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import destroyObject from "../../Core/destroyObject.js";
import getImageFromTypedArray from "../../Core/getImageFromTypedArray.js";
import CesiumMath from "../../Core/Math.js";
import resizeImageToNextPowerOfTwo from "../../Core/resizeImageToNextPowerOfTwo.js";
import PixelDatatype from "../../Renderer/PixelDatatype.js";
import Texture from "../../Renderer/Texture.js";
import TextureMinificationFilter from "../../Renderer/TextureMinificationFilter.js";
import TextureWrap from "../../Renderer/TextureWrap.js";
/**
* An object to manage loading textures
*
* @alias TextureManager
* @constructor
*
* @private
* @experimental This feature is using part of the 3D Tiles spec that is not final and is subject to change without Cesium's standard deprecation policy.
*/
function TextureManager() {
this._defaultTexture = undefined;
this._textures = {};
this._loadedImages = [];
// Keep track of the last time update() was called to avoid
// calling update() twice.
this._lastUpdatedFrame = -1;
}
/**
* Get one of the loaded textures
* @param {string} textureId The unique ID of the texture loaded by {@link TextureManager#loadTexture2D}
* @return {Texture} The texture or <code>undefined</code> if no texture exists
*/
TextureManager.prototype.getTexture = function (textureId) {
return this._textures[textureId];
};
function fetchTexture2D(textureManager, textureId, textureUniform) {
textureUniform.resource
.fetchImage()
.then(function (image) {
textureManager._loadedImages.push({
id: textureId,
image: image,
textureUniform: textureUniform,
});
})
.catch(function () {
const texture = textureManager._textures[textureId];
Iif (defined(texture) && texture !== textureManager._defaultTexture) {
texture.destroy();
}
textureManager._textures[textureId] = textureManager._defaultTexture;
});
}
/**
* Load a texture 2D asynchronously. Note that {@link TextureManager#update}
* must be called in the render loop to finish processing the textures.
*
* @param {string} textureId A unique ID to identify this texture.
* @param {TextureUniform} textureUniform A description of the texture
*
* @private
*/
TextureManager.prototype.loadTexture2D = function (textureId, textureUniform) {
if (defined(textureUniform.typedArray)) {
this._loadedImages.push({
id: textureId,
textureUniform: textureUniform,
});
} else {
fetchTexture2D(this, textureId, textureUniform);
}
};
function createTexture(textureManager, loadedImage, context) {
const { id, textureUniform, image } = loadedImage;
// If the context is WebGL1, and the sampler needs mipmaps or repeating
// boundary conditions, the image may need to be resized first
const texture = context.webgl2
? getTextureAndMips(textureUniform, image, context)
: getWebGL1Texture(textureUniform, image, context);
// Destroy the old texture once the new one is loaded for more seamless
// transitions between values
const oldTexture = textureManager._textures[id];
if (defined(oldTexture) && oldTexture !== context.defaultTexture) {
oldTexture.destroy();
}
textureManager._textures[id] = texture;
}
function getTextureAndMips(textureUniform, image, context) {
const { typedArray, sampler } = textureUniform;
const texture = defined(typedArray)
? getTextureFromTypedArray(textureUniform, context)
: new Texture({ context, source: image, sampler });
if (samplerRequiresMipmap(sampler)) {
texture.generateMipmap();
}
return texture;
}
function getWebGL1Texture(textureUniform, image, context) {
const { typedArray, sampler } = textureUniform;
// WebGL1 requires power-of-two texture dimensions for mipmapping and REPEAT wrap modes
const needMipmap = samplerRequiresMipmap(sampler);
const samplerRepeats =
sampler.wrapS === TextureWrap.REPEAT ||
sampler.wrapS === TextureWrap.MIRRORED_REPEAT ||
sampler.wrapT === TextureWrap.REPEAT ||
sampler.wrapT === TextureWrap.MIRRORED_REPEAT;
