71 lines
1.4 KiB
Go
71 lines
1.4 KiB
Go
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) (X,Y)=(%d,%d) canvas=%d",
|
|
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
|
|
}
|
|
}
|