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94x 94x 94x 94x 92x 2x 4x 4x 1x 1x 3x 3x 3x 3x 3x 94x 1x 1x 1x 1x 1x 93x 94x 94x 94x 94x 94x 94x 94x 94x 28x 94x 35x 94x 25x 94x 94x 94x 14x 14x 14x 80x 94x 94x 1x 93x 88x 88x 29x 59x 1x 3x 69x 271x 181x 103x 2x 5x 2x 337x 1x 404x 1x 10x 9x 9x 1x 76x 75x 75x 74x 74x 74x 74x 74x 74x 69x 69x 69x 1x 68x 68x 68x 32x 36x 30x 6x 6x 6x 6x 6x 6x 1x 2x 2x 2x 2x 2x 2x 23x 2x 21x 21x 21x 21x 21x 21x 11x 11x 1x 11x 11x 11x 11x 16x 11x 1x 1x 1x 1x 1x 1x 1x 1x 11x 5x 1x | import AttributeCompression from "./AttributeCompression.js";
import BoundingSphere from "./BoundingSphere.js";
import Cartesian3 from "./Cartesian3.js";
import Check from "./Check.js";
import Credit from "./Credit.js";
import Frozen from "./Frozen.js";
import defined from "./defined.js";
import Ellipsoid from "./Ellipsoid.js";
import Event from "./Event.js";
import GeographicTilingScheme from "./GeographicTilingScheme.js";
import WebMercatorTilingScheme from "./WebMercatorTilingScheme.js";
import getJsonFromTypedArray from "./getJsonFromTypedArray.js";
import HeightmapTerrainData from "./HeightmapTerrainData.js";
import IndexDatatype from "./IndexDatatype.js";
import IonResource from "./IonResource.js";
import OrientedBoundingBox from "./OrientedBoundingBox.js";
import QuantizedMeshTerrainData from "./QuantizedMeshTerrainData.js";
import Request from "./Request.js";
import RequestType from "./RequestType.js";
import Resource from "./Resource.js";
import RuntimeError from "./RuntimeError.js";
import TerrainProvider from "./TerrainProvider.js";
import TileAvailability from "./TileAvailability.js";
import TileProviderError from "./TileProviderError.js";
function LayerInformation(layer) {
this.resource = layer.resource;
this.version = layer.version;
this.isHeightmap = layer.isHeightmap;
this.tileUrlTemplates = layer.tileUrlTemplates;
this.availability = layer.availability;
this.hasVertexNormals = layer.hasVertexNormals;
this.hasWaterMask = layer.hasWaterMask;
this.hasMetadata = layer.hasMetadata;
this.availabilityLevels = layer.availabilityLevels;
this.availabilityTilesLoaded = layer.availabilityTilesLoaded;
this.littleEndianExtensionSize = layer.littleEndianExtensionSize;
this.availabilityPromiseCache = {};
}
/**
* @typedef {object} CesiumTerrainProvider.ConstructorOptions
*
* Initialization options for the CesiumTerrainProvider constructor
*
* @property {boolean} [requestVertexNormals=false] Flag that indicates if the client should request additional lighting information from the server, in the form of per vertex normals if available.
* @property {boolean} [requestWaterMask=false] Flag that indicates if the client should request per tile water masks from the server, if available.
* @property {boolean} [requestMetadata=true] Flag that indicates if the client should request per tile metadata from the server, if available.
* @property {Ellipsoid} [ellipsoid=Ellipsoid.default] The ellipsoid. If not specified, the default ellipsoid is used.
* @property {Credit|string} [credit] A credit for the data source, which is displayed on the canvas.
*/
/**
* Used to track creation details while fetching initial metadata
*
* @constructor
* @private
*
* @param {CesiumTerrainProvider.ConstructorOptions} options An object describing initialization options
*/
function TerrainProviderBuilder(options) {
this.requestVertexNormals = options.requestVertexNormals ?? false;
this.requestWaterMask = options.requestWaterMask ?? false;
this.requestMetadata = options.requestMetadata ?? true;
this.ellipsoid = options.ellipsoid ?? Ellipsoid.default;
this.heightmapWidth = 65;
this.heightmapStructure = undefined;
this.hasWaterMask = false;
this.hasMetadata = false;
this.hasVertexNormals = false;
this.scheme = undefined;
this.lastResource = undefined;
this.layerJsonResource = undefined;
this.previousError = undefined;
this.availability = undefined;
this.tilingScheme = undefined;
this.levelZeroMaximumGeometricError = undefined;
this.heightmapStructure = undefined;
this.layers = [];
this.attribution = "";
this.overallAvailability = [];
this.overallMaxZoom = 0;
this.tileCredits = [];
}
/**
* Complete CesiumTerrainProvider creation based on builder values.
*
* @private
*
* @param {CesiumTerrainProvider} provider
*/
TerrainProviderBuilder.prototype.build = function (provider) {
provider._heightmapWidth = this.heightmapWidth;
provider._scheme = this.scheme;
// ion resources have a credits property we can use for additional attribution.
