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import Frozen from "../Core/Frozen.js";
import defined from "../Core/defined.js";
import DeveloperError from "../Core/DeveloperError.js";
import Buffer from "../Renderer/Buffer.js";
import BufferUsage from "../Renderer/BufferUsage.js";
import AttributeType from "./AttributeType.js";
import JobType from "./JobType.js";
import ModelComponents from "./ModelComponents.js";
import ResourceLoader from "./ResourceLoader.js";
import ResourceLoaderState from "./ResourceLoaderState.js";
import CesiumMath from "../Core/Math.js";
/**
* Loads a vertex buffer from a glTF buffer view.
* <p>
* Implements the {@link ResourceLoader} interface.
* </p>
*
* @alias GltfVertexBufferLoader
* @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 {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 {number} [options.bufferViewId] The bufferView ID corresponding to the vertex buffer.
* @param {object} [options.primitive] The primitive containing the Draco extension.
* @param {object} [options.draco] The Draco extension object.
* @param {string} [options.attributeSemantic] The attribute semantic, e.g. POSITION or NORMAL.
* @param {number} [options.accessorId] The accessor id.
* @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 vertex buffer as a GPU vertex buffer.
* @param {boolean} [options.loadTypedArray=false] Load vertex buffer as a typed array.
*
* @exception {DeveloperError} One of options.bufferViewId and options.draco must be defined.
* @exception {DeveloperError} When options.draco is defined options.attributeSemantic must also be defined.
* @exception {DeveloperError} When options.draco is defined options.accessorId must also be defined.
*
* @private
*/
function GltfVertexBufferLoader(options) {
options = options ?? Frozen.EMPTY_OBJECT;
const resourceCache = options.resourceCache;
const gltf = options.gltf;
const gltfResource = options.gltfResource;
const baseResource = options.baseResource;
const bufferViewId = options.bufferViewId;
const primitive = options.primitive;
const draco = options.draco;
const attributeSemantic = options.attributeSemantic;
const accessorId = options.accessorId;
const cacheKey = options.cacheKey;
const spz = options.spz;
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.object("options.gltfResource", gltfResource);
Check.typeOf.object("options.baseResource", baseResource);
Iif (!loadBuffer && !loadTypedArray) {
throw new DeveloperError(
"At least one of loadBuffer and loadTypedArray must be true.",
);
}
const hasBufferViewId = defined(bufferViewId);
const hasPrimitive = defined(primitive);
const hasDraco = hasDracoCompression(draco, attributeSemantic);
const hasAttributeSemantic = defined(attributeSemantic);
const hasAccessorId = defined(accessorId);
const hasSpz = defined(spz);
if (hasBufferViewId === (hasDraco !== hasSpz)) {
throw new DeveloperError(
"One of options.bufferViewId, options.draco, or options.spz must be defined.",
);
}
Iif (hasDraco && !hasAttributeSemantic) {
throw new DeveloperError(
"When options.draco is defined options.attributeSemantic must also be defined.",
);
}
if (hasDraco && !hasAccessorId) {
throw new DeveloperError(
"When options.draco is defined options.accessorId must also be defined.",
);
}
if (hasDraco && !hasPrimitive) {
throw new DeveloperError(
"When options.draco is defined options.primitive must also be defined.",
);
}
if (hasDraco) {
Check.typeOf.object("options.primitive", primitive);
Check.typeOf.object("options.draco", draco);
Check.typeOf.string("options.attributeSemantic", attributeSemantic);
Check.typeOf.number("options.accessorId", accessorId);
}
//>>includeEnd('debug');
this._resourceCache = resourceCache;
this._gltfResource = gltfResource;
this._baseResource = baseResource;
this._gltf = gltf;
this._bufferViewId = bufferViewId;
this._primitive = primitive;
this._draco = draco;
this._spz = spz;
this._attributeSemantic = attributeSemantic;
this._accessorId = accessorId;
this._cacheKey = cacheKey;
this._asynchronous = asynchronous;
this._loadBuffer = loadBuffer;
this._loadTypedArray = loadTypedArray;
this._bufferViewLoader = undefined;
this._dracoLoader = undefined;
this._quantization = undefined;
this._typedArray = undefined;
this._buffer = undefined;
this._state = ResourceLoaderState.UNLOADED;
this._promise = undefined;
}
Eif (defined(Object.create)) {
GltfVertexBufferLoader.prototype = Object.create(ResourceLoader.prototype);
GltfVertexBufferLoader.prototype.constructor = GltfVertexBufferLoader;
}
Object.defineProperties(GltfVertexBufferLoader.prototype, {
/**
* The cache key of the resource.
