raiseTable = { "advshading 1", "shadows 1 1024", "water 1", "shadows 1 2048", "water 3", "shadows 4096",   "water 2" }
lowerTable = { "advshading 0", "shadows 0",      "water 0", "shadows 1 1024", "water 1", "shadows 1 2048", "water 3" }

maxFps = 40
minFps = 30

function widget:GetInfo()
  return {
    name      = "FPSManager",
    desc      = "fill",
    author    = "quantum",
    date      = "May 28, 2007",
    license   = "GNU GPL, v2 or later",
    layer     = 0,
    enabled   = false  --  loaded by default?
  }
end

counter       = 0
detailLevel   = 1
fpsTable      = {}
raisePoints   = 0
lowerPoints   = 0
  
function RaiseDetail()
  raisePoints = raisePoints + 1
  if detailLevel < 8 and raisePoints > 3 then
	--Spring.SendCommands({"echo detail is "..detailLevel..", raising"})
    Spring.SendCommands({raiseTable[detailLevel]})
    detailLevel = detailLevel + 1
	raisePoints = 0
  end
end

function LowerDetail()
  lowerPoints = lowerPoints + 1
  if detailLevel > 1 and lowerPoints > 3 then
 	--Spring.SendCommands({"echo detail is "..detailLevel..", lowering"})
    Spring.SendCommands({lowerTable[detailLevel - 1]})
	detailLevel = detailLevel - 1
	lowerPoints = 0
  end
end

function widget:Initialize()
  Spring.SendCommands({"water 0", "shadows 0", "advshading 0"})
end

function widget:Update(t)
  counter  = counter + 1
  table.insert(fpsTable, Spring.GetFPS())
  if #fpsTable > 30 then
    table.remove(fpsTable, 1)
  end
  if counter % 30 == 0 then
    counter = 0
	sum = 0
	for _, v in ipairs(fpsTable) do
	  sum = sum + v
	end
	average = sum / #fpsTable
 	--Spring.SendCommands({"echo average FPS is "..average})
	if average > maxFps then RaiseDetail() else raisePoints = 0 end
	if average < minFps then LowerDetail() else lowerPoints = 0 end
  end
end