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import Color from "../Core/Color.js";
import ComponentDatatype from "../Core/ComponentDatatype.js";
import defined from "../Core/defined.js";
import destroyObject from "../Core/destroyObject.js";
import Ellipsoid from "../Core/Ellipsoid.js";
import FeatureDetection from "../Core/FeatureDetection.js";
import IndexDatatype from "../Core/IndexDatatype.js";
import Matrix4 from "../Core/Matrix4.js";
import Rectangle from "../Core/Rectangle.js";
import TaskProcessor from "../Core/TaskProcessor.js";
import Buffer from "../Renderer/Buffer.js";
import BufferUsage from "../Renderer/BufferUsage.js";
import DrawCommand from "../Renderer/DrawCommand.js";
import Pass from "../Renderer/Pass.js";
import RenderState from "../Renderer/RenderState.js";
import ShaderProgram from "../Renderer/ShaderProgram.js";
import ShaderSource from "../Renderer/ShaderSource.js";
import VertexArray from "../Renderer/VertexArray.js";
import PolylineCommon from "../Shaders/PolylineCommon.js";
import Vector3DTilePolylinesVS from "../Shaders/Vector3DTilePolylinesVS.js";
import BlendingState from "./BlendingState.js";
import Cesium3DTileFeature from "./Cesium3DTileFeature.js";
/**
* Creates a batch of polylines that have been subdivided to be draped on terrain.
*
* @alias Vector3DTilePolylines
* @constructor
*
* @param {object} options An object with following properties:
* @param {Uint16Array} options.positions The positions of the polylines
* @param {Uint32Array} options.counts The number or positions in the each polyline.
* @param {Uint16Array} options.widths The width of each polyline.
* @param {number} options.minimumHeight The minimum height of the terrain covered by the tile.
* @param {number} options.maximumHeight The maximum height of the terrain covered by the tile.
* @param {Rectangle} options.rectangle The rectangle containing the tile.
* @param {Cartesian3} [options.center=Cartesian3.ZERO] The RTC center.
* @param {Cesium3DTileBatchTable} options.batchTable The batch table for the tile containing the batched polylines.
* @param {Uint16Array} options.batchIds The batch ids for each polyline.
* @param {BoundingSphere} options.boundingVolume The bounding volume for the entire batch of polylines.
* @param {boolean} options.keepDecodedPositions Whether to keep decoded positions in memory.
*
* @private
*/
function Vector3DTilePolylines(options) {
// these arrays are all released after the first update.
this._positions = options.positions;
this._widths = options.widths;
this._counts = options.counts;
this._batchIds = options.batchIds;
this._ellipsoid = options.ellipsoid ?? Ellipsoid.WGS84;
this._minimumHeight = options.minimumHeight;
this._maximumHeight = options.maximumHeight;
this._center = options.center;
this._rectangle = options.rectangle;
this._boundingVolume = options.boundingVolume;
this._batchTable = options.batchTable;
this._va = undefined;
this._sp = undefined;
this._rs = undefined;
this._uniformMap = undefined;
this._command = undefined;
this._transferrableBatchIds = undefined;
this._packedBuffer = undefined;
this._keepDecodedPositions = options.keepDecodedPositions;
this._decodedPositions = undefined;
this._decodedPositionOffsets = undefined;
this._currentPositions = undefined;
this._previousPositions = undefined;
this._nextPositions = undefined;
this._expandAndWidth = undefined;
this._vertexBatchIds = undefined;
this._indices = undefined;
this._constantColor = Color.clone(Color.WHITE);
this._highlightColor = this._constantColor;
this._trianglesLength = 0;
this._geometryByteLength = 0;
this._ready = false;
this._promise = undefined;
this._error = undefined;
}
Object.defineProperties(Vector3DTilePolylines.prototype, {
/**
* Gets the number of triangles.
*
* @memberof Vector3DTilePolylines.prototype
*
* @type {number}
* @readonly
* @private
*/
trianglesLength: {
get: function () {
return this._trianglesLength;
},
},
/**
* Gets the geometry memory in bytes.
*
* @memberof Vector3DTilePolylines.prototype
*
* @type {number}
* @readonly
* @private
*/
geometryByteLength: {
get: function () {
return this._geometryByteLength;
},
},
/**
* Returns true when the primitive is ready to render.
