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CHROMIUM_sync_query.txt
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Name
CHROMIUM_sync_query
Name Strings
GL_CHROMIUM_sync_query
Version
Last Modifed Date: April 15, 2014
Dependencies
OpenGL ES 2.0 is required.
EXT_occlusion_query_boolean is required.
Overview
This extension provides a query mechanism that allow for synchronization
between the host CPU and the GPU, which may be accessing the same
resources (typically memory).
This extension is useful in conjunction with CHROMIUM_map_image to
determine when it is safe to access a mapped image. Once the result of
a COMMANDS_COMPLETED_CHROMIUM query is available, all drawing commands
issued before the query must have finished. This ensures that the memory
corresponding to the issued commands can be safely modified (assuming no
other outstanding drawing commands are issued subsequent to the query).
New Procedures and Functions
None.
Errors
None.
New Tokens
Accepted by the <target> parameter of BeginQueryEXT, EndQueryEXT,
and GetQueryivEXT:
COMMANDS_COMPLETED_CHROMIUM 0x84F7
New State
None.
Revision History
4/15/2014 Documented the extension