URP

xft_displacement_screen.shader

Shader "Xffect/displacement/screen"
{
    Properties
    {
        _DispMap("Displacement Map (RG)", 2D) = "white" {}
        _MaskTex("Mask (R)", 2D) = "white" {}
        _DispScrollSpeedX("Map Scroll Speed X", Float) = 0
        _DispScrollSpeedY("Map Scroll Speed Y", Float) = 0
        _StrengthX("Displacement Strength X", Float) = 1
        _StrengthY("Displacement Strength Y", Float) = -1
    }

    HLSLINCLUDE
    #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl"

    TEXTURE2D(_DispMap); // Declare the texture
    SAMPLER(sampler_DispMap); // This is automatically defined, no need to manually declare
    TEXTURE2D(_MaskTex); // Declare the mask texture
    SAMPLER(sampler_MaskTex); // This is automatically defined, no need to manually declare
    TEXTURE2D(_GrabTexture); // Declare the grab texture, assuming you set this in your engine
    SAMPLER(sampler_GrabTexture); // This is automatically defined, no need to manually declare

    CBUFFER_START(ShaderProperties)
    float _DispScrollSpeedX;
    float _DispScrollSpeedY;
    float _StrengthX;
    float _StrengthY;
    CBUFFER_END

    struct Attributes
    {
        float4 positionOS : POSITION;
        float4 color : COLOR;
        float2 texcoord : TEXCOORD0;
    };

    struct Varyings
    {
        float4 positionCS : SV_POSITION;
        float4 color : COLOR;
        float2 texcoord : TEXCOORD0;
        float2 screenUV : TEXCOORD1;
    };

    Varyings MainVert(Attributes IN)
    {
        Varyings OUT;
        OUT.positionCS = TransformObjectToHClip(IN.positionOS.xyz);
        OUT.color = IN.color;
        OUT.texcoord = IN.texcoord;

        float4 screenPos = ComputeScreenPos(OUT.positionCS);
        OUT.screenUV = screenPos.xy / screenPos.w;

        return OUT;
    }

    float4 MainFrag(Varyings IN) : SV_Target
    {
        float2 displacement = SAMPLE_TEXTURE2D(_DispMap, sampler_DispMap, IN.texcoord).rg;
        float2 scrolledUV = IN.texcoord + _Time.yy * float2(_DispScrollSpeedX, _DispScrollSpeedY);

        displacement = float2(displacement.r - 0.5, displacement.g - 0.5) * 2.0;
        displacement *= float2(_StrengthX, _StrengthY);
        float4 color = SAMPLE_TEXTURE2D(_GrabTexture, sampler_GrabTexture, IN.screenUV + displacement);

        color.a *= SAMPLE_TEXTURE2D(_MaskTex, sampler_MaskTex, IN.texcoord).r;
        return color * IN.color;
    }
    ENDHLSL

    SubShader
    {
        Tags { "RenderType"="Transparent" "Queue"="Transparent+99" }
        Blend SrcAlpha OneMinusSrcAlpha
        ZWrite Off
        Cull Off

        Pass
        {
            Name "BASE"
            HLSLPROGRAM
            #pragma vertex MainVert
            #pragma fragment MainFrag
            ENDHLSL
        }
    }
    FallBack "Diffuse"
}