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import ComponentDatatype from "../Core/ComponentDatatype.js";
import Frozen from "../Core/Frozen.js";
import defined from "../Core/defined.js";
import deprecationWarning from "../Core/deprecationWarning.js";
import DeveloperError from "../Core/DeveloperError.js";
import IndexDatatype from "../Core/IndexDatatype.js";
import Buffer from "../Renderer/Buffer.js";
import BufferUsage from "../Renderer/BufferUsage.js";
import JobType from "./JobType.js";
import ResourceLoader from "./ResourceLoader.js";
import ResourceLoaderState from "./ResourceLoaderState.js";
/**
* Loads an index buffer from a glTF accessor.
* <p>
* Implements the {@link ResourceLoader} interface.
* </p>
*
* @alias GltfIndexBufferLoader
* @constructor
* @augments ResourceLoader
*
* @param {object} options Object with the following properties:
* @param {ResourceCache} options.resourceCache The {@link ResourceCache} (to avoid circular dependencies).
* @param {object} options.gltf The glTF JSON.
* @param {number} options.accessorId The accessor ID corresponding to the index buffer.
* @param {Resource} options.gltfResource The {@link Resource} containing the glTF.
* @param {Resource} options.baseResource The {@link Resource} that paths in the glTF JSON are relative to.
* @param {object} [options.primitive] The primitive containing the Draco extension.
* @param {object} [options.draco] The Draco extension object.
* @param {string} [options.cacheKey] The cache key of the resource.
* @param {boolean} [options.asynchronous=true] Determines if WebGL resource creation will be spread out over several frames or block until all WebGL resources are created.
* @param {boolean} [options.loadBuffer=false] Load the index buffer as a GPU index buffer.
* @param {boolean} [options.loadTypedArray=false] Load the index buffer as a typed array.
* @private
*/
function GltfIndexBufferLoader(options) {
options = options ?? Frozen.EMPTY_OBJECT;
const resourceCache = options.resourceCache;
const gltf = options.gltf;
const accessorId = options.accessorId;
const gltfResource = options.gltfResource;
const baseResource = options.baseResource;
const primitive = options.primitive;
const draco = options.draco;
const cacheKey = options.cacheKey;
const asynchronous = options.asynchronous ?? true;
const loadBuffer = options.loadBuffer ?? false;
const loadTypedArray = options.loadTypedArray ?? false;
//>>includeStart('debug', pragmas.debug);
Check.typeOf.func("options.resourceCache", resourceCache);
Check.typeOf.object("options.gltf", gltf);
Check.typeOf.number("options.accessorId", accessorId);
Check.typeOf.object("options.gltfResource", gltfResource);
Check.typeOf.object("options.baseResource", baseResource);
if (!loadBuffer && !loadTypedArray) {
throw new DeveloperError(
"At least one of loadBuffer and loadTypedArray must be true.",
);
}
//>>includeEnd('debug');
const indexDatatype = gltf.accessors[accessorId].componentType;
this._resourceCache = resourceCache;
this._gltfResource = gltfResource;
this._baseResource = baseResource;
this._gltf = gltf;
this._accessorId = accessorId;
this._indexDatatype = indexDatatype;
this._primitive = primitive;
this._draco = draco;
this._cacheKey = cacheKey;
this._asynchronous = asynchronous;
this._loadBuffer = loadBuffer;
this._loadTypedArray = loadTypedArray;
this._bufferViewLoader = undefined;
this._dracoLoader = undefined;
this._typedArray = undefined;
this._buffer = undefined;
this._state = ResourceLoaderState.UNLOADED;
this._promise = undefined;
}
Eif (defined(Object.create)) {
GltfIndexBufferLoader.prototype = Object.create(ResourceLoader.prototype);
GltfIndexBufferLoader.prototype.constructor = GltfIndexBufferLoader;
}
Object.defineProperties(GltfIndexBufferLoader.prototype, {
/**
* The cache key of the resource.
*
* @memberof GltfIndexBufferLoader.prototype
*
* @type {string}
* @readonly
* @private
*/
cacheKey: {
get: function () {
return this._cacheKey;
},
},
/**
* The index buffer. This is only defined when <code>loadBuffer</code> is true.
