效果
代码
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using System.Collections; using System.Collections.Generic; using UnityEngine; [ExecuteInEditMode] [ImageEffectAllowedInSceneView] public class Bloom : MonoBehaviour { #region constData const int firstPass = 0; const int downPass = 1; const int upPass = 2; const int mixPass = 3; #endregion public Shader bloom; private Material material; [Range(0,8)] public int Interations; [Range(1,10)]// 已经限定从1开始， 只有开启HDR的才会开启bloom public float Threshold =1; [Range(0,1)] public float SoftThreshold = 0.5f; [Range(0,10)] public float Intensity = 1; RenderTexture[] textures = new RenderTexture[8]; private void OnRenderImage(RenderTexture source, RenderTexture destination) { if (!material) { material = new Material(bloom); material.hideFlags = HideFlags.HideAndDontSave; } material.SetFloat("_Threshold", Threshold); material.SetFloat("_Intensity", Intensity); float knee = Threshold - SoftThreshold; Vector4 filter; filter.x = Threshold; filter.y = Threshold - knee; filter.z = 2 * knee; filter.w = 4 * knee + 0.00001f; // 将参数，以V4的形式传递进shader,将计算量留在CPU,减少GPU的计算 material.SetVector("_Filter", filter); int width = source.width; int height = source.height; width /= 2; height /= 2; RenderTextureFormat format = source.format; RenderTexture currentDestination = textures[0] = RenderTexture.GetTemporary(width, height, 0, format); Graphics.Blit(source, currentDestination,material,firstPass); RenderTexture currentSource = currentDestination; int i = 1; // 向下采样 for (; i < Interations; i++) { width /= 2; height /= 2; if (height<2) { break; } currentDestination = textures[i] = RenderTexture.GetTemporary(width, height, 0, format); Graphics.Blit(currentSource, currentDestination,material,downPass); currentSource = currentDestination; } //向上采样 for (i-=2; i>=0; i--) { currentDestination = textures[i]; textures[i] = null; Graphics.Blit(currentSource, currentDestination,material,upPass); RenderTexture.ReleaseTemporary(currentSource); currentSource = currentDestination; } material.SetTexture("_SourceTex", source); //混合 Graphics.Blit(currentDestination, destination,material,mixPass); RenderTexture.ReleaseTemporary(currentDestination); } } |
Shader
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Shader "custom/Bloom" { Properties { _MainTex ("Texture", 2D) = "white" {} //_SourceTex("SourceTex",2D) = "white"{} //_Threshold("_Threshold",float) = 1 //_Filter("_Filter",Vector) = (0,0,0,0) } CGINCLUDE #include "UnityCG.cginc" float _Threshold; struct appdata { float4 vertex : POSITION; float2 uv : TEXCOORD0; }; struct v2f { float2 uv : TEXCOORD0; float4 vertex : SV_POSITION; }; v2f vert (appdata v) { v2f o; o.vertex = UnityObjectToClipPos(v.vertex); o.uv = v.uv; return o; } sampler2D _MainTex; float4 _MainTex_TexelSize; sampler2D _SourceTex; float4 _SourceTex_ST; vector _Filter; float _Intensity; half3 Sample(float2 uv) { return tex2D(_MainTex,uv).rgb; } // half3 SampleBox(float2 uv,float detail) { float4 o = _MainTex_TexelSize.xyxy * float4(-detail,-detail,detail,detail); half3 c = Sample(uv+ o.xy) + Sample(uv + o.xz) + Sample(uv+o.zw) +Sample(uv+o.zx); return c*0.25; } // half3 Prefilter(half3 c) // { // half brightness = max(c.r,max(c.g,c.b)); // half contribution = max(0,brightness - _Threshold); // contribution /= max(brightness,0.00001); // return contribution; // } half3 Prefilter(half3 c) { half brightness = max(c.r,max(c.g,c.b)); half soft = brightness - _Filter.y; soft = clamp(soft,0,_Filter.z); soft = soft * soft/_Filter.w; half contribution = max(soft,brightness- _Filter.x); contribution /= max(brightness,0.00001); return contribution*c; } ENDCG SubShader { // No culling or depth Cull Off ZWrite Off ZTest Always Pass { //像素的预筛选 CGPROGRAM #pragma vertex vert #pragma fragment frag fixed4 frag (v2f i) : SV_Target { half3 col = Prefilter(SampleBox(i.uv,1)); return fixed4(col,1); } ENDCG } Pass { //下采样 CGPROGRAM #pragma vertex vert #pragma fragment frag fixed4 frag (v2f i) : SV_Target { half3 col = SampleBox(i.uv,1); return fixed4(col,1); } ENDCG } Pass { Blend One One // 上采样 CGPROGRAM #pragma vertex vert #pragma fragment frag fixed4 frag (v2f i) : SV_Target { half3 col = SampleBox(i.uv,0.5); return fixed4(col,1); } ENDCG } Pass { //混合 CGPROGRAM #pragma vertex vert #pragma fragment frag fixed4 frag (v2f i) : SV_Target { half3 col = SampleBox(i.uv,0.5) + tex2D(_SourceTex,i.uv).rgb * _Intensity; //half3 col = SampleBox(i.uv,1); return fixed4(col,1); } ENDCG } } } |
使用方法
将脚本挂载到相机上，然后将拖入shader
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