gl_InvocationID

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Contains the invocation index of the current shader.

Declaration[edit]

Description[edit]

In the tessellation control language,gl_InvocationIDcontains 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.

In the geometry language,gl_InvocationIDidentifies 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.


Version Support[edit]

gl_InvocationID 1.5+

[1] Versions 1.50 to 3.30 - geometry shaders only.


See Also[edit]

 gl_InstanceID 


Copyright[edit]

Copyright© 2011-2014 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/.