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float _alpha = s0 * s1 * s2 * s3 * 1.0;\n    float alpha = smoothstep(0.2, 0.2 + 0.2, _alpha);\n    float black = smoothstep(0.05, 0.09, _alpha);\n    float c0 = smoothstep(1.0 - cornerParams.x, 1.0, uv0.x - 0.01);\n    float c2 = 1.0 - smoothstep(0.0, cornerParams.y, uv0.x + 0.01);\n    float c1 = smoothstep(1.0 - cornerParams.z, 1.0, uv0.y - 0.01);\n    float c3 = 1.0 - smoothstep(0.0, cornerParams.w, uv0.y + 0.01);\n    float _alpha2 = c0 * c1 + c1 * c2 + c2 * c3 + c3 * c0;\n    float alpha2 = 1.0 - smoothstep(0.95, 0.95 + 0.02, _alpha2);\n    float black2 = 1.0 - smoothstep(0.90, 0.90 + 0.02, _alpha2);\n    float alpha_factor = min(alpha, alpha2);\n    float black_factor = min(black, black2);\n    o.a = black_factor;\n    o.rgb = mix(edgeColor.rgb, o.rgb, alpha_factor);\n    #if IS_GRAY\n      float gray = 0.2126 * o.r + 0.7152 * o.g + 0.0722 * o.b;\n      o.r = o.g = o.b = gray;\n    #endif\n  #endif\n  o *= color;\n  ALPHA_TEST(o);\n  return o;\n}\nvoid main() { gl_FragColor = 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