const credits = defined(this.lastResource.credits)
? this.lastResource.credits
: [];
provider._tileCredits = credits.concat(this.tileCredits);
provider._availability = this.availability;
provider._tilingScheme = this.tilingScheme;
provider._requestWaterMask = this.requestWaterMask;
provider._levelZeroMaximumGeometricError =
this.levelZeroMaximumGeometricError;
provider._heightmapStructure = this.heightmapStructure;
provider._layers = this.layers;
provider._hasWaterMask = this.hasWaterMask;
provider._hasVertexNormals = this.hasVertexNormals;
provider._hasMetadata = this.hasMetadata;
};
async function parseMetadataSuccess(terrainProviderBuilder, data, provider) {
if (!data.format) {
const message = "The tile format is not specified in the layer.json file.";
terrainProviderBuilder.previousError = TileProviderError.reportError(
terrainProviderBuilder.previousError,
provider,
defined(provider) ? provider._errorEvent : undefined,
message,
);
throw new RuntimeError(message);
}
if (!data.tiles || data.tiles.length === 0) {
const message =
"The layer.json file does not specify any tile URL templates.";
terrainProviderBuilder.previousError = TileProviderError.reportError(
terrainProviderBuilder.previousError,
provider,
defined(provider) ? provider._errorEvent : undefined,
message,
);
throw new RuntimeError(message);
}
let hasVertexNormals = false;
let hasWaterMask = false;
let hasMetadata = false;
let littleEndianExtensionSize = true;
let isHeightmap = false;
if (data.format === "heightmap-1.0") {
isHeightmap = true;
Eif (!defined(terrainProviderBuilder.heightmapStructure)) {
terrainProviderBuilder.heightmapStructure = {
heightScale: 1.0 / 5.0,
heightOffset: -1000.0,
elementsPerHeight: 1,
stride: 1,
elementMultiplier: 256.0,
isBigEndian: false,
lowestEncodedHeight: 0,
highestEncodedHeight: 256 * 256 - 1,
};
}
hasWaterMask = true;
terrainProviderBuilder.requestWaterMask = true;
} else if (data.format.indexOf("quantized-mesh-1.") !== 0) {
const message = `The tile format "${data.format}" is invalid or not supported.`;
terrainProviderBuilder.previousError = TileProviderError.reportError(
terrainProviderBuilder.previousError,
provider,
defined(provider) ? provider._errorEvent : undefined,
message,
);
throw new RuntimeError(message);
}
const tileUrlTemplates = data.tiles;
const maxZoom = data.maxzoom;
terrainProviderBuilder.overallMaxZoom = Math.max(
terrainProviderBuilder.overallMaxZoom,
maxZoom,
);
// Keeps track of which of the availability containing tiles have been loaded
if (!data.projection || data.projection === "EPSG:4326") {
terrainProviderBuilder.tilingScheme = new GeographicTilingScheme({
numberOfLevelZeroTilesX: 2,
numberOfLevelZeroTilesY: 1,
ellipsoid: terrainProviderBuilder.ellipsoid,
});
} else Eif (data.projection === "EPSG:3857") {
terrainProviderBuilder.tilingScheme = new WebMercatorTilingScheme({
numberOfLevelZeroTilesX: 1,
numberOfLevelZeroTilesY: 1,
ellipsoid: terrainProviderBuilder.ellipsoid,
});
} else {
const message = `The projection "${data.projection}" is invalid or not supported.`;
terrainProviderBuilder.previousError = TileProviderError.reportError(
terrainProviderBuilder.previousError,
provider,
defined(provider) ? provider._errorEvent : undefined,
message,
);
throw new RuntimeError(message);
}
terrainProviderBuilder.levelZeroMaximumGeometricError =
TerrainProvider.getEstimatedLevelZeroGeometricErrorForAHeightmap(
terrainProviderBuilder.tilingScheme.ellipsoid,
terrainProviderBuilder.heightmapWidth,
terrainProviderBuilder.tilingScheme.getNumberOfXTilesAtLevel(0),
);
if (!data.scheme || data.scheme === "tms" || data.scheme === "slippyMap") {
terrainProviderBuilder.scheme = data.scheme;
} else E{
const message = `The scheme "${data.scheme}" is invalid or not supported.`;
terrainProviderBuilder.previousError = TileProviderError.reportError(
terrainProviderBuilder.previousError,
provider,
defined(provider) ? provider._errorEvent : undefined,
message,
);
throw new RuntimeError(message);
}
let availabilityTilesLoaded;
// The vertex normals defined in the 'octvertexnormals' extension is identical to the original
// contents of the original 'vertexnormals' extension. 'vertexnormals' extension is now
// deprecated, as the extensionLength for this extension was incorrectly using big endian.
// We maintain backwards compatibility with the legacy 'vertexnormal' implementation
// by setting the _littleEndianExtensionSize to false. Always prefer 'octvertexnormals'
// over 'vertexnormals' if both extensions are supported by the server.
