PaperFoldPervertedVersion/Assets/_Scenes/AntiAliasingShader.shader

Shader "Custom/AntiAliasingShader"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
    }
    
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"
            
            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };
            
            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };
            
            sampler2D _MainTex;
            
            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }
            
            fixed4 frag (v2f i) : SV_Target
            {
                fixed4 color = tex2D(_MainTex, i.uv);
                
                // 取周围像素的平均值来模拟抗锯齿效果
                float2 uvOffset = 1.0 / _ScreenParams.xy;
                color += tex2D(_MainTex, i.uv + float2(-uvOffset.x, -uvOffset.y));
                color += tex2D(_MainTex, i.uv + float2(-uvOffset.x, uvOffset.y));
                color += tex2D(_MainTex, i.uv + float2(uvOffset.x, -uvOffset.y));
                color += tex2D(_MainTex, i.uv + float2(uvOffset.x, uvOffset.y));
                color /= 5.0;
                
                return color;
            }
            ENDCG
        }
    }
}