【Unity Shader】Builtin升级URP学习笔记（一）

johnsoncodehk · 发表于 2021-11-22 10:42

一、URP Shader模板

Shader &#34;URP/URPShader&#34;
{
Properties
{
      _Color (&#34;Color&#34;, Color)=(1,1,1,1)
      _MainTex (&#34;Texture&#34;, 2D) = &#34;white&#34; {}
}
SubShader
{
      Tags { &#34;RenderPipeline&#34;=&#34;UniversalPipeline&#34; &#34;RenderType&#34;=&#34;Opaque&#34; }
      LOD 100

      Pass
      {
         Tags{&#34;LightMode&#34;=&#34;UniversalForward&#34;}
         HLSLPROGRAM
         #pragma vertex vert
         #pragma fragment frag
         #pragma multi_compile_fog

         #include &#34;Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl&#34;
         #include &#34;Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl&#34;

         struct appdata
         {
            float4 vertex : POSITION;
            float2 uv : TEXCOORD0;
            float3 normal : TEXCOORD1;
         };

         struct v2f
         {
            float2 uv : TEXCOORD0;
            float3 worldPos : TEXCOORD1;
            float3 worldNormal : TEXCOORD2;
            float fogCoord : TEXCOORD3;
            float4 vertex : SV_POSITION;
         };

         TEXTURE2D(_MainTex);
         SAMPLER(sampler_MainTex);

         CBUFFER_START(UnityPerMaterial)
         float4 _MainTex_ST;
         float4 _Color;
         CBUFFER_END

         v2f vert (appdata v)
         {
            v2f o;
            o.vertex = TransformObjectToHClip(v.vertex.xyz);
            o.uv = TRANSFORM_TEX(v.uv, _MainTex);
            o.worldNormal = TransformObjectToWorldDir(v.normal);
            o.worldPos = TransformObjectToWorldDir(v.vertex.xyz);
            o.fogCoord = ComputeFogFactor(o.vertex.z);
            return o;
         }

         half4 frag (v2f i) : SV_Target
         {
            Light light = GetMainLight();

            half3 worldNormal = normalize(i.worldNormal);
            half3 worldLightDir=normalize(TransformObjectToWorldDir(light.direction));

            half4 col = SAMPLE_TEXTURE2D(_MainTex,sampler_MainTex,i.uv)*_Color;

            half3 diffuse = LightingLambert(light.color.rgb, worldLightDir, worldNormal);
            half3 ambient = _GlossyEnvironmentColor.rgb;

            col.rgb=col.rgb*diffuse+ambient;

            col.rgb = MixFog(col.rgb,i.fogCoord);
            return col;
         }
         ENDHLSL
      }
}
FallBack &#34;Packages/com.unity.render-pipelines.universal/FallbackError&#34;
}其它可参考这个大佬的文章，其中包含了各种URP Shader的编写方式：
二、URP升级指南

详情可参考：
三、补充

接收阴影：
float4 SHADOW_COORDS = TransformWorldToShadowCoord(i.worldPos);
Light mainLight = GetMainLight(SHADOW_COORDS);
half shadow = mainLight.shadowAttenuation;要使上面生效，必须声明
#pragma multi_compile _ _MAIN_LIGHT_SHADOWS
#pragma multi_compile _ _MAIN_LIGHT_SHADOWS_CASCADE
#pragma multi_compile _ _SHADOWS_SOFT投射阴影：
URP自带的ShadowCaster：
UsePass &#34;Universal Render Pipeline/Lit/ShadowCaster&#34;经常会打断batcher，需要自己重定义。
获取深度图：
内置管线中
//声明深度图
sampler2D  _CameraDepthTexture;

//获取屏幕坐标
o.scrPos = ComputeScreenPos(o.vertex);

//采样深度图
float depth = UNITY_SAMPLE_DEPTH(tex2Dproj(_CameraDepthTexture, UNITY_PROJ_COORD(i.scrPos)));
float depthValue = Linear01Depth(depth);URP中
//声明深度图
TEXTURE2D_X_FLOAT(_CameraDepthTexture);
SAMPLER(sampler_CameraDepthTexture);

//获取屏幕坐标
o.scrPos = ComputeScreenPos(vertexInput.positionCS);

//采样深度图
float2 screenPos= v.scrPos .xy / v.scrPos .w;
float depth = SAMPLE_TEXTURE2D_X(_CameraDepthTexture, sampler_CameraDepthTexture, screenPos).r;
float depthValue = Linear01Depth(depth, _ZBufferParams);

		自动登录	找回密码
密码			立即注册