if (
defined(data.extensions) &&
data.extensions.indexOf("octvertexnormals") !== -1
) {
hasVertexNormals = true;
} else if (
defined(data.extensions) &&
data.extensions.indexOf("vertexnormals") !== -1
) {
hasVertexNormals = true;
littleEndianExtensionSize = false;
}
if (defined(data.extensions) && data.extensions.indexOf("watermask") !== -1) {
hasWaterMask = true;
}
if (defined(data.extensions) && data.extensions.indexOf("metadata") !== -1) {
hasMetadata = true;
}
const availabilityLevels = data.metadataAvailability;
const availableTiles = data.available;
let availability;
if (defined(availableTiles) && !defined(availabilityLevels)) {
availability = new TileAvailability(
terrainProviderBuilder.tilingScheme,
availableTiles.length,
);
for (let level = 0; level < availableTiles.length; ++level) {
const rangesAtLevel = availableTiles[level];
const yTiles =
terrainProviderBuilder.tilingScheme.getNumberOfYTilesAtLevel(level);
if (!defined(terrainProviderBuilder.overallAvailability[level])) {
terrainProviderBuilder.overallAvailability[level] = [];
}
for (
let rangeIndex = 0;
rangeIndex < rangesAtLevel.length;
++rangeIndex
) {
const range = rangesAtLevel[rangeIndex];
const yStart = yTiles - range.endY - 1;
const yEnd = yTiles - range.startY - 1;
terrainProviderBuilder.overallAvailability[level].push([
range.startX,
yStart,
range.endX,
yEnd,
]);
availability.addAvailableTileRange(
level,
range.startX,
yStart,
range.endX,
yEnd,
);
}
}
} else if (defined(availabilityLevels)) {
availabilityTilesLoaded = new TileAvailability(
terrainProviderBuilder.tilingScheme,
maxZoom,
);
availability = new TileAvailability(
terrainProviderBuilder.tilingScheme,
maxZoom,
);
terrainProviderBuilder.overallAvailability[0] = [[0, 0, 1, 0]];
availability.addAvailableTileRange(0, 0, 0, 1, 0);
}
terrainProviderBuilder.hasWaterMask =
terrainProviderBuilder.hasWaterMask || hasWaterMask;
terrainProviderBuilder.hasVertexNormals =
terrainProviderBuilder.hasVertexNormals || hasVertexNormals;
terrainProviderBuilder.hasMetadata =
terrainProviderBuilder.hasMetadata || hasMetadata;
if (defined(data.attribution)) {
if (terrainProviderBuilder.attribution.length > 0) {
terrainProviderBuilder.attribution += " ";
}
terrainProviderBuilder.attribution += data.attribution;
}
terrainProviderBuilder.layers.push(
new LayerInformation({
resource: terrainProviderBuilder.lastResource,
version: data.version,
isHeightmap: isHeightmap,
tileUrlTemplates: tileUrlTemplates,
availability: availability,
hasVertexNormals: hasVertexNormals,
hasWaterMask: hasWaterMask,
hasMetadata: hasMetadata,
availabilityLevels: availabilityLevels,
availabilityTilesLoaded: availabilityTilesLoaded,
littleEndianExtensionSize: littleEndianExtensionSize,
}),
);
const parentUrl = data.parentUrl;
if (defined(parentUrl)) {
Iif (!defined(availability)) {
console.log(
"A layer.json can't have a parentUrl if it does't have an available array.",
);
return true;
}
terrainProviderBuilder.lastResource =
terrainProviderBuilder.lastResource.getDerivedResource({
url: parentUrl,
});
terrainProviderBuilder.lastResource.appendForwardSlash(); // Terrain always expects a directory
terrainProviderBuilder.layerJsonResource =
terrainProviderBuilder.lastResource.getDerivedResource({
url: "layer.json",
});
await requestLayerJson(terrainProviderBuilder);
return true;
}
return true;
}
function parseMetadataFailure(terrainProviderBuilder, error, provider) {
let message = `An error occurred while accessing ${terrainProviderBuilder.layerJsonResource.url}.`;
if (defined(error)) {
message += `\n${error.message}`;
}
terrainProviderBuilder.previousError = TileProviderError.reportError(
terrainProviderBuilder.previousError,
provider,
defined(provider) ? provider._errorEvent : undefined,
message,
);
// If we can retry, do so. Otherwise throw the error.
if (terrainProviderBuilder.previousError.retry) {
return requestLayerJson(terrainProviderBuilder, provider);
}
throw new RuntimeError(message);
}
async function metadataSuccess(terrainProviderBuilder, data, provider) {
await parseMetadataSuccess(terrainProviderBuilder, data, provider);
const length = terrainProviderBuilder.overallAvailability.length;
if (length > 0) {
const availability = (terrainProviderBuilder.availability =
new TileAvailability(
terrainProviderBuilder.tilingScheme,
terrainProviderBuilder.overallMaxZoom,
));
for (let level = 0; level < length; ++level) {
const levelRanges = terrainProviderBuilder.overallAvailability[level];
for (let i = 0; i < levelRanges.length; ++i) {
const range = levelRanges[i];
availability.addAvailableTileRange(
level,
range[0],
range[1],
range[2],
range[3],
);
}
}
}
if (terrainProviderBuilder.attribution.length > 0) {
const layerJsonCredit = new Credit(terrainProviderBuilder.attribution);
terrainProviderBuilder.tileCredits.push(layerJsonCredit);
}
return true;
}
async function requestLayerJson(terrainProviderBuilder, provider) {
try {
const data = await terrainProviderBuilder.layerJsonResource.fetchJson();
return metadataSuccess(terrainProviderBuilder, data, provider);
} catch (error) {
// If the metadata is not found, assume this is a pre-metadata heightmap tileset.
if (defined(error) && error.statusCode === 404) {
await parseMetadataSuccess(
terrainProviderBuilder,
{
tilejson: "2.1.0",
format: "heightmap-1.0",
version: "1.0.0",
scheme: "tms",
tiles: ["{z}/{x}/{y}.terrain?v={version}"],
},
provider,
);
return true;
}
return parseMetadataFailure(terrainProviderBuilder, error, provider);
}
}
/**
* <div class="notice">
* To construct a CesiumTerrainProvider, call {@link CesiumTerrainProvider.fromIonAssetId} or {@link CesiumTerrainProvider.fromUrl}. Do not call the constructor directly.
* </div>
*
* A {@link TerrainProvider} that accesses terrain data in a Cesium terrain format.
* Terrain formats can be one of the following:
* <ul>
* <li> {@link https://github.com/AnalyticalGraphicsInc/quantized-mesh Quantized Mesh} </li>
* <li> {@link https://github.com/AnalyticalGraphicsInc/cesium/wiki/heightmap-1.0 Height Map} </li>
* </ul>
*
* @alias CesiumTerrainProvider
* @constructor
*
* @param {CesiumTerrainProvider.ConstructorOptions} [options] An object describing initialization options
*
* @example
* // Create Arctic DEM terrain with normals.
