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ar2350
2026-04-15 17:08:39 +02:00
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node_modules/maplibre-gl/src/data/bucket/fill_extrusion_bucket.ts generated vendored Normal file
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import {FillExtrusionLayoutArray, PosArray} from '../array_types.g';
import {members as layoutAttributes, centroidAttributes} from './fill_extrusion_attributes';
import {type Segment, SegmentVector} from '../segment';
import {ProgramConfigurationSet} from '../program_configuration';
import {TriangleIndexArray} from '../index_array_type';
import {EXTENT} from '../extent';
import {VectorTileFeature} from '@mapbox/vector-tile';
import {classifyRings} from '@maplibre/maplibre-gl-style-spec';
const EARCUT_MAX_RINGS = 500;
import {register} from '../../util/web_worker_transfer';
import {hasPattern, addPatternDependencies} from './pattern_bucket_features';
import {loadGeometry} from '../load_geometry';
import {toEvaluationFeature} from '../evaluation_feature';
import {EvaluationParameters} from '../../style/evaluation_parameters';
import type {CanonicalTileID} from '../../tile/tile_id';
import type {
Bucket,
BucketParameters,
BucketFeature,
IndexedFeature,
PopulateParameters
} from '../bucket';
import type {FillExtrusionStyleLayer} from '../../style/style_layer/fill_extrusion_style_layer';
import type {Context} from '../../gl/context';
import type {IndexBuffer} from '../../gl/index_buffer';
import type {VertexBuffer} from '../../gl/vertex_buffer';
import type Point from '@mapbox/point-geometry';
import type {FeatureStates} from '../../source/source_state';
import type {ImagePosition} from '../../render/image_atlas';
import {subdividePolygon, subdivideVertexLine} from '../../render/subdivision';
import type {SubdivisionGranularitySetting} from '../../render/subdivision_granularity_settings';
import {fillLargeMeshArrays} from '../../render/fill_large_mesh_arrays';
import type {VectorTileLayerLike} from '@maplibre/vt-pbf';
const FACTOR = Math.pow(2, 13);
function addVertex(vertexArray, x, y, nx, ny, nz, t, e) {
vertexArray.emplaceBack(
// a_pos
x,
y,
// a_normal_ed: 3-component normal and 1-component edgedistance
Math.floor(nx * FACTOR) * 2 + t,
ny * FACTOR * 2,
nz * FACTOR * 2,
// edgedistance (used for wrapping patterns around extrusion sides)
Math.round(e)
);
}
type CentroidAccumulator = {
x: number;
y: number;
sampleCount: number;
};
export class FillExtrusionBucket implements Bucket {
index: number;
zoom: number;
overscaling: number;
layers: Array<FillExtrusionStyleLayer>;
layerIds: Array<string>;
stateDependentLayers: Array<FillExtrusionStyleLayer>;
stateDependentLayerIds: Array<string>;
layoutVertexArray: FillExtrusionLayoutArray;
layoutVertexBuffer: VertexBuffer;
centroidVertexArray: PosArray;
centroidVertexBuffer: VertexBuffer;
indexArray: TriangleIndexArray;
indexBuffer: IndexBuffer;
hasDependencies: boolean;
programConfigurations: ProgramConfigurationSet<FillExtrusionStyleLayer>;
segments: SegmentVector;
uploaded: boolean;
features: Array<BucketFeature>;
constructor(options: BucketParameters<FillExtrusionStyleLayer>) {
this.zoom = options.zoom;
this.overscaling = options.overscaling;
this.layers = options.layers;
this.layerIds = this.layers.map(layer => layer.id);
this.index = options.index;
this.hasDependencies = false;
this.layoutVertexArray = new FillExtrusionLayoutArray();
this.centroidVertexArray = new PosArray();
this.indexArray = new TriangleIndexArray();
this.programConfigurations = new ProgramConfigurationSet(options.layers, options.zoom);
this.segments = new SegmentVector();
this.stateDependentLayerIds = this.layers.filter((l) => l.isStateDependent()).map((l) => l.id);
}
populate(features: Array<IndexedFeature>, options: PopulateParameters, canonical: CanonicalTileID) {
this.features = [];
