@arcgis/core
Version:
ArcGIS Maps SDK for JavaScript: A complete 2D and 3D mapping and data visualization API
3 lines (2 loc) • 4.28 kB
JavaScript
/* COPYRIGHT Esri - https://js.arcgis.com/5.0.19/LICENSE.txt */
import{DataType as e}from"../../../../../views/webgl/enums.js";class t{constructor(e,t,s,i,r){this._buffer=e,this._componentType=s,this._dataType=i,this._data=[],this._isFinalized=!1,this._accessorIndex=-1,this._accessorAttribute=null,this._accessorMin=null,this._accessorMax=null,t.bufferViews||(t.bufferViews=[]),this.index=t.bufferViews.length,this._bufferView={buffer:e.index,byteLength:-1,target:r};const n=this._getElementSize();n>=4&&34963!==r&&(this._bufferView.byteStride=n),t.bufferViews.push(this._bufferView),this._numComponentsForDataType=this._calculateNumComponentsForDataType()}push(e){const t=this._data.length;if(this._data.push(e),this._accessorIndex>=0){const s=t%this._numComponentsForDataType,i=this._accessorMin[s];this._accessorMin[s]="number"!=typeof i?e:Math.min(i,e);const r=this._accessorMax[s];this._accessorMax[s]="number"!=typeof r?e:Math.max(r,e)}}get dataSize(){return this._data.length*this._sizeComponentType()}get byteSize(){function e(e,t){return t*Math.ceil(e/t)}return e(this.dataSize,4)}getByteOffset(){if(!this._isFinalized)throw new Error("Cannot get BufferView offset until it is finalized");return this._buffer.getByteOffset(this)}get byteOffset(){if(!this._isFinalized)throw new Error("Cannot get BufferView offset until it is finalized");return this._buffer.getByteOffset(this)}_createTypedArray(t,s){switch(this._componentType){case e.BYTE:return new Int8Array(t,s);case e.FLOAT:return new Float32Array(t,s);case e.SHORT:return new Int16Array(t,s);case e.UNSIGNED_BYTE:return new Uint8Array(t,s);case e.UNSIGNED_INT:return new Uint32Array(t,s);case e.UNSIGNED_SHORT:return new Uint16Array(t,s)}}writeOutToBuffer(e,t){this._createTypedArray(e,t).set(this._data)}writeAsync(e){if(this._asyncWritePromise)throw new Error("Can't write multiple bufferView values asynchronously");return this._asyncWritePromise=e.then(e=>{const t=new Uint8Array(e);for(let s=0;s<t.length;++s)this._data.push(t[s]);delete this._asyncWritePromise}),this._asyncWritePromise}startAccessor(e){if(this._accessorIndex>=0)throw new Error("Accessor was started without ending the previous one");this._accessorIndex=this._data.length,this._accessorAttribute=e;const t=this._numComponentsForDataType;this._accessorMin=new Array(t),this._accessorMax=new Array(t)}endAccessor(){if(this._accessorIndex<0)throw new Error("An accessor was not started, but was attempted to be ended");const t=this._getElementSize(),s=this._numComponentsForDataType,i=(this._data.length-this._accessorIndex)/s;if(i%1)throw new Error("An accessor was ended with missing component values");for(let e=0;e<this._accessorMin.length;++e)"number"!=typeof this._accessorMin[e]&&(this._accessorMin[e]=0),"number"!=typeof this._accessorMax[e]&&(this._accessorMax[e]=0);const r={byteOffset:t*(this._accessorIndex/s),componentType:this._componentType,count:i,type:this._dataType,min:this._accessorMin,max:this._accessorMax,name:this._accessorAttribute};switch(this._accessorAttribute){case"TEXCOORD_0":case"TEXCOORD_1":case"COLOR_0":case"WEIGHTS_0":switch(this._componentType){case e.UNSIGNED_BYTE:case e.UNSIGNED_SHORT:r.normalized=!0}}return this._accessorIndex=-1,this._accessorAttribute=null,this._accessorMin=null,this._accessorMax=null,r}get finalized(){return this._finalizedPromise?this._finalizedPromise:this._isFinalized?this._finalizedPromise=Promise.resolve():this._finalizedPromise=new Promise(e=>this._finalizedPromiseResolve=e)}async finalize(){const e=this._bufferView,t=this._buffer.getViewFinalizePromises(this);this._asyncWritePromise&&t.push(this._asyncWritePromise),await Promise.allSettled(t),this._isFinalized=!0,e.byteOffset=this.getByteOffset(),e.byteLength=this.dataSize,this._finalizedPromiseResolve&&this._finalizedPromiseResolve()}_getElementSize(){return this._sizeComponentType()*this._numComponentsForDataType}_sizeComponentType(){switch(this._componentType){case e.BYTE:case e.UNSIGNED_BYTE:return 1;case e.SHORT:case e.UNSIGNED_SHORT:return 2;case e.UNSIGNED_INT:case e.FLOAT:return 4}}_calculateNumComponentsForDataType(){switch(this._dataType){case"SCALAR":return 1;case"VEC2":return 2;case"VEC3":return 3;case"VEC4":case"MAT2":return 4;case"MAT3":return 9;case"MAT4":return 16}}}export{t as BufferView};