function imgui.OnDrawFrame()
local sw, sh = getScreenResolution()
imgui.SetNextWindowPos(imgui.ImVec2(sw / 2, sh / 2), imgui.Cond.FirstUseEver, imgui.ImVec2(0.5, 0.5))
imgui.SetNextWindowSize(imgui.ImVec2(240, 300), imgui.Cond.FirstUseEver)
imgui.Begin('test', main_window_state)...