474 lines
20 KiB
JavaScript
474 lines
20 KiB
JavaScript
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define([
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'../Core/AxisAlignedBoundingBox',
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'../Core/BoundingSphere',
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'../Core/Cartesian2',
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'../Core/Cartesian3',
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'../Core/Cartographic',
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'../Core/defaultValue',
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'../Core/defined',
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'../Core/Ellipsoid',
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'../Core/EllipsoidalOccluder',
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'../Core/Math',
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'../Core/Matrix4',
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'../Core/OrientedBoundingBox',
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'../Core/Rectangle',
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'../Core/RuntimeError',
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'../Core/TerrainEncoding',
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'../Core/Transforms',
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'../Core/WebMercatorProjection',
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'./createTaskProcessorWorker'
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], function(
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AxisAlignedBoundingBox,
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BoundingSphere,
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Cartesian2,
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Cartesian3,
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Cartographic,
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defaultValue,
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defined,
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Ellipsoid,
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EllipsoidalOccluder,
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CesiumMath,
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Matrix4,
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OrientedBoundingBox,
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Rectangle,
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RuntimeError,
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TerrainEncoding,
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Transforms,
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WebMercatorProjection,
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createTaskProcessorWorker) {
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'use strict';
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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(parameters, transferableObjects) {
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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(parameters.buffer, parameters.relativeToCenter, parameters.ellipsoid,
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parameters.rectangle, parameters.nativeRectangle, parameters.exaggeration, parameters.skirtHeight,
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parameters.includeWebMercatorT, parameters.negativeAltitudeExponentBias, parameters.negativeElevationThreshold);
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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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skirtIndex : statistics.skirtIndex
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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(buffer, relativeToCenter, ellipsoid, rectangle, nativeRectangle, exaggeration, skirtHeight, includeWebMercatorT, negativeAltitudeExponentBias, negativeElevationThreshold) {
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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(geographicSouth);
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oneOverMercatorHeight = 1.0 / (WebMercatorProjection.geodeticLatitudeToMercatorAngle(geographicNorth) - 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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// Height is stored in units of (1/EarthRadius) or (1/6371010.0)
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var height = dv.getFloat32(offset, true) * 6371010.0;
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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 < negativeElevationThreshold) {
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height *= negativeAltitudeExponentBias;
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}
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height *= 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 (indexOfEpsilon(quadBorderLongitudes, longitude) !== -1 ||
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indexOfEpsilon(quadBorderLatitudes, latitude) !== -1) {
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var index = indexOfEpsilon(quadBorderPoints, scratchCartographic, Cartographic);
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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] = (WebMercatorProjection.geodeticLatitudeToMercatorAngle(latitude) - southMercatorY) * 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 = (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 skirtIndex = 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(positions, heights, uvs, webMercatorTs, indices, skirtOptions,
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westBorder, -percentage * rectangleWidth, true, -percentage * rectangleHeight);
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addSkirt(positions, heights, uvs, webMercatorTs, indices, skirtOptions,
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southBorder, -percentage * rectangleHeight, false);
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addSkirt(positions, heights, uvs, webMercatorTs, indices, skirtOptions,
|
||
|
|
eastBorder, percentage * rectangleWidth, true, percentage * rectangleHeight);
|
||
|
|
addSkirt(positions, heights, uvs, webMercatorTs, indices, skirtOptions,
|
||
|
|
northBorder, percentage * rectangleHeight, false);
|
||
|
|
|
||
|
|
// Since the corner between the north and west sides is in the west array, generate the last
|
||
|
|
// two triangles between the last north vertex and the first west vertex
|
||
|
|
if (westBorder.length > 0 && northBorder.length > 0) {
|
||
|
|
var firstBorderIndex = westBorder[0].index;
|
||
|
|
var firstSkirtIndex = vertexCountWithoutSkirts;
|
||
|
|
var lastBorderIndex = northBorder[northBorder.length - 1].index;
|
||
|
|
var lastSkirtIndex = positions.length - 1;
|
||
|
|
|
||
|
|
indices.push(lastBorderIndex, lastSkirtIndex, firstSkirtIndex, firstSkirtIndex, firstBorderIndex, lastBorderIndex);
|
||
|
|
}
|
||
|
|
|
||
|
|
size = positions.length; // Get new size with skirt vertices
|
||
|
|
|
||
|
|
var boundingSphere3D = BoundingSphere.fromPoints(positions);
|
||
|
|
var orientedBoundingBox;
|
||
|
|
if (defined(rectangle) && rectangle.width < CesiumMath.PI_OVER_TWO + CesiumMath.EPSILON5) {
|
||
|
|
// Here, rectangle.width < pi/2, and rectangle.height < pi
|
||
|
|
// (though it would still work with rectangle.width up to pi)
|
||
|
|
orientedBoundingBox = OrientedBoundingBox.fromRectangle(rectangle, minHeight, maxHeight, ellipsoid);
|
||
|
|
}
|
||
|
|
|
||
|
|
var occluder = new EllipsoidalOccluder(ellipsoid);
|
||
|
|
var occludeePointInScaledSpace = occluder.computeHorizonCullingPoint(relativeToCenter, positions);
|
||
|
|
|
||
|
|
var aaBox = new AxisAlignedBoundingBox(minimum, maximum, relativeToCenter);
|
||
|
|
var encoding = new TerrainEncoding(aaBox, skirtOptions.hMin, maxHeight, fromENU, false, includeWebMercatorT);
|
||
|
|
var vertices = new Float32Array(size * encoding.getStride());
|
||
|
|
|
||
|
|
var bufferIndex = 0;
|
||
|
|
for (var k = 0; k < size; ++k) {
|
||
|
|
bufferIndex = encoding.encode(vertices, bufferIndex, positions[k], uvs[k], heights[k], undefined, webMercatorTs[k]);
|
||
|
|
}
|
||
|
|
|
||
|
|
return {
|
||
|
|
vertices : vertices,
|
||
|
|
indices : new Uint16Array(indices),
|
||
|
|
maximumHeight : maxHeight,
|
||
|
|
minimumHeight : minHeight,
|
||
|
|
encoding : encoding,
|
||
|
|
boundingSphere3D : boundingSphere3D,
|
||
|
|
orientedBoundingBox : orientedBoundingBox,
|
||
|
|
occludeePointInScaledSpace : occludeePointInScaledSpace,
|
||
|
|
vertexCountWithoutSkirts : vertexCountWithoutSkirts,
|
||
|
|
skirtIndex : skirtIndex
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return createTaskProcessorWorker(createVerticesFromGoogleEarthEnterpriseBuffer);
|
||
|
|
});
|