static float f = 0.0f;
	ImGuiWindowFlags window_flags = 0;
	window_flags |= ImGuiWindowFlags_NoResize;
	window_flags |= ImGuiWindowFlags_NoCollapse;
	window_flags |= ImGuiWindowFlags_MenuBar;
	ImGuiWindowFlags window_flags_about = 0;
	window_flags_about |= ImGuiWindowFlags_NoResize;
	window_flags_about |= ImGuiWindowFlags_NoCollapse;
	window_flags_about |= ImGuiWindowFlags_NoMove;
	ImGui::SetNextWindowSize(ImVec2(700.f, 335.f), ImGuiSetCond_FirstUseEver);