source/builders/primitivebuilder.cpp

   1 #include "error.h"
   2 #include "primitivebuilder.h"
   3
   4 using namespace std;
   5
   6 namespace Msp {
   7 namespace GL {
   8
   9 PrimitiveBuilder::PrimitiveBuilder(VertexArray &a):
  10         array(a),
  11         vab(array),
  12         in_batch(false),
  13         offs(0)
  14 { }
  15
  16 void PrimitiveBuilder::begin(PrimitiveType t)
  17 {
  18         if(in_batch)
  19                 throw invalid_operation("PrimitiveBuilder::begin");
  20
  21         type = t;
  22         in_batch = true;
  23
  24         begin_();
  25 }
  26
  27 void PrimitiveBuilder::end()
  28 {
  29         if(!in_batch)
  30                 throw invalid_operation("PrimitiveBuilder::end");
  31
  32         in_batch = false;
  33
  34         end_();
  35 }
  36
  37 void PrimitiveBuilder::offset(unsigned o)
  38 {
  39         if(o>array.size())
  40                 throw out_of_range("PrimitiveBuilder::offset");
  41         offs = o;
  42 }
  43
  44 void PrimitiveBuilder::element(unsigned i)
  45 {
  46         if(!in_batch)
  47                 throw invalid_operation("PrimitiveBuilder::element");
  48         if(offs+i>=array.size())
  49                 throw out_of_range("PrimitiveBuilder::element");
  50         element_(offs+i);
  51 }
  52
  53 PrimitiveType PrimitiveBuilder::get_type() const
  54 {
  55         if(!in_batch)
  56                 throw invalid_operation("PrimitiveBuilder::get_type");
  57         return type;
  58 }
  59
  60 void PrimitiveBuilder::vertex_(const Vector4 &v)
  61 {
  62         const VertexFormat &format = array.get_format();
  63         for(const unsigned char *a=format.begin(); a!=format.end(); ++a)
  64         {
  65                 unsigned sem = get_attribute_semantic(*a);
  66                 if(sem<attr.size())
  67                         vab.attrib(sem, attr[sem]);
  68         }
  69         vab.vertex(v);
  70
  71         if(in_batch)
  72                 element_(array.size()-1);
  73 }
  74
  75 } // namespace GL
  76 } // namespace Msp