text: /**
   * Cesium - https://github.com/CesiumGS/cesium
   *
   * Copyright 2011-2020 Cesium Contributors
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   * Columbus View (Pat. Pend.)
   *
   * Portions licensed separately.
   * See https://github.com/CesiumGS/cesium/blob/master/LICENSE.md for full licensing details.
   */
  define(["exports"],function(E){"use strict";var _=Object.freeze({DEPTH_BUFFER_BIT:256,STENCIL_BUFFER_BIT:1024,COLOR_BUFFER_BIT:16384,POINTS:0,LINES:1,LINE_LOOP:2,LINE_STRIP:3,TRIANGLES:4,TRIANGLE_STRIP:5,TRIANGLE_FAN:6,ZERO:0,ONE:1,SRC_COLOR:768,ONE_MINUS_SRC_COLOR:769,SRC_ALPHA:770,ONE_MINUS_SRC_ALPHA:771,DST_ALPHA:772,ONE_MINUS_DST_ALPHA:773,DST_COLOR:774,ONE_MINUS_DST_COLOR:775,SRC_ALPHA_SATURATE:776,FUNC_ADD:32774,BLEND_EQUATION:32777,BLEND_EQUATION_RGB:32777,BLEND_EQUATION_ALPHA:34877,FUNC_SUBTRACT:32778,FUNC_REVERSE_SUBTRACT:32779,BLEND_DST_RGB:32968,BLEND_SRC_RGB:32969,BLEND_DST_ALPHA:32970,BLEND_SRC_ALPHA:32971,CONSTANT_COLOR:32769,ONE_MINUS_CONSTANT_COLOR:32770,CONSTANT_ALPHA:32771,ONE_MINUS_CONSTANT_ALPHA:32772,BLEND_COLOR:32773,ARRAY_BUFFER:34962,ELEMENT_ARRAY_BUFFER:34963,ARRAY_BUFFER_BINDING:34964,ELEMENT_ARRAY_BUFFER_BINDING:34965,STREAM_DRAW:35040,STATIC_DRAW:35044,DYNAMIC_DRAW:35048,BUFFER_SIZE:34660,BUFFER_USAGE:34661,CURRENT_VERTEX_ATTRIB:34342,FRONT:1028,BACK:1029,FRONT_AND_BACK:1032,CULL_FACE:2884,BLEND:3042,DITHER:3024,STENCIL_TEST:2960,DEPTH_TEST:2929,SCISSOR_TEST:3089,POLYGON_OFFSET_FILL:32823,SAMPLE_ALPHA_TO_COVERAGE:32926,SAMPLE_COVERAGE:32928,NO_ERROR:0,INVALID_ENUM:1280,INVALID_VALUE:1281,INVALID_OPERATION:1282,OUT_OF_MEMORY:1285,CW:2304,CCW:2305,LINE_WIDTH:2849,ALIASED_POINT_SIZE_RANGE:33901,ALIASED_LINE_WIDTH_RANGE:33902,CULL_FACE_MODE:2885,FRONT_FACE:2886,DEPTH_RANGE:2928,DEPTH_WRITEMASK:2930,DEPTH_CLEAR_VALUE:2931,DEPTH_FUNC:2932,STENCIL_CLEAR_VALUE:2961,STENCIL_FUNC:2962,STENCIL_FAIL:2964,STENCIL_PASS_DEPTH_FAIL:2965,STENCIL_PASS_DEPTH_PASS:2966,STENCIL_REF:2967,STENCIL_VALUE_MASK:2963,STENCIL_WRITEMASK:2968,STENCIL_BACK_FUNC:34816,STENCIL_BACK_FAIL:34817,STENCIL_BACK_PASS_DEPTH_FAIL:34818,STENCIL_BACK_PASS_DEPTH_PASS:34819,STENCIL_BACK_REF:36003,STENCIL_BACK_VALUE_MASK:36004,STENCIL_BACK_WRITEMASK:36005,VIEWPORT:2978,SCISSOR_BOX:3088,COLOR_CLEAR_VALUE:3106,COLOR_WRITEMASK:3107,UNPACK_ALIGNMENT:3317,PACK_ALIGNMENT:3333,MAX_TEXTURE_SIZE:3379,MAX_VIEWPORT_DIMS:3386,SUBPIXEL_BITS:3408,RED_BITS:3410,GREEN_BITS:3411,BLUE_BITS:3412,ALPHA_BITS:3413,DEPTH_BITS:3414,STENCIL_BITS:3415,POLYGON_OFFSET_UNITS:10752,POLYGON_OFFSET_FACTOR:32824,TEXTURE_BINDING_2D:32873,SAMPLE_BUFFERS:32936,SAMPLES:32937,SAMPLE_COVERAGE_VALUE:32938,SAMPLE_COVERAGE_INVERT:32939,COMPRESSED_TEXTURE_FORMATS:34467,DONT_CARE:4352,FASTEST:4353,NICEST:4354,GENERATE_MIPMAP_HINT:33170,BYTE:5120,UNSIGNED_BYTE:5121,SHORT:5122,UNSIGNED_SHORT:5123,INT:5124,UNSIGNED_INT:5125,FLOAT:5126,DEPTH_COMPONENT:6402,ALPHA:6406,RGB:6407,RGBA:6408,LUMINANCE:6409,LUMINANCE_ALPHA:6410,UNSIGNED_SHORT_4_4_4_4:32819,UNSIGNED_SHORT_5_5_5_1:32820,UNSIGNED_SHORT_5_6_5:33635,FRAGMENT_SHADER:35632,VERTEX_SHADER:35633,MAX_VERTEX_ATTRIBS:34921,MAX_VERTEX_UNIFORM_VECTORS:36347,MAX_VARYING_VECTORS:36348,MAX_COMBINED_TEXTURE_IMAGE_UNITS:35661,MAX_VERTEX_TEXTURE_IMAGE_UNITS:35660,MAX_TEXTURE_IMAGE_UNITS:34930,MAX_FRAGMENT_UNIFORM_VECTORS:36349,SHADER_TYPE:35663,DELETE_STATUS:35712,LINK_STATUS:35714,VALIDATE_STATUS:35715,ATTACHED_SHADERS:35717,ACTIVE_UNIFORMS:35718,ACTIVE_ATTRIBUTES:35721,SHADING_LANGUAGE_VERSION:35724,CURRENT_PROGRAM:35725,NEVER:512,LESS:513,EQUAL:514,LEQUAL:515,GREATER:516,NOTEQUAL:517,GEQUAL:518,ALWAYS:519,KEEP:7680,REPLACE:7681,INCR:7682,DECR:7683,INVERT:5386,INCR_WRAP:34055,DECR_WRAP:34056,VENDOR:7936,RENDERER:7937,VERSION:7938,NEAREST:9728,LINEAR:9729,NEAREST_MIPMAP_NEAREST:9984,LINEAR_MIPMAP_NEAREST:9985,NEAREST_MIPMAP_LINEAR:9986,LINEAR_MIPMAP_LINEAR:9987,TEXTURE_MAG_FILTER:10240,TEXTURE_MIN_FILTER:10241,TEXTURE_WRAP_S:10242,TEXTURE_WRAP_T:10243,TEXTURE_2D:3553,TEXTURE:5890,TEXTURE_CUBE_MAP:34067,TEXTURE_BINDING_CUBE_MAP:34068,TEXTURE_CUBE_MAP_POSITIVE_X:34069,TEXTURE_CUBE_MAP_NEGATIVE_X:34070,TEXTURE_CUBE_MAP_POSITIVE_Y:34071,TEXTURE_CUBE_MAP_NEGATIVE_Y:34072,TEXTURE_CUBE_MAP_POSITIVE_Z:34073,TEXTURE_CUBE_MAP_NEGATIVE_Z:34074,MAX_CUBE_MAP_TEXTURE_SIZE:34076,TEXTURE0:33984,TEXTURE1:33985,TEXTURE2:33986,TEXTURE3:33987,TEXTURE4:33988,TEXTURE5:33989,TEXTURE6:33990,TEXTURE7:33991,TEXTURE8:33992,TEXTURE9:33993,TEXTURE10:33994,TEXTURE11:33995,TEXTURE12:33996,TEXTURE13:33997,TEXTURE14:33998,TEXTURE15:33999,TEXTURE16:34e3,TEXTURE17:34001,TEXTURE18:34002,TEXTURE19:34003,TEXTURE20:34004,TEXTURE21:34005,TEXTURE22:34006,TEXTURE23:34007,TEXTURE24:34008,TEXTURE25:34009,TEXTURE26:34010,TEXTURE27:34011,TEXTURE28:34012,TEXTURE29:34013,TEXTURE30:34014,TEXTURE31:34015,ACTIVE_TEXTURE:34016,REPEAT:10497,CLAMP_TO_EDGE:33071,MIRRORED_REPEAT:33648,FLOAT_VEC2:35664,FLOAT_VEC3:35665,FLOAT_VEC4:35666,INT_VEC2:35667,INT_VEC3:35668,INT_VEC4:35669,BOOL:35670,BOOL_VEC2:35671,BOOL_VEC3:35672,BOOL_VEC4:35673,FLOAT_MAT2:35674,FLOAT_MAT3:35675,FLOAT_MAT4:35676,SAMPLER_2D:35678,SAMPLER_CUBE:35680,VERTEX_ATTRIB_ARRAY_ENABLED:34338,VERTEX_ATTRIB_ARRAY_SIZE:34339,VERTEX_ATTRIB_ARRAY_STRIDE:34340,VERTEX_ATTRIB_ARRAY_TYPE:34341,VERTEX_ATTRIB_ARRAY_NORMALIZED:34922,VERTEX_ATTRIB_ARRAY_POINTER:34373,VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