source/blend.h

   1 #ifndef MSP_GL_BLEND_H_
   2 #define MSP_GL_BLEND_H_
   3
   4 #include "bindable.h"
   5 #include "gl.h"
   6
   7 namespace Msp {
   8 namespace GL {
   9
  10 enum BlendEquation
  11 {
  12         ADD              = GL_FUNC_ADD,
  13         SUBTRACT         = GL_FUNC_SUBTRACT,
  14         REVERSE_SUBTRACT = GL_FUNC_REVERSE_SUBTRACT,
  15         MIN              = GL_MIN,
  16         MAX              = GL_MAX
  17 };
  18
  19 enum BlendFactor
  20 {
  21         ZERO = GL_ZERO,
  22         ONE = GL_ONE,
  23         SRC_COLOR = GL_SRC_COLOR,
  24         ONE_MINUS_SRC_COLOR = GL_ONE_MINUS_SRC_COLOR,
  25         SRC_ALPHA = GL_SRC_ALPHA,
  26         ONE_MINUS_SRC_ALPHA = GL_ONE_MINUS_SRC_ALPHA,
  27         DST_COLOR = GL_DST_COLOR,
  28         ONE_MINUS_DST_COLOR = GL_ONE_MINUS_DST_COLOR,
  29         DST_ALPHA = GL_DST_ALPHA,
  30         ONE_MINUS_DST_ALPHA = GL_ONE_MINUS_DST_ALPHA,
  31         CONSTANT_COLOR = GL_CONSTANT_COLOR,
  32         ONE_MINUS_CONSTANT_COLOR = GL_ONE_MINUS_CONSTANT_COLOR,
  33         CONSTANT_ALPHA = GL_CONSTANT_ALPHA,
  34         ONE_MINUS_CONSTANT_ALPHA = GL_ONE_MINUS_CONSTANT_ALPHA
  35 };
  36
  37 /**
  38 Blends incoming fragments with those already in the framebuffer.
  39 */
  40 class Blend: public Bindable<Blend>
  41 {
  42 private:
  43         BlendEquation eq;
  44         BlendFactor src_factor;
  45         BlendFactor dst_factor;
  46
  47 public:
  48         Blend();
  49         Blend(BlendFactor, BlendFactor);
  50         Blend(BlendEquation, BlendFactor, BlendFactor);
  51
  52         void bind() const;
  53
  54         static void unbind();
  55
  56         static const Blend &alpha();
  57 };
  58
  59 } // namespace GL
  60 } // namespace Msp
  61
  62 #endif