package doodle import ( "fmt" "time" "git.kirsle.net/apps/doodle/render" "github.com/veandco/go-sdl2/sdl" ) // Frames to cache for FPS calculation. const maxSamples = 100 var ( fpsCurrentTicks uint32 // current time we get sdl.GetTicks() fpsLastTime uint32 // last time we printed the fpsCurrentTicks fpsCurrent int fpsFrames int fpsSkipped uint32 fpsInterval uint32 = 1000 ) // DrawDebugOverlay draws the debug FPS text on the SDL canvas. func (d *Doodle) DrawDebugOverlay() { if !d.Debug { return } text := fmt.Sprintf( "FPS: %d (%dms) (%d,%d) size=%d F12=screenshot", fpsCurrent, fpsSkipped, d.events.CursorX.Now, d.events.CursorY.Now, len(pixelHistory), ) render.StrokedText(render.TextConfig{ Text: text, Size: DebugTextSize, Color: DebugTextColor, StrokeColor: DebugTextOutline, X: DebugTextPadding, Y: DebugTextPadding, }) } // TrackFPS shows the current FPS once per second. func (d *Doodle) TrackFPS(skipped uint32) { fpsFrames++ fpsCurrentTicks = sdl.GetTicks() // Skip the first second. if fpsCurrentTicks < fpsInterval { return } if fpsLastTime < fpsCurrentTicks-fpsInterval { log.Debug("Uptime: %s FPS: %d deltaTicks: %d skipped: %dms", time.Now().Sub(d.startTime), fpsCurrent, fpsCurrentTicks-fpsLastTime, skipped, ) fpsLastTime = fpsCurrentTicks fpsCurrent = fpsFrames fpsFrames = 0 fpsSkipped = skipped } }