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622 lines
18 KiB
JavaScript
622 lines
18 KiB
JavaScript
import AxisAlignedBoundingBox from "../Core/AxisAlignedBoundingBox.js";
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import BoundingSphere from "../Core/BoundingSphere.js";
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import Cartesian2 from "../Core/Cartesian2.js";
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import Cartesian3 from "../Core/Cartesian3.js";
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import Cartographic from "../Core/Cartographic.js";
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import defaultValue from "../Core/defaultValue.js";
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import defined from "../Core/defined.js";
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import Ellipsoid from "../Core/Ellipsoid.js";
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import EllipsoidalOccluder from "../Core/EllipsoidalOccluder.js";
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import CesiumMath from "../Core/Math.js";
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import Matrix4 from "../Core/Matrix4.js";
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import OrientedBoundingBox from "../Core/OrientedBoundingBox.js";
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import Rectangle from "../Core/Rectangle.js";
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import RuntimeError from "../Core/RuntimeError.js";
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import TerrainEncoding from "../Core/TerrainEncoding.js";
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import Transforms from "../Core/Transforms.js";
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import WebMercatorProjection from "../Core/WebMercatorProjection.js";
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import createTaskProcessorWorker from "./createTaskProcessorWorker.js";
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var sizeOfUint16 = Uint16Array.BYTES_PER_ELEMENT;
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var sizeOfInt32 = Int32Array.BYTES_PER_ELEMENT;
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var sizeOfUint32 = Uint32Array.BYTES_PER_ELEMENT;
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var sizeOfFloat = Float32Array.BYTES_PER_ELEMENT;
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var sizeOfDouble = Float64Array.BYTES_PER_ELEMENT;
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function indexOfEpsilon(arr, elem, elemType) {
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elemType = defaultValue(elemType, CesiumMath);
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var count = arr.length;
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for (var i = 0; i < count; ++i) {
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if (elemType.equalsEpsilon(arr[i], elem, CesiumMath.EPSILON12)) {
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return i;
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}
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}
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return -1;
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}
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function createVerticesFromGoogleEarthEnterpriseBuffer(
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parameters,
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transferableObjects
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) {
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parameters.ellipsoid = Ellipsoid.clone(parameters.ellipsoid);
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parameters.rectangle = Rectangle.clone(parameters.rectangle);
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var statistics = processBuffer(
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parameters.buffer,
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parameters.relativeToCenter,
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parameters.ellipsoid,
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parameters.rectangle,
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parameters.nativeRectangle,
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parameters.exaggeration,
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parameters.skirtHeight,
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parameters.includeWebMercatorT,
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parameters.negativeAltitudeExponentBias,
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parameters.negativeElevationThreshold
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);
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var vertices = statistics.vertices;
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transferableObjects.push(vertices.buffer);
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var indices = statistics.indices;
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transferableObjects.push(indices.buffer);
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return {
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vertices: vertices.buffer,
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indices: indices.buffer,
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numberOfAttributes: statistics.encoding.getStride(),
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minimumHeight: statistics.minimumHeight,
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maximumHeight: statistics.maximumHeight,
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boundingSphere3D: statistics.boundingSphere3D,
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orientedBoundingBox: statistics.orientedBoundingBox,
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occludeePointInScaledSpace: statistics.occludeePointInScaledSpace,
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encoding: statistics.encoding,
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vertexCountWithoutSkirts: statistics.vertexCountWithoutSkirts,
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indexCountWithoutSkirts: statistics.indexCountWithoutSkirts,
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westIndicesSouthToNorth: statistics.westIndicesSouthToNorth,
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southIndicesEastToWest: statistics.southIndicesEastToWest,
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eastIndicesNorthToSouth: statistics.eastIndicesNorthToSouth,
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northIndicesWestToEast: statistics.northIndicesWestToEast,
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};
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}
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var scratchCartographic = new Cartographic();
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var scratchCartesian = new Cartesian3();
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var minimumScratch = new Cartesian3();
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var maximumScratch = new Cartesian3();
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var matrix4Scratch = new Matrix4();
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function processBuffer(
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buffer,
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relativeToCenter,
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ellipsoid,
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rectangle,
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nativeRectangle,
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exaggeration,
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skirtHeight,
