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