[URP]交互水Shader（未完ing）

未完ing）"/>

[URP]交互水Shader（未完ing）

环境

下面代码的运行环境

• Unity : 2022.3.3f1
• Pipeline : URP

美术思路：获取屏幕中得一张RT图，传给Shader生成高度图，至于水的效果就按照正常流程去写，顶点起伏+水面反射（海水的话得加湍流）+ 泡沫 + 水边缘处理；目前水Shader还没写完后面有空再接着写；

代码如下，有注释（参考了很多文章，后面再优化效果和代码）：

Shader "Ripples/Add" {Properties {}SubShader {Tags { "RenderType"="Opaque" "RenderPipeline"="UniversalRenderPipeline" }HLSLINCLUDE#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"ENDHLSLPass {Name "Add"Tags { "LightMode"="UniversalForward" }HLSLPROGRAM#pragma vertex vert#pragma fragment fragstruct a2v {float4 positionOS   : POSITION;float2 uv           : TEXCOORD0;};struct v2f {float4 positionCS  : SV_POSITION;float2 uv           : TEXCOORD0;};TEXTURE2D(_InteractiveTex);SAMPLER(sampler_InteractiveTex);TEXTURE2D(_CurrentRT);SAMPLER(sampler_CurrentRT);float _isRenderMousePointer;float4 _PositionPoint;v2f vert(a2v v) {v2f o;o.positionCS = TransformObjectToHClip(v.positionOS.xyz);o.uv = v.uv;return o;}half4 frag(v2f i) : SV_Target {float c =  SAMPLE_TEXTURE2D(_InteractiveTex, sampler_InteractiveTex, i.uv).r + //交互相机RTSAMPLE_TEXTURE2D(_CurrentRT, sampler_CurrentRT,i.uv).r +  //上一帧RTmax(_PositionPoint.z - length(i.uv - _PositionPoint.xy)/_PositionPoint.z,0) * _isRenderMousePointer; //鼠标交互//float c = SAMPLE_TEXTURE2D(_CurrentRT, sampler_CurrentRT,i.uv).r +  //上一帧RT//		  max(_PositionPoint.z - length(i.uv - _PositionPoint.xy)/_PositionPoint.z,0) * _isRenderMousePointer; //鼠标交互return c;//return length(i.uv - _PositionPoint.xy);//return max(_PositionPoint.z - length(i.uv - _PositionPoint.xy),0);//return max(_PositionPoint.z - length(i.uv - _PositionPoint.xy)/_PositionPoint.z,0);//return  SAMPLE_TEXTURE2D(_CurrentRT, sampler_CurrentRT,i.uv).r + max(_PositionPoint.z - length(i.uv - _PositionPoint.xy)/_PositionPoint.z,0);}ENDHLSL}}
}

Shader "Ripples/RippleShader"
{Properties {_Attenuation("Attenuation" , Range(0,1)) = 0.99}SubShader {Tags { "RenderType"="Opaque" "RenderPipeline"="UniversalRenderPipeline" }HLSLINCLUDE#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"//      CBUFFER_START(UnityPerMaterial)//float _Attenuation;//      CBUFFER_ENDENDHLSLPass {Name "Ripple"Tags { "LightMode"="UniversalForward" }HLSLPROGRAM#pragma vertex vert#pragma fragment fragstruct a2v {float4 positionOS   : POSITION;float2 uv           : TEXCOORD0;};struct v2f {float4 positionCS  : SV_POSITION;float2 uv           : TEXCOORD0;};TEXTURE2D(_PrevRT);SAMPLER(sampler_PrevRT);TEXTURE2D(_CurrentRT);SAMPLER(sampler_CurrentRT);float4 _CurrentRT_TexelSize;float _Attenuation;v2f vert(a2v v) {v2f o;o.positionCS = TransformObjectToHClip(v.positionOS.xyz);o.uv = v.uv;return o;}half4 frag(v2f i) : SV_Target {//最小偏移单位float3 e = float3(_CurrentRT_TexelSize.xy,0);float2 uv =i.uv;//获取上下左右四个值float p10 = SAMPLE_TEXTURE2D(_CurrentRT, sampler_CurrentRT, uv - e.zy).x;//下float p01 = SAMPLE_TEXTURE2D(_CurrentRT, sampler_CurrentRT, uv - e.xz).x;//左float p21 = SAMPLE_TEXTURE2D(_CurrentRT, sampler_CurrentRT, uv + e.xz).x;//右float p12 = SAMPLE_TEXTURE2D(_CurrentRT, sampler_CurrentRT, uv + e.zy).x;//上//中心值float p11 =  SAMPLE_TEXTURE2D(_PrevRT, sampler_PrevRT, uv).x;//计算结果float d = (p10 + p01 + p21 + p12) / 2 - p11;//衰减d *= _Attenuation;return d;}ENDHLSL}}
}

