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import Cartesian4 from "../Core/Cartesian4.js";
import Check from "../Core/Check.js";
import Color from "../Core/Color.js";
import createGuid from "../Core/createGuid.js";
import defined from "../Core/defined.js";
import destroyObject from "../Core/destroyObject.js";
import DeveloperError from "../Core/DeveloperError.js";
import PixelFormat from "../Core/PixelFormat.js";
import ContextLimits from "../Renderer/ContextLimits.js";
import PixelDatatype from "../Renderer/PixelDatatype.js";
import Sampler from "../Renderer/Sampler.js";
import Texture from "../Renderer/Texture.js";
/**
* An object that manages color, show/hide and picking textures for a batch
* table or feature table.
*
* @param {object} options Object with the following properties:
* @param {number} featuresLength The number of features in the batch table or feature table
* @param {Cesium3DTileContent|ModelFeatureTable} owner The owner of this batch texture. For 3D Tiles, this will be a {@link Cesium3DTileContent}. For glTF models, this will be a {@link ModelFeatureTable}.
* @param {object} [statistics] The statistics object to update with information about the batch texture.
* @param {Function} [colorChangedCallback] A callback function that is called whenever the color of a feature changes.
*
* @alias BatchTexture
* @constructor
*
* @private
*/
function BatchTexture(options) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.number("options.featuresLength", options.featuresLength);
Check.typeOf.object("options.owner", options.owner);
//>>includeEnd('debug');
this._id = createGuid();
const featuresLength = options.featuresLength;
// PERFORMANCE_IDEA: These parallel arrays probably generate cache misses in get/set color/show
// and use A LOT of memory. How can we use less memory?
this._showAlphaProperties = undefined; // [Show (0 or 255), Alpha (0 to 255)] property for each feature
this._batchValues = undefined; // Per-feature RGBA (A is based on the color's alpha and feature's show property)
this._batchValuesDirty = false;
this._batchTexture = undefined;
this._defaultTexture = undefined;
this._pickTexture = undefined;
this._pickIds = [];
// Dimensions for batch and pick textures
let textureDimensions;
let textureStep;
Eif (featuresLength > 0) {
// PERFORMANCE_IDEA: this can waste memory in the last row in the uncommon case
// when more than one row is needed (e.g., > 16K features in one tile)
const width = Math.min(featuresLength, ContextLimits.maximumTextureSize);
const height = Math.ceil(featuresLength / ContextLimits.maximumTextureSize);
const stepX = 1.0 / width;
const centerX = stepX * 0.5;
const stepY = 1.0 / height;
const centerY = stepY * 0.5;
textureDimensions = new Cartesian2(width, height);
textureStep = new Cartesian4(stepX, centerX, stepY, centerY);
}
this._translucentFeaturesLength = 0;
this._featuresLength = featuresLength;
this._textureDimensions = textureDimensions;
this._textureStep = textureStep;
this._owner = options.owner;
this._statistics = options.statistics;
this._colorChangedCallback = options.colorChangedCallback;
}
Object.defineProperties(BatchTexture.prototype, {
/**
* Number of features that are translucent
*
* @memberof BatchTexture.prototype
* @type {number}
* @readonly
* @private
*/
translucentFeaturesLength: {
get: function () {
return this._translucentFeaturesLength;
},
},
/**
* Total size of all GPU resources used by this batch texture.
*
* @memberof BatchTexture.prototype
* @type {number}
* @readonly
* @private
*/
byteLength: {
get: function () {
let memory = 0;
if (defined(this._pickTexture)) {
memory += this._pickTexture.sizeInBytes;
}
if (defined(this._batchTexture)) {
memory += this._batchTexture.sizeInBytes;
}
return memory;
},
},
/**
* Dimensions of the underlying batch texture.
