129 lines
4.1 KiB
JavaScript
129 lines
4.1 KiB
JavaScript
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/**
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* Class that represents a generator that streams the current recommendation clicked if any, or the frustum, and tries to preload recommendations that might be clicked
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* @constructor
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* @augments geo.V_PP_Generator
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* @param streamer {geo.MeshStreamer} the parent mesh streamer
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*/
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geo.V_PP_PD_Generator = function() {
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geo.V_PP_Generator.apply(this, arguments);
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};
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geo.V_PP_PD_Generator.prototype = Object.create(geo.V_PP_Generator);
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geo.V_PP_PD_Generator.prototype.constructor = geo.V_PP_PD_Generator;
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/**
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* Generates a config that streams partly the frustum, and splits the rest of the chunk among the recommendations that are likely to be clicked
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* @param cameraFrustum {Object} the frustum of the camera (with its position, target, and planes)
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* @param recommendationClicked {Number|null} id of the recommendation (can be null if no recommendations are clicked)
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* @returns {Object[]} an array with one element corresponding the current recommendation or the camera frustum, and others for eventual recommendations to preload
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*/
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geo.V_PP_PD_Generator.prototype.generateMainConfig = function(cameraFrustum, recommendationClicked) {
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var config;
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if (recommendationClicked != null) {
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if (this.streamer.beginning === true) {
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this.streamer.beginning = false;
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}
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// Case full reco
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console.log("Going to " + recommendationClicked);
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console.log("Recommendation is clicking : full for " + JSON.stringify(this.streamer.mesh.recommendations[recommendationClicked].position));
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config = [{recommendationId : recommendationClicked + 1, proportion: 1, smart:true}];
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} else if (this.streamer.beginning === true) {
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console.log('Begining : full init');
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config = [{recommendationId : 0, proportion:1, smart: true}];
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} else {
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// Case full prefetch
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console.log("Allow some prefetching");
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config = [{ frustum: cameraFrustum, proportion : this.streamer.frustumPercentage}];
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// Find best recommendation
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var bestReco;
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var bestScore = -Infinity;
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var bestIndex = null;
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if (this.streamer.predictionTable !== undefined) {
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var sum = 0;
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for (var i = 1; i <= this.streamer.mesh.recommendations.length; i++) {
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sum += this.streamer.predictionTable[this.streamer.previousReco][i];
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}
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for (var i = 1; i <= this.streamer.mesh.recommendations.length; i++) {
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if (this.streamer.predictionTable[this.streamer.previousReco][i] > 0) {
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config.push({
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proportion : this.streamer.predictionTable[this.streamer.previousReco][i] * this.streamer.prefetchPercentage / sum,
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recommendationId : i,
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smart: true
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});
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}
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}
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} else {
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process.stderr.write('ERROR : PREDICTION TABLE IF UNDEFINED');
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}
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}
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return config;
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};
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/**
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* Generates a config that depends on the previous configuration and that tries to fill the recommendations that were not already filled.
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* @param previousConfig {Object} the previous configuration list (that was launched on <code>generateMainConfig</code>
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* @param previousData {Object} the data that were given by the <code>nextElements</code> method on {@link geo.MeshStreamer}
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* @param cameraFrustum {Object} the frustum of the camera, containing its position, target and planes
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* @returns {Object[]} a configuration that tries to fill what was not filled before
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*/
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geo.V_PP_PD_Generator.prototype.generateFillingConfig = function(previousConfig, previousData, cameraFrustum) {
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var sum = 0;
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var newConfig = [];
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for (var i = 0; i < previousConfig.length; i++) {
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// Check if previousConfig was full
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if (previousResult.configSizes[i] >= this.streamer.chunk * previousConfig[i].proportion) {
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newConfig.push(previousConfig[i]);
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sum += previousConfig[i].proportion;
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}
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}
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// Normalize previousConfig probabilities
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for (var i = 0; i < newConfig.length; i++) {
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newConfig[i].proportion /= sum;
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}
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return newConfig;
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};
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