/**
 * Copyright (c) 2019-2021 mol* contributors, licensed under MIT, See LICENSE file for more info.
 *
 * @author Alexander Rose <alexander.rose@weirdbyte.de>
 */
export declare const spheres_frag = "\nprecision highp float;\nprecision highp int;\n\n#include common\n#include common_frag_params\n#include color_frag_params\n#include light_frag_params\n#include common_clip\n\nvarying float vRadius;\nvarying float vRadiusSq;\nvarying vec3 vPoint;\nvarying vec3 vPointViewPosition;\n\nvec3 cameraPos;\nvec3 cameraNormal;\n\nbool Impostor(out vec3 cameraPos, out vec3 cameraNormal){\n    vec3 cameraSpherePos = -vPointViewPosition;\n    cameraSpherePos.z += vRadius;\n\n    vec3 rayOrigin = mix(vec3(0.0, 0.0, 0.0), vPoint, uIsOrtho);\n    vec3 rayDirection = mix(normalize(vPoint), vec3(0.0, 0.0, 1.0), uIsOrtho);\n    vec3 cameraSphereDir = mix(cameraSpherePos, rayOrigin - cameraSpherePos, uIsOrtho);\n\n    float B = dot(rayDirection, cameraSphereDir);\n    float det = B * B + vRadiusSq - dot(cameraSphereDir, cameraSphereDir);\n\n    if (det < 0.0){\n        discard;\n        return false;\n    }\n\n    float sqrtDet = sqrt(det);\n    float posT = mix(B + sqrtDet, B + sqrtDet, uIsOrtho);\n    float negT = mix(B - sqrtDet, sqrtDet - B, uIsOrtho);\n\n    cameraPos = rayDirection * negT + rayOrigin;\n\n\n    if (calcDepth(cameraPos) <= 0.0) {\n        cameraPos = rayDirection * posT + rayOrigin;\n        interior = true;\n    } else {\n        interior = false;\n    }\n\n    cameraNormal = normalize(cameraPos - cameraSpherePos);\n    cameraNormal *= float(!interior) * 2.0 - 1.0;\n\n    return !interior;\n}\n\nvoid main(void){\n    #include clip_pixel\n\n    bool flag = Impostor(cameraPos, cameraNormal);\n    #ifndef dDoubleSided\n        if (interior)\n            discard;\n    #endif\n\n    vec3 vViewPosition = cameraPos;\n    gl_FragDepthEXT = calcDepth(vViewPosition);\n    if (!flag && gl_FragDepthEXT >= 0.0) {\n        gl_FragDepthEXT = 0.0 + (0.0000001 / vRadius);\n    }\n\n    // bugfix (mac only?)\n    if (gl_FragDepthEXT < 0.0) discard;\n    if (gl_FragDepthEXT > 1.0) discard;\n\n    float fragmentDepth = gl_FragDepthEXT;\n    #include assign_material_color\n\n    #if defined(dRenderVariant_pick)\n        #include check_picking_alpha\n        gl_FragColor = material;\n    #elif defined(dRenderVariant_depth)\n        gl_FragColor = material;\n    #elif defined(dRenderVariant_marking)\n        gl_FragColor = material;\n    #elif defined(dRenderVariant_color)\n        #ifdef dIgnoreLight\n            gl_FragColor = material;\n        #else\n            vec3 normal = -cameraNormal;\n            #include apply_light_color\n        #endif\n\n        #include apply_interior_color\n        #include apply_marker_color\n        #include apply_fog\n        #include wboit_write\n    #endif\n}\n";