*
* @memberof BatchTexture.prototype
* @type {Cartesian2}
* @readonly
* @private
*/
textureDimensions: {
get: function () {
return this._textureDimensions;
},
},
/**
* Size of each texture and distance from side to center of a texel in
* each direction. Stored as (stepX, centerX, stepY, centerY)
*
* @memberof BatchTexture.prototype
* @type {Cartesian4}
* @readonly
* @private
*/
textureStep: {
get: function () {
return this._textureStep;
},
},
/**
* The underlying texture used for styling. The texels are accessed
* by batch ID, and the value is the color of this feature after accounting
* for show/hide settings.
*
* @memberof BatchTexture.prototype
* @type {Texture}
* @readonly
* @private
*/
batchTexture: {
get: function () {
return this._batchTexture;
},
},
/**
* The default texture to use when there are no batch values
*
* @memberof BatchTexture.prototype
* @type {Texture}
* @readonly
* @private
*/
defaultTexture: {
get: function () {
return this._defaultTexture;
},
},
/**
* The underlying texture used for picking. The texels are accessed by
* batch ID, and the value is the pick color.
*
* @memberof BatchTexture.prototype
* @type {Texture}
* @readonly
* @private
*/
pickTexture: {
get: function () {
return this._pickTexture;
},
},
});
BatchTexture.DEFAULT_COLOR_VALUE = Color.WHITE;
BatchTexture.DEFAULT_SHOW_VALUE = true;
function getByteLength(batchTexture) {
const dimensions = batchTexture._textureDimensions;
return dimensions.x * dimensions.y * 4;
}
function getBatchValues(batchTexture) {
if (!defined(batchTexture._batchValues)) {
// Default batch texture to RGBA = 255: white highlight (RGB) and show/alpha = true/255 (A).
const byteLength = getByteLength(batchTexture);
const bytes = new Uint8Array(byteLength).fill(255);
batchTexture._batchValues = bytes;
}
return batchTexture._batchValues;
}
function getShowAlphaProperties(batchTexture) {
if (!defined(batchTexture._showAlphaProperties)) {
const byteLength = 2 * batchTexture._featuresLength;
const bytes = new Uint8Array(byteLength).fill(255);
// [Show = true, Alpha = 255]
batchTexture._showAlphaProperties = bytes;
}
return batchTexture._showAlphaProperties;
}
function checkBatchId(batchId, featuresLength) {
if (!defined(batchId) || batchId < 0 || batchId >= featuresLength) {
throw new DeveloperError(
`batchId is required and between zero and featuresLength - 1 (${featuresLength}` -
+").",
);
}
}
/**
* Set whether a feature is visible.
*
* @param {number} batchId the ID of the feature
* @param {boolean} show <code>true</code> if the feature should be shown, <code>false</code> otherwise
* @private
*/
BatchTexture.prototype.setShow = function (batchId, show) {
//>>includeStart('debug', pragmas.debug);
checkBatchId(batchId, this._featuresLength);
Check.typeOf.bool("show", show);
//>>includeEnd('debug');
if (show && !defined(this._showAlphaProperties)) {
// Avoid allocating since the default is show = true
return;
}
const showAlphaProperties = getShowAlphaProperties(this);
const propertyOffset = batchId * 2;
const newShow = show ? 255 : 0;
if (showAlphaProperties[propertyOffset] !== newShow) {
showAlphaProperties[propertyOffset] = newShow;
const batchValues = getBatchValues(this);
// Compute alpha used in the shader based on show and color.alpha properties
const offset = batchId * 4 + 3;
batchValues[offset] = show ? showAlphaProperties[propertyOffset + 1] : 0;
this._batchValuesDirty = true;
}
};
/**
* Set the show for all features at once.
*
* @param {boolean} show <code>true</code> if the feature should be shown, <code>false</code> otherwise
* @private
*/
BatchTexture.prototype.setAllShow = function (show) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.bool("show", show);
//>>includeEnd('debug');
const featuresLength = this._featuresLength;
for (let i = 0; i < featuresLength; ++i) {
this.setShow(i, show);
}
};
/**
* Check the current show value for a feature
*
* @param {number} batchId the ID of the feature
* @return {boolean} <code>true</code> if the feature is shown, or <code>false</code> otherwise
* @private
*/
BatchTexture.prototype.getShow = function (batchId) {
//>>includeStart('debug', pragmas.debug);
checkBatchId(batchId, this._featuresLength);
//>>includeEnd('debug');
if (!defined(this._showAlphaProperties)) {
// Avoid allocating since the default is show = true
return true;
}
const offset = batchId * 2;
return this._showAlphaProperties[offset] === 255;
};
const scratchColorBytes = new Array(4);
/**
* Set the styling color of a feature
*
* @param {number} batchId the ID of the feature
* @param {Color} color the color to assign to this feature.
