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30 lines
702 B
CoffeeScript
30 lines
702 B
CoffeeScript
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Dropper = class Dropper
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lost_frames: 0.0
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drop_counter: 0
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constructor: ->
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@listener = (e) => @tick(e)
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tick: ->
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unless @tickedOnce
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@tickedOnce = true # Can't get measured FPS on the 0th frame
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return
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# decrement drop counter
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@drop_counter -= 1 if @drop_counter > 0
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# track number of frames we've lost since the last tick
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fps = createjs.Ticker.getFPS()
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actual = createjs.Ticker.getMeasuredFPS(1)
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@lost_frames += (fps - actual) / fps
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# if lost_frames > 1, drop that number for the next tick
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@drop_counter += parseInt(@lost_frames)
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@lost_frames = @lost_frames % 1
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drop: ->
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return @drop_counter > 0
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module.exports = new Dropper()
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