source/core/vertexformat.cpp

   1 #include <algorithm>
   2 #include <msp/io/print.h>
   3 #include <msp/strings/format.h>
   4 #include <msp/strings/lexicalcast.h>
   5 #include <msp/strings/utils.h>
   6 #include "error.h"
   7 #include "vertexformat.h"
   8
   9 using namespace std;
  10
  11 namespace Msp {
  12 namespace GL {
  13
  14 VertexFormat::VertexFormat():
  15         count(0)
  16 { }
  17
  18 VertexFormat::VertexFormat(VertexAttribute a):
  19         count(1)
  20 {
  21         attributes[0] = a;
  22 }
  23
  24 VertexFormat VertexFormat::operator,(VertexAttribute a) const
  25 {
  26         if(count>=MAX_ATTRIBUTES)
  27                 throw invalid_operation("VertexFormat::operator,");
  28
  29         VertexFormat r = *this;
  30         r.attributes[r.count++] = a;
  31
  32         return r;
  33 }
  34
  35 VertexFormat VertexFormat::operator,(DataType t) const
  36 {
  37         if(!count)
  38                 throw invalid_operation("VertexFormat::operator,");
  39
  40         VertexFormat r = *this;
  41         UInt16 &a = r.attributes[r.count-1];
  42         a = make_typed_attribute(static_cast<VertexAttribute>(a), t);
  43
  44         return r;
  45 }
  46
  47 VertexFormat VertexFormat::operator,(unsigned i) const
  48 {
  49         if(!count)
  50                 throw invalid_operation("VertexFormat::operator,");
  51
  52         VertexFormat r = *this;
  53         UInt16 &a = r.attributes[r.count-1];
  54         a = make_indexed_attribute(static_cast<VertexAttribute>(a), i);
  55
  56         return r;
  57 }
  58
  59 bool VertexFormat::operator==(const VertexFormat &other) const
  60 {
  61         if(count!=other.count)
  62                 return false;
  63         return equal(attributes, attributes+count, other.attributes);
  64 }
  65
  66 unsigned VertexFormat::stride() const
  67 {
  68         unsigned s = 0;
  69         for(const UInt16 *i=begin(); i!=end(); ++i)
  70                 s += get_attribute_size(*i);
  71         return s;
  72 }
  73
  74 int VertexFormat::offset(VertexAttribute attr) const
  75 {
  76         unsigned sem = get_attribute_semantic(attr);
  77         unsigned offs = 0;
  78         for(const UInt16 *i=begin(); i!=end(); ++i)
  79         {
  80                 if(get_attribute_semantic(*i)==sem)
  81                 {
  82                         if(get_attribute_source_type(*i)==get_attribute_source_type(attr) &&
  83                                 get_attribute_component_count(*i)>=get_attribute_component_count(attr))
  84                                 return offs;
  85                         else
  86                                 return -1;
  87                 }
  88                 else
  89                         offs += get_attribute_size(*i);
  90         }
  91
  92         return -1;
  93 }
  94
  95
  96 VertexAttribute make_typed_attribute(VertexAttribute attr, DataType type)
  97 {
  98         if(is_matrix(type) || is_vector(type) || is_image(type))
  99                 throw invalid_argument("make_typed_attribute");
 100
 101         return static_cast<VertexAttribute>((attr&0xFC0F) | (type&0x0F)<<4 | (type&0x300)>>1);
 102 }
 103
 104 VertexAttribute make_indexed_attribute(VertexAttribute attr, unsigned index)
 105 {
 106         unsigned base = attr;
 107         if(get_attribute_semantic(attr)==get_attribute_semantic(TEXCOORD1))
 108         {
 109                 if(index>=4)
 110                         throw out_of_range("make_indexed_attribute");
 111         }
 112         else if(get_attribute_semantic(attr)==get_attribute_semantic(RAW_ATTRIB1))
 113                 base &= 0x3FF;
 114         else if(get_attribute_semantic(attr)!=get_attribute_semantic(GENERIC1))
 115                 throw invalid_argument("make_indexed_attribute");
 116
 117         if(get_attribute_semantic(base)+index>=63)
 118                 throw out_of_range("make_indexed_attribute");
 119
 120         return static_cast<VertexAttribute>(base+(index<<10));
 121 }
 122
 123
 124 bool convert_attribute_type(string::const_iterator &i, string::const_iterator end, const char *name, VertexAttribute &attr, DataType type)
 125 {
 126         string::const_iterator j = i;
 127         for(; (j!=end && *j!='_' && *name); ++name, ++j)
 128                 if(*j!=*name)
 129                         return false;
 130
 131         attr = make_typed_attribute(attr, type);
 132         i = j;
 133
 134         return true;
 135 }
 136
 137 bool convert_attribute(const string &str, const char *name, int min_size, int max_size, VertexAttribute &attr, VertexAttribute base_attr)
 138 {
 139         string::const_iterator i = str.begin();
 140         for(; *name; ++name, ++i)
 141                 if(*i!=*name)
 142                         return false;
 143         if(i==str.end() || *i<'0'+min_size || *i>'0'+max_size)
 144                 return false;
 145         VertexAttribute result = static_cast<VertexAttribute>(base_attr+(*i++-'0'-min_size));
 146
 147         while(i!=str.end())
 148         {
 149                 if(*i!='_' || ++i==str.end())
 150                         return false;
 151
 152                 if(isdigit(*i))
 153                 {
 154                         unsigned index = 0;
 155                         for(; (i!=str.end() && isdigit(*i)); ++i)
 156                                 index = index*10+(*i-'0');
 157                         result = make_indexed_attribute(result, index);
 158                 }
 159                 else if(convert_attribute_type(i, str.end(), "UBYTE", result, UNSIGNED_BYTE) ||
 160                         convert_attribute_type(i, str.end(), "BYTE", result, BYTE) ||
 161                         convert_attribute_type(i, str.end(), "USHORT", result, UNSIGNED_SHORT) ||
 162                         convert_attribute_type(i, str.end(), "SHORT", result, SHORT) ||
 163                         convert_attribute_type(i, str.end(), "UINT", result, UNSIGNED_INT) ||
 164                         convert_attribute_type(i, str.end(), "INT", result, INT) ||
 165                         convert_attribute_type(i, str.end(), "FLOAT", result, FLOAT))
 166                         ;
 167                 else
 168                         return false;
 169         }
 170
 171         attr = result;
 172         return true;
 173 }
 174
 175 void operator>>(const LexicalConverter &conv, VertexAttribute &a)
 176 {
 177         const string &str = conv.get();
 178         try
 179         {
 180                 if(convert_attribute(str, "VERTEX", 2, 4, a, VERTEX2) ||
 181                         convert_attribute(str, "COLOR", 3, 4, a, COLOR3) ||
 182                         convert_attribute(str, "NORMAL", 3, 3, a, NORMAL3) ||
 183                         convert_attribute(str, "TANGENT", 3, 3, a, TANGENT3) ||
 184                         convert_attribute(str, "GROUP", 1, 4, a, GROUP1) ||
 185                         convert_attribute(str, "WEIGHT", 1, 4, a, WEIGHT1) ||
 186                         convert_attribute(str, "TEXCOORD", 1, 4, a, TEXCOORD1) ||
 187                         convert_attribute(str, "GENERIC", 1, 4, a, GENERIC1))
 188                         return;
 189         }
 190         catch(...)
 191         { }
 192
 193         throw lexical_error(format("conversion of '%s' to VertexAttribute", str));
 194 }
 195
 196 } // namespace GL
 197 } // namespace Msp