cesiumDemo/Source/Workers/createVectorTilePolygons.js

/* This file is automatically rebuilt by the Cesium build process. */
define(['./defined-26bd4a03', './Check-da037458', './freezeObject-2d83f591', './defaultValue-f2e68450', './Math-fa6e45cb', './Cartesian2-2a723276', './defineProperties-6f7a50f2', './Transforms-65aba0a4', './RuntimeError-ad75c885', './WebGLConstants-497deb20', './when-ee12a2cb', './AttributeCompression-87682214', './IndexDatatype-3de60176', './IntersectionTests-c2360ffa', './Plane-a1a3fd52', './createTaskProcessorWorker', './EllipsoidTangentPlane-10c6053a', './OrientedBoundingBox-a786ab5d', './Color-63c0bcb4'], function (defined, Check, freezeObject, defaultValue, _Math, Cartesian2, defineProperties, Transforms, RuntimeError, WebGLConstants, when, AttributeCompression, IndexDatatype, IntersectionTests, Plane, createTaskProcessorWorker, EllipsoidTangentPlane, OrientedBoundingBox, Color) { 'use strict';

    var scratchCenter = new Cartesian2.Cartesian3();
        var scratchEllipsoid = new Cartesian2.Ellipsoid();
        var scratchRectangle = new Cartesian2.Rectangle();
        var scratchScalars = {
            min : undefined,
            max : undefined,
            indexBytesPerElement : undefined
        };

        function unpackBuffer(buffer) {
            var packedBuffer = new Float64Array(buffer);

            var offset = 0;
            scratchScalars.indexBytesPerElement = packedBuffer[offset++];

            scratchScalars.min = packedBuffer[offset++];
            scratchScalars.max = packedBuffer[offset++];

            Cartesian2.Cartesian3.unpack(packedBuffer, offset, scratchCenter);
            offset += Cartesian2.Cartesian3.packedLength;

            Cartesian2.Ellipsoid.unpack(packedBuffer, offset, scratchEllipsoid);
            offset += Cartesian2.Ellipsoid.packedLength;

            Cartesian2.Rectangle.unpack(packedBuffer, offset, scratchRectangle);
        }

        function packedBatchedIndicesLength(batchedIndices) {
            var length = batchedIndices.length;
            var count = 0;
            for (var i = 0; i < length; ++i) {
                count += Color.Color.packedLength + 3 + batchedIndices[i].batchIds.length;
            }
            return count;
        }

        function packBuffer(indexDatatype, boundingVolumes, batchedIndices) {
            var numBVs = boundingVolumes.length;
            var length = 1 + 1 + numBVs * OrientedBoundingBox.OrientedBoundingBox.packedLength + 1 + packedBatchedIndicesLength(batchedIndices);

            var packedBuffer = new Float64Array(length);

            var offset = 0;
            packedBuffer[offset++] = indexDatatype;
            packedBuffer[offset++] = numBVs;

            for (var i = 0; i < numBVs; ++i) {
                OrientedBoundingBox.OrientedBoundingBox.pack(boundingVolumes[i], packedBuffer, offset);
                offset += OrientedBoundingBox.OrientedBoundingBox.packedLength;
            }

            var indicesLength = batchedIndices.length;
            packedBuffer[offset++] = indicesLength;

            for (var j = 0; j < indicesLength; ++j) {
                var batchedIndex = batchedIndices[j];

                Color.Color.pack(batchedIndex.color, packedBuffer, offset);
                offset += Color.Color.packedLength;

                packedBuffer[offset++] = batchedIndex.offset;
                packedBuffer[offset++] = batchedIndex.count;

                var batchIds = batchedIndex.batchIds;
                var batchIdsLength = batchIds.length;
                packedBuffer[offset++] = batchIdsLength;

                for (var k = 0; k < batchIdsLength; ++k) {
                    packedBuffer[offset++] = batchIds[k];
                }
            }

            return packedBuffer;
        }

        var maxShort = 32767;

