Chapter 787: WebGLTimestampQueryPool

Core Idea

Manages a pool of WebGL timestamp queries for performance measurement. Handles creation, execution, and resolution of timer queries using WebGL extensions.

Reference Tables

Constructor

Signature
`new WebGLTimestampQueryPool( gl : WebGLRenderingContext

Methods

Method	Description
.allocateQueriesForContext( uid : string ) : number	Allocates a pair of queries for a given render context.
.beginQuery( uid : string )	Begins a timestamp query for the specified render context.
.dispose()	Releases all resources held by this query pool. This includes deleting all query objects and clearing internal state.
.endQuery( uid : string )	Ends the active timestamp query for the specified render context.
.resolveQueriesAsync() : Promise.<number> (async)	Asynchronously resolves all completed queries and returns the total duration.
.resolveQuery( query : WebGLQuery ) : Promise.<number> (async)	Resolves a single query, checking for completion and disjoint operation.

Key Takeaways

1. WebGLTimestampQueryPool extends: TimestampQueryPool
2. Key methods: allocateQueriesForContext, beginQuery, dispose, endQuery.

Connects To

• TimestampQueryPool: parent class
• Source: src/renderers/webgl-fallback/utils/WebGLTimestampQueryPool.js