* @memberof Vector3DTilePolylines.prototype
* @type {boolean}
* @readonly
* @private
*/
ready: {
get: function () {
return this._ready;
},
},
});
function packBuffer(polylines) {
const rectangle = polylines._rectangle;
const minimumHeight = polylines._minimumHeight;
const maximumHeight = polylines._maximumHeight;
const ellipsoid = polylines._ellipsoid;
const center = polylines._center;
const packedLength =
2 +
Rectangle.packedLength +
Ellipsoid.packedLength +
Cartesian3.packedLength;
const packedBuffer = new Float64Array(packedLength);
let offset = 0;
packedBuffer[offset++] = minimumHeight;
packedBuffer[offset++] = maximumHeight;
Rectangle.pack(rectangle, packedBuffer, offset);
offset += Rectangle.packedLength;
Ellipsoid.pack(ellipsoid, packedBuffer, offset);
offset += Ellipsoid.packedLength;
Cartesian3.pack(center, packedBuffer, offset);
return packedBuffer;
}
const createVerticesTaskProcessor = new TaskProcessor(
"createVectorTilePolylines",
5,
);
const attributeLocations = {
previousPosition: 0,
currentPosition: 1,
nextPosition: 2,
expandAndWidth: 3,
a_batchId: 4,
};
function createVertexArray(polylines, context) {
Iif (defined(polylines._va)) {
return;
}
let positions = polylines._positions;
let widths = polylines._widths;
let counts = polylines._counts;
let batchIds = polylines._transferrableBatchIds;
let packedBuffer = polylines._packedBuffer;
Eif (!defined(packedBuffer)) {
// Copy because they may be the views on the same buffer.
positions = polylines._positions = positions.slice();
widths = polylines._widths = widths.slice();
counts = polylines._counts = counts.slice();
batchIds = polylines._transferrableBatchIds = polylines._batchIds.slice();
packedBuffer = polylines._packedBuffer = packBuffer(polylines);
}
const transferrableObjects = [
positions.buffer,
widths.buffer,
counts.buffer,
batchIds.buffer,
packedBuffer.buffer,
];
const parameters = {
positions: positions.buffer,
widths: widths.buffer,
counts: counts.buffer,
batchIds: batchIds.buffer,
packedBuffer: packedBuffer.buffer,
keepDecodedPositions: polylines._keepDecodedPositions,
};
const verticesPromise = createVerticesTaskProcessor.scheduleTask(
parameters,
transferrableObjects,
);
Iif (!defined(verticesPromise)) {
// Postponed
return;
}
return verticesPromise
.then(function (result) {
Iif (polylines.isDestroyed()) {
return;
}
if (polylines._keepDecodedPositions) {
polylines._decodedPositions = new Float64Array(result.decodedPositions);
polylines._decodedPositionOffsets = new Uint32Array(
result.decodedPositionOffsets,
);
}
polylines._currentPositions = new Float32Array(result.currentPositions);
polylines._previousPositions = new Float32Array(result.previousPositions);
polylines._nextPositions = new Float32Array(result.nextPositions);
polylines._expandAndWidth = new Float32Array(result.expandAndWidth);
polylines._vertexBatchIds = new Uint16Array(result.batchIds);
const indexDatatype = result.indexDatatype;
polylines._indices =
indexDatatype === IndexDatatype.UNSIGNED_SHORT
? new Uint16Array(result.indices)
: new Uint32Array(result.indices);
finishVertexArray(polylines, context);
polylines._ready = true;
})
.catch((error) => {
if (polylines.isDestroyed()) {
return;
}
// Throw the error next frame
polylines._error = error;
});
}
function finishVertexArray(polylines, context) {
Eif (!defined(polylines._va)) {
const curPositions = polylines._currentPositions;
const prevPositions = polylines._previousPositions;
const nextPositions = polylines._nextPositions;
const expandAndWidth = polylines._expandAndWidth;
const vertexBatchIds = polylines._vertexBatchIds;
const indices = polylines._indices;
let byteLength =
prevPositions.byteLength +
curPositions.byteLength +
nextPositions.byteLength;
byteLength +=
expandAndWidth.byteLength +
vertexBatchIds.byteLength +
indices.byteLength;
polylines._trianglesLength = indices.length / 3;
polylines._geometryByteLength = byteLength;
const prevPositionBuffer = Buffer.createVertexBuffer({
context: context,
typedArray: prevPositions,
usage: BufferUsage.STATIC_DRAW,
});
const curPositionBuffer = Buffer.createVertexBuffer({
context: context,
typedArray: curPositions,
usage: BufferUsage.STATIC_DRAW,
});
const nextPositionBuffer = Buffer.createVertexBuffer({
context: context,
typedArray: nextPositions,