        var scratchEncodedPosition = new Cartesian2.Cartesian3();
        var scratchNormal = new Cartesian2.Cartesian3();
        var scratchScaledNormal = new Cartesian2.Cartesian3();
        var scratchMinHeightPosition = new Cartesian2.Cartesian3();
        var scratchMaxHeightPosition = new Cartesian2.Cartesian3();
        var scratchBVCartographic = new Cartesian2.Cartographic();
        var scratchBVRectangle = new Cartesian2.Rectangle();

        function createVectorTilePolygons(parameters, transferableObjects) {
            unpackBuffer(parameters.packedBuffer);

            var indices;
            var indexBytesPerElement = scratchScalars.indexBytesPerElement;
            if (indexBytesPerElement === 2) {
                indices = new Uint16Array(parameters.indices);
            } else {
                indices = new Uint32Array(parameters.indices);
            }

            var positions = new Uint16Array(parameters.positions);
            var counts = new Uint32Array(parameters.counts);
            var indexCounts = new Uint32Array(parameters.indexCounts);
            var batchIds = new Uint32Array(parameters.batchIds);
            var batchTableColors = new Uint32Array(parameters.batchTableColors);

            var boundingVolumes = new Array(counts.length);

            var center = scratchCenter;
            var ellipsoid = scratchEllipsoid;
            var rectangle = scratchRectangle;
            var minHeight = scratchScalars.min;
            var maxHeight = scratchScalars.max;

            var minimumHeights = parameters.minimumHeights;
            var maximumHeights = parameters.maximumHeights;
            if (defined.defined(minimumHeights) && defined.defined(maximumHeights)) {
                minimumHeights = new Float32Array(minimumHeights);
                maximumHeights = new Float32Array(maximumHeights);
            }

            var i;
            var j;
            var rgba;

            var positionsLength = positions.length / 2;
            var uBuffer = positions.subarray(0, positionsLength);
            var vBuffer = positions.subarray(positionsLength, 2 * positionsLength);
            AttributeCompression.AttributeCompression.zigZagDeltaDecode(uBuffer, vBuffer);

            var decodedPositions = new Float32Array(positionsLength * 3);
            for (i = 0; i < positionsLength; ++i) {
                var u = uBuffer[i];
                var v = vBuffer[i];

                var x = _Math.CesiumMath.lerp(rectangle.west, rectangle.east, u / maxShort);
                var y = _Math.CesiumMath.lerp(rectangle.south, rectangle.north, v / maxShort);

                var cart = Cartesian2.Cartographic.fromRadians(x, y, 0.0, scratchBVCartographic);
                var decodedPosition = ellipsoid.cartographicToCartesian(cart, scratchEncodedPosition);
                Cartesian2.Cartesian3.pack(decodedPosition, decodedPositions, i * 3);
            }

            var countsLength = counts.length;
            var offsets = new Array(countsLength);
            var indexOffsets = new Array(countsLength);
            var currentOffset = 0;
            var currentIndexOffset = 0;
            for (i = 0; i < countsLength; ++i) {
                offsets[i] = currentOffset;
                indexOffsets[i] = currentIndexOffset;

                currentOffset += counts[i];
                currentIndexOffset += indexCounts[i];
            }

            var batchedPositions = new Float32Array(positionsLength * 3 * 2);
            var batchedIds = new Uint16Array(positionsLength * 2);
            var batchedIndexOffsets = new Uint32Array(indexOffsets.length);
            var batchedIndexCounts = new Uint32Array(indexCounts.length);
            var batchedIndices = [];

            var colorToBuffers = {};
            for (i = 0; i < countsLength; ++i) {
                rgba = batchTableColors[i];
                if (!defined.defined(colorToBuffers[rgba])) {
                    colorToBuffers[rgba] = {
                        positionLength : counts[i],
                        indexLength : indexCounts[i],
                        offset : 0,
                        indexOffset : 0,
                        batchIds : [i]
                    };
                } else {
                    colorToBuffers[rgba].positionLength += counts[i];
                    colorToBuffers[rgba].indexLength += indexCounts[i];
                    colorToBuffers[rgba].batchIds.push(i);
                }
            }