*
* @private
*/
BatchTexture.prototype.setColor = function (batchId, color) {
//>>includeStart('debug', pragmas.debug);
checkBatchId(batchId, this._featuresLength);
Check.typeOf.object("color", color);
//>>includeEnd('debug');
if (
Color.equals(color, BatchTexture.DEFAULT_COLOR_VALUE) &&
!defined(this._batchValues)
) {
// Avoid allocating since the default is white
return;
}
const newColor = color.toBytes(scratchColorBytes);
const newAlpha = newColor[3];
const batchValues = getBatchValues(this);
const offset = batchId * 4;
const showAlphaProperties = getShowAlphaProperties(this);
const propertyOffset = batchId * 2;
if (
batchValues[offset] !== newColor[0] ||
batchValues[offset + 1] !== newColor[1] ||
batchValues[offset + 2] !== newColor[2] ||
showAlphaProperties[propertyOffset + 1] !== newAlpha
) {
batchValues[offset] = newColor[0];
batchValues[offset + 1] = newColor[1];
batchValues[offset + 2] = newColor[2];
const wasTranslucent = showAlphaProperties[propertyOffset + 1] !== 255;
// Compute alpha used in the shader based on show and color.alpha properties
const show = showAlphaProperties[propertyOffset] !== 0;
batchValues[offset + 3] = show ? newAlpha : 0;
showAlphaProperties[propertyOffset + 1] = newAlpha;
// Track number of translucent features so we know if this tile needs
// opaque commands, translucent commands, or both for rendering.
const isTranslucent = newAlpha !== 255;
if (isTranslucent && !wasTranslucent) {
++this._translucentFeaturesLength;
} else if (!isTranslucent && wasTranslucent) {
--this._translucentFeaturesLength;
}
this._batchValuesDirty = true;
if (defined(this._colorChangedCallback)) {
this._colorChangedCallback(batchId, color);
}
}
};
/**
* Set the styling color for all features at once
*
* @param {Color} color the color to assign to all features.
*
* @private
*/
BatchTexture.prototype.setAllColor = function (color) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("color", color);
//>>includeEnd('debug');
const featuresLength = this._featuresLength;
for (let i = 0; i < featuresLength; ++i) {
this.setColor(i, color);
}
};
/**
* Get the current color of a feature
*
* @param {number} batchId The ID of the feature
* @param {Color} result A color object where the result will be stored.
* @return {Color} The color assigned to the selected feature
*
* @private
*/
BatchTexture.prototype.getColor = function (batchId, result) {
//>>includeStart('debug', pragmas.debug);
checkBatchId(batchId, this._featuresLength);
Check.typeOf.object("result", result);
//>>includeEnd('debug');
if (!defined(this._batchValues)) {
return Color.clone(BatchTexture.DEFAULT_COLOR_VALUE, result);
}
const batchValues = this._batchValues;
const offset = batchId * 4;
const showAlphaProperties = this._showAlphaProperties;
const propertyOffset = batchId * 2;
return Color.fromBytes(
batchValues[offset],
batchValues[offset + 1],
batchValues[offset + 2],
showAlphaProperties[propertyOffset + 1],
result,
);
};
/**
* Get the pick color of a feature. This feature is an RGBA encoding of the
* pick ID.