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includeWebMercatorT,
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negativeAltitudeExponentBias,
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negativeElevationThreshold
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) {
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var geographicWest;
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var geographicSouth;
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var geographicEast;
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var geographicNorth;
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var rectangleWidth, rectangleHeight;
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if (!defined(rectangle)) {
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geographicWest = CesiumMath.toRadians(nativeRectangle.west);
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geographicSouth = CesiumMath.toRadians(nativeRectangle.south);
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geographicEast = CesiumMath.toRadians(nativeRectangle.east);
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geographicNorth = CesiumMath.toRadians(nativeRectangle.north);
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rectangleWidth = CesiumMath.toRadians(rectangle.width);
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rectangleHeight = CesiumMath.toRadians(rectangle.height);
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} else {
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geographicWest = rectangle.west;
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geographicSouth = rectangle.south;
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geographicEast = rectangle.east;
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geographicNorth = rectangle.north;
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rectangleWidth = rectangle.width;
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rectangleHeight = rectangle.height;
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}
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// Keep track of quad borders so we can remove duplicates around the borders
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var quadBorderLatitudes = [geographicSouth, geographicNorth];
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var quadBorderLongitudes = [geographicWest, geographicEast];
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var fromENU = Transforms.eastNorthUpToFixedFrame(relativeToCenter, ellipsoid);
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var toENU = Matrix4.inverseTransformation(fromENU, matrix4Scratch);
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var southMercatorY;
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var oneOverMercatorHeight;
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if (includeWebMercatorT) {
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southMercatorY = WebMercatorProjection.geodeticLatitudeToMercatorAngle(
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geographicSouth
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);
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oneOverMercatorHeight =
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1.0 /
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(WebMercatorProjection.geodeticLatitudeToMercatorAngle(geographicNorth) -
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southMercatorY);
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}
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var dv = new DataView(buffer);
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var minHeight = Number.POSITIVE_INFINITY;
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var maxHeight = Number.NEGATIVE_INFINITY;
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var minimum = minimumScratch;
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minimum.x = Number.POSITIVE_INFINITY;
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minimum.y = Number.POSITIVE_INFINITY;
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minimum.z = Number.POSITIVE_INFINITY;
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var maximum = maximumScratch;
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maximum.x = Number.NEGATIVE_INFINITY;
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maximum.y = Number.NEGATIVE_INFINITY;
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maximum.z = Number.NEGATIVE_INFINITY;
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// Compute sizes
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var offset = 0;
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var size = 0;
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var indicesSize = 0;
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var quadSize;
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var quad;
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for (quad = 0; quad < 4; ++quad) {
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var o = offset;
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quadSize = dv.getUint32(o, true);
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o += sizeOfUint32;
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var x = CesiumMath.toRadians(dv.getFloat64(o, true) * 180.0);
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o += sizeOfDouble;
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if (indexOfEpsilon(quadBorderLongitudes, x) === -1) {
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quadBorderLongitudes.push(x);
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}
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var y = CesiumMath.toRadians(dv.getFloat64(o, true) * 180.0);
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o += sizeOfDouble;
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if (indexOfEpsilon(quadBorderLatitudes, y) === -1) {
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quadBorderLatitudes.push(y);
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}
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o += 2 * sizeOfDouble; // stepX + stepY
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var c = dv.getInt32(o, true); // Read point count
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o += sizeOfInt32;
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size += c;
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c = dv.getInt32(o, true); // Read index count
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indicesSize += c * 3;
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offset += quadSize + sizeOfUint32; // Jump to next quad
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}
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// Quad Border points to remove duplicates
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var quadBorderPoints = [];
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var quadBorderIndices = [];
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// Create arrays
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var positions = new Array(size);
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var uvs = new Array(size);
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var heights = new Array(size);
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var webMercatorTs = includeWebMercatorT ? new Array(size) : [];
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var indices = new Array(indicesSize);
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// Points are laid out in rows starting at SW, so storing border points as we
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// come across them all points will be adjacent.
