cesiumDemo/Source/Renderer/BufferUsage.js

import freezeObject from '../Core/freezeObject.js';
import WebGLConstants from '../Core/WebGLConstants.js';

    /**
     * @private
     */
    var BufferUsage = {
        STREAM_DRAW : WebGLConstants.STREAM_DRAW,
        STATIC_DRAW : WebGLConstants.STATIC_DRAW,
        DYNAMIC_DRAW : WebGLConstants.DYNAMIC_DRAW,

        validate : function(bufferUsage) {
            return ((bufferUsage === BufferUsage.STREAM_DRAW) ||
                    (bufferUsage === BufferUsage.STATIC_DRAW) ||
                    (bufferUsage === BufferUsage.DYNAMIC_DRAW));
        }
    };
export default freezeObject(BufferUsage);