GL_INVOCATIONID(3G)

    .SH "NAME" gl_InvocationID - contains the invocation index of the current shader
    .SH "DECLARATION"

            in
            int
            gl_InvocationID
        ;

    .SH "DESCRIPTION"
        .PP In the tessellation control language, gl_InvocationID contains the index of the output patch vertex assigned to the shader invocation. It is assigned an integer value in the range [0, N-1] where N is the number of output patch vertices.
        .PP In the geometry language, gl_InvocationID identifies the invocation number assigned to the geometry shader invocation. It is assigned an integer value in the range [0, N-1] where N is the number of geometry shader invocations per primitive.

    .SH "VERSION SUPPORT"

        .TS allbox tab(:); l l l l l. T{ gl_InvocationID T}:T{ T}:T{ T}:T{ T}:T{ T}

    .SH "SEE ALSO"
        .PP gl_InstanceID()

    .SH "COPYRIGHT"
        .PP Copyright © 2011-2015 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.

COPYRIGHT
Copyright © 2011-2015 Khronos Group