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import defined from "../Core/defined.js";
import destroyObject from "../Core/destroyObject.js";
import DeveloperError from "../Core/DeveloperError.js";
import Request from "../Core/Request.js";
import RequestScheduler from "../Core/RequestScheduler.js";
import RequestState from "../Core/RequestState.js";
import RequestType from "../Core/RequestType.js";
import Cesium3DContentGroup from "./Cesium3DContentGroup.js";
import Cesium3DTileContentType from "./Cesium3DTileContentType.js";
import Cesium3DTileContentFactory from "./Cesium3DTileContentFactory.js";
import findContentMetadata from "./findContentMetadata.js";
import findGroupMetadata from "./findGroupMetadata.js";
import preprocess3DTileContent from "./preprocess3DTileContent.js";
/**
* A collection of contents for tiles that have multiple contents, either via the tile JSON (3D Tiles 1.1) or the <code>3DTILES_multiple_contents</code> extension.
* <p>
* Implements the {@link Cesium3DTileContent} interface.
* </p>
*
* @see {@link https://github.com/CesiumGS/3d-tiles/tree/main/extensions/3DTILES_multiple_contents|3DTILES_multiple_contents extension}
*
* @alias Multiple3DTileContent
* @constructor
*
* @param {Cesium3DTileset} tileset The tileset this content belongs to
* @param {Cesium3DTile} tile The content this content belongs to
* @param {Resource} tilesetResource The resource that points to the tileset. This will be used to derive each inner content's resource.
* @param {object} contentsJson Either the tile JSON containing the contents array (3D Tiles 1.1), or <code>3DTILES_multiple_contents</code> extension JSON
*
* @private
* @experimental This feature is using part of the 3D Tiles spec that is not final and is subject to change without Cesium's standard deprecation policy.
*/
function Multiple3DTileContent(tileset, tile, tilesetResource, contentsJson) {
this._tileset = tileset;
this._tile = tile;
this._tilesetResource = tilesetResource;
this._contents = [];
this._contentsCreated = false;
// An older version of 3DTILES_multiple_contents used "content" instead of "contents"
const contentHeaders = defined(contentsJson.contents)
? contentsJson.contents
: contentsJson.content;
this._innerContentHeaders = contentHeaders;
this._requestsInFlight = 0;
// How many times cancelPendingRequests() has been called. This is
// used to help short-circuit computations after a tile was canceled.
this._cancelCount = 0;
// The number of contents that turned out to be external tilesets
// in createInnerContent. When all contents are external tilesets,
// then tile.hasRenderableContent will become `false`
this._externalTilesetCount = 0;
const contentCount = this._innerContentHeaders.length;
this._arrayFetchPromises = new Array(contentCount);
this._requests = new Array(contentCount);
this._ready = false;
this._innerContentResources = new Array(contentCount);
this._serverKeys = new Array(contentCount);
for (let i = 0; i < contentCount; i++) {
const contentResource = tilesetResource.getDerivedResource({
url: contentHeaders[i].uri,
});
const serverKey = RequestScheduler.getServerKey(
contentResource.getUrlComponent(),
);
this._innerContentResources[i] = contentResource;
this._serverKeys[i] = serverKey;
}
}
Object.defineProperties(Multiple3DTileContent.prototype, {
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code> checks if any of the inner contents have dirty featurePropertiesDirty.
* @memberof Multiple3DTileContent.prototype
*
* @type {boolean}
*
* @private
*/
featurePropertiesDirty: {
get: function () {
const contents = this._contents;
const length = contents.length;
for (let i = 0; i < length; ++i) {
Iif (contents[i].featurePropertiesDirty) {
return true;
}
}
return false;
},
set: function (value) {
const contents = this._contents;
const length = contents.length;
for (let i = 0; i < length; ++i) {
contents[i].featurePropertiesDirty = value;
}
},
},
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code>
* always returns <code>0</code>. Instead call <code>featuresLength</code> for a specific inner content.
*
* @memberof Multiple3DTileContent.prototype
*
* @type {number}
* @readonly
*
* @private
*/
featuresLength: {
get: function () {
return 0;
},
},
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code>
* always returns <code>0</code>. Instead, call <code>pointsLength</code> for a specific inner content.
*
* @memberof Multiple3DTileContent.prototype
*
* @type {number}
* @readonly
*
* @private
*/
pointsLength: {
get: function () {
return 0;
},
},
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code>
* always returns <code>0</code>. Instead call <code>trianglesLength</code> for a specific inner content.
*
* @memberof Multiple3DTileContent.prototype
*
* @type {number}
* @readonly
*
* @private
*/
trianglesLength: {
get: function () {
return 0;
},
},
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code>
* always returns <code>0</code>. Instead call <code>geometryByteLength</code> for a specific inner content.
