Unity-Texture2D的SetPiexl严重耗时的优化方案¶
Unity中使用Texture2D的SetPixel大量调用的时候耗时非常严重。
在使用战争迷雾时需要不断的更新迷雾数据，当进入场景时需要先初始化迷雾数据，将数据转换成纹理（
Texture2D），一张图片，使用public void SetPixel(int x, int y, Color color);时耗时非常严重。这里提供使用纹理原始数据直接修改的办法public NativeArray<T> GetRawTextureData<T>() where T : struct;，耗时优化明显提升。
使用GetRawTextureData<T>()该方法时遇到了一个问题：
- 当使用texture.GetRawTextureData<Color32>()时获取数据的长度是正常的。
- 当使用texture.GetRawTextureData<Color>()时获取数据的长度是原始长度的四分之一。
using UnityEngine;
public class ExampleScript : MonoBehaviour
{
void Start()
{
var texture = new Texture2D(128, 128, TextureFormat.RGBA32, false);
GetComponent<Renderer>().material.mainTexture = texture;
// RGBA32 texture format data layout exactly matches Color32 struct
var data = texture.GetRawTextureData<Color32>();
// fill texture data with a simple pattern
Color32 orange = new Color32(255, 165, 0, 255);
Color32 teal = new Color32(0, 128, 128, 255);
int index = 0;
for (int y = 0; y < texture.height; y++)
{
for (int x = 0; x < texture.width; x++)
{
data[index++] = ((x & y) == 0 ? orange : teal);
}
}
// upload to the GPU
texture.Apply();
}
}
测试代码：
public void Awake()
{
MapComponent.Instance.fogComponent = this;
jiesuoQueue.Clear();
if (DCFog.InstanceFog.Data == null)
{
Log.Error("FogComponent::DCFog.InstanceFog.Data=null");
return;
}
if (!CheckFog)
{
GameObject warFogObj = GameObject.Find("WarFog");//TODO TEMP
if (warFogObj != null)
{
warFogObj.SetActive(false);
}
return;
}
Debug.Log($"FOG LOADType::{LoadType}");
long starttime = DateTime.UtcNow.Ticks;
ProfilerHelper.BeginSample("FogComponent::Awake:UpdateLogicCell");
int cell = SN01GameConstCategory.FogSide;
int size = (int)(MapFactory.MAP_SIZE / cell);
//texture = new Texture2D(size, size, TextureFormat.R8,false);
texture = new Texture2D(MapFactory.MAP_SIZE, MapFactory.MAP_SIZE, TextureFormat.ARGB32, false);
//Debug.Log("FogComponent::texture size:"+MapFactory.MAP_SIZE+" texture:"+texture+" data len:"+ DCFog.InstanceFog.Data.Length);
texture.filterMode = FilterMode.Point;
texture.wrapMode = TextureWrapMode.Clamp;
texture.name = "fogtexture";
texture.anisoLevel = 0;
if(LoadType==0)
{
for (int i = 0; i < size; i++)
{
for (int j = 0; j < size; j++)
{
byte v = 0;
if (DCFog.InstanceFog.Data.Length == 0)
{
v = 1;
}
else
{
v = DCFog.InstanceFog.Data[i * size + j];
}
//if(v==1)
//{
//ProfilerHelper.BeginSample("UpdateCell");
UpdateLogicCell(i, j, v);
//ProfilerHelper.EndSample();
//}
}
}
}
else
{
var array = texture.GetRawTextureData<Color32>();
//Debug.Log($"fog::::===>>array:{array.Length},texture:({texture.width},{texture.height}),mipmap:{texture.mipmapCount},curlevel:{texture.loadedMipmapLevel}");
for (int i = 0; i < size; i++)
{
for (int j = 0; j < size; j++)
{
byte v = 0;
if (DCFog.InstanceFog.Data.Length == 0)
{
v = 1;
}
else
{
v = DCFog.InstanceFog.Data[i * size + j];
}
for (int m = 0; m < cell; m++)
{
for (int n = 0; n < cell; n++)
{
array[(i * cell + m) + (j * cell + n) * MapFactory.MAP_SIZE] = v !=0 ? closeCol : openCol;
}
}
}
}
}
//ProfilerHelper.EndSample();
//ProfilerHelper.BeginSample("Apply");
texture.Apply();
ProfilerHelper.EndSample();
Debug.LogError((DateTime.UtcNow.Ticks - starttime)/10000);
#if UNITY_EDITOR
float time = Time.realtimeSinceStartup;
ProfilerHelper.BeginSample("FogComponent::Awake:WritePNG");
Debug.LogError(System.IO.Path.Combine(Environment.CurrentDirectory, "fog.png"));
System.IO.File.WriteAllBytes(System.IO.Path.Combine(Environment.CurrentDirectory, "fog.png"), texture.EncodeToPNG());
ProfilerHelper.EndSample();
Log.Error("EDITOR FogComponent::Awake:WritePNG Time: " + (Time.realtimeSinceStartup - time));
#endif
FogBlur fogBlur = Camera.main.GetComponent<FogBlur>();
if(fogBlur!=null)
{
//ProfilerHelper.BeginSample("FogComponent::ComputeShaderBlur");
fogBlur.Source = texture;
fogBlur.ComputeShaderBlurTextureOfFog(texture, Camera.main.GetComponent<FogBlur>().PrintTexture);
//ProfilerHelper.EndSample();
}
else
{
Debug.LogWarning("have no fogBlur");
}
//List<int> ls = new List<int>();
//ls.Add(1024*4+500);
//ls.Add(1024 * 9 + 500);
//ls.Add(1024 * 9 + 501);
//ls.Add(1024 * 10 + 500);
//ls.Add(1024 * 10 + 501);
//UnlockFog(ls, 0);
//List<int> ls = new List<int> { 270, 150, 30};
//TimerEventComponent.Instance.CreateEvent(() => UnLockItemFogArea(ls), 1000 * 5);
}
private void UpdateLogicCell(int i,int j,int v)
{
// ProfilerHelper.BeginSample("UpdateLogicCell Inner");
// ProfilerHelper.BeginSample("UpdateLogicCell new color");
int cell = SN01GameConstCategory.FogSide;
Color color = new Color();
//ProfilerHelper.EndSample();
//Debug.Log($"FogComponent:::UpdateLogicCell:{i }-{j } cell:{cell} value:{1-v}");
//ProfilerHelper.BeginSample("UpdateLogicCell loop");
for (int m = 0; m < cell; m++)
{
for (int n = 0; n < cell; n++)
{
//if(v==1||v==0)
{
//ProfilerHelper.BeginSample("UpdateLogicCell color set");
//v = 1-v; //TODO HardReset
color.r = v;
color.g = v;
color.b = 0;
color.a = 1;
//ProfilerHelper.EndSample();
//Debug.Log($"FogComponent:::UpdateLogicCell:{i * cell + m}-{j * cell + n} value:{v}");
//ProfilerHelper.BeginSample("SetPixel");
texture.SetPixel(i * cell + m, j * cell + n, color);
//ProfilerHelper.EndSample();
}
}
}
//ProfilerHelper.EndSample();
//ProfilerHelper.EndSample();
}