source/windingtest.cpp

   1 #include <msp/strings/format.h>
   2 #include "windingtest.h"
   3
   4 namespace Msp {
   5 namespace GL {
   6
   7 void operator>>(const LexicalConverter &conv, FaceWinding &winding)
   8 {
   9         if(conv.get()=="CLOCKWISE")
  10                 winding = CLOCKWISE;
  11         else if(conv.get()=="COUNTERCLOCKWISE")
  12                 winding = COUNTERCLOCKWISE;
  13         else
  14                 throw lexical_error(format("conversion of '%s' to FaceWinding", conv.get()));
  15 }
  16
  17 WindingTest::WindingTest():
  18         winding(COUNTERCLOCKWISE)
  19 { }
  20
  21 WindingTest::WindingTest(FaceWinding w):
  22         winding(w)
  23 { }
  24
  25 void WindingTest::bind() const
  26 {
  27         if(set_current(this))
  28         {
  29                 glEnable(GL_CULL_FACE);
  30                 glFrontFace(winding);
  31         }
  32 }
  33
  34 void WindingTest::unbind()
  35 {
  36         if(set_current(0))
  37                 glDisable(GL_CULL_FACE);
  38 }
  39
  40 const WindingTest &WindingTest::get_reverse() const
  41 {
  42         if(winding==CLOCKWISE)
  43                 return counterclockwise();
  44         else
  45                 return clockwise();
  46 }
  47
  48 const WindingTest &WindingTest::clockwise()
  49 {
  50         static WindingTest test(CLOCKWISE);
  51         return test;
  52 }
  53
  54 const WindingTest &WindingTest::counterclockwise()
  55 {
  56         static WindingTest test(COUNTERCLOCKWISE);
  57         return test;
  58 }
  59
  60 } // namespace GL
  61 } // namespace Msp