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Viewing changes to zoetrope/debug/performance.lua

  • Committer: Josh C
  • Date: 2013-08-24 21:15:46 UTC
  • Revision ID: josh@9ix.org-20130824211546-713om9pp99jgd6of
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zoetrope/debug/performance.lua
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DebugPerformance = DebugInstrument:extend
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{
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        width = 'narrow',
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        contentHeight = 30,
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        samples = {},
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        sampleInterval = 0.25,
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        samplePtr = 1,
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        numSamples = 100,
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        _sampleTimer = 0,
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        average = '-',
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        onNew = function (self)
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                self.bars = self:add(Group:new())
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        end,
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        onUpdate = function (self, elapsed)
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                self._sampleTimer = self._sampleTimer + elapsed
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                local fps = math.floor(1 / elapsed + 0.5)
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                self.title.text = 'FPS (' .. fps .. ', average ' .. self.average .. ')'
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                if self._sampleTimer > self.sampleInterval then
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                        -- record fps and percent of desired fps
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                        table.insert(self.samples, fps)
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                        table.insert(self.samples, fps / the.app.fps)
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                        if #self.samples > self.numSamples * 2 then
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                                table.remove(self.samples, 1)
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                                table.remove(self.samples, 1)
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                        end
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                        -- calculate average
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                        local sum = 0
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                        for i = 1, #self.samples, 2 do
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                                sum = sum + self.samples[i]
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                        end
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                        self.average = math.floor(sum / #self.samples * 2 + 0.5)
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                        -- sync bars and title bar
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                        local barHeight = self.contentHeight - 2 * self.spacing
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                        for i, bar in ipairs(self._sampleBars) do
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                                local percent = self.samples[i * 2]
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                                if percent then
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                                        bar.distort.y = percent
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                                        if percent > 0.5 then
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                                                -- blend yellow to green
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                                                bar.fill = {255 * (1 - (percent / 2)), 255, 0}
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                                        else
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                                                -- blend red to yellow
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                                                -- 510 * percent = 255 * percent / 2
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                                                bar.fill = {255, 510 * percent, 0}
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                                        end
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                                else
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                                        bar.distort.y = 0
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                                end
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                        end
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                        self._sampleTimer = 0
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                end
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        end,
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        onResize = function (self, x, y, width, height)
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                local oldSamples = self.numSamples
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                self.y = y + self.spacing 
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                x = x + self.spacing
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                self.numSamples = math.floor(width - 2 * self.spacing) / 2
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                if self.numSamples ~= oldSamples then
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                        self._sampleBars = {}
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                        while #self.bars.sprites > 0 do
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                                self.bars:remove(self.bars.sprites[1])
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                        end
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                        for i = 1, self.numSamples do
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                                self._sampleBars[i] = self.bars:add(Fill:new
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                                {
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                                        x = x,
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                                        y = self.y,
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                                        width = 2,
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                                        height = height - self.spacing * 2,
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                                        origin = { y = height - self.spacing * 2 },
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                                        distort = { x = 1, y = 0 },
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                                        fill = {255, 255, 255},
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                                })
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                                x = x + 2
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                        end
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                end
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        end
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}