usage: BufferUsage.STATIC_DRAW,
});
const expandAndWidthBuffer = Buffer.createVertexBuffer({
context: context,
typedArray: expandAndWidth,
usage: BufferUsage.STATIC_DRAW,
});
const idBuffer = Buffer.createVertexBuffer({
context: context,
typedArray: vertexBatchIds,
usage: BufferUsage.STATIC_DRAW,
});
const indexBuffer = Buffer.createIndexBuffer({
context: context,
typedArray: indices,
usage: BufferUsage.STATIC_DRAW,
indexDatatype:
indices.BYTES_PER_ELEMENT === 2
? IndexDatatype.UNSIGNED_SHORT
: IndexDatatype.UNSIGNED_INT,
});
const vertexAttributes = [
{
index: attributeLocations.previousPosition,
vertexBuffer: prevPositionBuffer,
componentDatatype: ComponentDatatype.FLOAT,
componentsPerAttribute: 3,
},
{
index: attributeLocations.currentPosition,
vertexBuffer: curPositionBuffer,
componentDatatype: ComponentDatatype.FLOAT,
componentsPerAttribute: 3,
},
{
index: attributeLocations.nextPosition,
vertexBuffer: nextPositionBuffer,
componentDatatype: ComponentDatatype.FLOAT,
componentsPerAttribute: 3,
},
{
index: attributeLocations.expandAndWidth,
vertexBuffer: expandAndWidthBuffer,
componentDatatype: ComponentDatatype.FLOAT,
componentsPerAttribute: 2,
},
{
index: attributeLocations.a_batchId,
vertexBuffer: idBuffer,
componentDatatype: ComponentDatatype.UNSIGNED_SHORT,
componentsPerAttribute: 1,
},
];
polylines._va = new VertexArray({
context: context,
attributes: vertexAttributes,
indexBuffer: indexBuffer,
});
polylines._positions = undefined;
polylines._widths = undefined;
polylines._counts = undefined;
polylines._ellipsoid = undefined;
polylines._minimumHeight = undefined;
polylines._maximumHeight = undefined;
polylines._rectangle = undefined;
polylines._transferrableBatchIds = undefined;
polylines._packedBuffer = undefined;
polylines._currentPositions = undefined;
polylines._previousPositions = undefined;
polylines._nextPositions = undefined;
polylines._expandAndWidth = undefined;
polylines._vertexBatchIds = undefined;
polylines._indices = undefined;
}
}
const modifiedModelViewScratch = new Matrix4();
const rtcScratch = new Cartesian3();
function createUniformMap(primitive, context) {
if (defined(primitive._uniformMap)) {
return;
}
primitive._uniformMap = {
u_modifiedModelView: function () {
const viewMatrix = context.uniformState.view;
Matrix4.clone(viewMatrix, modifiedModelViewScratch);
Matrix4.multiplyByPoint(
modifiedModelViewScratch,
primitive._center,
rtcScratch,
);
Matrix4.setTranslation(
modifiedModelViewScratch,
rtcScratch,
modifiedModelViewScratch,
);
return modifiedModelViewScratch;
},
u_highlightColor: function () {
return primitive._highlightColor;
},
};
}
function createRenderStates(primitive) {
if (defined(primitive._rs)) {
return;
}
const polygonOffset = {
enabled: true,
factor: -5.0,
units: -5.0,
};
primitive._rs = RenderState.fromCache({
blending: BlendingState.ALPHA_BLEND,
depthMask: false,
depthTest: {
enabled: true,
},
polygonOffset: polygonOffset,
});
}
const PolylineFS =
"uniform vec4 u_highlightColor; \n" +
"void main()\n" +
"{\n" +
" out_FragColor = u_highlightColor;\n" +
"}\n";
function createShaders(primitive, context) {
if (defined(primitive._sp)) {
return;
}
const batchTable = primitive._batchTable;
const vsSource = batchTable.getVertexShaderCallback(
false,
"a_batchId",
undefined,
)(Vector3DTilePolylinesVS);
const fsSource = batchTable.getFragmentShaderCallback(
false,
undefined,
false,
)(PolylineFS);
const vs = new ShaderSource({
defines: [
"VECTOR_TILE",
!FeatureDetection.isInternetExplorer() ? "CLIP_POLYLINE" : "",
],
sources: [PolylineCommon, vsSource],
});
const fs = new ShaderSource({
defines: ["VECTOR_TILE"],
sources: [fsSource],
});
primitive._sp = ShaderProgram.fromCache({
context: context,
vertexShaderSource: vs,
fragmentShaderSource: fs,
attributeLocations: attributeLocations,
});
}
function queueCommands(primitive, frameState) {
if (!defined(primitive._command)) {
const uniformMap = primitive._batchTable.getUniformMapCallback()(
primitive._uniformMap,
);
primitive._command = new DrawCommand({
owner: primitive,
vertexArray: primitive._va,
renderState: primitive._rs,
shaderProgram: primitive._sp,
uniformMap: uniformMap,
boundingVolume: primitive._boundingVolume,
pass: Pass.TRANSLUCENT,
pickId: primitive._batchTable.getPickId(),
});
}
frameState.commandList.push(primitive._command);