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var westBorder = [];
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var southBorder = [];
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var eastBorder = [];
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var northBorder = [];
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// Each tile is split into 4 parts
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var pointOffset = 0;
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var indicesOffset = 0;
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offset = 0;
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for (quad = 0; quad < 4; ++quad) {
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quadSize = dv.getUint32(offset, true);
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offset += sizeOfUint32;
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var startQuad = offset;
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var originX = CesiumMath.toRadians(dv.getFloat64(offset, true) * 180.0);
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offset += sizeOfDouble;
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var originY = CesiumMath.toRadians(dv.getFloat64(offset, true) * 180.0);
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offset += sizeOfDouble;
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var stepX = CesiumMath.toRadians(dv.getFloat64(offset, true) * 180.0);
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var halfStepX = stepX * 0.5;
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offset += sizeOfDouble;
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var stepY = CesiumMath.toRadians(dv.getFloat64(offset, true) * 180.0);
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var halfStepY = stepY * 0.5;
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offset += sizeOfDouble;
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var numPoints = dv.getInt32(offset, true);
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offset += sizeOfInt32;
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var numFaces = dv.getInt32(offset, true);
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offset += sizeOfInt32;
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//var level = dv.getInt32(offset, true);
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offset += sizeOfInt32;
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// Keep track of quad indices to overall tile indices
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var indicesMapping = new Array(numPoints);
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for (var i = 0; i < numPoints; ++i) {
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var longitude = originX + dv.getUint8(offset++) * stepX;
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scratchCartographic.longitude = longitude;
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var latitude = originY + dv.getUint8(offset++) * stepY;
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scratchCartographic.latitude = latitude;
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var height = dv.getFloat32(offset, true);
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offset += sizeOfFloat;
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// In order to support old clients, negative altitude values are stored as
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// height/-2^32. Old clients see the value as really close to 0 but new clients multiply
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// by -2^32 to get the real negative altitude value.
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if (height !== 0 && height < negativeElevationThreshold) {
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height *= -Math.pow(2, negativeAltitudeExponentBias);
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}
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// Height is stored in units of (1/EarthRadius) or (1/6371010.0)
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height *= 6371010.0 * exaggeration;
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scratchCartographic.height = height;
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// Is it along a quad border - if so check if already exists and use that index
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if (
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indexOfEpsilon(quadBorderLongitudes, longitude) !== -1 ||
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indexOfEpsilon(quadBorderLatitudes, latitude) !== -1
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) {
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var index = indexOfEpsilon(
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quadBorderPoints,
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scratchCartographic,
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Cartographic
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);
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if (index === -1) {
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quadBorderPoints.push(Cartographic.clone(scratchCartographic));
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quadBorderIndices.push(pointOffset);
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} else {
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indicesMapping[i] = quadBorderIndices[index];
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continue;
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}
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}
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indicesMapping[i] = pointOffset;
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if (Math.abs(longitude - geographicWest) < halfStepX) {
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westBorder.push({
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index: pointOffset,
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cartographic: Cartographic.clone(scratchCartographic),
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});
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} else if (Math.abs(longitude - geographicEast) < halfStepX) {
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eastBorder.push({
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index: pointOffset,
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cartographic: Cartographic.clone(scratchCartographic),
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});
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} else if (Math.abs(latitude - geographicSouth) < halfStepY) {
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southBorder.push({
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index: pointOffset,
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cartographic: Cartographic.clone(scratchCartographic),
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});
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} else if (Math.abs(latitude - geographicNorth) < halfStepY) {
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northBorder.push({
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index: pointOffset,
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cartographic: Cartographic.clone(scratchCartographic),
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});
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}
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minHeight = Math.min(height, minHeight);
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maxHeight = Math.max(height, maxHeight);
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heights[pointOffset] = height;
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var pos = ellipsoid.cartographicToCartesian(scratchCartographic);
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positions[pointOffset] = pos;
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if (includeWebMercatorT) {
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webMercatorTs[pointOffset] =
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(WebMercatorProjection.geodeticLatitudeToMercatorAngle(latitude) -
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southMercatorY) *
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oneOverMercatorHeight;
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}
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Matrix4.multiplyByPoint(toENU, pos, scratchCartesian);
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Cartesian3.minimumByComponent(scratchCartesian, minimum, minimum);