* try {
* const viewer = new Cesium.Viewer("cesiumContainer", {
* terrainProvider: await Cesium.CesiumTerrainProvider.fromIonAssetId(3956, {
* requestVertexNormals: true
* })
* });
* } catch (error) {
* console.log(error);
* }
*
* @see createWorldTerrain
* @see CesiumTerrainProvider.fromUrl
* @see CesiumTerrainProvider.fromIonAssetId
* @see TerrainProvider
*/
function CesiumTerrainProvider(options) {
options = options ?? Frozen.EMPTY_OBJECT;
this._heightmapWidth = undefined;
this._heightmapStructure = undefined;
this._hasWaterMask = false;
this._hasVertexNormals = false;
this._hasMetadata = false;
this._scheme = undefined;
this._ellipsoid = options.ellipsoid;
/**
* Boolean flag that indicates if the client should request vertex normals from the server.
* @type {boolean}
* @default false
* @private
*/
this._requestVertexNormals = options.requestVertexNormals ?? false;
/**
* Boolean flag that indicates if the client should request tile watermasks from the server.
* @type {boolean}
* @default false
* @private
*/
this._requestWaterMask = options.requestWaterMask ?? false;
/**
* Boolean flag that indicates if the client should request tile metadata from the server.
* @type {boolean}
* @default true
* @private
*/
this._requestMetadata = options.requestMetadata ?? true;
this._errorEvent = new Event();
let credit = options.credit;
if (typeof credit === "string") {
credit = new Credit(credit);
}
this._credit = credit;
this._availability = undefined;
this._tilingScheme = undefined;
this._levelZeroMaximumGeometricError = undefined;
this._layers = undefined;
this._tileCredits = undefined;
}
/**
* When using the Quantized-Mesh format, a tile may be returned that includes additional extensions, such as PerVertexNormals, watermask, etc.
* This enumeration defines the unique identifiers for each type of extension data that has been appended to the standard mesh data.
*
* @namespace QuantizedMeshExtensionIds
* @see CesiumTerrainProvider
* @private
*/
const QuantizedMeshExtensionIds = {
/**
* Oct-Encoded Per-Vertex Normals are included as an extension to the tile mesh
*
* @type {number}
* @constant
* @default 1
*/
OCT_VERTEX_NORMALS: 1,
/**
* A watermask is included as an extension to the tile mesh
*
* @type {number}
* @constant
* @default 2
*/
WATER_MASK: 2,
/**
* A json object contain metadata about the tile
*
* @type {number}
* @constant
* @default 4
*/
METADATA: 4,
};
function getRequestHeader(extensionsList) {
if (!defined(extensionsList) || extensionsList.length === 0) {
return {
Accept:
"application/vnd.quantized-mesh,application/octet-stream;q=0.9,*/*;q=0.01",
};
}
const extensions = extensionsList.join("-");
return {
Accept: `application/vnd.quantized-mesh;extensions=${extensions},application/octet-stream;q=0.9,*/*;q=0.01`,
};
}
function createHeightmapTerrainData(provider, buffer, level, x, y) {
const heightBuffer = new Uint16Array(
buffer,
0,
provider._heightmapWidth * provider._heightmapWidth,
);
return new HeightmapTerrainData({
buffer: heightBuffer,
childTileMask: new Uint8Array(buffer, heightBuffer.byteLength, 1)[0],
waterMask: new Uint8Array(
buffer,
heightBuffer.byteLength + 1,
buffer.byteLength - heightBuffer.byteLength - 1,
),
width: provider._heightmapWidth,
height: provider._heightmapWidth,
structure: provider._heightmapStructure,
credits: provider._tileCredits,
});
}
function createQuantizedMeshTerrainData(provider, buffer, level, x, y, layer) {
const littleEndianExtensionSize = layer.littleEndianExtensionSize;
let pos = 0;
const cartesian3Elements = 3;
const boundingSphereElements = cartesian3Elements + 1;
const cartesian3Length = Float64Array.BYTES_PER_ELEMENT * cartesian3Elements;
const boundingSphereLength =
Float64Array.BYTES_PER_ELEMENT * boundingSphereElements;
const encodedVertexElements = 3;
const encodedVertexLength =
Uint16Array.BYTES_PER_ELEMENT * encodedVertexElements;
const triangleElements = 3;
let bytesPerIndex = Uint16Array.BYTES_PER_ELEMENT;
let triangleLength = bytesPerIndex * triangleElements;
const view = new DataView(buffer);
const center = new Cartesian3(
view.getFloat64(pos, true),
view.getFloat64(pos + 8, true),
view.getFloat64(pos + 16, true),
);
pos += cartesian3Length;
const minimumHeight = view.getFloat32(pos, true);
pos += Float32Array.BYTES_PER_ELEMENT;
const maximumHeight = view.getFloat32(pos, true);
pos += Float32Array.BYTES_PER_ELEMENT;
const boundingSphere = new BoundingSphere(
new Cartesian3(
view.getFloat64(pos, true),
view.getFloat64(pos + 8, true),
view.getFloat64(pos + 16, true),
),
view.getFloat64(pos + cartesian3Length, true),
);
pos += boundingSphereLength;
const horizonOcclusionPoint = new Cartesian3(
view.getFloat64(pos, true),
view.getFloat64(pos + 8, true),
view.getFloat64(pos + 16, true),
);
pos += cartesian3Length;
const vertexCount = view.getUint32(pos, true);
pos += Uint32Array.BYTES_PER_ELEMENT;
const encodedVertexBuffer = new Uint16Array(buffer, pos, vertexCount * 3);
pos += vertexCount * encodedVertexLength;
if (vertexCount > 64 * 1024) {
// More than 64k vertices, so indices are 32-bit.
