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unity-shader-example-depthDecal

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buildin效果图

urp效果图

DepthDecal.shader

DepthDecal.shader
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Shader "HHF/Example/DepthDecal"
{
    Properties
    {
        _BaseColor("Base Color",color) = (1,1,1,1)
        _BaseMap("BaseMap", 2D) = "white" {}
    }

    SubShader
    {
        Tags { "Queue"="Transparent" "RenderType" = "Transparent" "IgnoreProjector" = "True" "RenderPipeline" = "UniversalPipeline" }

        Pass
        {
            Blend One One

            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
            #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"

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

            struct v2f
            {
                float4 positionCS : SV_POSITION;
                float2 uv : TEXCOORD0;
                float3 positionVS : TEXCOORD1;
            };

            CBUFFER_START(UnityPerMaterial)
            half4 _BaseColor;
            float4 _BaseMap_ST;
            CBUFFER_END
            TEXTURE2D (_BaseMap);SAMPLER(sampler_BaseMap);
            TEXTURE2D(_CameraDepthTexture);SAMPLER(sampler_CameraDepthTexture);
            SAMPLER(smp);

            v2f vert(appdata v)
            {
                v2f o = (v2f)0;

                o.positionCS = TransformObjectToHClip(v.vertex.xyz);
                o.uv = TRANSFORM_TEX(v.uv, _BaseMap);
                o.positionVS = TransformWorldToView(TransformObjectToWorld(v.vertex.xyz));

                return o;
            }

            half4 frag(v2f i) : SV_Target
            {
                half4 c = 0;

                // 深度计算
                float2 screenUV = i.positionCS.xy / _ScreenParams.xy;
                half4 depthMap = SAMPLE_TEXTURE2D(_CameraDepthTexture, sampler_CameraDepthTexture, screenUV);
                half depthZ = LinearEyeDepth(depthMap.r, _ZBufferParams);

                // 计算深度图上的像素在观察空间下的坐标
                float4 depthVS = 1;
                depthVS.xy = i.positionVS.xy * depthZ / -i.positionVS.z;
                depthVS.z = depthZ;
                // 计算深度图上的像素在世界空间下的坐标
                float3 depthWS = mul(unity_CameraToWorld, depthVS).xyz;
                // 计算深度图上的像素在本地空间下的坐标
                float3 depthOS = mul(unity_WorldToObject, float4(depthWS, 1)).xyz;

                // 采样主纹理
                // depthOS.xy 不是固定的，看模型决定，这里用的是unity自带的 quad
                float2 uv = depthOS.xy + 0.5;
                half4 baseMap = SAMPLE_TEXTURE2D(_BaseMap, sampler_BaseMap, saturate(uv));
                c = baseMap * _BaseColor;

                return c;
            }
            ENDHLSL
        }
    }

    SubShader
    {
        Tags { "Queue"="Transparent" "RenderType" = "Transparent" "IgnoreProjector" = "True" }

        Pass
        {
            Blend One One

            CGPROGRAM
            
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

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

            struct v2f
            {
                float4 positionCS : SV_POSITION;
                float2 uv : TEXCOORD0;
                float3 positionVS : TEXCOORD1;
            };

            half4 _BaseColor;
            sampler2D _BaseMap; float4 _BaseMap_ST;
            sampler2D _CameraDepthTexture;

            v2f vert(appdata v)
            {
                v2f o = (v2f)0;

                o.positionCS = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _BaseMap);
                o.positionVS = mul(UNITY_MATRIX_MV, float4(v.vertex.xyz, 1));

                return o;
            }

            half4 frag(v2f i) : SV_Target
            {
                half4 c = 0;

                // 深度计算
                float2 screenUV = i.positionCS.xy / _ScreenParams.xy;
                half4 depthMap = tex2D(_CameraDepthTexture, screenUV);
                half depthZ = LinearEyeDepth(depthMap.r);

                // 计算深度图上的像素在观察空间下的坐标
                float4 depthVS = 1;
                depthVS.xy = i.positionVS.xy * depthZ / -i.positionVS.z;
                depthVS.z = depthZ;
                // 计算深度图上的像素在世界空间下的坐标
                float3 depthWS = mul(unity_CameraToWorld, depthVS);
                // 计算深度图上的像素在本地空间下的坐标
                float3 depthOS = mul(unity_WorldToObject, float4(depthWS, 1));

                // 采样主纹理
                // depthOS.xy 不是固定的，看模型决定，这里用的是unity自带的 quad
                float2 uv = depthOS.xy + 0.5;
                half4 baseMap = tex2D(_BaseMap, uv);
                c = baseMap * _BaseColor;

                return c;
            }
            ENDCG
        }
    }
}