source/vertexformat.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgl
   4 Copyright © 2007-2010  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include <cstring>
   9 #include <msp/strings/lexicalcast.h>
  10 #include <msp/strings/utils.h>
  11 #include "except.h"
  12 #include "vertexformat.h"
  13
  14 using namespace std;
  15
  16 namespace Msp {
  17 namespace GL {
  18
  19 VertexFormat::VertexFormat():
  20         data(0)
  21 { }
  22
  23 VertexFormat::VertexFormat(VertexComponent c):
  24         data(new unsigned char[8])
  25 {
  26         data[0] = 1;
  27         data[1] = c;
  28 }
  29
  30 VertexFormat::VertexFormat(const VertexFormat &f):
  31         data(0)
  32 {
  33         if(f.data)
  34         {
  35                 data = new unsigned char[(f.data[0]&~7)+8];
  36                 memcpy(data, f.data, f.data[0]+1);
  37         }
  38 }
  39
  40 VertexFormat &VertexFormat::operator=(const VertexFormat &f)
  41 {
  42         delete[] data;
  43         if(f.data)
  44         {
  45                 data = new unsigned char[(f.data[0]&~7)+8];
  46                 memcpy(data, f.data, f.data[0]+1);
  47         }
  48         else
  49                 data = 0;
  50
  51         return *this;
  52 }
  53
  54 VertexFormat::~VertexFormat()
  55 {
  56         delete[] data;
  57 }
  58
  59 unsigned VertexFormat::stride() const
  60 {
  61         unsigned s = 0;
  62         for(const unsigned char *i=begin(); i!=end(); ++i)
  63                 s += (*i&3)+1;
  64         return s;
  65 }
  66
  67 int VertexFormat::offset(VertexComponent comp, unsigned index) const
  68 {
  69         if((comp<TEXCOORD1 && index>0) || (comp<ATTRIB1 && index>=8) || index>=53)
  70                 throw InvalidParameterValue("Vertex component index out of range");
  71
  72         unsigned type = (comp>>2)+index;
  73         unsigned size = comp&3;
  74         unsigned offs = 0;
  75         for(const unsigned char *i=begin(); i!=end(); ++i)
  76         {
  77                 if(static_cast<unsigned>(*i>>2)==type)
  78                 {
  79                         if((*i&3)>=size)
  80                                 return offs;
  81                         else
  82                                 return -1;
  83                 }
  84                 else
  85                         offs += (*i&3)+1;
  86         }
  87
  88         return -1;
  89 }
  90
  91 VertexFormat operator,(const VertexFormat &f, VertexComponent c)
  92 {
  93         VertexFormat r = f;
  94         if(r.data)
  95         {
  96                 const unsigned char n = ++r.data[0];
  97                 if((n&7)==7)
  98                 {
  99                         unsigned char *newdt = new unsigned char[n+9];
 100                         memcpy(newdt, r.data, n);
 101                         delete r.data;
 102                         r.data = newdt;
 103                 }
 104                 r.data[n] = c;
 105         }
 106         else
 107         {
 108                 r.data = new unsigned char[8];
 109                 r.data[0] = 1;
 110                 r.data[1] = c;
 111         }
 112
 113         return r;
 114 }
 115
 116 VertexFormat operator,(const VertexFormat &f, unsigned i)
 117 {
 118         if(!f.data)
 119                 throw InvalidState("VertexFormat has no components");
 120         VertexFormat r = f;
 121         unsigned char *c = r.data+r.data[0];
 122         if((*c<TEXCOORD1 && i>0) || (*c<ATTRIB1 && i>=8) || i>=53)
 123                 throw InvalidParameterValue("Vertex component index out of range");
 124         *c += i*4;
 125
 126         return r;
 127 }
 128
 129 void operator>>(const LexicalConverter &conv, VertexComponent &c)
 130 {
 131         const string &str = conv.get();
 132         if(str.size()==7 && !str.compare(0, 6, "VERTEX") && str[6]>='2' && str[6]<='4')
 133                 c = static_cast<VertexComponent>(VERTEX2+(str[6]-'2'));
 134         else if(str=="NORMAL3")
 135                 c = NORMAL3;
 136         else if(str.size()==12 && !str.compare(0, 5, "COLOR") && str[5]>='3' && str[5]<='4' && !str.compare(6, 6, "_FLOAT"))
 137                 c = static_cast<VertexComponent>(COLOR3_FLOAT+(str[5]-'3'));
 138         else if(str=="COLOR4_UBYTE")
 139                 c = COLOR4_UBYTE;
 140         else if(str.size()>=9 && !str.compare(0, 8, "TEXCOORD") && str[8]>='1' && str[8]<='4')
 141         {
 142                 if(str.size()==9)
 143                         c = static_cast<VertexComponent>(TEXCOORD1+(str[8]-'1'));
 144                 else if(str.size()==11 && str[9]=='_' && str[10]>='0' && str[10]<='7')
 145                         c = static_cast<VertexComponent>(TEXCOORD1+(str[8]-'1')+(str[10]-'0')*4);
 146                 else
 147                         throw LexicalError("Invalid texture unit in VertexComponent conversion");
 148         }
 149         else if(str.size()>=9 && !str.compare(0, 6, "ATTRIB") && str[6]>='1' && str[6]<='4' && str[7]=='_')
 150         {
 151                 unsigned n;
 152                 try
 153                 {
 154                         n = lexical_cast<unsigned>(str.substr(8));
 155                 }
 156                 catch(const LexicalError &)
 157                 {
 158                         throw LexicalError("Invalid attribute in VertexComponent conversion");
 159                 }
 160                 c = static_cast<VertexComponent>(ATTRIB1+(str[6]-'1')+n*4);
 161         }
 162         else
 163                 throw LexicalError("Invalid input in VertexComponent conversion");
 164 }
 165
 166 // XXX This will go away eventually
 167 void operator>>(const LexicalConverter &conv, VertexFormat &f)
 168 {
 169         vector<string> parts = split(conv.get(), '_');
 170         for(vector<string>::iterator i=parts.begin(); i!=parts.end(); ++i)
 171         {
 172                 if(*i=="COLOR4UB")
 173                         *i = "COLOR4_UBYTE";
 174                 else if(i->size()==7 && !i->compare(0, 5, "COLOR") && (*i)[6]=='F')
 175                         *i = i->substr(0, 6)+"_FLOAT";
 176                 else if(i->size()>=10 && !i->compare(0, 8, "TEXCOORD"))
 177                         *i = i->substr(0, 9)+"_"+i->substr(9);
 178                 else if(i->size()>=8 && !i->compare(0, 6, "ATTRIB"))
 179                         *i = i->substr(0, 7)+"_"+i->substr(7);
 180         }
 181
 182         for(vector<string>::iterator i=parts.begin(); i!=parts.end(); ++i)
 183                 f = (f, lexical_cast<VertexComponent>(*i));
 184 }
 185
 186 } // namespace GL
 187 } // namespace Msp