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Add Framerate Counter (capped at 60)

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Jahnisse
2026-06-03 16:10:28 +02:00
parent 3c8e9080f3
commit c95a59c771
3 changed files with 352 additions and 0 deletions
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Assets/_Content/Scenes/TitleScreen.unity
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Assets/_Content/Scripts/Core/Utils/PerformanceOverlay.cs
+117
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using UnityEngine;
using UnityEngine.UI;
using System.Collections.Generic;
/// <summary>
/// PerformanceOverlay — displays FPS, frame time, and estimated input lag.
/// Singleton: only one instance will ever exist. Safe to place in every scene —
/// duplicates are destroyed automatically. Persists across scene loads.
/// Requires: a Canvas with a Text (or TMP_Text) component assigned in the Inspector.
/// </summary>
public class PerformanceOverlay : MonoBehaviour
{
// ── singleton ────────────────────────────────────────────────────────────
public static PerformanceOverlay Instance { get; private set; }
void Awake()
{
if (Instance != null && Instance != this)
{
// A valid instance already exists — destroy this duplicate.
Destroy(gameObject);
return;
}
Instance = this;
DontDestroyOnLoad(gameObject);
}
[Header("UI Reference")]
[Tooltip("Assign a UI Text or TextMeshPro Text component here.")]
public Text displayText; // swap to TMP_Text if using TextMeshPro
[Header("FPS Settings")]
[Tooltip("How many frames to average over for a smooth FPS reading.")]
public int sampleSize = 60;
[Tooltip("How often (seconds) the display refreshes.")]
public float updateInterval = 0.1f;
[Header("Input Lag Settings")]
[Tooltip("Frames of render pipeline latency added on top of frame time.\n" +
"Typical values: 0–1 for Forward, 1–2 for Deferred / URP with buffering.")]
public int pipelineLatencyFrames = 1;
[Header("Thresholds (for colour coding)")]
public int goodFPS = 60;
public int warningFPS = 30;
// ── internals ────────────────────────────────────────────────────────────
private readonly Queue<float> _frameTimes = new Queue<float>();
private float _accumulatedTime;
private float _timeSinceLastUpdate;
// Colour tags (works with both Text and TMP richtext)
private const string GREEN = "<color=#00ff88>";
private const string YELLOW = "<color=#ffcc00>";
private const string RED = "<color=#ff4444>";
private const string END = "</color>";
// ── lifecycle ────────────────────────────────────────────────────────────
void Update()
{
float dt = Time.unscaledDeltaTime; // unscaled so pausing doesn't skew readings
// Rolling window
_frameTimes.Enqueue(dt);
_accumulatedTime += dt;
if (_frameTimes.Count > sampleSize)
_accumulatedTime -= _frameTimes.Dequeue();
_timeSinceLastUpdate += dt;
if (_timeSinceLastUpdate >= updateInterval)
{
_timeSinceLastUpdate = 0f;
RefreshDisplay();
}
}
// ── display logic ────────────────────────────────────────────────────────
void RefreshDisplay()
{
if (displayText == null) return;
// ── FPS ──────────────────────────────────────────────────────────────
float avgFrameTime = _accumulatedTime / _frameTimes.Count; // seconds
float fps = 1f / avgFrameTime;
float frameTimeMs = avgFrameTime * 1000f;
// ── Input Lag estimate ───────────────────────────────────────────────
// Input lag ≈ time from physical input to pixel on screen.
// Best estimate without hardware: frame time + pipeline latency frames.
//
// inputLag ≈ frameTime + (pipelineLatencyFrames × frameTime)
// = frameTime × (1 + pipelineLatencyFrames)
//
// Add 8 ms as a rough USB / Bluetooth HID polling floor.
float hidPollMs = 8f; // ~1 frame @ 125 Hz polling; 1 ms @ 1000 Hz
float inputLagMs = frameTimeMs * (1 + pipelineLatencyFrames) + hidPollMs;
// ── colour coding ────────────────────────────────────────────────────
string fpsColour = fps >= goodFPS ? GREEN
: fps >= warningFPS ? YELLOW
: RED;
// ── format ───────────────────────────────────────────────────────────
displayText.text =
$"{fpsColour}{fps,5:F0} FPS{END}\n" +
$"Frame {frameTimeMs,6:F2} ms\n" +
$"Lag ≈ {inputLagMs,6:F2} ms";
}
// ── public helpers ───────────────────────────────────────────────────────
/// <summary>Toggle the overlay on / off (e.g. bind to F3).</summary>
public void Toggle() => displayText.gameObject.SetActive(
!displayText.gameObject.activeSelf);
}
Assets/_Content/Scripts/Core/Utils/PerformanceOverlay.cs.meta
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