%mathent; ]> 2011-2014 Khronos Group gl_InvocationID 3G gl_InvocationID contains the invocation index of the current shader in int gl_InvocationID 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. 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. gl_InvocationID gl_InstanceID 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/.