src/buffer/hyperballstick-buffer.js

/**
 * @file Hyperball Stick Buffer
 * @author Alexander Rose <alexander.rose@weirdbyte.de>
 * @private
 */

import { ExtensionFragDepth } from '../globals.js'
import { calculateMinArray } from '../math/array-utils.js'
import CylinderGeometryBuffer from './cylindergeometry-buffer.js'
import HyperballStickImpostorBuffer from './hyperballstickimpostor-buffer.js'

/**
 * Hyperball stick buffer. Depending on the value {@link ExtensionFragDepth} and
 * `params.disableImpostor` the constructor returns either a
 * {@link CylinderGeometryBuffer} or a {@link HyperballStickImpostorBuffer}
 * @implements {Buffer}
 *
 * @example
 * var hyperballStickBuffer = new HyperballStickBuffer( {
 *     position1: new Float32Array( [ 0, 0, 0 ] ),
 *     position2: new Float32Array( [ 2, 2, 2 ] ),
 *     color: new Float32Array( [ 1, 0, 0 ] ),
 *     color2: new Float32Array( [ 0, 1, 0 ] ),
 *     radius1: new Float32Array( [ 1 ] ),
 *     radius2: new Float32Array( [ 2 ] )
 * } );
 */
class HyperballStickBuffer {
  /**
   * @param  {Object} data - attribute object
   * @param  {Float32Array} data.position1 - from positions
   * @param  {Float32Array} data.position2 - to positions
   * @param  {Float32Array} data.color - from colors
   * @param  {Float32Array} data.color2 - to colors
   * @param  {Float32Array} data.radius - from radii
   * @param  {Float32Array} data.radius2 - to radii
   * @param  {Float32Array} data.picking - picking ids
   * @param  {BufferParameters} params - parameter object
   */
  constructor (data, params) {
    if (!ExtensionFragDepth || (params && params.disableImpostor)) {
      data.radius = calculateMinArray(data.radius, data.radius2)
      return new CylinderGeometryBuffer(data, params)
    } else {
      return new HyperballStickImpostorBuffer(data, params)
    }
  }
}

export default HyperballStickBuffer