Check framebuffer status

framebuffer.cpp

GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
  if(status != GL_FRAMEBUFFER_COMPLETE) {
    std::string msg;
    switch(status) {
      case GL_FRAMEBUFFER_UNDEFINED: msg = "GL_FRAMEBUFFER_UNDEFINED"; break;
      case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT: msg = "GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT"; break;
      case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT: msg = "GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT"; break;
      case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER: msg = "GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER"; break;
      case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER: msg = "GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER"; break;
      case GL_FRAMEBUFFER_UNSUPPORTED: msg = "GL_FRAMEBUFFER_UNSUPPORTED"; break;
      case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE: msg = "GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE"; break;
      case GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS: msg = "GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS"; break;
      default: msg = "unknown"; break;
    };
    printf("error: framebuffer of resizer is not complete!\n");
    return false;
  }