*
* @memberof Multiple3DTileContent.prototype
*
* @type {number}
* @readonly
*
* @private
*/
geometryByteLength: {
get: function () {
return 0;
},
},
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code>
* always returns <code>0</code>. Instead call <code>texturesByteLength</code> for a specific inner content.
*
* @memberof Multiple3DTileContent.prototype
*
* @type {number}
* @readonly
*
* @private
*/
texturesByteLength: {
get: function () {
return 0;
},
},
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code>
* always returns <code>0</code>. Instead call <code>batchTableByteLength</code> for a specific inner content.
*
* @memberof Multiple3DTileContent.prototype
*
* @type {number}
* @readonly
*
* @private
*/
batchTableByteLength: {
get: function () {
return 0;
},
},
innerContents: {
get: function () {
return this._contents;
},
},
/**
* Returns true when the tile's content is ready to render; otherwise false
*
* @memberof Multiple3DTileContent.prototype
*
* @type {boolean}
* @readonly
* @private
*/
ready: {
get: function () {
Iif (!this._contentsCreated) {
return false;
}
return this._ready;
},
},
tileset: {
get: function () {
return this._tileset;
},
},
tile: {
get: function () {
return this._tile;
},
},
/**
* Part of the {@link Cesium3DTileContent} interface.
* Unlike other content types, <code>Multiple3DTileContent</code> does not
* have a single URL, so this returns undefined.
* @memberof Multiple3DTileContent.prototype
*
* @type {string}
* @readonly
* @private
*/
url: {
get: function () {
return undefined;
},
},
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code>
* always returns <code>undefined</code>. Instead call <code>metadata</code> for a specific inner content.
* @memberof Multiple3DTileContent.prototype
* @private
*/
metadata: {
get: function () {
return undefined;
},
set: function () {
//>>includeStart('debug', pragmas.debug);
throw new DeveloperError("Multiple3DTileContent cannot have metadata");
//>>includeEnd('debug');
},
},
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code>
* always returns <code>undefined</code>. Instead call <code>batchTable</code> for a specific inner content.
* @memberof Multiple3DTileContent.prototype
* @private
*/
batchTable: {
get: function () {
return undefined;
},
},
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code>
* always returns <code>undefined</code>. Instead call <code>group</code> for a specific inner content.
* @memberof Multiple3DTileContent.prototype
* @private
*/
group: {
get: function () {
return undefined;
},
set: function () {
//>>includeStart('debug', pragmas.debug);
throw new DeveloperError(
"Multiple3DTileContent cannot have group metadata",
);
//>>includeEnd('debug');
},
},
/**
* Get an array of the inner content URLs, regardless of whether they've
* been fetched or not. This is intended for use with
* {@link Cesium3DTileset#debugShowUrl}.
* @memberof Multiple3DTileContent.prototype
*
* @type {string[]}
* @readonly
* @private
*/
innerContentUrls: {
get: function () {
return this._innerContentHeaders.map(function (contentHeader) {
return contentHeader.uri;
});
},
},
});
function updatePendingRequests(multipleContents, deltaRequestCount) {
multipleContents._requestsInFlight += deltaRequestCount;
multipleContents.tileset.statistics.numberOfPendingRequests +=
deltaRequestCount;
}
function cancelPendingRequests(multipleContents, originalContentState) {
multipleContents._cancelCount++;
// reset the tile's content state to try again later.
multipleContents._tile._contentState = originalContentState;
const statistics = multipleContents.tileset.statistics;
statistics.numberOfPendingRequests -= multipleContents._requestsInFlight;
statistics.numberOfAttemptedRequests += multipleContents._requestsInFlight;
multipleContents._requestsInFlight = 0;
// Discard the request promises.
const contentCount = multipleContents._innerContentHeaders.length;
multipleContents._arrayFetchPromises = new Array(contentCount);
}
/**
* Request the inner contents of this <code>Multiple3DTileContent</code>. This must be called once a frame until
* {@link Multiple3DTileContent#contentsFetchedPromise} is defined. This promise
* becomes available as soon as all requests are scheduled.
* <p>
* This method also updates the tile statistics' pending request count if the
* requests are successfully scheduled.
* </p>
*
* @return {Promise<void>|undefined} A promise that resolves when the request completes, or undefined if there is no request needed, or the request cannot be scheduled.
