#ifndef UNIVERSAL_POSTPROCESSING_SMAA_BRIDGE
#define UNIVERSAL_POSTPROCESSING_SMAA_BRIDGE

#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl"
#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"
#include "Packages/com.unity.render-pipelines.universal/Shaders/PostProcessing/Common.hlsl"

#define SMAA_HLSL_4_1

#if _SMAA_PRESET_LOW
    #define SMAA_PRESET_LOW
#elif _SMAA_PRESET_MEDIUM
    #define SMAA_PRESET_MEDIUM
#else
    #define SMAA_PRESET_HIGH
#endif

TEXTURE2D_X(_BlendTexture);
TEXTURE2D(_AreaTexture);
TEXTURE2D(_SearchTexture);

float4 _Metrics;

#define SMAA_RT_METRICS _Metrics
#define SMAA_AREATEX_SELECT(s) s.rg
#define SMAA_SEARCHTEX_SELECT(s) s.a
#define LinearSampler sampler_LinearClamp
#define PointSampler sampler_PointClamp

#if UNITY_COLORSPACE_GAMMA
    #define GAMMA_FOR_EDGE_DETECTION (1)
#else
    #define GAMMA_FOR_EDGE_DETECTION (1/2.2)
#endif

#include "Packages/com.unity.render-pipelines.universal/Shaders/PostProcessing/SubpixelMorphologicalAntialiasing.hlsl"

// ----------------------------------------------------------------------------------------
// Edge Detection

struct VaryingsEdge
{
    float4 positionCS    : SV_POSITION;
    float2 texcoord      : TEXCOORD0;
    float4 offsets[3]    : TEXCOORD1;
    UNITY_VERTEX_OUTPUT_STEREO
};

VaryingsEdge VertEdge(Attributes input)
{
    VaryingsEdge output;
    UNITY_SETUP_INSTANCE_ID(input);
    UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

    float4 pos = GetFullScreenTriangleVertexPosition(input.vertexID);
    float2 uv  = GetFullScreenTriangleTexCoord(input.vertexID);

    output.positionCS = pos;
    output.texcoord   = DYNAMIC_SCALING_APPLY_SCALEBIAS(uv);

    SMAAEdgeDetectionVS(output.texcoord, output.offsets);
    return output;
}

float4 FragEdge(VaryingsEdge input) : SV_Target
{
    UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
    return float4(SMAAColorEdgeDetectionPS(input.texcoord, input.offsets, _BlitTexture), 0.0, 0.0);
}

// ----------------------------------------------------------------------------------------
// Blend Weights Calculation

struct VaryingsBlend
{
    float4 positionCS    : SV_POSITION;
    float2 texcoord      : TEXCOORD0;
    float2 pixcoord      : TEXCOORD1;
    float4 offsets[3]    : TEXCOORD2;
    UNITY_VERTEX_OUTPUT_STEREO
};

VaryingsBlend VertBlend(Attributes input)
{
    VaryingsBlend output;
    UNITY_SETUP_INSTANCE_ID(input);
    UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

    float4 pos = GetFullScreenTriangleVertexPosition(input.vertexID);
    float2 uv  = GetFullScreenTriangleTexCoord(input.vertexID);

    output.positionCS = pos;
    output.texcoord   = DYNAMIC_SCALING_APPLY_SCALEBIAS(uv);

    SMAABlendingWeightCalculationVS(output.texcoord, output.pixcoord, output.offsets);
    return output;
}

float4 FragBlend(VaryingsBlend input) : SV_Target
{
    UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
    return SMAABlendingWeightCalculationPS(input.texcoord, input.pixcoord, input.offsets, _BlitTexture, _AreaTexture, _SearchTexture, 0);
}

// ----------------------------------------------------------------------------------------
// Neighborhood Blending

struct VaryingsNeighbor
{
    float4 positionCS    : SV_POSITION;
    float2 texcoord      : TEXCOORD0;
    float4 offset        : TEXCOORD1;
    UNITY_VERTEX_OUTPUT_STEREO
};

VaryingsNeighbor VertNeighbor(Attributes input)
{
    VaryingsNeighbor output;
    UNITY_SETUP_INSTANCE_ID(input);
    UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(output);

    float4 pos = GetFullScreenTriangleVertexPosition(input.vertexID);
    float2 uv  = GetFullScreenTriangleTexCoord(input.vertexID);

    output.positionCS = pos;
    output.texcoord   = DYNAMIC_SCALING_APPLY_SCALEBIAS(uv);

    SMAANeighborhoodBlendingVS(output.texcoord, output.offset);
    return output;
}

float4 FragNeighbor(VaryingsNeighbor input) : SV_Target
{
    UNITY_SETUP_STEREO_EYE_INDEX_POST_VERTEX(input);
    return SMAANeighborhoodBlendingPS(input.texcoord, input.offset, _BlitTexture, _BlendTexture);
}

#endif // UNIVERSAL_POSTPROCESSING_SMAA_BRIDGE
<URP>/Shaders/PostProcessing/SubpixelMorphologicalAntialiasingBridge.hlsl full source
