Name CHROMIUM_command_buffer_query Name Strings GL_CHROMIUM_command_buffer_query Version Last Modified Date: August 19, 2019 Dependencies None. Overview This extension provides a query mechanism that allows the client to get timing information from the Chromium command buffer. GL_COMMANDS_ISSUED_CHROMIUM can be used to measure the time elapsed in microseconds between a BeginQueryEXT and an EndQueryEXT. This is the time that it takes to issue the enclosed commands to the underlying driver (not the time it takes to complete them). It only counts time during which the associated context is scheduled. The value of the timer can be obtained using GetQueryObjectuivEXT. GL_COMMANDS_ISSUED_TIMESTAMP_CHROMIUM can be used as the target to QueryCounterEXT to obtain the timestamp in microseconds at which the QueryCounterEXT is reached on the service-side command buffer. This is useful to know by what time all the commands prior to the QueryCounterEXT have been issued to the underlying driver (but have not necessarily completed). The timestamp value can be obtained using GetQueryObjectui64vEXT. New Procedures and Functions void BeginQueryEXT(enum target, uint id); void EndQueryEXT(enum target); void QueryCounterEXT(uint id, enum target); void GetQueryivEXT(enum target, enum pname, int *params); void GetQueryObjectuivEXT(uint id, enum pname, uint *params); void GetQueryObjectui64vEXT(uint id, enum pname, uint64 *params); Errors None. New Tokens Accepted by the parameter of BeginQueryEXT, EndQueryEXT, and GetQueryivEXT: GL_COMMANDS_ISSUED_CHROMIUM 0x6004 Accepted by the parameter of QueryCounterEXT and GetQueryivEXT: GL_COMMANDS_ISSUED_TIMESTAMP_CHROMIUM 0x6005 New State None. Revision History 8/19/2019 Documented the extension