Unity 给手游用的高性能辉光(Bloom) Shader

 某天项目中美术大哥们提出使用Bloom的需求。但是直接使用Unity 的PostProcess Bloom性能消耗又很大。
所以开发了一个简单的Bloom效果，能满足基本需求，又能兼顾性能。**使用方法：**场景中摄像机挂上C# 脚本。然后用此Shader 创建材质球，放在C# 脚本GO上。
**注意：**因为用的OnRenderImage，这个只在Game 窗口有效果。

Shader代码：

Shader "Hidden/CustomBloom"
{CGINCLUDE#include "UnityCG.cginc"sampler2D _MainTex;float4 _MainTex_TexelSize;float _Threshold;sampler2D _BloomTex;float _Intensity;float3 ApplyBloomThreshold (float3 color)
{float br = max(max(color.r, color.g), color.b);br = max(0.0f, (br - _Threshold)) / max(br,0.00001f);color.rgb *= br;return color;
}//阈值half4 frag_PreFilter(v2f_img i) : SV_Target{float3 color = 0;float weightSum = 0.0;float2 offsets[] = {float2(0.0, 0.0),float2(-1.0, -1.0), float2(-1.0, 1.0), float2(1.0, -1.0), float2(1.0, 1.0)};for (int j = 0; j < 5; j++){float3 c = tex2D(_MainTex, i.uv + _MainTex_TexelSize.xy * offsets[j]);c = ApplyBloomThreshold(c);//通过明度权重削弱图像变化时产生的闪烁float w = 1.0 / (Luminance(c) + 1.0);color += c * w;weightSum += w;}return float4(color, 1);}//降采样模糊half4 frag_DownsampleBox(v2f_img i) : SV_Target{half4 d = _MainTex_TexelSize.xyxy * half4(-1,-1,1,1);half4 s = 0;s += tex2D(_MainTex, i.uv + d.xy);s += tex2D(_MainTex, i.uv + d.zy);s += tex2D(_MainTex, i.uv + d.xw);s += tex2D(_MainTex, i.uv + d.zw);s *= 0.25;return s;}//升采样模糊half4 frag_UpsampleBox(v2f_img i) : SV_Target{half4 d = _MainTex_TexelSize.xyxy * half4(-1,-1,1,1);half4 color = 0;color += max(tex2D(_MainTex, i.uv + d.xy), 0.0001);color += max(tex2D(_MainTex, i.uv + d.zy), 0.0001);color += max(tex2D(_MainTex, i.uv + d.xw), 0.0001);color += max(tex2D(_MainTex, i.uv + d.zw), 0.0001);color *= 0.25;//return color;half4 color2 = tex2D(_BloomTex, i.uv);return color + color2;}//合并half4 frag_Combine(v2f_img i) : SV_Target{half4 d = _MainTex_TexelSize.xyxy * half4(-1,-1,1,1);half4 base_color = tex2D(_MainTex, i.uv);half4 bloom_color = tex2D(_BloomTex, i.uv);half3 final_color = base_color.rgb + bloom_color.rgb * _Intensity;return half4(final_color,1.0);}ENDCGProperties{_MainTex ("Texture", 2D) = "white" {}_BlurOffset("BlurOffset",Float) = 1 }SubShader{Cull Off ZWrite Off ZTest Always//0 阈值Pass{CGPROGRAM#pragma vertex vert_img#pragma fragment frag_PreFilterENDCG}//1 降采样模糊Pass{CGPROGRAM#pragma vertex vert_img#pragma fragment frag_DownsampleBoxENDCG}//2 升采样模糊Pass{CGPROGRAM#pragma vertex vert_img#pragma fragment frag_UpsampleBoxENDCG}//3 合并Pass{CGPROGRAM#pragma vertex vert_img#pragma fragment frag_CombineENDCG}}
}

C#代码：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;[ExecuteInEditMode()]
public class CustomBloom : MonoBehaviour {public Material material;[Range(0, 10)]public float _Intensity = 1;[Range(0, 10)]public float _Threshold = 1;void Start () {if (material == null || SystemInfo.supportsImageEffects == false|| material.shader == null || material.shader.isSupported == false){enabled = false;return;}}void OnRenderImage(RenderTexture source, RenderTexture destination){RenderTexture RT1 = RenderTexture.GetTemporary(source.width / 2, source.height / 2,0,source.format);RenderTexture RT2 = RenderTexture.GetTemporary(source.width / 4, source.height / 4, 0, source.format);RenderTexture RT3 = RenderTexture.GetTemporary(source.width / 8, source.height / 8, 0, source.format);RenderTexture RT4 = RenderTexture.GetTemporary(source.width / 16, source.height / 16, 0, source.format);RenderTexture RT5 = RenderTexture.GetTemporary(source.width / 32, source.height / 32, 0, source.format);RenderTexture RT6 = RenderTexture.GetTemporary(source.width / 64, source.height / 64, 0, source.format);RenderTexture RT5_up = RenderTexture.GetTemporary(source.width / 32, source.height / 32, 0, source.format);RenderTexture RT4_up = RenderTexture.GetTemporary(source.width / 16, source.height / 16, 0, source.format);RenderTexture RT3_up = RenderTexture.GetTemporary(source.width / 8, source.height / 8, 0, source.format);RenderTexture RT2_up = RenderTexture.GetTemporary(source.width / 4, source.height / 4, 0, source.format);RenderTexture RT1_up = RenderTexture.GetTemporary(source.width / 2, source.height / 2, 0, source.format);RenderTexture[] rt_list = new RenderTexture[] { RT1 , RT2, RT3, RT4, RT5, RT6,RT5_up,RT4_up,RT3_up,RT2_up,RT1_up};float intensity = Mathf.Exp(_Intensity / 10.0f * 0.693f) - 1.0f;material.SetFloat("_Intensity", intensity);material.SetFloat("_Threshold", _Threshold);//阈值Graphics.Blit(source, RT1, material,0);//模糊（降采样）Graphics.Blit(RT1, RT2, material, 1);Graphics.Blit(RT2, RT3, material, 1);Graphics.Blit(RT3, RT4, material, 1);Graphics.Blit(RT4, RT5, material, 1);Graphics.Blit(RT5, RT6, material, 1);//模糊（升采样）material.SetTexture("_BloomTex", RT5);Graphics.Blit(RT6, RT5_up, material, 2);material.SetTexture("_BloomTex", RT4);Graphics.Blit(RT5_up, RT4_up, material, 2);material.SetTexture("_BloomTex", RT3);Graphics.Blit(RT4_up, RT3_up, material, 2);material.SetTexture("_BloomTex", RT2);Graphics.Blit(RT3_up, RT2_up, material, 2);material.SetTexture("_BloomTex", RT1);Graphics.Blit(RT2_up, RT1_up, material, 2);//合并material.SetTexture("_BloomTex", RT1_up);Graphics.Blit(source, destination, material, 3);//releasefor (int i = 0; i < rt_list.Length; i++){RenderTexture.ReleaseTemporary(rt_list[i]);}}
}

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Unity 给手游用的高性能辉光(Bloom) Shader

Shader代码：

C#代码：

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