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import defined from "../Core/defined.js";
/**
* Statistics for the GPU and CPU memory used by the models loaded through the
* {@link ResourceCache}.
*
* @alias ResourceCacheStatistics
* @constructor
*
* @private
*/
function ResourceCacheStatistics() {
/**
* The size of vertex buffers and index buffers loaded in the cache in bytes.
*
* @type {number}
* @private
*/
this.geometryByteLength = 0;
/**
* The size of all textures loaded in the cache in bytes
*
* @type {number}
* @private
*/
this.texturesByteLength = 0;
// Track the sizes of resources by cache key. This is important so
// removeLoader() can decrement the counts correctly.
this._geometrySizes = {};
this._textureSizes = {};
}
/**
* Reset the memory counts
*
* @private
*/
ResourceCacheStatistics.prototype.clear = function () {
this.geometryByteLength = 0;
this.texturesByteLength = 0;
this._geometrySizes = {};
this._textureSizes = {};
};
/**
* Track the resources for a vertex or index buffer loader. This should be called after a loader is ready; that
* is it has been loaded and processed.
* This method handles the following cases gracefully:
* <ul>
* <li>If the loader is added twice, its resources will not be double-counted</li>
* <li>If the geometry has a CPU copy of the GPU buffer, it will be added to the count</li>
* </ul>
* @param {GltfVertexBufferLoader|GltfIndexBufferLoader} loader The geometry buffer with resources to track
*
* @private
*/
ResourceCacheStatistics.prototype.addGeometryLoader = function (loader) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("loader", loader);
//>>includeEnd('debug');
const cacheKey = loader.cacheKey;
// Don't double count the same resource.
if (this._geometrySizes.hasOwnProperty(cacheKey)) {
return;
}
this._geometrySizes[cacheKey] = 0;
const buffer = loader.buffer;
const typedArray = loader.typedArray;
let totalSize = 0;
if (defined(buffer)) {
totalSize += buffer.sizeInBytes;
}
if (defined(typedArray)) {
totalSize += typedArray.byteLength;
}
this.geometryByteLength += totalSize;
this._geometrySizes[cacheKey] = totalSize;
};
/**
* Track the resources for a texture loader. This should be called after a loader is ready; that
* is it has been loaded and processed.
* If the loader is added twice, its resources will not be double-counted.
*
* @param {GltfTextureLoader} loader The texture loader with resources to track
*
* @private
*/
ResourceCacheStatistics.prototype.addTextureLoader = function (loader) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("loader", loader);
//>>includeEnd('debug');
const cacheKey = loader.cacheKey;
// Don't double count the same resource.
if (this._textureSizes.hasOwnProperty(cacheKey)) {
return;
}
this._textureSizes[cacheKey] = 0;
const totalSize = loader.texture.sizeInBytes;
this.texturesByteLength += loader.texture.sizeInBytes;
this._textureSizes[cacheKey] = totalSize;
};
/**
* Remove a loader's resources from the memory count. The loader's cache key
* is used to determine information about the resource, so this method can
* be used both for geometry and textures. If the loader does not have any
* tracked resources, this is a no-op.
* @param {ResourceLoader} loader The resource loader to remove from the cache
*
* @private
*/
ResourceCacheStatistics.prototype.removeLoader = function (loader) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("loader", loader);
//>>includeEnd('debug');
const cacheKey = loader.cacheKey;
const geometrySize = this._geometrySizes[cacheKey];
delete this._geometrySizes[cacheKey];
if (defined(geometrySize)) {
this.geometryByteLength -= geometrySize;
}
const textureSize = this._textureSizes[cacheKey];
delete this._textureSizes[cacheKey];
if (defined(textureSize)) {
this.texturesByteLength -= textureSize;
}
};
export default ResourceCacheStatistics;
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