*
* @memberof GltfVertexBufferLoader.prototype
*
* @type {string}
* @readonly
* @private
*/
cacheKey: {
get: function () {
return this._cacheKey;
},
},
/**
* The vertex buffer. This is only defined when <code>loadAsTypedArray</code> is false.
*
* @memberof GltfVertexBufferLoader.prototype
*
* @type {Buffer}
* @readonly
* @private
*/
buffer: {
get: function () {
return this._buffer;
},
},
/**
* The typed array containing vertex buffer data. This is only defined when <code>loadAsTypedArray</code> is true.
*
* @memberof GltfVertexBufferLoader.prototype
*
* @type {Uint8Array}
* @readonly
* @private
*/
typedArray: {
get: function () {
return this._typedArray;
},
},
/**
* Information about the quantized vertex attribute after Draco decode.
*
* @memberof GltfVertexBufferLoader.prototype
*
* @type {ModelComponents.Quantization}
* @readonly
* @private
*/
quantization: {
get: function () {
return this._quantization;
},
},
});
function hasDracoCompression(draco, semantic) {
return (
defined(draco) &&
defined(draco.attributes) &&
defined(draco.attributes[semantic])
);
}
/**
* Loads the resource.
* @returns {Promise<GltfVertexBufferLoader>} A promise which resolves to the loader when the resource loading is completed.
* @private
*/
GltfVertexBufferLoader.prototype.load = async function () {
if (defined(this._promise)) {
return this._promise;
}
if (defined(this._spz)) {
this._promise = loadFromSpz(this);
return this._promise;
}
if (hasDracoCompression(this._draco, this._attributeSemantic)) {
this._promise = loadFromDraco(this);
return this._promise;
}
this._promise = loadFromBufferView(this);
return this._promise;
};
function getQuantizationInformation(
dracoQuantization,
componentDatatype,
componentCount,
type,
) {
const quantizationBits = dracoQuantization.quantizationBits;
const normalizationRange = (1 << quantizationBits) - 1;
const normalizationDivisor = 1.0 / normalizationRange;
const quantization = new ModelComponents.Quantization();
quantization.componentDatatype = componentDatatype;
quantization.octEncoded = dracoQuantization.octEncoded;
quantization.octEncodedZXY = true;
quantization.type = type;
if (quantization.octEncoded) {
quantization.type = AttributeType.VEC2;
quantization.normalizationRange = normalizationRange;
} else {
const MathType = AttributeType.getMathType(type);
Iif (MathType === Number) {
const dimensions = dracoQuantization.range;
quantization.quantizedVolumeOffset = dracoQuantization.minValues[0];
quantization.quantizedVolumeDimensions = dimensions;
quantization.normalizationRange = normalizationRange;
quantization.quantizedVolumeStepSize = dimensions * normalizationDivisor;
} else {
quantization.quantizedVolumeOffset = MathType.unpack(
dracoQuantization.minValues,
);
quantization.normalizationRange = MathType.unpack(
new Array(componentCount).fill(normalizationRange),
);
const packedDimensions = new Array(componentCount).fill(
dracoQuantization.range,
);
quantization.quantizedVolumeDimensions =
MathType.unpack(packedDimensions);
// Computing the step size
const packedSteps = packedDimensions.map(function (dimension) {
return dimension * normalizationDivisor;
});
quantization.quantizedVolumeStepSize = MathType.unpack(packedSteps);
}
}
return quantization;
}
async function loadFromSpz(vertexBufferLoader) {
vertexBufferLoader._state = ResourceLoaderState.LOADING;
const resourceCache = vertexBufferLoader._resourceCache;
try {
const spzLoader = resourceCache.getSpzLoader({
gltf: vertexBufferLoader._gltf,
primitive: vertexBufferLoader._primitive,
spz: vertexBufferLoader._spz,
gltfResource: vertexBufferLoader._gltfResource,
baseResource: vertexBufferLoader._baseResource,
});
vertexBufferLoader._spzLoader = spzLoader;
await spzLoader.load();
Iif (vertexBufferLoader.isDestroyed()) {
return;
}
vertexBufferLoader._state = ResourceLoaderState.LOADED;
return vertexBufferLoader;
} catch {
if (vertexBufferLoader.isDestroyed()) {
return;
}
}
}
function getShAttributePrefix(attribute) {
const prefix = attribute.startsWith("KHR_gaussian_splatting:")
? "KHR_gaussian_splatting:"
: "_";
return `${prefix}SH_DEGREE_`;
}
function extractSHDegreeAndCoef(attribute) {
const prefix = getShAttributePrefix(attribute);
const separator = "_COEF_";
const lStart = prefix.length;
const coefIndex = attribute.indexOf(separator, lStart);
const l = parseInt(attribute.slice(lStart, coefIndex), 10);
const n = parseInt(attribute.slice(coefIndex + separator.length), 10);
return { l, n };
}
function processSpz(vertexBufferLoader) {
vertexBufferLoader._state = ResourceLoaderState.PROCESSING;
const spzLoader = vertexBufferLoader._spzLoader;
const gcloudData = spzLoader.decodedData.gcloud;
if (vertexBufferLoader._attributeSemantic === "POSITION") {
vertexBufferLoader._typedArray = gcloudData.positions;
} else if (
vertexBufferLoader._attributeSemantic === "KHR_gaussian_splatting:SCALE" ||
vertexBufferLoader._attributeSemantic === "_SCALE"
) {
vertexBufferLoader._typedArray = gcloudData.scales;
} else if (
vertexBufferLoader._attributeSemantic ===
"KHR_gaussian_splatting:ROTATION" ||
vertexBufferLoader._attributeSemantic === "_ROTATION"
) {
vertexBufferLoader._typedArray = gcloudData.rotations;
} else if (vertexBufferLoader._attributeSemantic === "COLOR_0") {
const colors = gcloudData.colors;
const alphas = gcloudData.alphas;
vertexBufferLoader._typedArray = new Uint8Array((colors.length / 3) * 4);
for (let i = 0; i < colors.length / 3; i++) {
vertexBufferLoader._typedArray[i * 4] = CesiumMath.clamp(
colors[i * 3] * 255.0,
0.0,
255.0,
);
vertexBufferLoader._typedArray[i * 4 + 1] = CesiumMath.clamp(
colors[i * 3 + 1] * 255.0,
0.0,
255.0,
);
vertexBufferLoader._typedArray[i * 4 + 2] = CesiumMath.clamp(
colors[i * 3 + 2] * 255.0,
0.0,
255.0,
);
vertexBufferLoader._typedArray[i * 4 + 3] = CesiumMath.clamp(
alphas[i] * 255.0,
0.0,
255.0,
);
}
} else Eif (vertexBufferLoader._attributeSemantic.includes("SH_DEGREE_")) {
const { l, n } = extractSHDegreeAndCoef(
vertexBufferLoader._attributeSemantic,
);
const sphericalHarmonicDegree = gcloudData.shDegree;
let stride = 0;
const base = [0, 9, 24];
switch (sphericalHarmonicDegree) {
case 1:
stride = 9;
break;
case 2:
stride = 24;
break;
case 3:
stride = 45;
break;
}
const count = gcloudData.numPoints;
const sh = gcloudData.sh;
vertexBufferLoader._typedArray = new Float32Array(count * 3);
for (let i = 0; i < count; i++) {
const idx = i * stride + base[l - 1] + n * 3;
vertexBufferLoader._typedArray[i * 3] = sh[idx];
vertexBufferLoader._typedArray[i * 3 + 1] = sh[idx + 1];
vertexBufferLoader._typedArray[i * 3 + 2] = sh[idx + 2];
}
}
}
async function loadFromDraco(vertexBufferLoader) {
vertexBufferLoader._state = ResourceLoaderState.LOADING;
const resourceCache = vertexBufferLoader._resourceCache;
try {
const dracoLoader = resourceCache.getDracoLoader({
gltf: vertexBufferLoader._gltf,
primitive: vertexBufferLoader._primitive,
draco: vertexBufferLoader._draco,
gltfResource: vertexBufferLoader._gltfResource,
baseResource: vertexBufferLoader._baseResource,
});
vertexBufferLoader._dracoLoader = dracoLoader;
await dracoLoader.load();
Iif (vertexBufferLoader.isDestroyed()) {
return;
}
// Now wait for process() to run to finish loading
vertexBufferLoader._state = ResourceLoaderState.LOADED;
return vertexBufferLoader;
} catch {
if (vertexBufferLoader.isDestroyed()) {
return;
}
handleError(vertexBufferLoader);
}
}
function processDraco(vertexBufferLoader) {
vertexBufferLoader._state = ResourceLoaderState.PROCESSING;
const dracoLoader = vertexBufferLoader._dracoLoader;
// Get the typed array and quantization information
const decodedVertexAttributes = dracoLoader.decodedData.vertexAttributes;
const attributeSemantic = vertexBufferLoader._attributeSemantic;
const dracoAttribute = decodedVertexAttributes[attributeSemantic];