            // get the offsets and counts for the positions and indices of each primitive
            var buffer;
            var byColorPositionOffset = 0;
            var byColorIndexOffset = 0;
            for (rgba in colorToBuffers) {
                if (colorToBuffers.hasOwnProperty(rgba)) {
                    buffer = colorToBuffers[rgba];
                    buffer.offset = byColorPositionOffset;
                    buffer.indexOffset = byColorIndexOffset;

                    var positionLength = buffer.positionLength * 2;
                    var indexLength = buffer.indexLength * 2 + buffer.positionLength * 6;

                    byColorPositionOffset += positionLength;
                    byColorIndexOffset += indexLength;

                    buffer.indexLength = indexLength;
                }
            }

            var batchedDrawCalls = [];

            for (rgba in colorToBuffers) {
                if (colorToBuffers.hasOwnProperty(rgba)) {
                    buffer = colorToBuffers[rgba];

                    batchedDrawCalls.push({
                        color : Color.Color.fromRgba(parseInt(rgba)),
                        offset : buffer.indexOffset,
                        count : buffer.indexLength,
                        batchIds : buffer.batchIds
                    });
                }
            }

            for (i = 0; i < countsLength; ++i) {
                rgba = batchTableColors[i];

                buffer = colorToBuffers[rgba];
                var positionOffset = buffer.offset;
                var positionIndex = positionOffset * 3;
                var batchIdIndex = positionOffset;

                var polygonOffset = offsets[i];
                var polygonCount = counts[i];
                var batchId = batchIds[i];

                var polygonMinimumHeight = minHeight;
                var polygonMaximumHeight = maxHeight;
                if (defined.defined(minimumHeights) && defined.defined(maximumHeights)) {
                    polygonMinimumHeight = minimumHeights[i];
                    polygonMaximumHeight = maximumHeights[i];
                }

                var minLat = Number.POSITIVE_INFINITY;
                var maxLat = Number.NEGATIVE_INFINITY;
                var minLon = Number.POSITIVE_INFINITY;
                var maxLon = Number.NEGATIVE_INFINITY;

                for (j = 0; j < polygonCount; ++j) {
                    var position = Cartesian2.Cartesian3.unpack(decodedPositions, polygonOffset * 3 + j * 3, scratchEncodedPosition);
                    ellipsoid.scaleToGeodeticSurface(position, position);

                    var carto = ellipsoid.cartesianToCartographic(position, scratchBVCartographic);
                    var lat = carto.latitude;
                    var lon = carto.longitude;

                    minLat = Math.min(lat, minLat);
                    maxLat = Math.max(lat, maxLat);
                    minLon = Math.min(lon, minLon);
                    maxLon = Math.max(lon, maxLon);

                    var normal = ellipsoid.geodeticSurfaceNormal(position, scratchNormal);
                    var scaledNormal = Cartesian2.Cartesian3.multiplyByScalar(normal, polygonMinimumHeight, scratchScaledNormal);
                    var minHeightPosition = Cartesian2.Cartesian3.add(position, scaledNormal, scratchMinHeightPosition);

                    scaledNormal = Cartesian2.Cartesian3.multiplyByScalar(normal, polygonMaximumHeight, scaledNormal);
                    var maxHeightPosition = Cartesian2.Cartesian3.add(position, scaledNormal, scratchMaxHeightPosition);

                    Cartesian2.Cartesian3.subtract(maxHeightPosition, center, maxHeightPosition);
                    Cartesian2.Cartesian3.subtract(minHeightPosition, center, minHeightPosition);

