OnDemandRendering.effectiveRenderFrameRate

描述

渲染的当前估计速率，以每秒帧数为单位，舍入为最接近的整数。

这是估计值，可能无法实现，具体取决于应用程序。
如果 QualitySettings.vSyncCount 大于 0，则其计算方式为

FPS = Resolution.refreshRate / QualitySettings.vSyncCount / OnDemandRendering.renderFrameInterval

如果 QualitySettings.vSyncCount 为 0 并且 Application.targetFrameRate 也大于 0：

FPS = Application.targetFrameRate / OnDemandRendering.renderFrameInterval

未指定任何其他值时，Android、iOS 和 tvOS 使用 30 FPS 作为默认帧率。在这种情况下，返回 30/OnDemandRendering.renderFrameInterval。所有其他平台返回 Application.targetFrameRate 的值。

using UnityEngine;
using UnityEngine.Rendering;
using System.Collections;

// This example shows how to use effectiveRenderFrameRate to ensure your application renders at a given frame rate regardless of
// settings that could be changed by the user. Also demonstrates use of setting renderFrameInterval from a coroutine.
public class Example : MonoBehaviour
{
    void Start()
    {
        const int myTargetFrameRate = 10;

        // Start off assuming that Application.targetFrameRate is 60 and QualitySettings.vSyncCount is 0
        OnDemandRendering.renderFrameInterval = 6;

        // Some applications may allow the user to modify the quality level. So we may not be able to rely on
        // the framerate always being a specific value. For this example we want the effective framerate to be 10.
        // If it is not then check the values and adjust the frame interval accordingly to achieve the framerate that we desire.
        if (OnDemandRendering.effectiveRenderFrameRate != 10)
        {
            if (QualitySettings.vSyncCount > 0)
            {
                OnDemandRendering.renderFrameInterval = (Screen.currentResolution.refreshRate / QualitySettings.vSyncCount / myTargetFrameRate);
            }
            else
            {
                OnDemandRendering.renderFrameInterval = (Application.targetFrameRate / myTargetFrameRate);
            }
        }

        StartCoroutine(SlowRenderingFor5Seconds());
    }

    IEnumerator SlowRenderingFor5Seconds()
    {
        // After 5 seconds go back to rendering every frame
        yield return new WaitForSeconds(5);
        OnDemandRendering.renderFrameInterval = 1;
    }

    void Update()
    {
        // For 5 seconds this will report that the effective framerate is 10. Afterward it will log what the framerate is given the current
        // quality and target framerate settings.
        Debug.Log("FrameRate: " + OnDemandRendering.effectiveRenderFrameRate);
    }
}