playcanvas/build/playcanvas/src/scene/shader-lib/glsl/chunks/lit/frag/fresnelSchlick.d.ts

Open-source WebGL/WebGPU 3D engine for the web

declare const _default: "\n// pow(x, 5) implemented as multiplies to avoid the log2/exp2 pair pow compiles to\nfloat pow5(float x) {\n    float x2 = x * x;\n    return x2 * x2 * x;\n}\n\n// Schlick's approximation\nvec3 getFresnel(\n        float cosTheta, \n        float gloss, \n        vec3 specularity\n#if defined(LIT_IRIDESCENCE)\n        , vec3 iridescenceFresnel, \n        float iridescenceIntensity\n#endif\n    ) {\n    float fresnel = pow5(1.0 - saturate(cosTheta));\n    float glossSq = gloss * gloss;\n\n    // Scale gloss contribution by specularity intensity to ensure F90 approaches 0 when F0 is 0\n    float specIntensity = max(specularity.r, max(specularity.g, specularity.b));\n    vec3 ret = specularity + (max(vec3(glossSq * specIntensity), specularity) - specularity) * fresnel;\n\n#if defined(LIT_IRIDESCENCE)\n    return mix(ret, iridescenceFresnel, iridescenceIntensity);\n#else\n    return ret;\n#endif    \n}\n\nfloat getFresnelCC(float cosTheta) {\n    float fresnel = pow5(1.0 - saturate(cosTheta));\n    return 0.04 + (1.0 - 0.04) * fresnel;\n}\n";
export default _default;