/**
 * Copyright (c) 2019-2022 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#define bumpEnabled\n\n#include common\n#include common_frag_params\n#include color_frag_params\n#include light_frag_params\n#include common_clip\n\nuniform mat4 uInvView;\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    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    if (!uDoubleSided) {\n        if (interior) discard;\n    }\n\n    vec3 vViewPosition = cameraPos;\n    float fragmentDepth = calcDepth(vViewPosition);\n    if (!flag && fragmentDepth >= 0.0) {\n        fragmentDepth = 0.0 + (0.0000001 / vRadius);\n    }\n\n    if (fragmentDepth < 0.0) discard;\n    if (fragmentDepth > 1.0) discard;\n\n    gl_FragDepthEXT = fragmentDepth;\n\n    vec3 vModelPosition = (uInvView * vec4(vViewPosition, 1.0)).xyz;\n    #include assign_material_color\n\n    #if defined(dRenderVariant_pick)\n        #include check_picking_alpha\n        #ifdef requiredDrawBuffers\n            gl_FragColor = vObject;\n            gl_FragData[1] = vInstance;\n            gl_FragData[2] = vGroup;\n            gl_FragData[3] = packDepthToRGBA(fragmentDepth);\n        #else\n            gl_FragColor = vColor;\n        #endif\n    #elif defined(dRenderVariant_depth)\n        gl_FragColor = material;\n    #elif defined(dRenderVariant_marking)\n        gl_FragColor = material;\n    #elif defined(dRenderVariant_color)\n        vec3 normal = -cameraNormal;\n        #include apply_light_color\n\n        #include apply_interior_color\n        #include apply_marker_color\n        #include apply_fog\n        #include wboit_write\n        #include dpoit_write\n    #endif\n}\n";