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Name
CHROMIUM_completion_query
Name Strings
GL_CHROMIUM_completion_query
Version
Last Modified Date: May 7, 2019
Dependencies
OpenGL ES 2.0 is required.
GL_KHR_parallel_shader_compile is required.
Overview
This extension provides a same query mechanism as the COMPLETION_STATUS_KHR
in GL_KHR_parallel_shader_compile, which indicates whether the program
linking or shader compilation has completed. The major advantage of this
query is that it doesn't incurs an expensive round-trip to the GPU thread.
So it's much cheaper for polling. You can use it this way:
glBeginQueryEXT(PROGRAM_COMPLETION_QUERY_CHROMIUM, query);
glLinkProgram(program);
glEndQueryEXT(PROGRAM_COMPLETION_QUERY_CHROMIUM);
GLuint available = 0u;
glGetQueryObjectuivEXT(query, GL_QUERY_RESULT_AVAILABLE, &available);
if (available)
{
GLuint result = 0u;
glGetQueryObjectuivEXT(query, GL_QUERY_RESULT, &result);
}
If 'available' returns true, that's equivalent to COMPLETION_STATUS_KHR
returning true. Then LINK_STATUS can be obtained from 'result'.
New Procedures and Functions
None.
Errors
None.
New Tokens
Accepted by the <target> parameter of BeginQueryEXT, EndQueryEXT,
and GetQueryObjectuivEXT:
PROGRAM_COMPLETION_QUERY_CHROMIUM 0x6009
New State
None.
Revision History
5/3/2019 Documented the extension