[Unity] Creating my own shader with shadows for LightWeightRenderPipeline(LWRP)

CustomAutoLight.cginc

sampler2D _ScreenSpaceShadowMap;

#define SHADOW_COORDS(idx1) float4 shadowCoord : TEXCOORD##idx1;
#define TRANSFER_SHADOW(a) a.shadowCoord = CustomCalculateScreenPos(a.pos)
#define SHADOW_ATTENUATION(i) tex2D(_ScreenSpaceShadowMap, i.shadowCoord.xy/i.shadowCoord.w).x

inline float4 CustomCalculateScreenPos(float4 pos) {
	float4 o = pos * 0.5f;
	o.xy = float2(o.x, o.y*_ProjectionParams.x) + o.w;
	o.zw = pos.zw;
	return o;
}

ShadowTest.shader

Shader "App/ShadowTest"
{

    Properties
    {
        [NoScaleOffset] _MainTex("Texture", 2D) = "white" {}
    }
    SubShader
    {
        Pass
        {
            Tags{ "LightMode" = "LightweightForward" }
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"
            #include "CustomAutoLight.cginc"

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 shadowCoord : TEXCOORD1;
                float4 pos : SV_POSITION;
            };

            inline float4 CalculateScreenPos(float4 pos) {
                float4 o = pos * 0.5f;
                o.xy = float2(o.x, o.y*_ProjectionParams.x) + o.w;
                o.zw = pos.zw;
                return o;
            }
            v2f vert(appdata_base v)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                o.uv = v.texcoord;
                // compute shadows data
                TRANSFER_SHADOW(o);
                return o;
            }

            sampler2D _MainTex;

            fixed4 frag(v2f i) : SV_Target
            {
                fixed4 col = tex2D(_MainTex, i.uv);
                fixed shadow = SHADOW_ATTENUATION(i);

                col.rgb *= clamp(shadow + 0.5, 0.0,1.0);

                return col;
            }
            ENDCG
        }

        Pass{
                Tags{ "LightMode" = "DepthOnly" }
                ZWrite On
                ColorMask 0
                Cull[_Cull]

                CGPROGRAM
                #pragma vertex depthVert
                #pragma fragment depthFrag
                #include "UnityCG.cginc"
                struct v2f
                {
                    float4 pos : SV_POSITION;
                };

                v2f depthVert(appdata_base v)
                {
                    v2f o;
                    o.pos = UnityObjectToClipPos(v.vertex);
                    return o;
                }
                fixed4 depthFrag(v2f i) : SV_Target
                {
                    return 0;
                }
                ENDCG
        }
                
        Pass
        {
            Tags{"LightMode" = "ShadowCaster"}

            ZWrite On
            ZTest LEqual
            Cull[_Cull]

            HLSLPROGRAM
            // Required to compile gles 2.0 with standard srp library
            #pragma prefer_hlslcc gles
            #pragma exclude_renderers d3d11_9x
            #pragma target 2.0

            // -------------------------------------
            // Material Keywords
            #pragma shader_feature _ALPHATEST_ON

            //--------------------------------------
            // GPU Instancing
            #pragma multi_compile_instancing
            #pragma shader_feature _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A

            #pragma vertex ShadowPassVertex
            #pragma fragment ShadowPassFragment

            #include "LWRP/ShaderLibrary/InputSurfacePBR.hlsl"
            #include "LWRP/ShaderLibrary/LightweightPassShadow.hlsl"
            ENDHLSL
        }
    }
}