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.
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OpenGL Shading Language Version
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| Variable Name | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 |
4.50
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| gl_InvocationID | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
✔
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[1] Versions 1.50 to 3.30 - geometry shaders only.
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