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import Frozen from "../Core/Frozen.js";
import defined from "../Core/defined.js";
import loadImageFromTypedArray from "../Core/loadImageFromTypedArray.js";
import loadKTX2 from "../Core/loadKTX2.js";
import RuntimeError from "../Core/RuntimeError.js";
import ResourceLoader from "./ResourceLoader.js";
import ResourceLoaderState from "./ResourceLoaderState.js";
/**
* Loads a glTF image.
* <p>
* Implements the {@link ResourceLoader} interface.
* </p>
*
* @alias GltfImageLoader
* @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.imageId The image ID.
* @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 {string} [options.cacheKey] The cache key of the resource.
*
* @private
*/
function GltfImageLoader(options) {
options = options ?? Frozen.EMPTY_OBJECT;
const resourceCache = options.resourceCache;
const gltf = options.gltf;
const imageId = options.imageId;
const gltfResource = options.gltfResource;
const baseResource = options.baseResource;
const cacheKey = options.cacheKey;
//>>includeStart('debug', pragmas.debug);
Check.typeOf.func("options.resourceCache", resourceCache);
Check.typeOf.object("options.gltf", gltf);
Check.typeOf.number("options.imageId", imageId);
Check.typeOf.object("options.gltfResource", gltfResource);
Check.typeOf.object("options.baseResource", baseResource);
//>>includeEnd('debug');
const image = gltf.images[imageId];
const bufferViewId = image.bufferView;
const uri = image.uri;
this._resourceCache = resourceCache;
this._gltfResource = gltfResource;
this._baseResource = baseResource;
this._gltf = gltf;
this._bufferViewId = bufferViewId;
this._uri = uri;
this._cacheKey = cacheKey;
this._bufferViewLoader = undefined;
this._image = undefined;
this._mipLevels = undefined;
this._state = ResourceLoaderState.UNLOADED;
this._promise = undefined;
}
Eif (defined(Object.create)) {
GltfImageLoader.prototype = Object.create(ResourceLoader.prototype);
GltfImageLoader.prototype.constructor = GltfImageLoader;
}
Object.defineProperties(GltfImageLoader.prototype, {
/**
* The cache key of the resource.
*
* @memberof GltfImageLoader.prototype
*
* @type {string}
* @readonly
* @private
*/
cacheKey: {
get: function () {
return this._cacheKey;
},
},
/**
* The image.
*
* @memberof GltfImageLoader.prototype
*
* @type {Image|ImageBitmap|CompressedTextureBuffer}
* @readonly
* @private
*/
image: {
get: function () {
return this._image;
},
},
/**
* The mip levels. Only defined for KTX2 files containing mip levels.
*
* @memberof GltfImageLoader.prototype
*
* @type {Uint8Array[]}
* @readonly
* @private
*/
mipLevels: {
get: function () {
return this._mipLevels;
},
},
});
/**
* Loads the resource.
* @returns {Promise<GltfImageLoader>} A promise which resolves to the loader when the resource loading is completed.
* @private
*/
GltfImageLoader.prototype.load = function () {
Iif (defined(this._promise)) {
return this._promise;
}
if (defined(this._bufferViewId)) {
this._promise = loadFromBufferView(this);
return this._promise;
}
this._promise = loadFromUri(this);
return this._promise;
};
function getImageAndMipLevels(image) {
// Images transcoded from KTX2 can contain multiple mip levels:
// https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_texture_basisu
let mipLevels;
Iif (Array.isArray(image)) {
// highest detail mip should be level 0
mipLevels = image.slice(1, image.length).map(function (mipLevel) {
return mipLevel.bufferView;
});
image = image[0];
}
return {
image: image,
mipLevels: mipLevels,
};
}
async function loadFromBufferView(imageLoader) {
imageLoader._state = ResourceLoaderState.LOADING;
const resourceCache = imageLoader._resourceCache;
try {
const bufferViewLoader = resourceCache.getBufferViewLoader({
gltf: imageLoader._gltf,
bufferViewId: imageLoader._bufferViewId,
gltfResource: imageLoader._gltfResource,
baseResource: imageLoader._baseResource,
});
imageLoader._bufferViewLoader = bufferViewLoader;
await bufferViewLoader.load();
if (imageLoader.isDestroyed()) {
return;
}
const typedArray = bufferViewLoader.typedArray;
const image = await loadImageFromBufferTypedArray(typedArray);
if (imageLoader.isDestroyed()) {
