guanyun3d/public/lib/Cesium-1.99/Workers/createVectorTilePolygons.js

/**
 * @license
 * Cesium - https://github.com/CesiumGS/cesium
 * Version 1.99
 *
 * Copyright 2011-2022 Cesium Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Columbus View (Pat. Pend.)
 *
 * Portions licensed separately.
 * See https://github.com/CesiumGS/cesium/blob/main/LICENSE.md for full licensing details.
 */

define(['./AttributeCompression-53c7fda2', './Matrix3-ea964448', './Color-7ea3613e', './defaultValue-135942ca', './IndexDatatype-fa75fe25', './Math-efde0c7b', './OrientedBoundingBox-14c97a6c', './Matrix2-f9f1b94b', './createTaskProcessorWorker', './ComponentDatatype-ebdce3ba', './Check-40d84a28', './WebGLConstants-fcb70ee3', './Transforms-ac2d28a9', './combine-462d91dd', './RuntimeError-f0dada00', './EllipsoidTangentPlane-244dda7a', './AxisAlignedBoundingBox-48df2a2e', './IntersectionTests-4ab30dca', './Plane-93af52b2'], (function (AttributeCompression, Matrix3, Color, defaultValue, IndexDatatype, Math$1, OrientedBoundingBox, Matrix2, createTaskProcessorWorker, ComponentDatatype, Check, WebGLConstants, Transforms, combine, RuntimeError, EllipsoidTangentPlane, AxisAlignedBoundingBox, IntersectionTests, Plane) { 'use strict';

  const scratchCenter = new Matrix3.Cartesian3();
  const scratchEllipsoid = new Matrix3.Ellipsoid();
  const scratchRectangle = new Matrix2.Rectangle();
  const scratchScalars = {
    min: undefined,
    max: undefined,
    indexBytesPerElement: undefined,
  };

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

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

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

    Matrix3.Cartesian3.unpack(packedBuffer, offset, scratchCenter);
    offset += Matrix3.Cartesian3.packedLength;

    Matrix3.Ellipsoid.unpack(packedBuffer, offset, scratchEllipsoid);
    offset += Matrix3.Ellipsoid.packedLength;

    Matrix2.Rectangle.unpack(packedBuffer, offset, scratchRectangle);
  }

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

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

    const packedBuffer = new Float64Array(length);

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

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

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

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

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

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

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

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

    return packedBuffer;
  }

  const maxShort = 32767;

  const scratchEncodedPosition = new Matrix3.Cartesian3();
  const scratchNormal = new Matrix3.Cartesian3();
  const scratchScaledNormal = new Matrix3.Cartesian3();
  const scratchMinHeightPosition = new Matrix3.Cartesian3();
  const scratchMaxHeightPosition = new Matrix3.Cartesian3();
  const scratchBVCartographic = new Matrix3.Cartographic();
  const scratchBVRectangle = new Matrix2.Rectangle();

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

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

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

    const boundingVolumes = new Array(counts.length);

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

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

    let i;
    let j;
    let rgba;

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

    const decodedPositions = new Float64Array(positionsLength * 3);
    for (i = 0; i < positionsLength; ++i) {
      const u = uBuffer[i];
      const v = vBuffer[i];

      const x = Math$1.CesiumMath.lerp(rectangle.west, rectangle.east, u / maxShort);
      const y = Math$1.CesiumMath.lerp(rectangle.south, rectangle.north, v / maxShort);

      const cart = Matrix3.Cartographic.fromRadians(x, y, 0.0, scratchBVCartographic);
      const decodedPosition = ellipsoid.cartographicToCartesian(
        cart,
        scratchEncodedPosition
      );
      Matrix3.Cartesian3.pack(decodedPosition, decodedPositions, i * 3);
    }

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

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

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

    const colorToBuffers = {};
    for (i = 0; i < countsLength; ++i) {
      rgba = batchTableColors[i];
      if (!defaultValue.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
    let buffer;
    let byColorPositionOffset = 0;
    let byColorIndexOffset = 0;
    for (rgba in colorToBuffers) {
      if (colorToBuffers.hasOwnProperty(rgba)) {
        buffer = colorToBuffers[rgba];
        buffer.offset = byColorPositionOffset;
        buffer.indexOffset = byColorIndexOffset;

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

        byColorPositionOffset += positionLength;
        byColorIndexOffset += indexLength;

        buffer.indexLength = indexLength;
      }
    }

    const 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];
      const positionOffset = buffer.offset;
      let positionIndex = positionOffset * 3;
      let batchIdIndex = positionOffset;

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

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

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

      for (j = 0; j < polygonCount; ++j) {
        const position = Matrix3.Cartesian3.unpack(
          decodedPositions,
          polygonOffset * 3 + j * 3,
          scratchEncodedPosition
        );
        ellipsoid.scaleToGeodeticSurface(position, position);

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

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

        const normal = ellipsoid.geodeticSurfaceNormal(position, scratchNormal);
        let scaledNormal = Matrix3.Cartesian3.multiplyByScalar(
          normal,
          polygonMinimumHeight,
          scratchScaledNormal
        );
        const minHeightPosition = Matrix3.Cartesian3.add(
          position,
          scaledNormal,
          scratchMinHeightPosition
        );

        scaledNormal = Matrix3.Cartesian3.multiplyByScalar(
          normal,
          polygonMaximumHeight,
          scaledNormal
        );
        const maxHeightPosition = Matrix3.Cartesian3.add(
          position,
          scaledNormal,
          scratchMaxHeightPosition
        );

        Matrix3.Cartesian3.subtract(maxHeightPosition, center, maxHeightPosition);
        Matrix3.Cartesian3.subtract(minHeightPosition, center, minHeightPosition);

        Matrix3.Cartesian3.pack(maxHeightPosition, batchedPositions, positionIndex);
        Matrix3.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
      );

      let indicesIndex = buffer.indexOffset;

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

      batchedIndexOffsets[i] = indicesIndex;

      for (j = 0; j < indexCount; j += 3) {
        const i0 = indices[indexOffset + j] - polygonOffset;
        const i1 = indices[indexOffset + j + 1] - polygonOffset;
        const 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) {
        const v0 = j;
        const 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
    );

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

    const indexDatatype =
      batchedIndices.BYTES_PER_ELEMENT === 2
        ? IndexDatatype.IndexDatatype.UNSIGNED_SHORT
        : IndexDatatype.IndexDatatype.UNSIGNED_INT;
    const 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;

}));