                    Cartesian2.Cartesian3.pack(maxHeightPosition, batchedPositions, positionIndex);
                    Cartesian2.Cartesian3.pack(minHeightPosition, batchedPositions, positionIndex + 3);

                    batchedIds[batchIdIndex] = batchId;
                    batchedIds[batchIdIndex + 1] = batchId;

                    positionIndex += 6;
                    batchIdIndex += 2;
                }

                rectangle = scratchBVRectangle;
                rectangle.west = minLon;
                rectangle.east = maxLon;
                rectangle.south = minLat;
                rectangle.north = maxLat;

                boundingVolumes[i] = OrientedBoundingBox.OrientedBoundingBox.fromRectangle(rectangle, minHeight, maxHeight, ellipsoid);

                var indicesIndex = buffer.indexOffset;

                var indexOffset = indexOffsets[i];
                var indexCount = indexCounts[i];

                batchedIndexOffsets[i] = indicesIndex;

                for (j = 0; j < indexCount; j += 3) {
                    var i0 = indices[indexOffset + j] - polygonOffset;
                    var i1 = indices[indexOffset + j + 1] - polygonOffset;
                    var i2 = indices[indexOffset + j + 2] - polygonOffset;

                    // triangle on the top of the extruded polygon
                    batchedIndices[indicesIndex++] = i0 * 2 + positionOffset;
                    batchedIndices[indicesIndex++] = i1 * 2 + positionOffset;
                    batchedIndices[indicesIndex++] = i2 * 2 + positionOffset;

                    // triangle on the bottom of the extruded polygon
                    batchedIndices[indicesIndex++] = i2 * 2 + 1 + positionOffset;
                    batchedIndices[indicesIndex++] = i1 * 2 + 1 + positionOffset;
                    batchedIndices[indicesIndex++] = i0 * 2 + 1 + positionOffset;
                }

                // indices for the walls of the extruded polygon
                for (j = 0; j < polygonCount; ++j) {
                    var v0 = j;
                    var v1 = (j + 1) % polygonCount;

                    batchedIndices[indicesIndex++] = v0 * 2 + 1 + positionOffset;
                    batchedIndices[indicesIndex++] = v1 * 2 + positionOffset;
                    batchedIndices[indicesIndex++] = v0 * 2 + positionOffset;

                    batchedIndices[indicesIndex++] = v0 * 2 + 1 + positionOffset;
                    batchedIndices[indicesIndex++] = v1 * 2 + 1 + positionOffset;
                    batchedIndices[indicesIndex++] = v1 * 2 + positionOffset;
                }

                buffer.offset += polygonCount * 2;
                buffer.indexOffset = indicesIndex;

                batchedIndexCounts[i] = indicesIndex - batchedIndexOffsets[i];
            }

            batchedIndices = IndexDatatype.IndexDatatype.createTypedArray(batchedPositions.length / 3, batchedIndices);

            var batchedIndicesLength = batchedDrawCalls.length;
            for (var m = 0; m < batchedIndicesLength; ++m) {
                var tempIds = batchedDrawCalls[m].batchIds;
                var count = 0;
                var tempIdsLength = tempIds.length;
                for (var n = 0; n < tempIdsLength; ++n) {
                    count += batchedIndexCounts[tempIds[n]];
                }
                batchedDrawCalls[m].count = count;
            }

            var indexDatatype = (batchedIndices.BYTES_PER_ELEMENT === 2) ?  IndexDatatype.IndexDatatype.UNSIGNED_SHORT : IndexDatatype.IndexDatatype.UNSIGNED_INT;
            var packedBuffer = packBuffer(indexDatatype, boundingVolumes, batchedDrawCalls);

            transferableObjects.push(batchedPositions.buffer, batchedIndices.buffer, batchedIndexOffsets.buffer, batchedIndexCounts.buffer, batchedIds.buffer, packedBuffer.buffer);

            return {
                positions : batchedPositions.buffer,
                indices : batchedIndices.buffer,
                indexOffsets : batchedIndexOffsets.buffer,
                indexCounts : batchedIndexCounts.buffer,
                batchIds : batchedIds.buffer,
                packedBuffer : packedBuffer.buffer
            };
        }
    var createVectorTilePolygons$1 = createTaskProcessorWorker(createVectorTilePolygons);

    return createVectorTilePolygons$1;

});