this.hasDependencies = hasPattern('fill-extrusion', this.layers, options);
for (const {feature, id, index, sourceLayerIndex} of features) {
const needGeometry = this.layers[0]._featureFilter.needGeometry;
const evaluationFeature = toEvaluationFeature(feature, needGeometry);
if (!this.layers[0]._featureFilter.filter(new EvaluationParameters(this.zoom), evaluationFeature, canonical)) continue;
const bucketFeature: BucketFeature = {
id,
sourceLayerIndex,
index,
geometry: needGeometry ? evaluationFeature.geometry : loadGeometry(feature),
properties: feature.properties,
type: feature.type,
patterns: {}
};
if (this.hasDependencies) {
this.features.push(addPatternDependencies('fill-extrusion', this.layers, bucketFeature, {zoom: this.zoom}, options));
} else {
this.addFeature(bucketFeature, bucketFeature.geometry, index, canonical, {}, options.subdivisionGranularity);
}
options.featureIndex.insert(feature, bucketFeature.geometry, index, sourceLayerIndex, this.index, true);
}
}
addFeatures(options: PopulateParameters, canonical: CanonicalTileID, imagePositions: {[_: string]: ImagePosition}) {
for (const feature of this.features) {
const {geometry} = feature;
this.addFeature(feature, geometry, feature.index, canonical, imagePositions, options.subdivisionGranularity);
}
}
update(states: FeatureStates, vtLayer: VectorTileLayerLike, imagePositions: {[_: string]: ImagePosition}) {
if (!this.stateDependentLayers.length) return;
this.programConfigurations.updatePaintArrays(states, vtLayer, this.stateDependentLayers, {
imagePositions
});
}
isEmpty() {
return this.layoutVertexArray.length === 0 && this.centroidVertexArray.length === 0;
}
uploadPending() {
return !this.uploaded || this.programConfigurations.needsUpload;
}
upload(context: Context) {
if (!this.uploaded) {
this.layoutVertexBuffer = context.createVertexBuffer(this.layoutVertexArray, layoutAttributes);
this.centroidVertexBuffer = context.createVertexBuffer(this.centroidVertexArray, centroidAttributes.members, true);
this.indexBuffer = context.createIndexBuffer(this.indexArray);
}
this.programConfigurations.upload(context);
this.uploaded = true;
}
destroy() {
if (!this.layoutVertexBuffer) return;
this.layoutVertexBuffer.destroy();
this.indexBuffer.destroy();
this.programConfigurations.destroy();
this.segments.destroy();
this.centroidVertexBuffer.destroy();
}
addFeature(feature: BucketFeature, geometry: Array<Array<Point>>, index: number, canonical: CanonicalTileID, imagePositions: {[_: string]: ImagePosition}, subdivisionGranularity: SubdivisionGranularitySetting) {
for (const polygon of classifyRings(geometry, EARCUT_MAX_RINGS)) {
// Compute polygon centroid to calculate elevation in GPU
const centroid: CentroidAccumulator = {x: 0, y: 0, sampleCount: 0};
const oldVertexCount = this.layoutVertexArray.length;
this.processPolygon(centroid, canonical, feature, polygon, subdivisionGranularity);
const addedVertices = this.layoutVertexArray.length - oldVertexCount;
const centroidX = Math.floor(centroid.x / centroid.sampleCount);
const centroidY = Math.floor(centroid.y / centroid.sampleCount);
for (let i = 0; i < addedVertices; i++) {
this.centroidVertexArray.emplaceBack(
centroidX,
centroidY
);
}
}
this.programConfigurations.populatePaintArrays(this.layoutVertexArray.length, feature, index, {imagePositions, canonical});
}
private processPolygon(
centroid: CentroidAccumulator,
canonical: CanonicalTileID,
feature: BucketFeature,
polygon: Array<Array<Point>>,
subdivisionGranularity: SubdivisionGranularitySetting
): void {
if (polygon.length < 1) {
return;
}
if (isEntirelyOutside(polygon[0])) {
return;
}
// Only consider the un-subdivided polygon outer ring for centroid calculation
for (const ring of polygon) {
if (ring.length === 0) {
continue;
}
// Here we don't mind if a hole ring is entirely outside, unlike when generating geometry later.
