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