*
* @memberof GltfIndexBufferLoader.prototype
*
* @type {Buffer}
* @readonly
* @private
*/
buffer: {
get: function () {
return this._buffer;
},
},
/**
* The typed array containing indices. This is only defined when <code>loadTypedArray</code> is true.
*
* @memberof GltfIndexBufferLoader.prototype
*
* @type {Uint8Array|Uint16Array|Uint32Array}
* @readonly
* @private
*/
typedArray: {
get: function () {
return this._typedArray;
},
},
/**
* The index datatype after decode.
*
* @memberof GltfIndexBufferLoader.prototype
*
* @type {IndexDatatype}
* @readonly
* @private
*/
indexDatatype: {
get: function () {
return this._indexDatatype;
},
},
});
const scratchIndexBufferJob = new CreateIndexBufferJob();
/**
* Loads the resource.
* @returns {Promise<GltfIndexBufferLoader>} A promise which resolves to the loader when the resource loading is completed.
* @private
*/
GltfIndexBufferLoader.prototype.load = async function () {
if (defined(this._promise)) {
return this._promise;
}
if (defined(this._draco)) {
this._promise = loadFromDraco(this);
return this._promise;
}
this._promise = loadFromBufferView(this);
return this._promise;
};
async function loadFromDraco(indexBufferLoader) {
indexBufferLoader._state = ResourceLoaderState.LOADING;
const resourceCache = indexBufferLoader._resourceCache;
try {
const dracoLoader = resourceCache.getDracoLoader({
gltf: indexBufferLoader._gltf,
primitive: indexBufferLoader._primitive,
draco: indexBufferLoader._draco,
gltfResource: indexBufferLoader._gltfResource,
baseResource: indexBufferLoader._baseResource,
});
indexBufferLoader._dracoLoader = dracoLoader;
await dracoLoader.load();
Iif (indexBufferLoader.isDestroyed()) {
return;
}
// Now wait for process() to run to finish loading
indexBufferLoader._state = ResourceLoaderState.LOADED;
return indexBufferLoader;
} catch (error) {
if (indexBufferLoader.isDestroyed()) {
return;
}
handleError(indexBufferLoader, error);
}
}
async function loadFromBufferView(indexBufferLoader) {
const gltf = indexBufferLoader._gltf;
const accessorId = indexBufferLoader._accessorId;
const accessor = gltf.accessors[accessorId];
const bufferViewId = accessor.bufferView;
indexBufferLoader._state = ResourceLoaderState.LOADING;
const resourceCache = indexBufferLoader._resourceCache;
try {
const bufferViewLoader = resourceCache.getBufferViewLoader({
gltf: gltf,
bufferViewId: bufferViewId,
gltfResource: indexBufferLoader._gltfResource,
baseResource: indexBufferLoader._baseResource,
});
indexBufferLoader._bufferViewLoader = bufferViewLoader;
await bufferViewLoader.load();
if (indexBufferLoader.isDestroyed()) {
return;
}
const bufferViewTypedArray = bufferViewLoader.typedArray;
indexBufferLoader._typedArray = createIndicesTypedArray(
indexBufferLoader,
bufferViewTypedArray,
);
indexBufferLoader._state = ResourceLoaderState.PROCESSING;
return indexBufferLoader;
} catch (error) {
Iif (indexBufferLoader.isDestroyed()) {
return;
}
handleError(indexBufferLoader, error);
}
}
function createIndicesTypedArray(indexBufferLoader, bufferViewTypedArray) {
const gltf = indexBufferLoader._gltf;
const accessorId = indexBufferLoader._accessorId;
const accessor = gltf.accessors[accessorId];
const count = accessor.count;
const indexDatatype = accessor.componentType;
const indexSize = IndexDatatype.getSizeInBytes(indexDatatype);
let arrayBuffer = bufferViewTypedArray.buffer;
let byteOffset = bufferViewTypedArray.byteOffset + accessor.byteOffset;
Iif (byteOffset % indexSize !== 0) {
const byteLength = count * indexSize;
const view = new Uint8Array(arrayBuffer, byteOffset, byteLength);
const copy = new Uint8Array(view);
arrayBuffer = copy.buffer;
byteOffset = 0;
deprecationWarning(
"index-buffer-unaligned",
`The index array is not aligned to a ${indexSize}-byte boundary.`,
);
}
let typedArray;
if (indexDatatype === IndexDatatype.UNSIGNED_BYTE) {
