Unity3D如何实现动态分辨率降低渲染开销

using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.UI; public class DynamicResolutionTest : MonoBehaviour{    public Text screenText;     FrameTiming[] frameTimings = new FrameTiming[3];     public float maxResolutionWidthScale = 1.0f;    public float maxResolutionHeightScale = 1.0f;    public float minResolutionWidthScale = 0.5f;    public float minResolutionHeightScale = 0.5f;    public float scaleWidthIncrement = 0.1f;    public float scaleHeightIncrement = 0.1f;     float m_widthScale = 1.0f;    float m_heightScale = 1.0f;     // Variables for dynamic resolution algorithm that persist across frames    uint m_frameCount = 0;     const uint kNumFrameTimings = 2;     double m_gpuFrameTime;    double m_cpuFrameTime;     // Use this for initialization    void Start()    {        int rezWidth = (int)Mathf.Ceil(ScalableBufferManager.widthScaleFactor * Screen.currentResolution.width);        int rezHeight = (int)Mathf.Ceil(ScalableBufferManager.heightScaleFactor * Screen.currentResolution.height);        screenText.text = string.Format("Scale: {0:F3}x{1:F3}\nResolution: {2}x{3}\n",            m_widthScale,            m_heightScale,            rezWidth,            rezHeight);    }      private void OnGUI()    {        float oldWidthScale = m_widthScale;        float oldHeightScale = m_heightScale;         // One finger lowers the resolution        if (GUILayout.Button("--"))        {            m_heightScale = Mathf.Max(minResolutionHeightScale, m_heightScale - scaleHeightIncrement);            m_widthScale = Mathf.Max(minResolutionWidthScale, m_widthScale - scaleWidthIncrement);        }         // Two fingers raises the resolution        if (GUILayout.Button("++"))        {            m_heightScale = Mathf.Min(maxResolutionHeightScale, m_heightScale + scaleHeightIncrement);            m_widthScale = Mathf.Min(maxResolutionWidthScale, m_widthScale + scaleWidthIncrement);        }         if (m_widthScale != oldWidthScale || m_heightScale != oldHeightScale)        {            ScalableBufferManager.ResizeBuffers(m_widthScale, m_heightScale);        }    }    // Update is called once per frame    void Update()    {                DetermineResolution();        int rezWidth = (int)Mathf.Ceil(ScalableBufferManager.widthScaleFactor * Screen.currentResolution.width);        int rezHeight = (int)Mathf.Ceil(ScalableBufferManager.heightScaleFactor * Screen.currentResolution.height);        screenText.text = string.Format("Scale: {0:F3}x{1:F3}\n动态分辨率: {2}x{3}\nScaleFactor: {4:F3}x{5:F3}\nGPU: {6:F3} CPU: {7:F3}",            m_widthScale,            m_heightScale,            rezWidth,            rezHeight,            ScalableBufferManager.widthScaleFactor,            ScalableBufferManager.heightScaleFactor,            m_gpuFrameTime,            m_cpuFrameTime);    }     // Estimate the next frame time and update the resolution scale if necessary.    private void DetermineResolution()    {        ++m_frameCount;        if (m_frameCount <= kNumFrameTimings)        {            return;        }        FrameTimingManager.CaptureFrameTimings();        FrameTimingManager.GetLatestTimings(kNumFrameTimings, frameTimings);        if (frameTimings.Length < kNumFrameTimings)        {            Debug.LogFormat("Skipping frame {0}, didn't get enough frame timings.",                m_frameCount);             return;        }         m_gpuFrameTime = (double)frameTimings[0].gpuFrameTime;        m_cpuFrameTime = (double)frameTimings[0].cpuFrameTime;    }}