source/builders/vertexarraybuilder.cpp

   1 #include <limits>
   2 #include "vertexarray.h"
   3 #include "vertexarraybuilder.h"
   4
   5 using namespace std;
   6
   7 namespace Msp {
   8 namespace GL {
   9
  10 VertexArrayBuilder::VertexArrayBuilder(VertexArray &a):
  11         array(a)
  12 { }
  13
  14 void VertexArrayBuilder::vertex_(const Vector4 &vtx)
  15 {
  16         char *ptr = array.append();
  17         for(VertexAttribute a: array.get_format())
  18         {
  19                 unsigned sem = get_attribute_semantic(a);
  20                 if(!is_padding(a) && sem<attr.size())
  21                 {
  22                         bool integer = is_integer_attribute(a);
  23                         DataType type = get_attribute_source_type(a);
  24                         unsigned cc = get_attribute_component_count(a);
  25
  26                         const Vector4 &value = (sem==0 ? vtx : attr[sem]);
  27                         if(type==UNSIGNED_BYTE)
  28                                 store_attribute<uint8_t>(ptr, value, !integer, cc);
  29                         else if(type==BYTE)
  30                                 store_attribute<int8_t>(ptr, value, !integer, cc);
  31                         else if(type==UNSIGNED_SHORT)
  32                                 store_attribute<uint16_t>(ptr, value, !integer, cc);
  33                         else if(type==SHORT)
  34                                 store_attribute<int16_t>(ptr, value, !integer, cc);
  35                         else if(type==UNSIGNED_INT)
  36                                 store_attribute<uint32_t>(ptr, value, !integer, cc);
  37                         else if(type==INT)
  38                                 store_attribute<int32_t>(ptr, value, !integer, cc);
  39                         else if(type==FLOAT)
  40                                 store_attribute<float>(ptr, value, false, cc);
  41                 }
  42
  43                 ptr += get_attribute_size(a);
  44         }
  45 }
  46
  47 template<typename T>
  48 void VertexArrayBuilder::store_attribute(char *ptr, const Vector4 &value, bool normalize, unsigned count)
  49 {
  50         T *tptr = reinterpret_cast<T *>(ptr);
  51         for(unsigned i=0; i<count; ++i)
  52         {
  53                 if(!numeric_limits<T>::is_integer || !normalize)
  54                         *tptr++ = value[i];
  55                 else if(numeric_limits<T>::is_signed)
  56                         *tptr++ = round(min(max(value[i], -1.0f), 1.0f)*numeric_limits<T>::max());
  57                 else
  58                         *tptr++ = round(min(max(value[i], 0.0f), 1.0f)*numeric_limits<T>::max());
  59         }
  60 }
  61
  62 } // namespace GL
  63 } // namespace Msp