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Cartesian3.maximumByComponent(scratchCartesian, maximum, maximum);
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var u = (longitude - geographicWest) / (geographicEast - geographicWest);
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u = CesiumMath.clamp(u, 0.0, 1.0);
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var v =
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(latitude - geographicSouth) / (geographicNorth - geographicSouth);
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v = CesiumMath.clamp(v, 0.0, 1.0);
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uvs[pointOffset] = new Cartesian2(u, v);
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++pointOffset;
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}
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var facesElementCount = numFaces * 3;
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for (var j = 0; j < facesElementCount; ++j, ++indicesOffset) {
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indices[indicesOffset] = indicesMapping[dv.getUint16(offset, true)];
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offset += sizeOfUint16;
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}
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if (quadSize !== offset - startQuad) {
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throw new RuntimeError("Invalid terrain tile.");
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}
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}
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positions.length = pointOffset;
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uvs.length = pointOffset;
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heights.length = pointOffset;
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if (includeWebMercatorT) {
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webMercatorTs.length = pointOffset;
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}
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var vertexCountWithoutSkirts = pointOffset;
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var indexCountWithoutSkirts = indicesOffset;
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// Add skirt points
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var skirtOptions = {
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hMin: minHeight,
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lastBorderPoint: undefined,
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skirtHeight: skirtHeight,
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toENU: toENU,
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ellipsoid: ellipsoid,
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minimum: minimum,
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maximum: maximum,
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};
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// Sort counter clockwise from NW corner
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// Corner points are in the east/west arrays
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westBorder.sort(function (a, b) {
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return b.cartographic.latitude - a.cartographic.latitude;
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});
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southBorder.sort(function (a, b) {
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return a.cartographic.longitude - b.cartographic.longitude;
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});
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eastBorder.sort(function (a, b) {
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return a.cartographic.latitude - b.cartographic.latitude;
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});
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northBorder.sort(function (a, b) {
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return b.cartographic.longitude - a.cartographic.longitude;
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});
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var percentage = 0.00001;
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addSkirt(
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positions,
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heights,
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uvs,
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webMercatorTs,
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indices,
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skirtOptions,
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westBorder,
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-percentage * rectangleWidth,
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true,
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-percentage * rectangleHeight
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);
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addSkirt(
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positions,
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heights,
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uvs,
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webMercatorTs,
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indices,
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skirtOptions,
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southBorder,
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-percentage * rectangleHeight,
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false
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);
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addSkirt(
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positions,
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heights,
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uvs,
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webMercatorTs,
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indices,
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skirtOptions,
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eastBorder,
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percentage * rectangleWidth,
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true,
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percentage * rectangleHeight
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);
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addSkirt(
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positions,
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heights,
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uvs,
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webMercatorTs,
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indices,
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skirtOptions,
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northBorder,
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percentage * rectangleHeight,
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false
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);
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// Since the corner between the north and west sides is in the west array, generate the last
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// two triangles between the last north vertex and the first west vertex
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if (westBorder.length > 0 && northBorder.length > 0) {
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var firstBorderIndex = westBorder[0].index;
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var firstSkirtIndex = vertexCountWithoutSkirts;
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var lastBorderIndex = northBorder[northBorder.length - 1].index;
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var lastSkirtIndex = positions.length - 1;
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indices.push(
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lastBorderIndex,
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lastSkirtIndex,
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firstSkirtIndex,
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firstSkirtIndex,
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firstBorderIndex,
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lastBorderIndex
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);
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}