bytesPerIndex = Uint32Array.BYTES_PER_ELEMENT;
triangleLength = bytesPerIndex * triangleElements;
}
// Decode the vertex buffer.
const uBuffer = encodedVertexBuffer.subarray(0, vertexCount);
const vBuffer = encodedVertexBuffer.subarray(vertexCount, 2 * vertexCount);
const heightBuffer = encodedVertexBuffer.subarray(
vertexCount * 2,
3 * vertexCount,
);
AttributeCompression.zigZagDeltaDecode(uBuffer, vBuffer, heightBuffer);
// skip over any additional padding that was added for 2/4 byte alignment
Iif (pos % bytesPerIndex !== 0) {
pos += bytesPerIndex - (pos % bytesPerIndex);
}
const triangleCount = view.getUint32(pos, true);
pos += Uint32Array.BYTES_PER_ELEMENT;
const indices = IndexDatatype.createTypedArrayFromArrayBuffer(
vertexCount,
buffer,
pos,
triangleCount * triangleElements,
);
pos += triangleCount * triangleLength;
// High water mark decoding based on decompressIndices_ in webgl-loader's loader.js.
// https://code.google.com/p/webgl-loader/source/browse/trunk/samples/loader.js?r=99#55
// Copyright 2012 Google Inc., Apache 2.0 license.
let highest = 0;
const length = indices.length;
for (let i = 0; i < length; ++i) {
const code = indices[i];
indices[i] = highest - code;
if (code === 0) {
++highest;
}
}
const westVertexCount = view.getUint32(pos, true);
pos += Uint32Array.BYTES_PER_ELEMENT;
const westIndices = IndexDatatype.createTypedArrayFromArrayBuffer(
vertexCount,
buffer,
pos,
westVertexCount,
);
pos += westVertexCount * bytesPerIndex;
const southVertexCount = view.getUint32(pos, true);
pos += Uint32Array.BYTES_PER_ELEMENT;
const southIndices = IndexDatatype.createTypedArrayFromArrayBuffer(
vertexCount,
buffer,
pos,
southVertexCount,
);
pos += southVertexCount * bytesPerIndex;
const eastVertexCount = view.getUint32(pos, true);
pos += Uint32Array.BYTES_PER_ELEMENT;
const eastIndices = IndexDatatype.createTypedArrayFromArrayBuffer(
vertexCount,
buffer,
pos,
eastVertexCount,
);
pos += eastVertexCount * bytesPerIndex;
const northVertexCount = view.getUint32(pos, true);
pos += Uint32Array.BYTES_PER_ELEMENT;
const northIndices = IndexDatatype.createTypedArrayFromArrayBuffer(
vertexCount,
buffer,
pos,
northVertexCount,
);
pos += northVertexCount * bytesPerIndex;
let encodedNormalBuffer;
let waterMaskBuffer;
while (pos < view.byteLength) {
const extensionId = view.getUint8(pos, true);
pos += Uint8Array.BYTES_PER_ELEMENT;
const extensionLength = view.getUint32(pos, littleEndianExtensionSize);
pos += Uint32Array.BYTES_PER_ELEMENT;
if (
extensionId === QuantizedMeshExtensionIds.OCT_VERTEX_NORMALS &&
provider._requestVertexNormals
) {
encodedNormalBuffer = new Uint8Array(buffer, pos, vertexCount * 2);
} else if (
extensionId === QuantizedMeshExtensionIds.WATER_MASK &&
provider._requestWaterMask
) {
waterMaskBuffer = new Uint8Array(buffer, pos, extensionLength);
} else if (
extensionId === QuantizedMeshExtensionIds.METADATA &&
provider._requestMetadata
) {
const stringLength = view.getUint32(pos, true);
Eif (stringLength > 0) {
const metadata = getJsonFromTypedArray(
new Uint8Array(buffer),
pos + Uint32Array.BYTES_PER_ELEMENT,
stringLength,
);
const availableTiles = metadata.available;
if (defined(availableTiles)) {
for (let offset = 0; offset < availableTiles.length; ++offset) {
const availableLevel = level + offset + 1;
const rangesAtLevel = availableTiles[offset];
const yTiles =
provider._tilingScheme.getNumberOfYTilesAtLevel(availableLevel);
for (
let rangeIndex = 0;
rangeIndex < rangesAtLevel.length;
++rangeIndex
) {
const range = rangesAtLevel[rangeIndex];
const yStart = yTiles - range.endY - 1;
const yEnd = yTiles - range.startY - 1;
provider.availability.addAvailableTileRange(
availableLevel,
range.startX,
yStart,
range.endX,
yEnd,
);
layer.availability.addAvailableTileRange(
availableLevel,
range.startX,
yStart,
range.endX,
yEnd,
);
}
}
}
}
layer.availabilityTilesLoaded.addAvailableTileRange(level, x, y, x, y);
}
pos += extensionLength;
}
const skirtHeight = provider.getLevelMaximumGeometricError(level) * 5.0;
// The skirt is not included in the OBB computation. If this ever
// causes any rendering artifacts (cracks), they are expected to be
// minor and in the corners of the screen. It's possible that this
// might need to be changed - just change to `minimumHeight - skirtHeight`
// A similar change might also be needed in `upsampleQuantizedTerrainMesh.js`.
const rectangle = provider._tilingScheme.tileXYToRectangle(x, y, level);
const orientedBoundingBox = OrientedBoundingBox.fromRectangle(
rectangle,
minimumHeight,
maximumHeight,
provider._tilingScheme.ellipsoid,
);
return new QuantizedMeshTerrainData({
center: center,
minimumHeight: minimumHeight,
maximumHeight: maximumHeight,
boundingSphere: boundingSphere,
orientedBoundingBox: orientedBoundingBox,
horizonOcclusionPoint: horizonOcclusionPoint,
quantizedVertices: encodedVertexBuffer,
encodedNormals: encodedNormalBuffer,
indices: indices,
westIndices: westIndices,
southIndices: southIndices,
eastIndices: eastIndices,
northIndices: northIndices,
westSkirtHeight: skirtHeight,
southSkirtHeight: skirtHeight,
eastSkirtHeight: skirtHeight,
northSkirtHeight: skirtHeight,
childTileMask: provider.availability.computeChildMaskForTile(level, x, y),
waterMask: waterMaskBuffer,
credits: provider._tileCredits,
});
}
/**
* Requests the geometry for a given tile. The result must include terrain data and
* may optionally include a water mask and an indication of which child tiles are available.
