Cesium-Prequel/Source/Workers/createVectorTilePolygons.js

/* This file is automatically rebuilt by the Cesium build process. */
define(['./AttributeCompression-e3a6496c', './Cartesian2-44e93af5', './Color-a6bbb86a', './when-f31b6bd1', './IndexDatatype-e20e62f1', './Math-8c161f1c', './OrientedBoundingBox-8f3c3305', './createTaskProcessorWorker', './Check-285f6bfc', './Transforms-eb995198', './RuntimeError-c7c236f3', './WebGLConstants-34c08bc0', './EllipsoidTangentPlane-ffd45139', './IntersectionTests-db497aaf', './Plane-16f95004'], function (AttributeCompression, Cartesian2, Color, when, IndexDatatype, _Math, OrientedBoundingBox, createTaskProcessorWorker, Check, Transforms, RuntimeError, WebGLConstants, EllipsoidTangentPlane, IntersectionTests, Plane) { '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 (when.defined(minimumHeights) && when.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 Float64Array(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 (!when.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 (when.defined(minimumHeights) && when.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;

});