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size = positions.length; // Get new size with skirt vertices
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var boundingSphere3D = BoundingSphere.fromPoints(positions);
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var orientedBoundingBox;
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if (defined(rectangle)) {
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orientedBoundingBox = OrientedBoundingBox.fromRectangle(
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rectangle,
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minHeight,
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maxHeight,
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ellipsoid
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);
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}
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var occluder = new EllipsoidalOccluder(ellipsoid);
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var occludeePointInScaledSpace = occluder.computeHorizonCullingPointPossiblyUnderEllipsoid(
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relativeToCenter,
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positions,
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minHeight
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);
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var aaBox = new AxisAlignedBoundingBox(minimum, maximum, relativeToCenter);
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var encoding = new TerrainEncoding(
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aaBox,
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skirtOptions.hMin,
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maxHeight,
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fromENU,
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false,
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includeWebMercatorT
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);
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var vertices = new Float32Array(size * encoding.getStride());
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var bufferIndex = 0;
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for (var k = 0; k < size; ++k) {
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bufferIndex = encoding.encode(
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vertices,
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bufferIndex,
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positions[k],
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uvs[k],
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heights[k],
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undefined,
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webMercatorTs[k]
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);
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}
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var westIndicesSouthToNorth = westBorder
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.map(function (vertex) {
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return vertex.index;
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})
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.reverse();
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var southIndicesEastToWest = southBorder
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.map(function (vertex) {
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return vertex.index;
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})
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.reverse();
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var eastIndicesNorthToSouth = eastBorder
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.map(function (vertex) {
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return vertex.index;
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})
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.reverse();
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var northIndicesWestToEast = northBorder
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.map(function (vertex) {
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return vertex.index;
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})
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.reverse();
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southIndicesEastToWest.unshift(
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eastIndicesNorthToSouth[eastIndicesNorthToSouth.length - 1]
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);
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southIndicesEastToWest.push(westIndicesSouthToNorth[0]);
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northIndicesWestToEast.unshift(
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westIndicesSouthToNorth[westIndicesSouthToNorth.length - 1]
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);
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northIndicesWestToEast.push(eastIndicesNorthToSouth[0]);
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return {
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vertices: vertices,
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indices: new Uint16Array(indices),
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maximumHeight: maxHeight,
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minimumHeight: minHeight,
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encoding: encoding,
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boundingSphere3D: boundingSphere3D,
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|
orientedBoundingBox: orientedBoundingBox,
|
|
occludeePointInScaledSpace: occludeePointInScaledSpace,
|
|
vertexCountWithoutSkirts: vertexCountWithoutSkirts,
|
|
indexCountWithoutSkirts: indexCountWithoutSkirts,
|
|
westIndicesSouthToNorth: westIndicesSouthToNorth,
|
|
southIndicesEastToWest: southIndicesEastToWest,
|
|
eastIndicesNorthToSouth: eastIndicesNorthToSouth,
|
|
northIndicesWestToEast: northIndicesWestToEast,
|
|
};
|
|
}
|
|
|
|
function addSkirt(
|
|
positions,
|
|
heights,
|
|
uvs,
|
|
webMercatorTs,
|
|
indices,
|
|
skirtOptions,
|
|
borderPoints,
|
|
fudgeFactor,
|
|
eastOrWest,
|
|
cornerFudge
|
|
) {
|
|
var count = borderPoints.length;
|
|
for (var j = 0; j < count; ++j) {
|
|
var borderPoint = borderPoints[j];
|
|
var borderCartographic = borderPoint.cartographic;
|
|
var borderIndex = borderPoint.index;
|
|
var currentIndex = positions.length;
|
|
|
|
var longitude = borderCartographic.longitude;
|
|
var latitude = borderCartographic.latitude;
|
|
latitude = CesiumMath.clamp(
|
|
latitude,
|
|
-CesiumMath.PI_OVER_TWO,
|
|
CesiumMath.PI_OVER_TWO
|
|
); // Don't go over the poles
|
|
var height = borderCartographic.height - skirtOptions.skirtHeight;
|
|
skirtOptions.hMin = Math.min(skirtOptions.hMin, height);
|
|
|
|
Cartographic.fromRadians(longitude, latitude, height, scratchCartographic);
|
|
|
|
// Adjust sides to angle out
|
|
if (eastOrWest) {
|
|
scratchCartographic.longitude += fudgeFactor;
|
|
}
|
|
|
|
// Adjust top or bottom to angle out
|
|
// Since corners are in the east/west arrays angle the first and last points as well
|
|
if (!eastOrWest) {
|
|
scratchCartographic.latitude += fudgeFactor;
|
|
} else if (j === count - 1) {
|
|
scratchCartographic.latitude += cornerFudge;
|
|
} else if (j === 0) {
|
|
scratchCartographic.latitude -= cornerFudge;
|
|
}
|
|
|
|
var pos = skirtOptions.ellipsoid.cartographicToCartesian(
|
|
scratchCartographic
|
|
);
|
|
positions.push(pos);
|
|
heights.push(height);
|
|
uvs.push(Cartesian2.clone(uvs[borderIndex])); // Copy UVs from border point
|
|
if (webMercatorTs.length > 0) {
|
|
webMercatorTs.push(webMercatorTs[borderIndex]);
|
|
}
|
|
|
|
Matrix4.multiplyByPoint(skirtOptions.toENU, pos, scratchCartesian);
|
|
|
|
var minimum = skirtOptions.minimum;
|
|
var maximum = skirtOptions.maximum;
|
|
Cartesian3.minimumByComponent(scratchCartesian, minimum, minimum);
|
|
Cartesian3.maximumByComponent(scratchCartesian, maximum, maximum);
|
|
|
|
var lastBorderPoint = skirtOptions.lastBorderPoint;
|
|
if (defined(lastBorderPoint)) {
|
|
var lastBorderIndex = lastBorderPoint.index;
|
|
indices.push(
|
|
lastBorderIndex,
|
|
currentIndex - 1,
|
|
currentIndex,
|
|
currentIndex,
|
|
borderIndex,
|
|
lastBorderIndex
|
|
);
|
|
}
|
|
|
|
skirtOptions.lastBorderPoint = borderPoint;
|
|
}
|
|
}
|
|
export default createTaskProcessorWorker(
|
|
createVerticesFromGoogleEarthEnterpriseBuffer
|
|
);
|