Shader "water0829"
{Properties{   _SourceTexture("涟漪高度图", 2D) = "white" {}_sampleDelta("高度偏移",range(0,1)) = 0.5_FresnelPower("水面菲涅尔", Range(0.1,50)) = 5_Amount("折射强度",float)=100 [Header(Turbulence)][Normal]_NormalMap("水面法线扰动",2D) = "bump"{}_NormalIntensity("扰动强度",Range(0,5)) = 1_NormalScale("扰动纹理缩放",Range(0,5)) = 1_Offset("扰动纹理偏移",Range(-1,1)) = 0_WaveXSpeed("扰动速度(X轴)",Range(0,1)) = 0.5_WaveYSpeed("扰动速度(Y轴)",Range(0,1)) = 0.5_NormalRefract("扰动折射",Range(0,1)) = 0.5[NoScaleOffset]_CubeMap ("环境", CUBE) = "white" {}[Header(WaterCol)][KeywordEnum(Col,RampTex)] DepthCol("水颜色模式(2选1)",Float) = 1_DepthMaxDistance("水深度", Float) = 1[Header(DepthCol)]_DepthGradientShallow("浅水颜色", Color) = (0.325, 0.807, 0.971, 0.725)_DepthGradientDeep("深水颜色", Color) = (0.086, 0.407, 1, 0.749)[Header(DepthRampTex)]_rampTex("水着色图",2D) = "white" {}[Header(WavShape)]_WavSpeed("波浪速率",Range(0,1))=1_WavwA("波浪 A: directionX, directionZ, _Steepness, _Wavelength", Vector) = (1, 1, 0.8, 3.0)_WavwB("波浪 B: directionX, directionZ, _Steepness, _Wavelength", Vector) = (1, 1, 0.8, 3.0)_WavwC("波浪 C: directionX, directionZ, _Steepness, _Wavelength", Vector) = (1, 1, 0.8, 3.0)_ShadowMainColor("阴影颜色", color) = (0,0,0,1)}SubShader{Tags { "Queue" = "Transparent" "RenderType" = "Transparent" "IgnoreProjector" = "True" "RenderPipeline" = "UniversalPipeline" }LOD 100Blend SrcAlpha OneMinusSrcAlphaPass{   Tags{ "LightMode"="UniversalForward" }Name "Unlit"HLSLPROGRAM// Required to compile gles 2.0 with standard srp library#pragma prefer_hlslcc gles#pragma exclude_renderers d3d11_9x#pragma vertex vert#pragma fragment frag#pragma multi_compile_fog//自定义#pragma multi_compile DEPTHCOL_COL DEPTHCOL_RAMPTEX// URP 软阴影#pragma multi_compile_fragment _ _SHADOWS_SOFT// URP 主光阴影、联机阴影、屏幕空间阴影//#pragma multi_compile _ _MAIN_LIGHT_SHADOWS _MAIN_LIGHT_SHADOWS_CASCADE _MAIN_LIGHT_SHADOWS_SCREEN#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl"#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl"#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/UnityInstancing.hlsl"#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/DeclareDepthTexture.hlsl"#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/DeclareOpaqueTexture.hlsl"#include "WaterMath.hlsl"struct Attributes{float4 positionOS       : POSITION;float2 uv               : TEXCOORD0;float4 tangentOS        : TANGENT;float3 normalOS         : NORMAL;};struct Varyings{float4 positionHCS      : SV_POSITION;float2 uv               : TEXCOORD0;float  fogCoord         : TEXCOORD1;float4 screenPosition   : TEXCOORD2;float3 positionWS       : TEXCOORD3;float3 normalWS         : TEXCOORD4;float4 tangentWS        : TANGENT;};CBUFFER_START(UnityPerMaterial)float4 _SourceTexture_TexelSize; float _sampleDelta;float _WavSpeed,_NormalIntensity,_NormalScale,_Offset,_WaveXSpeed,_WaveYSpeed,_NormalRefract;float4 _WavwA,_WavwB,_WavwC;float4 _DepthGradientShallow,_DepthGradientDeep,_ShadowMainColor;            float _DepthMaxDistance,_FresnelPower,_CubemapMip;float  _Amount;CBUFFER_ENDTEXTURE2D (_rampTex);           SAMPLER(sampler_rampTex);TEXTURE2D (_SourceTexture);     SAMPLER(sampler_SourceTexture);TEXTURECUBE(_CubeMap);          SAMPLER(sampler_CubeMap);TEXTURE2D(_NormalMap);          SAMPLER(sampler_NormalMap);SAMPLER(_CameraColorTexture);   float4 _CameraColorTexture_TexelSize;       //该向量是非本shader独有，不能放在常量缓冲区Varyings vert(Attributes v){Varyings o = (Varyings)0;//多波叠加float3 tangent = float3(0.0, 0.0, 0.0);float3 bitangent = float3(0.0, 0.0, 0.0);v.positionOS.xyz += gerstner(_WavwA, v.positionOS, tangent, bitangent, _WavSpeed);             //_WavwB,_WavwCv.positionOS.xyz += gerstner(_WavwB, v.positionOS, tangent, bitangent, _WavSpeed); v.positionOS.xyz += gerstner(_WavwC, v.positionOS, tangent, bitangent, _WavSpeed);o.normalWS = normalize(cross(bitangent, tangent)); VertexPositionInputs positionInputs = GetVertexPositionInputs(v.positionOS.xyz); o.positionWS = positionInputs.positionWS; o.positionHCS = positionInputs.positionCS; o.screenPosition = ComputeScreenPos(o.positionHCS);VertexNormalInputs normalInputs = GetVertexNormalInputs(v.normalOS, v.tangentOS);    //计算世界空间中的法线和切线o.tangentWS = half4(normalInputs.tangentWS, v.tangentOS.w * GetOddNegativeScale());      //世界空间的切线o.uv = v.uv;o.fogCoord = ComputeFogFactor(o.positionHCS.z);return o;}half4 frag(Varyings i) : SV_Target{//阴影float4 SHADOW_COORDS = TransformWorldToShadowCoord(i.positionWS.xyz);Light  lightDirectional     = GetMainLight(SHADOW_COORDS);half   shadow        = lightDirectional.shadowAttenuation;//高度图float2 Hdelta = float2(_SourceTexture_TexelSize.x*0.5, 0);float  u1     = SAMPLE_TEXTURE2D(_SourceTexture, sampler_SourceTexture, i.uv - Hdelta).r;float  u2     = SAMPLE_TEXTURE2D(_SourceTexture, sampler_SourceTexture, i.uv + Hdelta).r;float3 du     = float3(_sampleDelta, (u2 - u1), 0);float2 Vdelta = float2(0, _SourceTexture_TexelSize.y * 0.5);float  v1     = SAMPLE_TEXTURE2D(_SourceTexture, sampler_SourceTexture, i.uv - Vdelta).r;float  v2     = SAMPLE_TEXTURE2D(_SourceTexture, sampler_SourceTexture, i.uv + Vdelta).r;float3 dv     = float3(0, (v2 - v1), _sampleDelta);float3 waterNormal = cross(dv, du);//向量准备half3 L = normalize(lightDirectional.direction);half3 V = normalize(_WorldSpaceCameraPos.xyz - i.positionWS.xyz);half3 N01 = waterNormal;  