gl_InstanceID is a vertex language input variable that holds the integer index of the current primitive in an instanced draw command such as glDrawArraysInstanced. If the current primitive does not originate from an instanced draw command, the value of gl_InstanceID is zero.
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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_InstanceID | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
✔
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