145 lines
6.5 KiB
C#
145 lines
6.5 KiB
C#
using UnityEngine;
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//设置在编辑模式下也执行该脚本
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//[ExecuteInEditMode]
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//添加选项到菜单中
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[AddComponentMenu("RapidBlurEffect")]
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public class RapidBlurEffectUtlis : MonoBehaviour
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{
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static class Uniforms
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{
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internal static readonly int _DownSampleValue = Shader.PropertyToID("_DownSampleValue");
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}
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//-------------------变量声明部分-------------------
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#region Variables
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//指定Shader名称
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private string ShaderName = "Learning Unity Shader/Lecture 15/RapidBlurEffect";
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public Shader CurShader;
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//着色器和材质实例
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private Material CurMaterial;
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//降采样次数
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[Range(0, 6), Tooltip("[降采样次数]向下采样的次数。此值越大,则采样间隔越大,需要处理的像素点越少,运行速度越快。")]
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public int DownSampleNum = 2;
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//模糊扩散度
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[Range(0.0f, 20.0f), Tooltip("[模糊扩散度]进行高斯模糊时，相邻像素点的间隔。此值越大相邻像素间隔越远，图像越模糊。但过大的值会导致失真。")]
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public float BlurSpreadSize = 2.0f;
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//迭代次数
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[Range(0, 8), Tooltip("[迭代次数]此值越大,则模糊操作的迭代次数越多，模糊效果越好，但消耗越大。")]
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public int BlurIterations = 2;
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#endregion
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public void SetShader(Shader s)
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{
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CurShader = s;
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}
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Material material
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{
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get
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{
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if (CurMaterial == null && CurShader != null)
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{
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CurMaterial = new Material(CurShader);
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CurMaterial.hideFlags = HideFlags.HideAndDontSave;
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}
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return CurMaterial;
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}
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}
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#region Functions
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//-----------------------------------------【Start()函数】---------------------------------------------
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// 说明：此函数仅在Update函数第一次被调用前被调用
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//--------------------------------------------------------------------------------------------------------
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void Start()
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{
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//判断当前设备是否支持屏幕特效
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if (!SystemInfo.supportsImageEffects)
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{
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enabled = false;
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return;
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}
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}
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//-------------------------------------【OnRenderImage()函数】------------------------------------
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// 说明：此函数在当完成所有渲染图片后被调用，用来渲染图片后期效果
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//--------------------------------------------------------------------------------------------------------
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void OnRenderImage(RenderTexture sourceTexture, RenderTexture destTexture)
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{
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//着色器实例不为空，就进行参数设置
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if (material != null)
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{
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//【0】参数准备
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//根据向下采样的次数确定宽度系数。用于控制降采样后相邻像素的间隔
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float widthMod = 1.0f / (1.0f * (1 << DownSampleNum));
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//Shader的降采样参数赋值
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//material.SetFloat("_DownSampleValue", BlurSpreadSize * widthMod);
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material.SetFloat(Uniforms._DownSampleValue, BlurSpreadSize * widthMod);
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//设置渲染模式：双线性
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sourceTexture.filterMode = FilterMode.Bilinear;
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//通过右移，准备长、宽参数值
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int renderWidth = sourceTexture.width >> DownSampleNum;
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int renderHeight = sourceTexture.height >> DownSampleNum;
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// 【1】处理Shader的通道0，用于降采样 ||Pass 0,for down sample
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//准备一个缓存renderBuffer，用于准备存放最终数据
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RenderTexture renderBuffer = RenderTexture.GetTemporary(renderWidth, renderHeight, 0, sourceTexture.format);
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//设置渲染模式：双线性
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renderBuffer.filterMode = FilterMode.Bilinear;
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//拷贝sourceTexture中的渲染数据到renderBuffer,并仅绘制指定的pass0的纹理数据
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Graphics.Blit(sourceTexture, renderBuffer, material, 0);
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//【2】根据BlurIterations（迭代次数），来进行指定次数的迭代操作
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for (int i = 0; i < BlurIterations; i++)
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{
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//【2.1】Shader参数赋值
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//迭代偏移量参数
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float iterationOffs = (i * 1.0f);
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//Shader的降采样参数赋值
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//material.SetFloat("_DownSampleValue", BlurSpreadSize * widthMod + iterationOffs);
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material.SetFloat(Uniforms._DownSampleValue, BlurSpreadSize * widthMod + iterationOffs);
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// 【2.2】处理Shader的通道1，垂直方向模糊处理 || Pass1,for vertical blur
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// 定义一个临时渲染的缓存tempBuffer
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RenderTexture tempBuffer = RenderTexture.GetTemporary(renderWidth, renderHeight, 0, sourceTexture.format);
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// 拷贝renderBuffer中的渲染数据到tempBuffer,并仅绘制指定的pass1的纹理数据
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Graphics.Blit(renderBuffer, tempBuffer, material, 1);
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// 清空renderBuffer
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RenderTexture.ReleaseTemporary(renderBuffer);
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// 将tempBuffer赋给renderBuffer，此时renderBuffer里面pass0和pass1的数据已经准备好
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renderBuffer = tempBuffer;
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// 【2.3】处理Shader的通道2，竖直方向模糊处理 || Pass2,for horizontal blur
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// 获取临时渲染纹理
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tempBuffer = RenderTexture.GetTemporary(renderWidth, renderHeight, 0, sourceTexture.format);
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// 拷贝renderBuffer中的渲染数据到tempBuffer,并仅绘制指定的pass2的纹理数据
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Graphics.Blit(renderBuffer, tempBuffer, material, 2);
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//【2.4】得到pass0、pass1和pass2的数据都已经准备好的renderBuffer
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// 再次清空renderBuffer
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RenderTexture.ReleaseTemporary(renderBuffer);
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// 再次将tempBuffer赋给renderBuffer，此时renderBuffer里面pass0、pass1和pass2的数据都已经准备好
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renderBuffer = tempBuffer;
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}
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//拷贝最终的renderBuffer到目标纹理，并绘制所有通道的纹理到屏幕
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Graphics.Blit(renderBuffer, destTexture);
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//清空renderBuffer
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RenderTexture.ReleaseTemporary(renderBuffer);
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}
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//着色器实例为空，直接拷贝屏幕上的效果。此情况下是没有实现屏幕特效的
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else
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{
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//直接拷贝源纹理到目标渲染纹理
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Graphics.Blit(sourceTexture, destTexture);
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}
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}
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#endregion
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} |