[JEWEL-1137] Added FPS counter to the Jewel sample app #3302
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| // Copyright 2000-2025 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license. | ||
| package org.jetbrains.jewel.samples.standalone.components | ||
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| import androidx.compose.foundation.clickable | ||
| import androidx.compose.foundation.interaction.MutableInteractionSource | ||
| import androidx.compose.foundation.layout.Arrangement | ||
| import androidx.compose.foundation.layout.Row | ||
| import androidx.compose.runtime.Composable | ||
| import androidx.compose.runtime.LaunchedEffect | ||
| import androidx.compose.runtime.derivedStateOf | ||
| import androidx.compose.runtime.getValue | ||
| import androidx.compose.runtime.mutableIntStateOf | ||
| import androidx.compose.runtime.mutableStateOf | ||
| import androidx.compose.runtime.remember | ||
| import androidx.compose.runtime.setValue | ||
| import androidx.compose.runtime.withFrameMillis | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.graphics.Color | ||
| import androidx.compose.ui.unit.dp | ||
| import java.util.concurrent.atomic.AtomicInteger | ||
| import java.util.concurrent.atomic.AtomicLong | ||
| import kotlin.math.roundToInt | ||
| import kotlinx.coroutines.CoroutineDispatcher | ||
| import kotlinx.coroutines.Dispatchers | ||
| import kotlinx.coroutines.delay | ||
| import kotlinx.coroutines.launch | ||
| import org.jetbrains.jewel.ui.component.Text | ||
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| @Composable | ||
| internal fun FpsCounter(modifier: Modifier = Modifier, dispatcher: CoroutineDispatcher = Dispatchers.Default) { | ||
| var displayedFPS by remember { mutableIntStateOf(0) } | ||
| var fpsCountMethod by remember { mutableStateOf(FPSCountMethod.RealTime) } | ||
| var minFps by remember { mutableIntStateOf(240) } | ||
| var maxFps by remember { mutableIntStateOf(0) } | ||
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| val textContent by remember { | ||
| derivedStateOf { | ||
| when (fpsCountMethod) { | ||
| FPSCountMethod.RealTime -> { | ||
| "FPS(Realtime):$displayedFPS" | ||
| } | ||
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| FPSCountMethod.FixedInterval -> { | ||
| "FPS(last ${FPS_UPDATE_DELAY}ms):$displayedFPS" | ||
| } | ||
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| FPSCountMethod.FixedFrameCount -> { | ||
| "FPS(last ${FRAME_COUNT} frames):$displayedFPS" | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| val minMaxContent by remember { derivedStateOf { "min:$minFps, max:$maxFps" } } | ||
| val textColor by remember { derivedStateOf { displayedFPS.fpsCountColor } } | ||
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| Row(modifier = modifier, horizontalArrangement = Arrangement.spacedBy(8.dp)) { | ||
| Text( | ||
| text = textContent, | ||
| modifier = | ||
| Modifier.clickable(interactionSource = remember { MutableInteractionSource() }, indication = null) { | ||
| fpsCountMethod = | ||
| when (fpsCountMethod) { | ||
| FPSCountMethod.FixedInterval -> FPSCountMethod.FixedFrameCount | ||
| FPSCountMethod.FixedFrameCount -> FPSCountMethod.RealTime | ||
| FPSCountMethod.RealTime -> FPSCountMethod.FixedInterval | ||
| } | ||
| minFps = 240 | ||
| maxFps = 0 | ||
| }, | ||
| color = textColor, | ||
| ) | ||
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| Text( | ||
| text = minMaxContent, | ||
| modifier = | ||
| Modifier.clickable(interactionSource = remember { MutableInteractionSource() }, indication = null) { | ||
| minFps = 240 | ||
| maxFps = 0 | ||
| }, | ||
| ) | ||
| } | ||
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| LaunchedEffect(Unit) { | ||
| val fpsArray = FloatArray(FRAME_COUNT) { 0f } | ||
| val fpsCount = AtomicInteger(0) | ||
| val writeIndex = AtomicInteger(0) | ||
| val lastWriteIndex = AtomicInteger(0) | ||
| val lastUpdTime = AtomicLong(withFrameMillis { it }) | ||
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| launch(dispatcher) { | ||
| while (true) { | ||
| delay(FPS_UPDATE_DELAY) | ||
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| displayedFPS = | ||
| when (fpsCountMethod) { | ||
| FPSCountMethod.FixedInterval -> fpsCount.getAndSet(0) * 1000 / FPS_UPDATE_DELAY.toInt() | ||
| FPSCountMethod.FixedFrameCount -> fpsArray.average().roundToInt() | ||
| FPSCountMethod.RealTime -> fpsArray[lastWriteIndex.get()].roundToInt() | ||
| } | ||
| if (displayedFPS > 0) { | ||
| minFps = minOf(minFps, displayedFPS) | ||
| } | ||
| maxFps = maxOf(maxFps, displayedFPS) | ||
| } | ||
| } | ||
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| while (true) { | ||
| withFrameMillis { frameTimeMillis -> | ||
| fpsCount.getAndUpdate { it + 1 } | ||
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| fpsArray[writeIndex.get()] = 1000f / (frameTimeMillis - lastUpdTime.getAndSet(frameTimeMillis)) | ||
|
There was a problem hiding this comment. Bug: Time Collisions Cause FPS InstabilityDivision by zero: if two consecutive frames occur at the exact same millisecond timestamp, |
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| lastWriteIndex.set(writeIndex.getAndUpdate { (it + 1) % fpsArray.size }) | ||
| } | ||
| } | ||
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| } | ||
| } | ||
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| private const val FPS_UPDATE_DELAY = 250L | ||
| private const val FRAME_COUNT = 20 | ||
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| private val Int.fpsCountColor: Color | ||
| get() = | ||
| when { | ||
| this > 55 -> Color.Green | ||
| this > 45 -> Color.Yellow | ||
| else -> Color.Red | ||
| } | ||
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| internal enum class FPSCountMethod { | ||
| FixedInterval, | ||
| FixedFrameCount, | ||
| RealTime, | ||
| } | ||
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