return;
}
const imageAndMipLevels = getImageAndMipLevels(image);
// Unload everything except the image
imageLoader.unload();
imageLoader._image = imageAndMipLevels.image;
imageLoader._mipLevels = imageAndMipLevels.mipLevels;
imageLoader._state = ResourceLoaderState.READY;
return imageLoader;
} catch (error) {
Iif (imageLoader.isDestroyed()) {
return;
}
return handleError(imageLoader, error, "Failed to load embedded image");
}
}
async function loadFromUri(imageLoader) {
imageLoader._state = ResourceLoaderState.LOADING;
const baseResource = imageLoader._baseResource;
const uri = imageLoader._uri;
const resource = baseResource.getDerivedResource({
url: uri,
});
try {
const image = await loadImageFromUri(resource);
if (imageLoader.isDestroyed()) {
return;
}
const imageAndMipLevels = getImageAndMipLevels(image);
// Unload everything except the image
imageLoader.unload();
imageLoader._image = imageAndMipLevels.image;
imageLoader._mipLevels = imageAndMipLevels.mipLevels;
imageLoader._state = ResourceLoaderState.READY;
return imageLoader;
} catch (error) {
if (imageLoader.isDestroyed()) {
return;
}
return handleError(imageLoader, error, `Failed to load image: ${uri}`);
}
}
function handleError(imageLoader, error, errorMessage) {
imageLoader.unload();
imageLoader._state = ResourceLoaderState.FAILED;
return Promise.reject(imageLoader.getError(errorMessage, error));
}
function getMimeTypeFromTypedArray(typedArray) {
const header = typedArray.subarray(0, 2);
const webpHeaderRIFFChars = typedArray.subarray(0, 4);
const webpHeaderWEBPChars = typedArray.subarray(8, 12);
if (header[0] === 0xff && header[1] === 0xd8) {
// See https://en.wikipedia.org/wiki/JPEG_File_Interchange_Format
return "image/jpeg";
} else if (header[0] === 0x89 && header[1] === 0x50) {
// See http://www.libpng.org/pub/png/spec/1.2/PNG-Structure.html
return "image/png";
} else Iif (header[0] === 0xab && header[1] === 0x4b) {
// See http://github.khronos.org/KTX-Specification/#_identifier
return "image/ktx2";
} else if (
// See https://developers.google.com/speed/webp/docs/riff_container#webp_file_header
webpHeaderRIFFChars[0] === 0x52 &&
webpHeaderRIFFChars[1] === 0x49 &&
webpHeaderRIFFChars[2] === 0x46 &&
webpHeaderRIFFChars[3] === 0x46 &&
webpHeaderWEBPChars[0] === 0x57 &&
webpHeaderWEBPChars[1] === 0x45 &&
webpHeaderWEBPChars[2] === 0x42 &&
webpHeaderWEBPChars[3] === 0x50
) {
return "image/webp";
}
throw new RuntimeError("Image format is not recognized");
}
async function loadImageFromBufferTypedArray(typedArray) {
const mimeType = getMimeTypeFromTypedArray(typedArray);
Iif (mimeType === "image/ktx2") {
// Need to make a copy of the embedded KTX2 buffer otherwise the underlying
// ArrayBuffer may be accessed on both the worker and the main thread and
// throw an error like "Cannot perform Construct on a detached ArrayBuffer".
// Look into SharedArrayBuffer at some point to get around this.
const ktxBuffer = new Uint8Array(typedArray);
// Resolves to a CompressedTextureBuffer
return loadKTX2(ktxBuffer);
}
// Resolves to an Image or ImageBitmap
return GltfImageLoader._loadImageFromTypedArray({
uint8Array: typedArray,
format: mimeType,
flipY: false,
skipColorSpaceConversion: true,
});
}
const ktx2Regex = /(^data:image\/ktx2)|(\.ktx2$)/i;
function loadImageFromUri(resource) {
const uri = resource.getUrlComponent(false, true);
Iif (ktx2Regex.test(uri)) {
// Resolves to a CompressedTextureBuffer
return loadKTX2(resource);
}
// Resolves to an ImageBitmap or Image
return resource.fetchImage({
skipColorSpaceConversion: true,
preferImageBitmap: true,
});
}
/**
* Unloads the resource.
* @private
*/
GltfImageLoader.prototype.unload = function () {
if (
defined(this._bufferViewLoader) &&
!this._bufferViewLoader.isDestroyed()
) {
this._resourceCache.unload(this._bufferViewLoader);
}
this._bufferViewLoader = undefined;
this._uri = undefined; // Free in case the uri is a data uri
this._image = undefined;
this._mipLevels = undefined;
this._gltf = undefined;
};
// Exposed for testing
GltfImageLoader._loadImageFromTypedArray = loadImageFromTypedArray;
export default GltfImageLoader;
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