* @private
*/
Multiple3DTileContent.prototype.requestInnerContents = function () {
// It's possible for these promises to leak content array buffers if the
// camera moves before they all are scheduled. To prevent this leak, check
// if we can schedule all the requests at once. If not, no requests are
// scheduled
if (!canScheduleAllRequests(this._serverKeys)) {
this.tileset.statistics.numberOfAttemptedRequests +=
this._serverKeys.length;
return;
}
const contentHeaders = this._innerContentHeaders;
updatePendingRequests(this, contentHeaders.length);
const originalCancelCount = this._cancelCount;
for (let i = 0; i < contentHeaders.length; i++) {
// The cancel count is needed to avoid a race condition where a content
// is canceled multiple times.
this._arrayFetchPromises[i] = requestInnerContent(
this,
i,
originalCancelCount,
this._tile._contentState,
);
}
return createInnerContents(this);
};
/**
* Check if all requests for inner contents can be scheduled at once. This is slower, but it avoids a potential memory leak.
* @param {string[]} serverKeys The server keys for all of the inner contents
* @return {boolean} True if the request scheduler has enough open slots for all inner contents
* @private
*/
function canScheduleAllRequests(serverKeys) {
const requestCountsByServer = {};
for (let i = 0; i < serverKeys.length; i++) {
const serverKey = serverKeys[i];
if (defined(requestCountsByServer[serverKey])) {
requestCountsByServer[serverKey]++;
} else {
requestCountsByServer[serverKey] = 1;
}
}
for (const key in requestCountsByServer) {
if (
requestCountsByServer.hasOwnProperty(key) &&
!RequestScheduler.serverHasOpenSlots(key, requestCountsByServer[key])
) {
return false;
}
}
return RequestScheduler.heapHasOpenSlots(serverKeys.length);
}
function requestInnerContent(
multipleContents,
index,
originalCancelCount,
originalContentState,
) {
// it is important to clone here. The fetchArrayBuffer() below here uses
// throttling, but other uses of the resources do not.
const contentResource =
multipleContents._innerContentResources[index].clone();
const tile = multipleContents.tile;
// Always create a new request. If the tile gets canceled, this
// avoids getting stuck in the canceled state.
const priorityFunction = function () {
return tile._priority;
};
const serverKey = multipleContents._serverKeys[index];
const request = new Request({
throttle: true,
throttleByServer: true,
type: RequestType.TILES3D,
priorityFunction: priorityFunction,
serverKey: serverKey,
});
contentResource.request = request;
multipleContents._requests[index] = request;
const promise = contentResource.fetchArrayBuffer();
Iif (!defined(promise)) {
return;
}
return promise
.then(function (arrayBuffer) {
// Pending requests have already been canceled.
if (originalCancelCount < multipleContents._cancelCount) {
return;
}
if (
contentResource.request.cancelled ||
contentResource.request.state === RequestState.CANCELLED
) {
cancelPendingRequests(multipleContents, originalContentState);
return;
}
updatePendingRequests(multipleContents, -1);
return arrayBuffer;
})
.catch(function (error) {
// Pending requests have already been canceled.
if (originalCancelCount < multipleContents._cancelCount) {
return;
}
if (
contentResource.request.cancelled ||
contentResource.request.state === RequestState.CANCELLED
) {
cancelPendingRequests(multipleContents, originalContentState);
return;
}
updatePendingRequests(multipleContents, -1);
handleInnerContentFailed(multipleContents, index, error);
});
}
async function createInnerContents(multipleContents) {
const originalCancelCount = multipleContents._cancelCount;
const arrayBuffers = await Promise.all(multipleContents._arrayFetchPromises);
// Request have been cancelled
if (originalCancelCount < multipleContents._cancelCount) {
return;
}
const promises = arrayBuffers.map((arrayBuffer, i) =>
createInnerContent(multipleContents, arrayBuffer, i),
);
// Even if we had a partial success (in which case the inner promise will be handled, but the content will not be returned), mark that we finished creating
// contents
const contents = await Promise.all(promises);
multipleContents._contentsCreated = true;
multipleContents._contents = contents.filter(defined);
// If each content is an external tileset, then the tile
// itself does not have any renderable content
if (
multipleContents._externalTilesetCount === multipleContents._contents.length
) {
const tile = multipleContents._tile;
tile.hasRenderableContent = false;
}
return contents;
}
async function createInnerContent(multipleContents, arrayBuffer, index) {
if (!defined(arrayBuffer)) {
// Content was not fetched. The error was handled in
// the fetch promise. Return undefined to indicate partial failure.
