doodle/fps.go

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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
}
}