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94 lines
1.7 KiB
94 lines
1.7 KiB
import Stats from '../libs/stats.module.js';
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// https://www.khronos.org/registry/webgl/extensions/EXT_disjoint_timer_query_webgl2/
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export class GPUStatsPanel extends Stats.Panel {
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constructor( context, name = 'GPU MS' ) {
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super( name, '#f90', '#210' );
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const extension = context.getExtension( 'EXT_disjoint_timer_query_webgl2' );
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if ( extension === null ) {
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console.warn( 'GPUStatsPanel: disjoint_time_query extension not available.' );
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}
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this.context = context;
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this.extension = extension;
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this.maxTime = 30;
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this.activeQueries = 0;
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this.startQuery = function () {
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const gl = this.context;
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const ext = this.extension;
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if ( ext === null ) {
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return;
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}
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// create the query object
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const query = gl.createQuery();
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gl.beginQuery( ext.TIME_ELAPSED_EXT, query );
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this.activeQueries ++;
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const checkQuery = () => {
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// check if the query is available and valid
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const available = gl.getQueryParameter( query, gl.QUERY_RESULT_AVAILABLE );
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const disjoint = gl.getParameter( ext.GPU_DISJOINT_EXT );
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const ns = gl.getQueryParameter( query, gl.QUERY_RESULT );
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const ms = ns * 1e-6;
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if ( available ) {
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// update the display if it is valid
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if ( ! disjoint ) {
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this.update( ms, this.maxTime );
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}
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this.activeQueries --;
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} else if ( gl.isContextLost() === false ) {
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// otherwise try again the next frame
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requestAnimationFrame( checkQuery );
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}
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};
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requestAnimationFrame( checkQuery );
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};
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this.endQuery = function () {
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// finish the query measurement
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const ext = this.extension;
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const gl = this.context;
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if ( ext === null ) {
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return;
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}
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gl.endQuery( ext.TIME_ELAPSED_EXT );
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};
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}
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}
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