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unity-shader-tutorial-depthMap

Posted on Edited on

buildin效果图

urp效果图

DepthMap.shader

DepthMap.shader
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Shader "HHF/Tutorial/DepthMap"
{
    SubShader
    {
        Tags { "Queue"="Transparent" "RenderType" = "Transparent" "IgnoreProjector" = "True" "RenderPipeline" = "UniversalPipeline" }
        Cull Off

        Pass
        {
            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;
            };

            struct v2f
            {
                float4 positionCS : SV_POSITION;
                float4 positionSS : TEXCOORD0;
            };

            CBUFFER_START(UnityPerMaterial)
         
            CBUFFER_END
            TEXTURE2D(_CameraDepthTexture);SAMPLER(sampler_CameraDepthTexture);

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

                o.positionCS = TransformObjectToHClip(v.vertex.xyz);
                o.positionSS = ComputeScreenPos(o.positionCS);
                return o;
            }

            half4 frag(v2f i) : SV_Target
            {
                // 采样深度图
                // float2 screenUV = i.positionSS.xy / i.positionSS.w;
                float2 screenUV = i.positionCS.xy / _ScreenParams.xy;
                half4 depthMap = SAMPLE_TEXTURE2D(_CameraDepthTexture, sampler_CameraDepthTexture, screenUV);
                
                // 返回观察空间下的z值
                // half depthZ = LinearEyeDepth(depthMap,_ZBufferParams);
                // return frac(depthZ);
                
                // 返回处理后的z值，0~1
                half depthZ = Linear01Depth(depthMap.x, _ZBufferParams);
                return depthZ;
            }

            ENDHLSL
        }
    }

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

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

            struct appdata
            {
                float4 vertex : POSITION;
            };

            struct v2f
            {
                float4 positionCS : SV_POSITION;
                float4 positionSS : TEXCOORD0; 
            };

            sampler2D _CameraDepthTexture;

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

                o.positionCS = UnityObjectToClipPos(v.vertex.xyz);
                o.positionSS = ComputeScreenPos(o.positionCS);
                return o;
            }

            half4 frag(v2f i) : SV_Target
            {
                // 采样深度图
                // float2 screenUV = i.positionSS.xy / i.positionSS.w;
                float2 screenUV = i.positionCS.xy / _ScreenParams.xy;
                half4 depthMap = tex2D(_CameraDepthTexture, screenUV);
                
                // 返回观察空间下的z值
                // half depthZ = LinearEyeDepth(depthMap);
                // return frac(depthZ);
                
                // 返回处理后的z值，0~1
                half depthZ = Linear01Depth(depthMap);
                return depthZ;
            }

            ENDCG
        }
    }
}