source/blend.cpp

   1 #include "blend.h"
   2 #include "extension.h"
   3 #include "version_1_2.h"
   4
   5 namespace Msp {
   6 namespace GL {
   7
   8 Blend::Blend():
   9         eq(ADD),
  10         src_factor(ONE),
  11         dst_factor(ZERO)
  12 { }
  13
  14 Blend::Blend(BlendFactor sf, BlendFactor df):
  15         eq(ADD),
  16         src_factor(sf),
  17         dst_factor(df)
  18 { }
  19
  20 Blend::Blend(BlendEquation e, BlendFactor sf, BlendFactor df):
  21         eq(e),
  22         src_factor(sf),
  23         dst_factor(df)
  24 {
  25         if(eq!=ADD)
  26                 static RequireVersion _ver(1, 2);
  27 }
  28
  29 void Blend::bind() const
  30 {
  31         if(set_current(this))
  32         {
  33                 glEnable(GL_BLEND);
  34                 if(glBlendEquation)
  35                         glBlendEquation(eq);
  36                 glBlendFunc(src_factor, dst_factor);
  37         }
  38 }
  39
  40 void Blend::unbind()
  41 {
  42         if(set_current(0))
  43                 glDisable(GL_BLEND);
  44 }
  45
  46 const Blend &Blend::alpha()
  47 {
  48         static Blend blend(SRC_ALPHA, ONE_MINUS_SRC_ALPHA);
  49         return blend;
  50 }
  51
  52 } // namespace GL
  53 } // namespace Msp