local w, h = guiGetScreenSize()
local keys = {
    "vehicle_right", "vehicle_left",
    "vehicle_look_right", "vehicle_look_left",
    "special_control_right", "special_control_left",
    "left", "right",
}

screenSrc = dxCreateScreenSource(w, h)
renderEffect = addEventHandler("onClientPreRender", root, function()
    local x, y, z, lx, ly, lz = getCameraMatrix()
    x, lx, y, ly = -x, -lx, -y, -ly

    setCameraMatrix (x, y, z, lx, ly, lz)
    for _, key in pairs(keys) do
        bindKey(key, "both", invertedKeys)
        toggleControl(key, false)
    end
    dxUpdateScreenSource(screenSrc)
    dxDrawImage(w, 0, -w, h,screenSrc)
end)

function invertedKeys(key, state)
    local s, e = key:find("right") and key:find("right") or key:find("left")
    local dir = key:sub(s, e)
    local newkey = key:gsub(dir, (dir == "right" and "left" or "right"))
    local enabledControl = (state == "down" and true or false)
    setControlState(newkey, enabledControl)
end

addEventHandler("onClientResourceStop", resourceRoot, function()
    for _, key in pairs(keys) do
        unbindKey(key, "both", invertedKeys)
        toggleControl(key, true)
    end
    removeEventHandler("onClientHUDRender", getRootElement(), renderEffect)
end)