*
* @param {number} x The X coordinate of the tile for which to request geometry.
* @param {number} y The Y coordinate of the tile for which to request geometry.
* @param {number} level The level of the tile for which to request geometry.
* @param {Request} [request] The request object. Intended for internal use only.
*
* @returns {Promise<TerrainData>|undefined} A promise for the requested geometry. If this method
* returns undefined instead of a promise, it is an indication that too many requests are already
* pending and the request will be retried later.
*
*/
CesiumTerrainProvider.prototype.requestTileGeometry = function (
x,
y,
level,
request,
) {
const layers = this._layers;
let layerToUse;
const layerCount = layers.length;
let unknownAvailability = false;
let availabilityPromise = Promise.resolve();
if (layerCount === 1) {
// Optimized path for single layers
layerToUse = layers[0];
} else {
for (let i = 0; i < layerCount; ++i) {
const layer = layers[i];
if (
!defined(layer.availability) ||
layer.availability.isTileAvailable(level, x, y)
) {
layerToUse = layer;
break;
}
const availabilityUnloaded = checkLayer(
this,
x,
y,
level,
layer,
i === 0,
);
Eif (availabilityUnloaded.result) {
// We can't know yet since the availability is not yet loaded
unknownAvailability = true;
availabilityPromise = availabilityPromise.then(
() => availabilityUnloaded.promise,
);
}
}
}
if (!defined(layerToUse) && unknownAvailability) {
// Try again when availability data is ready– Otherwise the tile will be marked as failed and never re-requested
return availabilityPromise.then(() => {
// handle promise or undefined return
return new Promise((resolve) => {
// defer execution to the next event loop
setTimeout(() => {
const promise = this.requestTileGeometry(x, y, level, request);
resolve(promise);
}, 0); // next tick
});
});
}
// call overridden function below
return requestTileGeometry(this, x, y, level, layerToUse, request);
};
function requestTileGeometry(provider, x, y, level, layerToUse, request) {
Iif (!defined(layerToUse)) {
return Promise.reject(new RuntimeError("Terrain tile doesn't exist"));
}
const urlTemplates = layerToUse.tileUrlTemplates;
Iif (urlTemplates.length === 0) {
return undefined;
}
// The TileMapService scheme counts from the bottom left
let terrainY;
if (!provider._scheme || provider._scheme === "tms") {
const yTiles = provider._tilingScheme.getNumberOfYTilesAtLevel(level);
terrainY = yTiles - y - 1;
} else E{
terrainY = y;
}
const extensionList = [];
if (provider._requestVertexNormals && layerToUse.hasVertexNormals) {
extensionList.push(
layerToUse.littleEndianExtensionSize
? "octvertexnormals"
: "vertexnormals",
);
}
if (provider._requestWaterMask && layerToUse.hasWaterMask) {
extensionList.push("watermask");
}
if (provider._requestMetadata && layerToUse.hasMetadata) {
extensionList.push("metadata");
}
let headers;
let query;
const url = urlTemplates[(x + terrainY + level) % urlTemplates.length];
const resource = layerToUse.resource;
if (
defined(resource._ionEndpoint) &&
!defined(resource._ionEndpoint.externalType)
) {
// ion uses query parameters to request extensions
Eif (extensionList.length !== 0) {
query = { extensions: extensionList.join("-") };
}
headers = getRequestHeader(undefined);
} else {
//All other terrain servers
headers = getRequestHeader(extensionList);
}
const promise = resource
.getDerivedResource({
url: url,
templateValues: {
version: layerToUse.version,
z: level,
x: x,
y: terrainY,
},
queryParameters: query,
headers: headers,
request: request,
})
.fetchArrayBuffer();
if (!defined(promise)) {
return undefined;
}
return promise.then(function (buffer) {
Iif (!defined(buffer)) {
return Promise.reject(new RuntimeError("Mesh buffer doesn't exist."));
}
if (defined(provider._heightmapStructure)) {
return createHeightmapTerrainData(provider, buffer, level, x, y);
}
return createQuantizedMeshTerrainData(
provider,
buffer,
level,
x,
y,
layerToUse,
);
});
}
Object.defineProperties(CesiumTerrainProvider.prototype, {
/**
* Gets an event that is raised when the terrain provider encounters an asynchronous error. By subscribing
* to the event, you will be notified of the error and can potentially recover from it. Event listeners
* are passed an instance of {@link TileProviderError}.
* @memberof CesiumTerrainProvider.prototype
* @type {Event}
* @readonly
*/
errorEvent: {
get: function () {
return this._errorEvent;
},
},
/**
* Gets the credit to display when this terrain provider is active. Typically this is used to credit
* the source of the terrain.
* @memberof CesiumTerrainProvider.prototype
* @type {Credit}
* @readonly
*/
credit: {
get: function () {
return this._credit;
},
},
/**
* Gets the tiling scheme used by this provider.
