source/windingtest.cpp

   1 /* $Id$
   2
   3 This file is part of libmspgl
   4 Copyright © 2011  Mikko Rasa, Mikkosoft Productions
   5 Distributed under the LGPL
   6 */
   7
   8 #include "windingtest.h"
   9
  10 namespace Msp {
  11 namespace GL {
  12
  13 void operator>>(const LexicalConverter &conv, FaceWinding &winding)
  14 {
  15         if(conv.get()=="CLOCKWISE")
  16                 winding = CLOCKWISE;
  17         else if(conv.get()=="COUNTERCLOCKWISE")
  18                 winding = COUNTERCLOCKWISE;
  19         else
  20                 throw InvalidParameterValue("Invalid FaceWinding");
  21 }
  22
  23 WindingTest::WindingTest():
  24         test(false),
  25         winding(COUNTERCLOCKWISE)
  26 { }
  27
  28 WindingTest::WindingTest(FaceWinding w):
  29         test(true),
  30         winding(w)
  31 { }
  32
  33 void WindingTest::bind() const
  34 {
  35         if(set_current(this))
  36         {
  37                 if(test)
  38                 {
  39                         glEnable(GL_CULL_FACE);
  40                         glFrontFace(winding);
  41                 }
  42                 else
  43                         glDisable(GL_CULL_FACE);
  44         }
  45 }
  46
  47 void WindingTest::unbind()
  48 {
  49         if(set_current(0))
  50                 glDisable(GL_CULL_FACE);
  51 }
  52
  53 WindingTest &WindingTest::clockwise()
  54 {
  55         static WindingTest test(CLOCKWISE);
  56         return test;
  57 }
  58
  59 WindingTest &WindingTest::counterclockwise()
  60 {
  61         static WindingTest test(COUNTERCLOCKWISE);
  62         return test;
  63 }
  64
  65 } // namespace GL
  66 } // namespace Msp