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import defined from "../Core/defined.js";
import BillboardLoadState from "./BillboardLoadState.js";
/**
* Tracks a reference to an image and it's loading state, as used in a BillboardCollection and stored in a texture atlas.
* @constructor
* @private
* @see BillboardCollection
* @see Billboard#image
* @alias BillboardTexture
* @param {BillboardCollection} billboardCollection The associated billboard collecion.
*/
function BillboardTexture(billboardCollection) {
//>>includeStart('debug', pragmas.debug);
Check.defined("billboardCollection", billboardCollection);
//>>includeEnd('debug');
this._billboardCollection = billboardCollection;
this._id = undefined;
this._loadState = BillboardLoadState.NONE;
this._loadError = undefined;
this._index = -1;
this._width = undefined;
this._height = undefined;
this._hasSubregion = false;
/**
* Used by billboardCollection to track whcih billboards to update.
* @type {boolean}
* @private
*/
this.dirty = false;
}
Object.defineProperties(BillboardTexture.prototype, {
/**
* If defined, this error was encountered during the loading process.
* @memberof BillboardTexture.prototype
* @type {Error|undefined}
* @readonly
* @private
*/
loadError: {
get: function () {
return this._loadError;
},
},
/**
* The current status of the image load. When <code>BillboardLoadState.LOADED</code>, this billboard is ready to render, i.e., the image
* has been downloaded and the WebGL resources are created.
* @memberof BillboardTexture.prototype
* @type {BillboardLoadState}
* @readonly
* @default BillboardLoadState.NONE
* @private
*/
loadState: {
get: function () {
return this._loadState;
},
},
/**
* When <code>true</code>, this texture is ready to render, i.e., the image
* has been downloaded and the WebGL resources are created.
* @memberof BillboardTexture.prototype
* @type {boolean}
* @readonly
* @default false
* @private
*/
ready: {
get: function () {
return this._loadState === BillboardLoadState.LOADED;
},
},
/**
* Returns <code>true</code> if there is image data associated with this instance.
* @memberof BillboardTexture.prototype
* @type {boolean}
* @readonly
* @private
*/
hasImage: {
get: function () {
return this._loadState !== BillboardLoadState.NONE;
},
},
/**
* A unique identifier for the image, or undefined if no image data has been associated with this instance.
* @memberof BillboardTexture.prototype
* @type {string|undefined}
* @readonly
* @private
*/
id: {
get: function () {
return this._id;
},
},
/**
* The width of the associated image. Before the instance is <code>ready</code>, this will be <code>undefined</code>.
* @memberof BillboardTexture.prototype
* @type {number|undefined}
* @readonly
* @private
*/
width: {
get: function () {
return this._width;
},
},
/**
* The height of the associated image. Before the instance is <code>ready</code>, this will be <code>undefined</code>.
* @memberof BillboardTexture.prototype
* @type {number|undefined}
* @readonly
* @private
*/
height: {
get: function () {
return this._height;
},
},
});
/**
* Releases reference to any associated image data.
* @private
*/
BillboardTexture.prototype.unload = async function () {
if (this._loadState === BillboardLoadState.NONE) {
return;
}
this._id = undefined;
this._loadError = undefined;
this._loadState = BillboardLoadState.NONE;
this._index = -1;
this._width = undefined;
this._height = undefined;
this.dirty = true;
};
/**
* Starts loading an image into the texture atlas.
* @see {TextureAtlas#addImage}
* @private
* @param {string} id An identifier to detect whether the image already exists in the atlas.
* @param {HTMLImageElement|HTMLCanvasElement|string|Resource|Promise|TextureAtlas.CreateImageCallback} image An image or canvas to add to the texture atlas,
* or a URL to an Image, or a Promise for an image, or a function that creates an image.
* @param {number} width A number specifying the width of the texture. If undefined, the image width will be used.
* @param {number} height A number specifying the height of the texture. If undefined, the image height will be used.
*/
BillboardTexture.prototype.loadImage = async function (
id,
image,
width,
height,
) {
if (this._id === id) {
// This image has already been loaded
return;
}
const collection = this._billboardCollection;
const cache = collection.billboardTextureCache;
let billboardTexture = cache.get(id);
Iif (
(defined(billboardTexture) &&
image.loadState === BillboardLoadState.LOADING) ||
image.loadState === BillboardLoadState.LOADED
) {
// Use the cached texture if it is in progress or successful.
BillboardTexture.clone(billboardTexture, this);
return;
}
// Otherwise, load if not yet assigned an image, and try the load again if anything failed during the last billboard creation
if (!defined(billboardTexture)) {
billboardTexture = new BillboardTexture(collection);
cache.set(id, billboardTexture);
}
billboardTexture._id = this._id = id;
billboardTexture._loadState = this._loadState = BillboardLoadState.LOADING;
billboardTexture._loadError = this._loadError = undefined;
let index;
const atlas = this._billboardCollection.textureAtlas;
try {
index = await atlas.addImage(id, image, width, height);
} catch (error) {
// There was an error loading the image
billboardTexture._loadState = BillboardLoadState.ERROR;
billboardTexture._loadError = error;
if (this._id !== id) {
// Another load was initiated and resolved resolved before this one. This operation is cancelled.
