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unity-shader-post-cameraFocus

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ScreenRipple.shader

ScreenRipple.hlsl
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#ifndef __CAMERA_FOCUS_HLSL__
#define __CAMERA_FOCUS_HLSL__

#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
{
    float2 uv : TEXCOORD0;
    float4 positionCS : SV_POSITION;
    float4 positionSS : TEXCOORD1;
};

// 计算模糊颜色
// @uvXFac：uvX方向的偏移系数
// @uvYFac：uvY方向的偏移系数
// @blurSize：模糊程度值
half4 CalcBlurColor(v2f i, Texture2D _MainTex, SamplerState sampler_MainTex, half uvXFac, half uvYFac, half blurSize)
{
    float blurSize2 = blurSize * 0.001;     // 这里缩小，外部拖动小数太小不好拖
    float uvXFac2 = uvXFac * blurSize2;
    float uvYFac2 = uvYFac * blurSize2;
    
    float2 uv = i.uv;

    half4 color = half4(0,0,0,0);
    color += 0.01621622 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv - float2(uvXFac2 * 4.0, uvYFac2 * 4.0));
    color += 0.05405405 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv - float2(uvXFac2 * 3.0, uvYFac2 * 3.0));
    color += 0.12162162 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv - float2(uvXFac2 * 2.0, uvYFac2 * 2.0));
    color += 0.19459459 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv - float2(uvXFac2 * 1.0, uvYFac2 * 1.0));
    color += 0.22702703 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv                               );
    color += 0.19459459 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv + float2(uvXFac2 * 1.0, uvYFac2 * 1.0));
    color += 0.12162162 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv + float2(uvXFac2 * 2.0, uvYFac2 * 2.0));
    color += 0.05405405 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv + float2(uvXFac2 * 3.0, uvYFac2 * 3.0));
    color += 0.01621622 * SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv + float2(uvXFac2 * 4.0, uvYFac2 * 4.0));

    return color;
}

// 计算聚焦颜色
// @blurColor：模糊颜色
// @blurDist：有效的模糊距离，超过这个值才会模糊
half4 CalcFocusColor(v2f i, Texture2D _MainTex, SamplerState sampler_MainTex, Texture2D _CameraDepthTexture, SamplerState sampler_CameraDepthTexture,
    half4 blurColor, half blurDist)
{
    // 计算深度值
    float2 screenUV = i.positionCS.xy/_ScreenParams.xy;
    half4 depthMap = SAMPLE_TEXTURE2D(_CameraDepthTexture, sampler_CameraDepthTexture, screenUV);
    half depthZ = Linear01Depth(depthMap.x, _ZBufferParams);

    // 计算模糊系数
    half blur = step(depthZ, blurDist * 0.01f);

    // 输出颜色处理
    half4 mainColor = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, i.uv);
    half4 outColor = mainColor * blur + blurColor * (1 - blur);

    return outColor;
}

v2f vert (appdata v)
{
    v2f o;
    o.positionCS = TransformObjectToHClip(v.vertex.xyz);
    o.positionSS = ComputeScreenPos(o.positionCS);
    o.uv = v.uv;
                
    return o;
}

#endif // __CAMERA_FOCUS_HLSL__
CameraFocus.shader
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Shader "HHF/Post/CameraFocus"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _FocusParam ("Focus Param(depth, blurSize)", Vector) = (1, 1, 1, 0)
    }
    
    SubShader
    {
        Tags { "RenderPipeline" = "UniversalPipeline" }
        Cull Off ZWrite Off ZTest Always

        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 "CameraFocus.hlsl"
            
            CBUFFER_START(UnityPerMaterial)
            float4 _MainTex_ST;
            half4 _FocusParam;
            CBUFFER_END
      
            TEXTURE2D (_MainTex);SAMPLER(sampler_MainTex);
            TEXTURE2D(_CameraDepthTexture);SAMPLER(sampler_CameraDepthTexture);

            half4 frag (v2f i) : SV_Target
            {
                half4 blurColor = CalcBlurColor(i, _MainTex, sampler_MainTex, 1, 1, _FocusParam.y);
                half4 outColor = CalcFocusColor(i, _MainTex, sampler_MainTex, _CameraDepthTexture, sampler_CameraDepthTexture, blurColor, _FocusParam.x );

                return outColor;
            }

            ENDHLSL
        }
        
        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 "CameraFocus.hlsl"
            
            CBUFFER_START(UnityPerMaterial)
            float4 _MainTex_ST;
            half4 _FocusParam;
            CBUFFER_END

            TEXTURE2D (_MainTex);SAMPLER(sampler_MainTex);
            TEXTURE2D(_CameraDepthTexture);SAMPLER(sampler_CameraDepthTexture);

            half4 frag (v2f i) : SV_Target
            {
                half4 blurColor = CalcBlurColor(i, _MainTex, sampler_MainTex, -1, 1, _FocusParam.y);
                half4 outColor = CalcFocusColor(i, _MainTex, sampler_MainTex, _CameraDepthTexture, sampler_CameraDepthTexture, blurColor, _FocusParam.x );

                return outColor;
            }

            ENDHLSL
        }
    }
    
}