我不明白

Signed-off-by: TRAfoer <lhf190@outlook.com>

Assets/Shaders/glitch_analog.shader

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+Shader "Custom/GlitchAnalog"
+{
+    Properties
+    {
+        _MainTex ("Texture", 2D) = "white" {}
+        _GlitchIntensity ("Glitch Intensity", Range(0,1)) = 0.5
+    }
+    SubShader
+    {
+       Tags { "Queue"="Overlay" "RenderType"="Transparent" }
+ZTest Always
+ZWrite Off
+Cull Off
+Blend SrcAlpha OneMinusSrcAlpha
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            #include "UnityCG.cginc"
+
+            sampler2D _MainTex;
+            float4 _MainTex_ST;
+            float _GlitchIntensity;
+
+            struct appdata {
+                float4 vertex : POSITION;
+                float2 uv : TEXCOORD0;
+            };
+            struct v2f {
+                float2 uv : TEXCOORD0;
+                float4 vertex : SV_POSITION;
+            };
+            v2f vert (appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                o.uv = v.uv;
+                return o;
+            }
+
+            float nrand(float x, float y)
+            {
+                float2 p = float2(x, y);
+                float n = sin(dot(p, float2(12.9898, 78.233))) * 43758.5453;
+                n = frac(n);
+                n += frac(sin(dot(p * 2.0, float2(39.3468, 11.1351)) + _Time.y * 1.7) * 23421.631);
+                n += frac(sin(dot(p * 4.0, float2(73.1567, 52.2351)) - _Time.y * 2.3) * 12345.678);
+                return frac(n);
+            }
+
+            fixed4 frag (v2f i) : SV_Target
+            {
+                float2 uv = i.uv;
+                float4 rgba = tex2D(_MainTex, uv);
+
+                // 统一强度控制
+                float intensity = _GlitchIntensity;
+
+                // 色彩分离和撕裂
+                float chromaAmount = (0.01 + abs(sin(_Time.y * 1.3)) * 0.02) * intensity;
+                float tearStrength = (nrand(uv.y * 20.0 + _Time.y * 2.0, _Time.y * 1.3) - 0.5) * 0.15 * intensity;
+
+                float2 uvR = uv + float2(chromaAmount, 0) + float2(tearStrength, 0);
+                float2 uvG = uv + float2(0, 0) + float2(tearStrength * 0.5, 0);
+                float2 uvB = uv - float2(chromaAmount, 0) + float2(tearStrength, 0);
+                float r = tex2D(_MainTex, frac(uvR)).r;
+                float g = tex2D(_MainTex, frac(uvG)).g;
+                float b = tex2D(_MainTex, frac(uvB)).b;
+                float3 chromaColor = float3(r, g, b);
+
+                // 扫描线扰动
+                float scanJitter = (nrand(uv.y * 60.0, _Time.y * 0.5) - 0.5) * 0.2 * intensity;
+                float2 scanUV = uv + float2(scanJitter, 0);
+                float3 scanColor = tex2D(_MainTex, frac(scanUV)).rgb;
+
+                // 明暗扫描线效果
+                float scanLine = 0.85 + 0.15 * sin(uv.y * 800.0 + _Time.y * 10.0);
+                scanColor *= scanLine;
+
+                // 合成最终颜色
+                float3 finalColor = lerp(chromaColor, scanColor, 0.7 * intensity);
+
+                return float4(finalColor, rgba.a);
+            }
+            ENDCG
+        }
+    }
+}