https://wikit.co/_next/static/chunks/1983.88adea0bbbb45a66.js

1"use strict";(self.webpackChunk_N_E=self.webpackChunk_N_E||[]).push([[1983],{41983:(e,n,o)=>{o.r(n),o.d(n,{default:()=>r});var r="precision highp float;\nvarying vec2 v_texCoord;\n\nuniform sampler2D u_texture;\nuniform sampler2D maskTexture;\nuniform vec2 blurVector;\nuniform bool usesMask;\n#define MAX_SIZE 63\n\nuniform int kernelSize;\nuniform float coefficients[MAX_SIZE];\n\n// 알파 인지형 가우시안 블러\n// - 각 샘플의 RGB는 알파를 곱해 합산(프리멀티플라이)\n// - 알파는 별도로 같은 커널로 합산 후 정규화\n// - 최종 RGB는 sumRGB / sumAlpha 로 언프리멀티플라이\nvoid main()\n{\n    float maskWeight = usesMask ? (1.0 - texture2D(maskTexture, v_texCoord).r) : 1.0;\n    vec2 maskedBlurVector = blurVector * maskWeight;\n\n    vec3 sumColor = vec3(0.0);\n    float sumAlpha = 0.0;\n    float coeffSum = 0.0;\n\n    // center\n    vec4 c0 = texture2D(u_texture, v_texCoord);\n    sumColor += c0.rgb * c0.a * coefficients[0];\n    sumAlpha += c0.a * coefficients[0];\n    coeffSum += coefficients[0];\n\n    for (int i = 1; i < kernelSize; i++) {\n        float w = coefficients[i];\n        vec2 o = float(i) * maskedBlurVector;\n        vec4 s1 = texture2D(u_texture, clamp(v_texCoord - o, 0.0, 1.0));\n        vec4 s2 = texture2D(u_texture, clamp(v_texCoord + o, 0.0, 1.0));\n\n        sumColor += s1.rgb * s1.a * w;\n        sumColor += s2.rgb * s2.a * w;\n        sumAlpha += s1.a * w;\n        sumAlpha += s2.a * w;\n        coeffSum += 2.0 * w;\n    }\n\n    float a = sumAlpha / max(coeffSum, 1e-6);\n    vec3 rgb = a > 0.0 ? (sumColor / max(sumAlpha, 1e-6)) : vec3(0.0);\n    gl_FragColor = vec4(rgb, a);\n}"}}]);