/**
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* @Author : Caven Chen
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*/
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import { Cesium } from '../../../libs'
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import State from '../../state/State'
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import { Util } from '../../utils'
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import SnowShader from '../../material/shader/weather/SnowShader.glsl'
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class Snow {
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constructor(viewer) {
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this._id = Util.uuid()
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this._viewer = viewer
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this._delegate = undefined
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this._enable = false
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this._speed = 10.0
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this._state = State.INITIALIZED
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}
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get type() {
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return 'snow'
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}
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set enable(enable) {
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this._enable = enable
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if (enable && this._viewer && !this._delegate) {
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this._createPostProcessStage()
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}
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this._delegate && (this._delegate.enabled = enable)
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}
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get enable() {
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return this._enable
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}
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set speed(speed) {
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this._speed = speed
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this._delegate && (this._delegate.uniforms.speed = speed)
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}
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get speed() {
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return this._speed
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}
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/**
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*
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* @private
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*/
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_createPostProcessStage() {
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this._delegate = new Cesium.PostProcessStage({
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name: this._id,
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fragmentShader: SnowShader,
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uniforms: {
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speed: this._speed,
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},
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})
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this._viewer.scene.postProcessStages.add(this._delegate)
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}
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}
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export default Snow
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