return;
}
try {
const preprocessed = preprocess3DTileContent(arrayBuffer);
const tileset = multipleContents._tileset;
const resource = multipleContents._innerContentResources[index];
const tile = multipleContents._tile;
if (preprocessed.contentType === Cesium3DTileContentType.EXTERNAL_TILESET) {
multipleContents._externalTilesetCount++;
tile.hasTilesetContent = true;
}
multipleContents._disableSkipLevelOfDetail =
multipleContents._disableSkipLevelOfDetail ||
preprocessed.contentType === Cesium3DTileContentType.GEOMETRY ||
preprocessed.contentType === Cesium3DTileContentType.VECTOR;
let content;
const contentFactory = Cesium3DTileContentFactory[preprocessed.contentType];
if (defined(preprocessed.binaryPayload)) {
content = await Promise.resolve(
contentFactory(
tileset,
tile,
resource,
preprocessed.binaryPayload.buffer,
0,
),
);
} else {
// JSON formats
content = await Promise.resolve(
contentFactory(tileset, tile, resource, preprocessed.jsonPayload),
);
}
const contentHeader = multipleContents._innerContentHeaders[index];
if (tile.hasImplicitContentMetadata) {
const subtree = tile.implicitSubtree;
const coordinates = tile.implicitCoordinates;
content.metadata = subtree.getContentMetadataView(coordinates, index);
} else Eif (!tile.hasImplicitContent) {
content.metadata = findContentMetadata(tileset, contentHeader);
}
const groupMetadata = findGroupMetadata(tileset, contentHeader);
if (defined(groupMetadata)) {
content.group = new Cesium3DContentGroup({
metadata: groupMetadata,
});
}
return content;
} catch (error) {
handleInnerContentFailed(multipleContents, index, error);
}
}
function handleInnerContentFailed(multipleContents, index, error) {
const tileset = multipleContents._tileset;
const url = multipleContents._innerContentResources[index].url;
const message = defined(error.message) ? error.message : error.toString();
if (tileset.tileFailed.numberOfListeners > 0) {
tileset.tileFailed.raiseEvent({
url: url,
message: message,
});
} else {
console.log(`A content failed to load: ${url}`);
console.log(`Error: ${message}`);
}
}
/**
* Cancel all requests for inner contents. This is called by the tile
* when a tile goes out of view.
*
* @private
*/
Multiple3DTileContent.prototype.cancelRequests = function () {
for (let i = 0; i < this._requests.length; i++) {
const request = this._requests[i];
Eif (defined(request)) {
request.cancel();
}
}
};
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code>
* always returns <code>false</code>. Instead call <code>hasProperty</code> for a specific inner content
* @private
*/
Multiple3DTileContent.prototype.hasProperty = function (batchId, name) {
return false;
};
/**
* Part of the {@link Cesium3DTileContent} interface. <code>Multiple3DTileContent</code>
* always returns <code>undefined</code>. Instead call <code>getFeature</code> for a specific inner content
* @private
*/
Multiple3DTileContent.prototype.getFeature = function (batchId) {
return undefined;
};
Multiple3DTileContent.prototype.applyDebugSettings = function (enabled, color) {
const contents = this._contents;
const length = contents.length;
for (let i = 0; i < length; ++i) {
contents[i].applyDebugSettings(enabled, color);
}
};
Multiple3DTileContent.prototype.applyStyle = function (style) {
const contents = this._contents;
const length = contents.length;
for (let i = 0; i < length; ++i) {
contents[i].applyStyle(style);
}
};
Multiple3DTileContent.prototype.update = function (tileset, frameState) {
const contents = this._contents;
const length = contents.length;
let ready = true;
for (let i = 0; i < length; ++i) {
contents[i].update(tileset, frameState);
ready = ready && contents[i].ready;
}
if (!this._ready && ready) {
this._ready = true;
}
};
/**
* Find an intersection between a ray and the tile content surface that was rendered. The ray must be given in world coordinates.
*
* @param {Ray} ray The ray to test for intersection.
* @param {FrameState} frameState The frame state.
* @param {Cartesian3|undefined} [result] The intersection or <code>undefined</code> if none was found.
* @returns {Cartesian3|undefined} The intersection or <code>undefined</code> if none was found.
*
* @private
*/
Multiple3DTileContent.prototype.pick = function (ray, frameState, result) {
if (!this._ready) {
return undefined;
}
let intersection;
let minDistance = Number.POSITIVE_INFINITY;
const contents = this._contents;
const length = contents.length;
for (let i = 0; i < length; ++i) {
const candidate = contents[i].pick(ray, frameState, result);
if (!defined(candidate)) {
continue;
}
const distance = Cartesian3.distance(ray.origin, candidate);
if (distance < minDistance) {
intersection = candidate;
minDistance = distance;
}
}
if (!defined(intersection)) {
return undefined;
}
return result;
};
Multiple3DTileContent.prototype.isDestroyed = function () {
return false;
};
Multiple3DTileContent.prototype.destroy = function () {
const contents = this._contents;
const length = contents.length;
for (let i = 0; i < length; ++i) {
contents[i].destroy();
}
return destroyObject(this);
};
export default Multiple3DTileContent;
|