* @memberof CesiumTerrainProvider.prototype
* @type {GeographicTilingScheme}
* @readonly
*/
tilingScheme: {
get: function () {
return this._tilingScheme;
},
},
/**
* Gets a value indicating whether or not the provider includes a water mask. The water mask
* indicates which areas of the globe are water rather than land, so they can be rendered
* as a reflective surface with animated waves.
* @memberof CesiumTerrainProvider.prototype
* @type {boolean}
* @readonly
*/
hasWaterMask: {
get: function () {
return this._hasWaterMask && this._requestWaterMask;
},
},
/**
* Gets a value indicating whether or not the requested tiles include vertex normals.
* @memberof CesiumTerrainProvider.prototype
* @type {boolean}
* @readonly
*/
hasVertexNormals: {
get: function () {
// returns true if we can request vertex normals from the server
return this._hasVertexNormals && this._requestVertexNormals;
},
},
/**
* Gets a value indicating whether or not the requested tiles include metadata.
* @memberof CesiumTerrainProvider.prototype
* @type {boolean}
* @readonly
*/
hasMetadata: {
get: function () {
// returns true if we can request metadata from the server
return this._hasMetadata && this._requestMetadata;
},
},
/**
* Boolean flag that indicates if the client should request vertex normals from the server.
* Vertex normals data is appended to the standard tile mesh data only if the client requests the vertex normals and
* if the server provides vertex normals.
* @memberof CesiumTerrainProvider.prototype
* @type {boolean}
* @readonly
*/
requestVertexNormals: {
get: function () {
return this._requestVertexNormals;
},
},
/**
* Boolean flag that indicates if the client should request a watermask from the server.
* Watermask data is appended to the standard tile mesh data only if the client requests the watermask and
* if the server provides a watermask.
* @memberof CesiumTerrainProvider.prototype
* @type {boolean}
* @readonly
*/
requestWaterMask: {
get: function () {
return this._requestWaterMask;
},
},
/**
* Boolean flag that indicates if the client should request metadata from the server.
* Metadata is appended to the standard tile mesh data only if the client requests the metadata and
* if the server provides a metadata.
* @memberof CesiumTerrainProvider.prototype
* @type {boolean}
* @readonly
*/
requestMetadata: {
get: function () {
return this._requestMetadata;
},
},
/**
* Gets an object that can be used to determine availability of terrain from this provider, such as
* at points and in rectangles. This property may be undefined if availability
* information is not available. Note that this reflects tiles that are known to be available currently.
* Additional tiles may be discovered to be available in the future, e.g. if availability information
* exists deeper in the tree rather than it all being discoverable at the root. However, a tile that
* is available now will not become unavailable in the future.
* @memberof CesiumTerrainProvider.prototype
* @type {TileAvailability|undefined}
* @readonly
*/
availability: {
get: function () {
return this._availability;
},
},
});
/**
* Gets the maximum geometric error allowed in a tile at a given level.
*
* @param {number} level The tile level for which to get the maximum geometric error.
* @returns {number} The maximum geometric error.
*/
CesiumTerrainProvider.prototype.getLevelMaximumGeometricError = function (
level,
) {
return this._levelZeroMaximumGeometricError / (1 << level);
};
/**
* Creates a {@link TerrainProvider} from a Cesium ion asset ID that accesses terrain data in a Cesium terrain format
* Terrain formats can be one of the following:
* <ul>
* <li> {@link https://github.com/AnalyticalGraphicsInc/quantized-mesh Quantized Mesh} </li>
* <li> {@link https://github.com/AnalyticalGraphicsInc/cesium/wiki/heightmap-1.0 Height Map} </li>
* </ul>
*
* @param {number} assetId The Cesium ion asset id.
* @param {CesiumTerrainProvider.ConstructorOptions} [options] An object describing initialization options.
* @returns {Promise<CesiumTerrainProvider>}
*
* @example
* // Create Arctic DEM terrain with normals.
* try {
* const viewer = new Cesium.Viewer("cesiumContainer", {
* terrainProvider: await Cesium.CesiumTerrainProvider.fromIonAssetId(3956, {
* requestVertexNormals: true
* })
* });
* } catch (error) {
* console.log(error);
* }
*
* @exception {RuntimeError} layer.json does not specify a format
* @exception {RuntimeError} layer.json specifies an unknown format
* @exception {RuntimeError} layer.json specifies an unsupported quantized-mesh version
* @exception {RuntimeError} layer.json does not specify a tiles property, or specifies an empty array
* @exception {RuntimeError} layer.json does not specify any tile URL templates
*/
CesiumTerrainProvider.fromIonAssetId = async function (assetId, options) {
//>>includeStart('debug', pragmas.debug);
Check.defined("assetId", assetId);
//>>includeEnd('debug');
const resource = await IonResource.fromAssetId(assetId);
return CesiumTerrainProvider.fromUrl(resource, options);
};
/**
* Creates a {@link TerrainProvider} that accesses terrain data in a Cesium terrain format.
* Terrain formats can be one of the following:
* <ul>
* <li> {@link https://github.com/AnalyticalGraphicsInc/quantized-mesh Quantized Mesh} </li>
* <li> {@link https://github.com/AnalyticalGraphicsInc/cesium/wiki/heightmap-1.0 Height Map} </li>
* </ul>
*
* @param {Resource|string|Promise<Resource>|Promise<string>} url The URL of the Cesium terrain server.
* @param {CesiumTerrainProvider.ConstructorOptions} [options] An object describing initialization options.
* @returns {Promise<CesiumTerrainProvider>}
*
* @example
* // Create Arctic DEM terrain with normals.