*
* @param {number} batchId The ID of the feature
* @return {PickId} The picking color assigned to this feature
*
* @private
*/
BatchTexture.prototype.getPickColor = function (batchId) {
//>>includeStart('debug', pragmas.debug);
checkBatchId(batchId, this._featuresLength);
//>>includeEnd('debug');
return this._pickIds[batchId];
};
function createTexture(batchTexture, context, bytes) {
const dimensions = batchTexture._textureDimensions;
return new Texture({
context: context,
pixelFormat: PixelFormat.RGBA,
pixelDatatype: PixelDatatype.UNSIGNED_BYTE,
source: {
width: dimensions.x,
height: dimensions.y,
arrayBufferView: bytes,
},
flipY: false,
sampler: Sampler.NEAREST,
});
}
function createPickTexture(batchTexture, context) {
const featuresLength = batchTexture._featuresLength;
if (!defined(batchTexture._pickTexture) && featuresLength > 0) {
const pickIds = batchTexture._pickIds;
const byteLength = getByteLength(batchTexture);
const bytes = new Uint8Array(byteLength);
const owner = batchTexture._owner;
const statistics = batchTexture._statistics;
// PERFORMANCE_IDEA: we could skip the pick texture completely by allocating
// a continuous range of pickIds and then converting the base pickId + batchId
// to RGBA in the shader. The only consider is precision issues, which might
// not be an issue in WebGL 2.
for (let i = 0; i < featuresLength; ++i) {
const pickId = context.createPickId(owner.getFeature(i));
pickIds.push(pickId);
const pickColor = pickId.color;
const offset = i * 4;
bytes[offset] = Color.floatToByte(pickColor.red);
bytes[offset + 1] = Color.floatToByte(pickColor.green);
bytes[offset + 2] = Color.floatToByte(pickColor.blue);
bytes[offset + 3] = Color.floatToByte(pickColor.alpha);
}
batchTexture._pickTexture = createTexture(batchTexture, context, bytes);
// Make sure the tileset statistics are updated the frame when the pick
// texture is created.
if (defined(statistics)) {
statistics.batchTableByteLength += batchTexture._pickTexture.sizeInBytes;
}
}
}
function updateBatchTexture(batchTexture) {
const dimensions = batchTexture._textureDimensions;
// PERFORMANCE_IDEA: Instead of rewriting the entire texture, use fine-grained
// texture updates when less than, for example, 10%, of the values changed. Or
// even just optimize the common case when one feature show/color changed.
batchTexture._batchTexture.copyFrom({
source: {
width: dimensions.x,
height: dimensions.y,
arrayBufferView: batchTexture._batchValues,
},
});
}
BatchTexture.prototype.update = function (tileset, frameState) {
const context = frameState.context;
this._defaultTexture = context.defaultTexture;
const passes = frameState.passes;
if (passes.pick || passes.postProcess) {
createPickTexture(this, context);
}
if (this._batchValuesDirty) {
this._batchValuesDirty = false;
// Create batch texture on-demand
if (!defined(this._batchTexture)) {
this._batchTexture = createTexture(this, context, this._batchValues);
// Make sure the tileset statistics are updated the frame when the
// batch texture is created.
if (defined(this._statistics)) {
this._statistics.batchTableByteLength += this._batchTexture.sizeInBytes;
}
}
updateBatchTexture(this); // Apply per-feature show/color updates
}
};
/**
* Returns true if this object was destroyed; otherwise, false.
* <p>
* 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.
* </p>
*
* @returns {boolean} <code>true</code> if this object was destroyed; otherwise, <code>false</code>.
*
* @see BatchTexture#destroy
* @private
*/
BatchTexture.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.
* <p>
* 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.
* </p>
*
* @exception {DeveloperError} This object was destroyed, i.e., destroy() was called.
*
* @example
* e = e && e.destroy();
*
* @see BatchTexture#isDestroyed
* @private
*/
BatchTexture.prototype.destroy = function () {
this._batchTexture = this._batchTexture && this._batchTexture.destroy();
this._pickTexture = this._pickTexture && this._pickTexture.destroy();
const pickIds = this._pickIds;
const length = pickIds.length;
for (let i = 0; i < length; ++i) {
pickIds[i].destroy();
}
return destroyObject(this);
};
export default BatchTexture;
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