accumulatePointsToCentroid(centroid, ring);
}
const segmentReference = {
segment: this.segments.prepareSegment(4, this.layoutVertexArray, this.indexArray)
};
const granularity = subdivisionGranularity.fill.getGranularityForZoomLevel(canonical.z);
const isPolygon = VectorTileFeature.types[feature.type] === 'Polygon';
for (const ring of polygon) {
if (ring.length === 0) {
continue;
}
if (isEntirelyOutside(ring)) {
continue;
}
const subdividedRing = subdivideVertexLine(ring, granularity, isPolygon);
this._generateSideFaces(subdividedRing, segmentReference);
}
// Only triangulate and draw the area of the feature if it is a polygon
// Other feature types (e.g. LineString) do not have area, so triangulation is pointless / undefined
if (!isPolygon)
return;
// Do not generate outlines, since outlines already got subdivided earlier.
const subdividedPolygon = subdividePolygon(polygon, canonical, granularity, false);
const vertexArray = this.layoutVertexArray;
fillLargeMeshArrays(
(x, y) => {
addVertex(vertexArray, x, y, 0, 0, 1, 1, 0);
},
this.segments,
this.layoutVertexArray,
this.indexArray,
subdividedPolygon.verticesFlattened,
subdividedPolygon.indicesTriangles
);
}
/**
* Generates side faces for the supplied geometry. Assumes `geometry` to be a line string, like the output of {@link subdivideVertexLine}.
* For rings, it is assumed that the first and last vertex of `geometry` are equal.
*/
private _generateSideFaces(geometry: Array<Point>, segmentReference: {segment: Segment}) {
let edgeDistance = 0;
for (let p = 1; p < geometry.length; p++) {
const p1 = geometry[p];
const p2 = geometry[p - 1];
if (isBoundaryEdge(p1, p2)) {
continue;
}
if (segmentReference.segment.vertexLength + 4 > SegmentVector.MAX_VERTEX_ARRAY_LENGTH) {
segmentReference.segment = this.segments.prepareSegment(4, this.layoutVertexArray, this.indexArray);
}
const perp = p1.sub(p2)._perp()._unit();
const dist = p2.dist(p1);
if (edgeDistance + dist > 32768) edgeDistance = 0;
addVertex(this.layoutVertexArray, p1.x, p1.y, perp.x, perp.y, 0, 0, edgeDistance);
addVertex(this.layoutVertexArray, p1.x, p1.y, perp.x, perp.y, 0, 1, edgeDistance);
edgeDistance += dist;
addVertex(this.layoutVertexArray, p2.x, p2.y, perp.x, perp.y, 0, 0, edgeDistance);
addVertex(this.layoutVertexArray, p2.x, p2.y, perp.x, perp.y, 0, 1, edgeDistance);
const bottomRight = segmentReference.segment.vertexLength;
// ┌──────┐
// │ 0 1 │ Counter-clockwise winding order.
// │ │ Triangle 1: 0 => 2 => 1
// │ 2 3 │ Triangle 2: 1 => 2 => 3
// └──────┘
this.indexArray.emplaceBack(bottomRight, bottomRight + 2, bottomRight + 1);
this.indexArray.emplaceBack(bottomRight + 1, bottomRight + 2, bottomRight + 3);
segmentReference.segment.vertexLength += 4;
segmentReference.segment.primitiveLength += 2;
}
}
}
/**
* Accumulates geometry to centroid. Geometry can be either a polygon ring, a line string or a closed line string.
* In case of a polygon ring or line ring, the last vertex is ignored if it is the same as the first vertex.
*/
function accumulatePointsToCentroid(centroid: CentroidAccumulator, geometry: Array<Point>): void {
for (let i = 0; i < geometry.length; i++) {
const p = geometry[i];
if (i === geometry.length - 1 && geometry[0].x === p.x && geometry[0].y === p.y) {
continue;
}
centroid.x += p.x;
centroid.y += p.y;
centroid.sampleCount++;
}
}
register('FillExtrusionBucket', FillExtrusionBucket, {omit: ['layers', 'features']});
function isBoundaryEdge(p1, p2) {
return (p1.x === p2.x && (p1.x < 0 || p1.x > EXTENT)) ||
(p1.y === p2.y && (p1.y < 0 || p1.y > EXTENT));
}
function isEntirelyOutside(ring) {
return ring.every(p => p.x < 0) ||
ring.every(p => p.x > EXTENT) ||
ring.every(p => p.y < 0) ||
ring.every(p => p.y > EXTENT);
}