}
Vector3DTilePolylines.getPolylinePositions = function (polylines, batchId) {
const batchIds = polylines._batchIds;
const positions = polylines._decodedPositions;
const offsets = polylines._decodedPositionOffsets;
if (!defined(batchIds) || !defined(positions)) {
return undefined;
}
let i;
let j;
const polylinesLength = batchIds.length;
let positionsLength = 0;
let resultCounter = 0;
for (i = 0; i < polylinesLength; ++i) {
if (batchIds[i] === batchId) {
positionsLength += offsets[i + 1] - offsets[i];
}
}
if (positionsLength === 0) {
return undefined;
}
const results = new Float64Array(positionsLength * 3);
for (i = 0; i < polylinesLength; ++i) {
if (batchIds[i] === batchId) {
const offset = offsets[i];
const count = offsets[i + 1] - offset;
for (j = 0; j < count; ++j) {
const decodedOffset = (offset + j) * 3;
results[resultCounter++] = positions[decodedOffset];
results[resultCounter++] = positions[decodedOffset + 1];
results[resultCounter++] = positions[decodedOffset + 2];
}
}
}
return results;
};
/**
* Get the polyline positions for the given feature.
*
* @param {number} batchId The batch ID of the feature.
*/
Vector3DTilePolylines.prototype.getPositions = function (batchId) {
return Vector3DTilePolylines.getPolylinePositions(this, batchId);
};
/**
* Creates features for each polyline and places it at the batch id index of features.
*
* @param {Vector3DTileContent} content The vector tile content.
* @param {Cesium3DTileFeature[]} features An array of features where the polygon features will be placed.
*/
Vector3DTilePolylines.prototype.createFeatures = function (content, features) {
const batchIds = this._batchIds;
const length = batchIds.length;
for (let i = 0; i < length; ++i) {
const batchId = batchIds[i];
features[batchId] = new Cesium3DTileFeature(content, batchId);
}
};
/**
* Colors the entire tile when enabled is true. The resulting color will be (polyline batch table color * color).
*
* @param {boolean} enabled Whether to enable debug coloring.
* @param {Color} color The debug color.
*/
Vector3DTilePolylines.prototype.applyDebugSettings = function (enabled, color) {
this._highlightColor = enabled ? color : this._constantColor;
};
function clearStyle(polygons, features) {
const batchIds = polygons._batchIds;
const length = batchIds.length;
for (let i = 0; i < length; ++i) {
const batchId = batchIds[i];
const feature = features[batchId];
feature.show = true;
feature.color = Color.WHITE;
}
}
const scratchColor = new Color();
const DEFAULT_COLOR_VALUE = Color.WHITE;
const DEFAULT_SHOW_VALUE = true;
/**
* Apply a style to the content.
*
* @param {Cesium3DTileStyle} style The style.
* @param {Cesium3DTileFeature[]} features The array of features.
*/
Vector3DTilePolylines.prototype.applyStyle = function (style, features) {
if (!defined(style)) {
clearStyle(this, features);
return;
}
const batchIds = this._batchIds;
const length = batchIds.length;
for (let i = 0; i < length; ++i) {
const batchId = batchIds[i];
const feature = features[batchId];
feature.color = defined(style.color)
? style.color.evaluateColor(feature, scratchColor)
: DEFAULT_COLOR_VALUE;
feature.show = defined(style.show)
? style.show.evaluate(feature)
: DEFAULT_SHOW_VALUE;
}
};
/**
* Updates the batches and queues the commands for rendering.
*
* @param {FrameState} frameState The current frame state.
*/
Vector3DTilePolylines.prototype.update = function (frameState) {
const context = frameState.context;
if (!this._ready) {
if (!defined(this._promise)) {
this._promise = createVertexArray(this, context);
}
Iif (defined(this._error)) {
const error = this._error;
this._error = undefined;
throw error;
}
return;
}
createUniformMap(this, context);
createShaders(this, context);
createRenderStates(this);
const passes = frameState.passes;
if (passes.render || passes.pick) {
queueCommands(this, frameState);
}
};
/**
* 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>.
*/
Vector3DTilePolylines.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.
*/
Vector3DTilePolylines.prototype.destroy = function () {
this._va = this._va && this._va.destroy();
this._sp = this._sp && this._sp.destroy();
return destroyObject(this);
};
export default Vector3DTilePolylines;
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