half3 N02 = i.normalWS;half3 blendedNormal = lerp(N01, N02, 0.5);//---------//uv偏移float4 offsetColor = (SAMPLE_TEXTURE2D(_NormalMap,sampler_NormalMap, i.uv+ float2(_WaveXSpeed * _Time.x, 0))+ SAMPLE_TEXTURE2D(_NormalMap,sampler_NormalMap, float2(i.uv.y, i.uv.x)+ float2(_WaveYSpeed * _Time.x, 0))) / 2;half2 offset = UnpackNormal(offsetColor).xy * _NormalRefract; //法线偏移程度可控之后offset被用于这里//切线转世界half3 normalTS1 = UnpackNormal(SAMPLE_TEXTURE2D(_NormalMap,sampler_NormalMap,i.uv*_NormalScale+offset));    //对法线纹理采样（切线）half3 normalTS2 = UnpackNormal(SAMPLE_TEXTURE2D(_NormalMap,sampler_NormalMap,i.uv*_NormalScale-offset));    //对法线纹理采样（切线）half3 normalTS3 = normalize(normalTS1+normalTS2);normalTS3.xy *= _NormalIntensity;normalTS3.z = sqrt(1 - saturate(dot(normalTS3.xy, normalTS3.xy)));half3 binormalWS = cross(blendedNormal, normalTS3.xyz) * i.tangentWS.w;                          //世界空间下的副切线 half3 NormalWS = normalize(mul(normalTS3,half3x3(i.tangentWS.xyz,binormalWS,blendedNormal)));       //将切线空间中的法线转换到世界空间中//blendedNormal = lerp(blendedNormal, NormalWS, 0.5);half3 vrDirWS = reflect(-V, NormalWS);       // 反射//折射float2 SS_texcoord = i.positionHCS.xy/_ScreenParams.xy;//获取屏幕UVfloat2 SS_bias=normalTS3.xy*_Amount*_CameraColorTexture_TexelSize;//如果取的是切线空间的法线则执行它计算偏移，但是切线空间的法线不随着模型的旋转而变换；half3 refract = tex2D(_CameraColorTexture, SS_texcoord+SS_bias).rgb;//计算结果half  NdotL   = max(dot(blendedNormal, L),1e-5);half3 SampleCubeMap = SAMPLE_TEXTURECUBE_LOD(_CubeMap, sampler_CubeMap, vrDirWS,_CubemapMip).rgb;half  fresnel =  pow((1- (dot(blendedNormal,V))),_FresnelPower);half3 ref = lerp(refract,SampleCubeMap, fresnel)+pow(fresnel,100);//水的颜色float2 screenPos= i.screenPosition.xy / i.screenPosition .w;float depth = LinearEyeDepth(SampleSceneDepth(screenPos), _ZBufferParams);float depthDifference = depth - i.screenPosition.w;depthDifference = saturate(depthDifference / _DepthMaxDistance);//两个方法#if DEPTHCOL_COLfloat4 waterColor = lerp(_DepthGradientShallow, _DepthGradientDeep, depthDifference);//waterColor.a*= depthDifference;#elif DEPTHCOL_RAMPTEXdepthDifference = clamp(0,0.99,depthDifference);float3 DepthColor = SAMPLE_TEXTURE2D(_rampTex,sampler_rampTex,(depthDifference + 0.2)*4/5);float  alpha = (0,1,depthDifference);float4 waterColor = float4(DepthColor,alpha);waterColor  = float4(waterColor.rgb,alpha);#endifshadow = shadow*depthDifference;                     //阴影矫正边缘过硬waterColor.rgb = MixFog(waterColor.rgb, i.fogCoord);waterColor.rgb = lerp(_ShadowMainColor.rgb * waterColor.rgb, waterColor.rgb, shadow);waterColor.rgb += ref;half4 Debug = float4(vrDirWS,1);return waterColor;}ENDHLSL}}
}

水还没写完，后面有空再写，后面有空再写~