declare const _default: "\n// the envAtlas is fixed at 512 pixels. every equirect is generated with 1 pixel boundary.\nconst float atlasSize = 512.0;\nconst float seamSize = 1.0 / atlasSize;\n\n// map a normalized equirect UV to the given rectangle (taking 1 pixel seam into account).\nvec2 mapUv(vec2 uv, vec4 rect) {\n    return vec2(mix(rect.x + seamSize, rect.x + rect.z - seamSize, uv.x),\n                mix(rect.y + seamSize, rect.y + rect.w - seamSize, uv.y));\n}\n\n// map a normalized equirect UV and roughness level to the correct atlas rect.\nvec2 mapRoughnessUv(vec2 uv, float level) {\n    float t = 1.0 / exp2(level);\n    return mapUv(uv, vec4(0, 1.0 - t, t, t * 0.5));\n}\n\n// map shiny level UV\nvec2 mapShinyUv(vec2 uv, float level) {\n    float t = 1.0 / exp2(level);\n    return mapUv(uv, vec4(1.0 - t, 1.0 - t, t, t * 0.5));\n}\n";
export default _default;