@deck.gl/experimental-layers/dist/es6/gpu-grid-layer/gpu-grid-layer.js

Experimental layers for deck.gl

// Copyright (c) 2015 - 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import '@deck.gl/core';
import { CompositeLayer, _GPUGridAggregator as GPUGridAggregator, _pointToDensityGridData as pointToDensityGridData } from '@deck.gl/core';
import GPUGridCellLayer from './gpu-grid-cell-layer';
const MINCOLOR = [0, 0, 0, 255];
const MAXCOLOR = [0, 255, 0, 255];
const defaultProps = {
  // elevation
  elevationScale: {
    type: 'number',
    min: 0,
    value: 1
  },
  // grid
  cellSize: {
    type: 'number',
    min: 0,
    max: 1000,
    value: 1000
  },
  coverage: {
    type: 'number',
    min: 0,
    max: 1,
    value: 1
  },
  getPosition: {
    type: 'accessor',
    value: x => x.position
  },
  extruded: false,
  fp64: false,
  pickable: false,
  // TODO: Enable picking with GPU Aggregation
  // Optional settings for 'lighting' shader module
  lightSettings: {},
  // GPU Aggregation
  gpuAggregation: true
};
export default class GPUGridLayer extends CompositeLayer {
  initializeState() {
    const gl = this.context.gl;
    const options = {
      id: `${this.id}-gpu-aggregator`,
      shaderCache: this.context.shaderCache
    };
    this.state = {
      gpuGridAggregator: new GPUGridAggregator(gl, options)
    };
  }

  updateState(opts) {
    const aggregationFlags = this.getAggregationFlags(opts);

    if (aggregationFlags) {
      // project data into grid cells
      this.getLayerData(aggregationFlags);
    }
  }

  getAggregationFlags(_ref) {
    let oldProps = _ref.oldProps,
        props = _ref.props,
        changeFlags = _ref.changeFlags;
    let aggregationFlags = null;

    if (changeFlags.dataChanged || oldProps.gpuAggregation !== props.gpuAggregation || changeFlags.updateTriggersChanged && (changeFlags.updateTriggersChanged.all || changeFlags.updateTriggersChanged.getPosition)) {
      aggregationFlags = Object.assign({}, aggregationFlags, {
        dataChanged: true
      });
    }

    if (oldProps.cellSize !== props.cellSize) {
      aggregationFlags = Object.assign({}, aggregationFlags, {
        cellSizeChanged: true
      });
    }

    return aggregationFlags;
  }

  getLayerData(aggregationFlags) {
    const _this$props = this.props,
          data = _this$props.data,
          cellSizeMeters = _this$props.cellSize,
          getPosition = _this$props.getPosition,
          gpuAggregation = _this$props.gpuAggregation;

    const _pointToDensityGridDa = pointToDensityGridData({
      data,
      cellSizeMeters,
      getPosition,
      gpuAggregation,
      gpuGridAggregator: this.state.gpuGridAggregator,
      boundingBox: this.state.boundingBox,
      // avoid parsing data when it is not changed.
      aggregationFlags
    }),
          countsBuffer = _pointToDensityGridDa.countsBuffer,
          maxCountBuffer = _pointToDensityGridDa.maxCountBuffer,
          gridSize = _pointToDensityGridDa.gridSize,
          gridOrigin = _pointToDensityGridDa.gridOrigin,
          cellSize = _pointToDensityGridDa.cellSize,
          boundingBox = _pointToDensityGridDa.boundingBox;

    this.setState({
      countsBuffer,
      maxCountBuffer,
      gridSize,
      gridOrigin,
      cellSize,
      boundingBox
    });
  } // for subclassing, override this method to return
  // customized sub layer props


  getSubLayerProps() {
    const _this$props2 = this.props,
          elevationScale = _this$props2.elevationScale,
          fp64 = _this$props2.fp64,
          extruded = _this$props2.extruded,
          cellSizeMeters = _this$props2.cellSize,
          coverage = _this$props2.coverage,
          lightSettings = _this$props2.lightSettings;
    const _this$state = this.state,
          countsBuffer = _this$state.countsBuffer,
          maxCountBuffer = _this$state.maxCountBuffer,
          gridSize = _this$state.gridSize,
          gridOrigin = _this$state.gridOrigin,
          cellSize = _this$state.cellSize;
    const minColor = MINCOLOR;
    const maxColor = MAXCOLOR; // return props to the sublayer constructor

    return super.getSubLayerProps({
      id: 'grid-cell',
      data: this.state.layerData,
      countsBuffer,
      maxCountBuffer,
      gridSize,
      gridOrigin,
      gridOffset: cellSize,
      numInstances: gridSize[0] * gridSize[1],
      minColor,
      maxColor,
      fp64,
      cellSize: cellSizeMeters,
      coverage,
      lightSettings,
      elevationScale,
      extruded,
      pickable: false
    });
  } // for subclassing, override this method to return
  // customized sub layer class


  getSubLayerClass() {
    return GPUGridCellLayer;
  }

  renderLayers() {
    const SubLayerClass = this.getSubLayerClass();
    return new SubLayerClass(this.getSubLayerProps());
  }

}
GPUGridLayer.layerName = 'GridLayer';
GPUGridLayer.defaultProps = defaultProps;
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