:34975,IMPLEMENTATION_COLOR_READ_TYPE:35738,IMPLEMENTATION_COLOR_READ_FORMAT:35739,COMPILE_STATUS:35713,LOW_FLOAT:36336,MEDIUM_FLOAT:36337,HIGH_FLOAT:36338,LOW_INT:36339,MEDIUM_INT:36340,HIGH_INT:36341,FRAMEBUFFER:36160,RENDERBUFFER:36161,RGBA4:32854,RGB5_A1:32855,RGB565:36194,DEPTH_COMPONENT16:33189,STENCIL_INDEX:6401,STENCIL_INDEX8:36168,DEPTH_STENCIL:34041,RENDERBUFFER_WIDTH:36162,RENDERBUFFER_HEIGHT:36163,RENDERBUFFER_INTERNAL_FORMAT:36164,RENDERBUFFER_RED_SIZE:36176,RENDERBUFFER_GREEN_SIZE:36177,RENDERBUFFER_BLUE_SIZE:36178,RENDERBUFFER_ALPHA_SIZE:36179,RENDERBUFFER_DEPTH_SIZE:36180,RENDERBUFFER_STENCIL_SIZE:36181,FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:36048,FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:36049,FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:36050,FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:36051,COLOR_ATTACHMENT0:36064,DEPTH_ATTACHMENT:36096,STENCIL_ATTACHMENT:36128,DEPTH_STENCIL_ATTACHMENT:33306,NONE:0,FRAMEBUFFER_COMPLETE:36053,FRAMEBUFFER_INCOMPLETE_ATTACHMENT:36054,FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:36055,FRAMEBUFFER_INCOMPLETE_DIMENSIONS:36057,FRAMEBUFFER_UNSUPPORTED:36061,FRAMEBUFFER_BINDING:36006,RENDERBUFFER_BINDING:36007,MAX_RENDERBUFFER_SIZE:34024,INVALID_FRAMEBUFFER_OPERATION:1286,UNPACK_FLIP_Y_WEBGL:37440,UNPACK_PREMULTIPLY_ALPHA_WEBGL:37441,CONTEXT_LOST_WEBGL:37442,UNPACK_COLORSPACE_CONVERSION_WEBGL:37443,BROWSER_DEFAULT_WEBGL:37444,COMPRESSED_RGB_S3TC_DXT1_EXT:33776,COMPRESSED_RGBA_S3TC_DXT1_EXT:33777,COMPRESSED_RGBA_S3TC_DXT3_EXT:33778,COMPRESSED_RGBA_S3TC_DXT5_EXT:33779,COMPRESSED_RGB_PVRTC_4BPPV1_IMG:35840,COMPRESSED_RGB_PVRTC_2BPPV1_IMG:35841,COMPRESSED_RGBA_PVRTC_4BPPV1_IMG:35842,COMPRESSED_RGBA_PVRTC_2BPPV1_IMG:35843,COMPRESSED_RGB_ETC1_WEBGL:36196,HALF_FLOAT_OES:36193,DOUBLE:5130,READ_BUFFER:3074,UNPACK_ROW_LENGTH:3314,UNPACK_SKIP_ROWS:3315,UNPACK_SKIP_PIXELS:3316,PACK_ROW_LENGTH:3330,PACK_SKIP_ROWS:3331,PACK_SKIP_PIXELS:3332,COLOR:6144,DEPTH:6145,STENCIL:6146,RED:6403,RGB8:32849,RGBA8:32856,RGB10_A2:32857,TEXTURE_BINDING_3D:32874,UNPACK_SKIP_IMAGES:32877,UNPACK_IMAGE_HEIGHT:32878,TEXTURE_3D:32879,TEXTURE_WRAP_R:32882,MAX_3D_TEXTURE_SIZE:32883,UNSIGNED_INT_2_10_10_10_REV:33640,MAX_ELEMENTS_VERTICES:33e3,MAX_ELEMENTS_INDICES:33001,TEXTURE_MIN_LOD:33082,TEXTURE_MAX_LOD:33083,TEXTURE_BASE_LEVEL:33084,TEXTURE_MAX_LEVEL:33085,MIN:32775,MAX:32776,DEPTH_COMPONENT24:33190,MAX_TEXTURE_LOD_BIAS:34045,TEXTURE_COMPARE_MODE:34892,TEXTURE_COMPARE_FUNC:34893,CURRENT_QUERY:34917,QUERY_RESULT:34918,QUERY_RESULT_AVAILABLE:34919,STREAM_READ:35041,STREAM_COPY:35042,STATIC_READ:35045,STATIC_COPY:35046,DYNAMIC_READ:35049,DYNAMIC_COPY:35050,MAX_DRAW_BUFFERS:34852,DRAW_BUFFER0:34853,DRAW_BUFFER1:34854,DRAW_BUFFER2:34855,DRAW_BUFFER3:34856,DRAW_BUFFER4:34857,DRAW_BUFFER5:34858,DRAW_BUFFER6:34859,DRAW_BUFFER7:34860,DRAW_BUFFER8:34861,DRAW_BUFFER9:34862,DRAW_BUFFER10:34863,DRAW_BUFFER11:34864,DRAW_BUFFER12:34865,DRAW_BUFFER13:34866,DRAW_BUFFER14:34867,DRAW_BUFFER15:34868,MAX_FRAGMENT_UNIFORM_COMPONENTS:35657,MAX_VERTEX_UNIFORM_COMPONENTS:35658,SAMPLER_3D:35679,SAMPLER_2D_SHADOW:35682,FRAGMENT_SHADER_DERIVATIVE_HINT:35723,PIXEL_PACK_BUFFER:35051,PIXEL_UNPACK_BUFFER:35052,PIXEL_PACK_BUFFER_BINDING:35053,PIXEL_UNPACK_BUFFER_BINDING:35055,FLOAT_MAT2x3:35685,FLOAT_MAT2x4:35686,FLOAT_MAT3x2:35687,FLOAT_MAT3x4:35688,FLOAT_MAT4x2:35689,FLOAT_MAT4x3:35690,SRGB:35904,SRGB8:35905,SRGB8_ALPHA8:35907,COMPARE_REF_TO_TEXTURE:34894,RGBA32F:34836,RGB32F:34837,RGBA16F:34842,RGB16F:34843,VERTEX_ATTRIB_ARRAY_INTEGER:35069,MAX_ARRAY_TEXTURE_LAYERS:35071,MIN_PROGRAM_TEXEL_OFFSET:35076,MAX_PROGRAM_TEXEL_OFFSET:35077,MAX_VARYING_COMPONENTS:35659,TEXTURE_2D_ARRAY:35866,TEXTURE_BINDING_2D_ARRAY:35869,R11F_G11F_B10F:35898,UNSIGNED_INT_10F_11F_11F_REV:35899,RGB9_E5:35901,UNSIGNED_INT_5_9_9_9_REV:35902,TRANSFORM_FEEDBACK_BUFFER_MODE:35967,MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS:35968,TRANSFORM_FEEDBACK_VARYINGS:35971,TRANSFORM_FEEDBACK_BUFFER_START:35972,TRANSFORM_FEEDBACK_BUFFER_SIZE:35973,TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:35976,RASTERIZER_DISCARD:35977,MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS:35978,MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS:35979,INTERLEAVED_ATTRIBS:35980,SEPARATE_ATTRIBS:35981,TRANSFORM_FEEDBACK_BUFFER:35982,TRANSFORM_FEEDBACK_BUFFER_BINDING:35983,RGBA32UI:36208,RGB32UI:36209,RGBA16UI:36214,RGB16UI:36215,RGBA8UI:36220,RGB8UI:36221,RGBA32I:36226,RGB32I:36227,RGBA16I:36232,RGB16I:36233,RGBA8I:36238,RGB8I:36239,RED_INTEGER:36244,RGB_INTEGER:36248,RGBA_INTEGER:36249,SAMPLER_2D_ARRAY:36289,SAMPLER_2D_ARRAY_SHADOW:36292,SAMPLER_CUBE_SHADOW:36293,UNSIGNED_INT_VEC2:36294,UNSIGNED_INT_VEC3:36295,UNSIGNED_INT_VEC4:36296,INT_SAMPLER_2D:36298,INT_SAMPLER_3D:36299,INT_SAMPLER_CUBE:36300,INT_SAMPLER_2D_ARRAY:36303,UNSIGNED_INT_SAMPLER_2D:36306,UNSIGNED_INT_SAMPLER_3D:36307,UNSIGNED_INT_SAMPLER_CUBE:36308,UNSIGNED_INT_SAMPLER_2D_ARRAY:36311,DEPTH_COMPONENT32F:36012,DEPTH32F_STENCIL8:36013,FLOAT_32_UNSIGNED_INT_24_8_REV:36269,FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING:33296,FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE:33297,FRAMEBUFFER_ATTACHMENT_RED_SIZE:33298,FRAMEBUFFER_ATTACHMENT_GREEN_SIZE:33299,FRAMEBUFFER_ATTACHME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 