source/core/vertexformat.cpp

   1 #include <msp/strings/format.h>
   2 #include "error.h"
   3 #include "vertexformat.h"
   4
   5 using namespace std;
   6
   7 namespace Msp {
   8 namespace GL {
   9
  10 VertexFormat::VertexFormat():
  11         count(0)
  12 { }
  13
  14 VertexFormat::VertexFormat(VertexAttribute a):
  15         count(1)
  16 {
  17         attributes[0] = a;
  18 }
  19
  20 VertexFormat VertexFormat::operator,(VertexAttribute a) const
  21 {
  22         if(count>=MAX_ATTRIBUTES)
  23                 throw invalid_operation("VertexFormat::operator,");
  24
  25         VertexFormat r = *this;
  26         r.attributes[r.count++] = a;
  27
  28         return r;
  29 }
  30
  31 VertexFormat VertexFormat::operator,(DataType t) const
  32 {
  33         if(!count)
  34                 throw invalid_operation("VertexFormat::operator,");
  35
  36         VertexFormat r = *this;
  37         VertexAttribute &a = r.attributes[r.count-1];
  38         a = make_typed_attribute(a, t);
  39
  40         return r;
  41 }
  42
  43 VertexFormat VertexFormat::operator,(unsigned i) const
  44 {
  45         if(!count)
  46                 throw invalid_operation("VertexFormat::operator,");
  47
  48         VertexFormat r = *this;
  49         VertexAttribute &a = r.attributes[r.count-1];
  50         a = make_indexed_attribute(a, i);
  51
  52         return r;
  53 }
  54
  55 bool VertexFormat::operator==(const VertexFormat &other) const
  56 {
  57         if(count!=other.count)
  58                 return false;
  59         return equal(attributes, attributes+count, other.attributes);
  60 }
  61
  62 unsigned VertexFormat::stride() const
  63 {
  64         unsigned s = 0;
  65         for(VertexAttribute a: *this)
  66                 s += get_attribute_size(a);
  67         return s;
  68 }
  69
  70 int VertexFormat::offset(VertexAttribute attr) const
  71 {
  72         unsigned sem = get_attribute_semantic(attr);
  73         unsigned offs = 0;
  74         for(VertexAttribute a: *this)
  75         {
  76                 if(get_attribute_semantic(a)==sem)
  77                 {
  78                         if(get_attribute_source_type(a)==get_attribute_source_type(attr) &&
  79                                 get_attribute_component_count(a)>=get_attribute_component_count(attr))
  80                                 return offs;
  81                         else
  82                                 return -1;
  83                 }
  84                 else
  85                         offs += get_attribute_size(a);
  86         }
  87
  88         return -1;
  89 }
  90
  91
  92 VertexAttribute make_typed_attribute(VertexAttribute attr, DataType type)
  93 {
  94         if(is_matrix(type) || is_vector(type) || is_image(type))
  95                 throw invalid_argument("make_typed_attribute");
  96         if(is_integer_attribute(attr) && is_float(type))
  97                 throw invalid_argument("make_typed_attribute");
  98
  99         return static_cast<VertexAttribute>((attr&0xFC0F) | (type&0x0F)<<4 | (type&0x300)>>1);
 100 }
 101
 102 VertexAttribute make_indexed_attribute(VertexAttribute attr, unsigned index)
 103 {
 104         VertexAttribute base = attr;
 105         if(get_attribute_semantic(attr)==get_attribute_semantic(TEXCOORD1))
 106         {
 107                 if(index>=4)
 108                         throw out_of_range("make_indexed_attribute");
 109         }
 110         else if(get_attribute_semantic(attr)==get_attribute_semantic(RAW_ATTRIB1))
 111                 base = static_cast<VertexAttribute>(base&0x3FF);
 112         else if(get_attribute_semantic(attr)!=get_attribute_semantic(GENERIC1))
 113                 throw invalid_argument("make_indexed_attribute");
 114
 115         if(get_attribute_semantic(base)+index>=63)
 116                 throw out_of_range("make_indexed_attribute");
 117
 118         return static_cast<VertexAttribute>(base+(index<<10));
 119 }
 120
 121
 122 bool convert_attribute_type(string::const_iterator &i, string::const_iterator end, const char *name, VertexAttribute &attr, DataType type)
 123 {
 124         auto j = i;
 125         for(; (j!=end && *j!='_' && *name); ++name, ++j)
 126                 if(*j!=*name)
 127                         return false;
 128
 129         attr = make_typed_attribute(attr, type);
 130         i = j;
 131
 132         return true;
 133 }
 134
 135 bool convert_attribute(const string &str, const char *name, int min_size, int max_size, VertexAttribute &attr, VertexAttribute base_attr)
 136 {
 137         auto i = str.begin();
 138         for(; *name; ++name, ++i)
 139                 if(*i!=*name)
 140                         return false;
 141
 142         VertexAttribute result = base_attr;
 143
 144         if(i!=str.end() && *i=='_')
 145         {
 146                 if(*(++i)++!='I')
 147                         return false;
 148                 result = static_cast<VertexAttribute>(result|8);
 149         }
 150
 151         if(i==str.end() || *i<'0'+min_size || *i>'0'+max_size)
 152                 return false;
 153         result = static_cast<VertexAttribute>(result+(*i++-'0'-min_size));
 154
 155         while(i!=str.end())
 156         {
 157                 if(*i!='_' || ++i==str.end())
 158                         return false;
 159
 160                 if(isdigit(*i))
 161                 {
 162                         unsigned index = 0;
 163                         for(; (i!=str.end() && isdigit(*i)); ++i)
 164                                 index = index*10+(*i-'0');
 165                         result = make_indexed_attribute(result, index);
 166                 }
 167                 else if(convert_attribute_type(i, str.end(), "UBYTE", result, UNSIGNED_BYTE) ||
 168                         convert_attribute_type(i, str.end(), "BYTE", result, BYTE) ||
 169                         convert_attribute_type(i, str.end(), "USHORT", result, UNSIGNED_SHORT) ||
 170                         convert_attribute_type(i, str.end(), "SHORT", result, SHORT) ||
 171                         convert_attribute_type(i, str.end(), "UINT", result, UNSIGNED_INT) ||
 172                         convert_attribute_type(i, str.end(), "INT", result, INT) ||
 173                         convert_attribute_type(i, str.end(), "FLOAT", result, FLOAT))
 174                         ;
 175                 else
 176                         return false;
 177         }
 178
 179         attr = result;
 180         return true;
 181 }
 182
 183 void operator>>(const LexicalConverter &conv, VertexAttribute &a)
 184 {
 185         const string &str = conv.get();
 186         try
 187         {
 188                 if(convert_attribute(str, "VERTEX", 2, 4, a, VERTEX2) ||
 189                         convert_attribute(str, "COLOR", 3, 4, a, COLOR3) ||
 190                         convert_attribute(str, "NORMAL", 3, 3, a, NORMAL3) ||
 191                         convert_attribute(str, "TANGENT", 3, 3, a, TANGENT3) ||
 192                         convert_attribute(str, "GROUP", 1, 4, a, GROUP1) ||
 193                         convert_attribute(str, "WEIGHT", 1, 4, a, WEIGHT1) ||
 194                         convert_attribute(str, "TEXCOORD", 1, 4, a, TEXCOORD1) ||
 195                         convert_attribute(str, "GENERIC", 1, 4, a, GENERIC1))
 196                         return;
 197         }
 198         catch(...)
 199         { }
 200
 201         throw lexical_error(format("conversion of '%s' to VertexAttribute", str));
 202 }
 203
 204 } // namespace GL
 205 } // namespace Msp