
  92         if(i>=28)
  93                 throw InvalidParameterValue("Generic attribute index out of range");
  94         *c+=i*4;
  95
  96         return r;
  97 }
  98
  99 uint get_stride(const VertexFormat &f)
 100 {
 101         uint stride=0;
 102         for(const unsigned char *i=f.begin(); i!=f.end(); ++i)
 103                 stride+=(*i&3)+1;
 104         return stride;
 105 }
 106
 107 istream &operator>>(istream &in, VertexFormat &f)
 108 {
 109         string str;
 110         in>>str;
 111
 112         unsigned start=0;
 113
 114         while(1)
 115         {
 116                 string::size_type underscore=str.find('_', start);
 117                 bool fail=false;
 118                 if(!str.compare(start, underscore-start, "VERTEX2"))
 119                         f=(f,VERTEX2);
 120                 else if(!str.compare(start, underscore-start, "VERTEX3"))
 121                         f=(f,VERTEX3);
 122                 else if(!str.compare(start, underscore-start, "VERTEX4"))
 123                         f=(f,VERTEX4);
 124                 else if(!str.compare(start, underscore-start, "NORMAL3"))
 125                         f=(f,NORMAL3);
 126                 else if(!str.compare(start, underscore-start, "TEXCOORD1"))
 127                         f=(f,TEXCOORD1);
 128                 else if(!str.compare(start, underscore-start, "TEXCOORD2"))
 129                         f=(f,TEXCOORD2);
 130                 else if(!str.compare(start, underscore-start, "TEXCOORD3"))
 131                         f=(f,TEXCOORD3);
 132                 else if(!str.compare(start, underscore-start, "TEXCOORD4"))
 133                         f=(f,TEXCOORD4);
 134                 else if(!str.compare(start, underscore-start, "COLOR4UB"))
 135                         f=(f,COLOR4_UBYTE);
 136                 else if(!str.compare(start, underscore-start, "COLOR3F"))
 137                         f=(f,COLOR3_FLOAT);
 138                 else if(!str.compare(start, underscore-start, "COLOR4F"))
 139                         f=(f,COLOR4_FLOAT);
 140                 else if(underscore>=start+8 && !str.compare(start, 6, "ATTRIB"))
 141                 {
 142                         try
 143                         {
 144                                 char n=str[start+6];
 145                                 unsigned i=lexical_cast<unsigned>(str.substr(start+7, underscore-start-7));
 146                                 if(n=='1')
 147                                         f=(f,ATTRIB1,i);
 148                                 else if(n=='2')
 149                                         f=(f,ATTRIB2,i);
 150                                 else if(n=='3')
 151                                         f=(f,ATTRIB3,i);
 152                                 else if(n=='4')
 153                                         f=(f,ATTRIB4,i);
 154                                 else
 155                                         fail=true;
 156                         }
 157                         catch(const LexicalError &)
 158                         {
 159                                 fail=true;
 160                         }
 161                 }
 162                 else
 163                         fail=true;
 164
 165                 if(fail)
 166                 {
 167                         in.setstate(ios_base::failbit);
 168                         break;
 169                 }
 170
 171                 if(underscore==string::npos)
 172                         break;
 173                 start=underscore+1;
 174         }
 175
 176         return in;
 177 }
 178
 179 } // namespace GL
 180 } // namespace Msp