return;
}
this._loadState = BillboardLoadState.ERROR;
this._loadError = error;
return;
}
if (!defined(index) || index === -1) {
// Resources destroyed or otherwise
billboardTexture._loadState = BillboardLoadState.FAILED;
billboardTexture._index = -1;
if (this._id !== id) {
// Another load was initiated and resolved resolved before this one. This operation is cancelled.
return;
}
this._loadState = BillboardLoadState.FAILED;
this._index = -1;
return;
}
billboardTexture._index = index;
billboardTexture._loadState = BillboardLoadState.LOADED;
const rectangle = atlas.rectangles[index];
billboardTexture._width = rectangle.width;
billboardTexture._height = rectangle.height;
if (this._id !== id) {
// Another load was initiated and resolved resolved before this one. This operation is cancelled.
return;
}
this._index = index;
this._loadState = BillboardLoadState.LOADED;
this._width = rectangle.width;
this._height = rectangle.height;
this.dirty = true;
};
/**
* Track a reference to a sub-region of an existing image.
* @see {TextureAtlas#addImageSubRegion}
* @private
* @param {string} id An identifier to detect whether the image already exists in the atlas.
* @param {BoundingRectangle} subRegion An {@link BoundingRectangle} defining a region of an existing image, measured in pixels from the bottom-left of the image.
*/
BillboardTexture.prototype.addImageSubRegion = function (id, subRegion) {
this._id = id;
this._loadError = undefined;
this._hasSubregion = true;
const atlas = this._billboardCollection.textureAtlas;
const indexOrPromise = atlas.addImageSubRegion(id, subRegion);
if (typeof indexOrPromise === "number") {
this.setImageSubRegion(indexOrPromise, subRegion);
return;
}
this.loadImageSubRegion(id, subRegion, indexOrPromise);
};
/**
* @see {TextureAtlas#addImageSubRegion}
* @private
* @param {string} id An identifier to detect whether the image already exists in the atlas.
* @param {BoundingRectangle} subRegion An {@link BoundingRectangle} defining a region of an existing image, measured in pixels from the bottom-left of the image.
* @param {Promise<number>} indexPromise A promise that resolves to the image region index.
*/
BillboardTexture.prototype.loadImageSubRegion = async function (
id,
subRegion,
indexPromise,
) {
let index;
try {
this._loadState = BillboardLoadState.LOADING;
index = await indexPromise;
} catch (error) {
// There was an error loading the referenced image
this._loadState = BillboardLoadState.ERROR;
this._loadError = error;
return;
}
if (this._id !== id) {
// Another load was initiated and resolved resolved before this one. This operation is cancelled.
return;
}
this._loadState = BillboardLoadState.LOADED;
this.setImageSubRegion(index, subRegion);
};
/**
* @see {TextureAtlas#addImageSubRegion}
* @private
* @param {number} index The resolved index in the {@link TextureAtlas}
* @param {BoundingRectangle} subRegion An {@link BoundingRectangle} defining a region of an existing image, measured in pixels from the bottom-left of the image.
*/
BillboardTexture.prototype.setImageSubRegion = function (index, subRegion) {
if (this._index === index) {
return;
}
Iif (!defined(index) || index === -1) {
this._loadState = BillboardLoadState.FAILED;
this._index = -1;
this._width = undefined;
this._height = undefined;
return;
}
this._width = subRegion.width;
this._height = subRegion.height;
this._index = index;
this.dirty = true;
};
/**
* Get the texture coordinates for reading the loaded texture in shaders.
* @private
* @param {BoundingRectangle} [result] The modified result parameter or a new BoundingRectangle instance if one was not provided.
* @return {BoundingRectangle} The modified result parameter or a new BoundingRectangle instance if one was not provided.
*/
BillboardTexture.prototype.computeTextureCoordinates = function (result) {
const atlas = this._billboardCollection.textureAtlas;
return atlas.computeTextureCoordinates(this._index, result);
};
/**
* Clones an existing billboard texture, inlcuding any in-flight tracking, into the target billboard texture.
* @param {BillboardTexture} billboardTexture
* @param {BillboardTexture} target
* @returns {BillboardTexture} target
*/
BillboardTexture.clone = function (billboardTexture, target) {
target._id = billboardTexture._id;
target._loadState = billboardTexture._loadState;
target._loadError = undefined;
target._index = billboardTexture._index;
target._width = billboardTexture._width;
target._height = billboardTexture._height;
target._hasSubregion = billboardTexture._hasSubregion;
if (billboardTexture.ready) {
target.dirty = true;
return;
}
const completeLoad = async () => {
const id = billboardTexture._id;
const atlas = billboardTexture._billboardCollection.textureAtlas;
await atlas._indexPromiseById.get(id);
// Any errors should have already been handled
if (target._id !== id) {
// Another load was initiated and resolved resolved before this one. This operation is cancelled.
return;
}
if (billboardTexture._hasSubregion) {
// Subregions must wait an additional frame to be ready
await Promise.resolve();
}
target._id = id;
target._loadState = billboardTexture._loadState;
target._loadError = billboardTexture._loadError;
target._index = billboardTexture._index;
target._width = billboardTexture._width;
target._height = billboardTexture._height;
target.dirty = true;
};
completeLoad();
return target;
};
export default BillboardTexture;
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