source/core/blend.h

   1 #ifndef MSP_GL_BLEND_H_
   2 #define MSP_GL_BLEND_H_
   3
   4 #include <msp/datafile/objectloader.h>
   5 #include <msp/strings/lexicalcast.h>
   6 #include "color.h"
   7 #include "gl.h"
   8
   9 namespace Msp {
  10 namespace GL {
  11
  12 enum BlendEquation
  13 {
  14         ADD,
  15         SUBTRACT,
  16         REVERSE_SUBTRACT,
  17         MIN,
  18         MAX
  19 };
  20
  21 enum BlendFactor
  22 {
  23         ZERO,
  24         ONE,
  25         SRC_COLOR,
  26         ONE_MINUS_SRC_COLOR,
  27         SRC_ALPHA,
  28         ONE_MINUS_SRC_ALPHA,
  29         DST_COLOR,
  30         ONE_MINUS_DST_COLOR,
  31         DST_ALPHA,
  32         ONE_MINUS_DST_ALPHA,
  33         CONSTANT_COLOR,
  34         ONE_MINUS_CONSTANT_COLOR,
  35         CONSTANT_ALPHA,
  36         ONE_MINUS_CONSTANT_ALPHA
  37 };
  38
  39 /**
  40 Blends incoming fragments with those already in the framebuffer.
  41 */
  42 struct Blend
  43 {
  44         class Loader: public DataFile::ObjectLoader<Blend>
  45         {
  46         public:
  47                 Loader(Blend &);
  48
  49         private:
  50                 void constant(float, float, float, float);
  51                 void equation(BlendEquation);
  52                 void factors(BlendFactor, BlendFactor);
  53         };
  54
  55         bool enabled;
  56         BlendEquation equation;
  57         BlendFactor src_factor;
  58         BlendFactor dst_factor;
  59         Color constant;
  60
  61         Blend();
  62         Blend(BlendFactor, BlendFactor);
  63         Blend(BlendEquation, BlendFactor, BlendFactor);
  64 };
  65
  66 GLenum get_gl_blend_equation(BlendEquation);
  67 GLenum get_gl_blend_factor(BlendFactor);
  68
  69 void operator>>(const LexicalConverter &, BlendEquation &);
  70 void operator<<(LexicalConverter &, BlendEquation);
  71
  72 void operator>>(const LexicalConverter &, BlendFactor &);
  73 void operator<<(LexicalConverter &, BlendFactor);
  74
  75 } // namespace GL
  76 } // namespace Msp
  77
  78 #endif