* try {
* const viewer = new Cesium.Viewer("cesiumContainer", {
* terrainProvider: await Cesium.CesiumTerrainProvider.fromUrl(
* Cesium.IonResource.fromAssetId(3956), {
* requestVertexNormals: true
* })
* });
* } catch (error) {
* console.log(error);
* }
*
* @exception {RuntimeError} layer.json does not specify a format
* @exception {RuntimeError} layer.json specifies an unknown format
* @exception {RuntimeError} layer.json specifies an unsupported quantized-mesh version
* @exception {RuntimeError} layer.json does not specify a tiles property, or specifies an empty array
* @exception {RuntimeError} layer.json does not specify any tile URL templates
*/
CesiumTerrainProvider.fromUrl = async function (url, options) {
//>>includeStart('debug', pragmas.debug);
Check.defined("url", url);
//>>includeEnd('debug');
options = options ?? Frozen.EMPTY_OBJECT;
url = await Promise.resolve(url);
const resource = Resource.createIfNeeded(url);
resource.appendForwardSlash();
const terrainProviderBuilder = new TerrainProviderBuilder(options);
terrainProviderBuilder.lastResource = resource;
terrainProviderBuilder.layerJsonResource =
terrainProviderBuilder.lastResource.getDerivedResource({
url: "layer.json",
});
await requestLayerJson(terrainProviderBuilder);
const provider = new CesiumTerrainProvider(options);
terrainProviderBuilder.build(provider);
return provider;
};
/**
* Determines whether data for a tile is available to be loaded.
*
* @param {number} x The X coordinate of the tile for which to request geometry.
* @param {number} y The Y coordinate of the tile for which to request geometry.
* @param {number} level The level of the tile for which to request geometry.
* @returns {boolean|undefined} Undefined if not supported or availability is unknown, otherwise true or false.
*/
CesiumTerrainProvider.prototype.getTileDataAvailable = function (x, y, level) {
Iif (!defined(this._availability)) {
return undefined;
}
Iif (level > this._availability._maximumLevel) {
return false;
}
if (this._availability.isTileAvailable(level, x, y)) {
// If the tile is listed as available, then we are done
return true;
}
if (!this._hasMetadata) {
// If we don't have any layers with the metadata extension then we don't have this tile
return false;
}
const layers = this._layers;
const count = layers.length;
for (let i = 0; i < count; ++i) {
const layerResult = checkLayer(this, x, y, level, layers[i], i === 0);
Eif (layerResult.result) {
// There is a layer that may or may not have the tile
return undefined;
}
}
return false;
};
/**
* Makes sure we load availability data for a tile
*
* @param {number} x The X coordinate of the tile for which to request geometry.
* @param {number} y The Y coordinate of the tile for which to request geometry.
* @param {number} level The level of the tile for which to request geometry.
* @returns {undefined|Promise<void>} Undefined if nothing need to be loaded or a Promise that resolves when all required tiles are loaded
*/
CesiumTerrainProvider.prototype.loadTileDataAvailability = function (
x,
y,
level,
) {
Iif (
!defined(this._availability) ||
level > this._availability._maximumLevel ||
this._availability.isTileAvailable(level, x, y) ||
!this._hasMetadata
) {
// We know the tile is either available or not available so nothing to wait on
return undefined;
}
const layers = this._layers;
const count = layers.length;
for (let i = 0; i < count; ++i) {
const layerResult = checkLayer(this, x, y, level, layers[i], i === 0);
Iif (defined(layerResult.promise)) {
return layerResult.promise;
}
}
};
function getAvailabilityTile(layer, x, y, level) {
if (level === 0) {
return;
}
const availabilityLevels = layer.availabilityLevels;
const parentLevel =
level % availabilityLevels === 0
? level - availabilityLevels
: ((level / availabilityLevels) | 0) * availabilityLevels;
const divisor = 1 << (level - parentLevel);
const parentX = (x / divisor) | 0;
const parentY = (y / divisor) | 0;
return {
level: parentLevel,
x: parentX,
y: parentY,
};
}
function checkLayer(provider, x, y, level, layer, topLayer) {
Iif (!defined(layer.availabilityLevels)) {
// It's definitely not in this layer
return {
result: false,
};
}
let cacheKey;
const deleteFromCache = function () {
delete layer.availabilityPromiseCache[cacheKey];
};
const availabilityTilesLoaded = layer.availabilityTilesLoaded;
const availability = layer.availability;
let tile = getAvailabilityTile(layer, x, y, level);
while (defined(tile)) {
if (
availability.isTileAvailable(tile.level, tile.x, tile.y) &&
!availabilityTilesLoaded.isTileAvailable(tile.level, tile.x, tile.y)
) {
let requestPromise;
if (!topLayer) {
cacheKey = `${tile.level}-${tile.x}-${tile.y}`;
requestPromise = layer.availabilityPromiseCache[cacheKey];
Eif (!defined(requestPromise)) {
// For cutout terrain, if this isn't the top layer the availability tiles
// may never get loaded, so request it here.
const request = new Request({
throttle: false,
throttleByServer: true,
type: RequestType.TERRAIN,
});
requestPromise = requestTileGeometry(
provider,
tile.x,
tile.y,
tile.level,
layer,
request,
);
Eif (defined(requestPromise)) {
layer.availabilityPromiseCache[cacheKey] = requestPromise;
requestPromise.then(deleteFromCache);
}
}
}
// The availability tile is available, but not loaded, so there
// is still a chance that it may become available at some point
return {
result: true,
promise: requestPromise,
};
}
tile = getAvailabilityTile(layer, tile.x, tile.y, tile.level);
}
return {
result: false,
};
}
// Used for testing
CesiumTerrainProvider._getAvailabilityTile = getAvailabilityTile;
export default CesiumTerrainProvider;
|