typedArray = new Uint8Array(arrayBuffer, byteOffset, count);
} else if (indexDatatype === IndexDatatype.UNSIGNED_SHORT) {
typedArray = new Uint16Array(arrayBuffer, byteOffset, count);
} else Eif (indexDatatype === IndexDatatype.UNSIGNED_INT) {
typedArray = new Uint32Array(arrayBuffer, byteOffset, count);
}
return typedArray;
}
function handleError(indexBufferLoader, error) {
indexBufferLoader.unload();
indexBufferLoader._state = ResourceLoaderState.FAILED;
const errorMessage = "Failed to load index buffer";
throw indexBufferLoader.getError(errorMessage, error);
}
function CreateIndexBufferJob() {
this.typedArray = undefined;
this.indexDatatype = undefined;
this.context = undefined;
this.buffer = undefined;
}
CreateIndexBufferJob.prototype.set = function (
typedArray,
indexDatatype,
context,
) {
this.typedArray = typedArray;
this.indexDatatype = indexDatatype;
this.context = context;
};
CreateIndexBufferJob.prototype.execute = function () {
this.buffer = createIndexBuffer(
this.typedArray,
this.indexDatatype,
this.context,
);
};
function createIndexBuffer(typedArray, indexDatatype, context) {
const buffer = Buffer.createIndexBuffer({
typedArray: typedArray,
context: context,
usage: BufferUsage.STATIC_DRAW,
indexDatatype: indexDatatype,
});
buffer.vertexArrayDestroyable = false;
return buffer;
}
/**
* Processes the resource until it becomes ready.
*
* @param {FrameState} frameState The frame state.
* @private
*/
GltfIndexBufferLoader.prototype.process = function (frameState) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("frameState", frameState);
//>>includeEnd('debug');
if (this._state === ResourceLoaderState.READY) {
return true;
}
if (
this._state !== ResourceLoaderState.LOADED &&
this._state !== ResourceLoaderState.PROCESSING
) {
return false;
}
let typedArray = this._typedArray;
let indexDatatype = this._indexDatatype;
if (defined(this._dracoLoader)) {
try {
const ready = this._dracoLoader.process(frameState);
if (ready) {
const dracoLoader = this._dracoLoader;
typedArray = dracoLoader.decodedData.indices.typedArray;
this._typedArray = typedArray;
// The index datatype may be a smaller datatype after draco decode
indexDatatype = ComponentDatatype.fromTypedArray(typedArray);
this._indexDatatype = indexDatatype;
}
} catch (error) {
handleError(this, error);
}
}
if (!defined(typedArray)) {
// Buffer view hasn't been loaded yet
return false;
}
let buffer;
if (this._loadBuffer && this._asynchronous) {
const indexBufferJob = scratchIndexBufferJob;
indexBufferJob.set(typedArray, indexDatatype, frameState.context);
const jobScheduler = frameState.jobScheduler;
if (!jobScheduler.execute(indexBufferJob, JobType.BUFFER)) {
// Job scheduler is full. Try again next frame.
return false;
}
buffer = indexBufferJob.buffer;
} else if (this._loadBuffer) {
buffer = createIndexBuffer(typedArray, indexDatatype, frameState.context);
}
// Unload everything except the index buffer and/or typed array.
this.unload();
this._buffer = buffer;
this._typedArray = this._loadTypedArray ? typedArray : undefined;
this._state = ResourceLoaderState.READY;
this._resourceCache.statistics.addGeometryLoader(this);
return true;
};
/**
* Unloads the resource.
* @private
*/
GltfIndexBufferLoader.prototype.unload = function () {
if (defined(this._buffer)) {
this._buffer.destroy();
}
const resourceCache = this._resourceCache;
if (
defined(this._bufferViewLoader) &&
!this._bufferViewLoader.isDestroyed()
) {
resourceCache.unload(this._bufferViewLoader);
}
if (defined(this._dracoLoader)) {
resourceCache.unload(this._dracoLoader);
}
this._bufferViewLoader = undefined;
this._dracoLoader = undefined;
this._typedArray = undefined;
this._buffer = undefined;
this._gltf = undefined;
this._primitive = undefined;
};
export default GltfIndexBufferLoader;
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