Demo 92 - Outline and screenspace texture

Shader "Custom/Outline and ScreenSpace texture"
{
    Properties
    {
        [Header(Outline)]
        _OutlineVal ("Outline value", Range(0., 2.)) = 1.
        _OutlineCol ("Outline color", color) = (1., 1., 1., 1.)
        [Header(Texture)]
        _MainTex ("Texture", 2D) = "white" {}
        _Zoom ("Zoom", Range(0.5, 20)) = 1
        _SpeedX ("Speed along X", Range(-1, 1)) = 0
        _SpeedY ("Speed along Y", Range(-1, 1)) = 0
    }
    SubShader
    {
        Tags { "Queue"="Geometry" "RenderType"="Opaque" }

        Pass
        {
            Cull Front

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

            struct v2f {
                float4 pos : SV_POSITION;
            };

            float _OutlineVal;

            v2f vert(appdata_base v) {
                v2f o;

                // Convert vertex to clip space
                o.pos = mul(UNITY_MATRIX_MVP, v.vertex);

                // Convert normal to view space (camera space)
                float3 normal = mul((float3x3) UNITY_MATRIX_IT_MV, v.normal);

                // Compute normal value in clip space
                normal.x *= UNITY_MATRIX_P[0][0];
                normal.y *= UNITY_MATRIX_P[1][1];

                // Scale the model depending the previous computed normal and outline value
                o.pos.xy += _OutlineVal * normal.xy;
                return o;
            }

            fixed4 _OutlineCol;

            fixed4 frag(v2f i) : SV_Target {
                return _OutlineCol;
            }

            ENDCG
        }

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

            float4 vert(appdata_base v) : SV_POSITION
            {
                return mul(UNITY_MATRIX_MVP, v.vertex);
            }

            sampler2D _MainTex;
            float _Zoom;
            float _SpeedX;
            float _SpeedY;

            fixed4 frag(float4 i : VPOS) : SV_Target
            {
                // Screen space texture
                return tex2D(_MainTex, ((i.xy / _ScreenParams.xy) + float2(_Time.y * _SpeedX, _Time.y * _SpeedY)) / _Zoom);
            }

            ENDCG
        }
    }
}