code: func BlendFuncSeparate(sfactorRGB uint32, dfactorRGB uint32, sfactorAlpha uint32, dfactorAlpha uint32) {
  	C.glowBlendFuncSeparate(gpBlendFuncSeparate, (C.GLenum)(sfactorRGB), (C.GLenum)(dfactorRGB), (C.GLenum)(sfactorAlpha), (C.GLenum)(dfactorAlpha))
  }
docs: // specify pixel arithmetic for RGB and alpha components separately