const accessorId = vertexBufferLoader._accessorId;
const accessor = vertexBufferLoader._gltf.accessors[accessorId];
const type = accessor.type;
const typedArray = dracoAttribute.array;
const dracoQuantization = dracoAttribute.data.quantization;
if (defined(dracoQuantization)) {
vertexBufferLoader._quantization = getQuantizationInformation(
dracoQuantization,
dracoAttribute.data.componentDatatype,
dracoAttribute.data.componentsPerAttribute,
type,
);
}
vertexBufferLoader._typedArray = new Uint8Array(
typedArray.buffer,
typedArray.byteOffset,
typedArray.byteLength,
);
}
async function loadFromBufferView(vertexBufferLoader) {
vertexBufferLoader._state = ResourceLoaderState.LOADING;
const resourceCache = vertexBufferLoader._resourceCache;
try {
const bufferViewLoader = resourceCache.getBufferViewLoader({
gltf: vertexBufferLoader._gltf,
bufferViewId: vertexBufferLoader._bufferViewId,
gltfResource: vertexBufferLoader._gltfResource,
baseResource: vertexBufferLoader._baseResource,
});
vertexBufferLoader._bufferViewLoader = bufferViewLoader;
await bufferViewLoader.load();
if (vertexBufferLoader.isDestroyed()) {
return;
}
vertexBufferLoader._typedArray = bufferViewLoader.typedArray;
vertexBufferLoader._state = ResourceLoaderState.PROCESSING;
return vertexBufferLoader;
} catch (error) {
Iif (vertexBufferLoader.isDestroyed()) {
return;
}
handleError(vertexBufferLoader, error);
}
}
function handleError(vertexBufferLoader, error) {
vertexBufferLoader.unload();
vertexBufferLoader._state = ResourceLoaderState.FAILED;
const errorMessage = "Failed to load vertex buffer";
throw vertexBufferLoader.getError(errorMessage, error);
}
function CreateVertexBufferJob() {
this.typedArray = undefined;
this.context = undefined;
this.buffer = undefined;
}
CreateVertexBufferJob.prototype.set = function (typedArray, context) {
this.typedArray = typedArray;
this.context = context;
};
CreateVertexBufferJob.prototype.execute = function () {
this.buffer = createVertexBuffer(this.typedArray, this.context);
};
function createVertexBuffer(typedArray, context) {
const buffer = Buffer.createVertexBuffer({
typedArray: typedArray,
context: context,
usage: BufferUsage.STATIC_DRAW,
});
buffer.vertexArrayDestroyable = false;
return buffer;
}
const scratchVertexBufferJob = new CreateVertexBufferJob();
/**
* Processes the resource until it becomes ready.
*
* @param {FrameState} frameState The frame state.
* @private
*/
GltfVertexBufferLoader.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;
}
if (defined(this._dracoLoader)) {
try {
const ready = this._dracoLoader.process(frameState);
if (!ready) {
return false;
}
} catch (error) {
handleError(this, error);
}
processDraco(this);
}
if (defined(this._spzLoader)) {
try {
const ready = this._spzLoader.process(frameState);
if (!ready) {
return false;
}
} catch (error) {
handleError(this, error);
}
processSpz(this);
}
let buffer;
const typedArray = this._typedArray;
if (this._loadBuffer && this._asynchronous) {
const vertexBufferJob = scratchVertexBufferJob;
vertexBufferJob.set(typedArray, frameState.context);
const jobScheduler = frameState.jobScheduler;
if (!jobScheduler.execute(vertexBufferJob, JobType.BUFFER)) {
// Job scheduler is full. Try again next frame.
return false;
}
buffer = vertexBufferJob.buffer;
} else if (this._loadBuffer) {
buffer = createVertexBuffer(typedArray, frameState.context);
}
// Unload everything except the vertex buffer
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
*/
GltfVertexBufferLoader.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);
}
if (defined(this._spzLoader)) {
resourceCache.unload(this._spzLoader);
}
this._bufferViewLoader = undefined;
this._dracoLoader = undefined;
this._spzLoader = undefined;
this._typedArray = undefined;
this._buffer = undefined;
this._gltf = undefined;
this._primitive = undefined;
};
export default GltfVertexBufferLoader;
|