const { width, height } = defined(typedArray) ? textureUniform : image;
const isPowerOfTwo = [width, height].every(CesiumMath.isPowerOfTwo);
const requiresResize = (needMipmap || samplerRepeats) && !isPowerOfTwo;
if (!requiresResize) {
return getTextureAndMips(textureUniform, image, context);
} else if (!defined(typedArray)) {
const resizedImage = resizeImageToNextPowerOfTwo(image);
return getTextureAndMips(textureUniform, resizedImage, context);
} else Eif (textureUniform.pixelDatatype === PixelDatatype.UNSIGNED_BYTE) {
const imageFromArray = getImageFromTypedArray(typedArray, width, height);
const resizedImage = resizeImageToNextPowerOfTwo(imageFromArray);
return getTextureAndMips({ sampler }, resizedImage, context);
}
// typedArray is non-power-of-two but can't be resized. Warn and return raw texture (no mipmaps)
if (needMipmap) {
console.warn(
"Texture requires resizing for mipmaps but pixelDataType cannot be resized. The texture may be rendered incorrectly.",
);
} else if (samplerRepeats) {
console.warn(
"Texture requires resizing for wrapping but pixelDataType cannot be resized. The texture may be rendered incorrectly.",
);
}
return getTextureFromTypedArray(textureUniform, context);
}
function samplerRequiresMipmap(sampler) {
return [
TextureMinificationFilter.NEAREST_MIPMAP_NEAREST,
TextureMinificationFilter.NEAREST_MIPMAP_LINEAR,
TextureMinificationFilter.LINEAR_MIPMAP_NEAREST,
TextureMinificationFilter.LINEAR_MIPMAP_LINEAR,
].includes(sampler.minificationFilter);
}
function getTextureFromTypedArray(textureUniform, context) {
const {
pixelFormat,
pixelDatatype,
width,
height,
typedArray: arrayBufferView,
sampler,
} = textureUniform;
return new Texture({
context,
pixelFormat,
pixelDatatype,
source: { arrayBufferView, width, height },
sampler,
flipY: false,
});
}
TextureManager.prototype.update = function (frameState) {
// update only needs to be called once a frame.
if (frameState.frameNumber === this._lastUpdatedFrame) {
return;
}
this._lastUpdatedFrame = frameState.frameNumber;
const context = frameState.context;
this._defaultTexture = context.defaultTexture;
// If any images were loaded since the last frame, create Textures
// for them and store in the uniform dictionary
const loadedImages = this._loadedImages;
for (let i = 0; i < loadedImages.length; i++) {
const loadedImage = loadedImages[i];
createTexture(this, loadedImage, context);
}
loadedImages.length = 0;
};
/**
* Returns true if this object was destroyed; otherwise, false.
* <br /><br />
* If this object was destroyed, it should not be used; calling any function other than
* <code>isDestroyed</code> will result in a {@link DeveloperError} exception.
*
* @returns {boolean} True if this object was destroyed; otherwise, false.
*
* @see TextureManager#destroy
* @private
*/
TextureManager.prototype.isDestroyed = function () {
return false;
};
/**
* Destroys the WebGL resources held by this object. Destroying an object allows for deterministic
* release of WebGL resources, instead of relying on the garbage collector to destroy this object.
* <br /><br />
* Once an object is destroyed, it should not be used; calling any function other than
* <code>isDestroyed</code> will result in a {@link DeveloperError} exception. Therefore,
* assign the return value (<code>undefined</code>) to the object as done in the example.
*
* @exception {DeveloperError} This object was destroyed, i.e., destroy() was called.
*
* @example
* textureManager = textureManager && textureManager.destroy();
*
* @see TextureManager#isDestroyed
* @private
*/
TextureManager.prototype.destroy = function () {
const textures = this._textures;
for (const texture in textures) {
Eif (textures.hasOwnProperty(texture)) {
const instance = textures[texture];
if (instance !== this._defaultTexture) {
instance.destroy();
}
}
}
return destroyObject(this);
};
export default TextureManager;
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