vertex index in vertex shader

PowerVR Insider
1

Is it possible to get the index of the vertex in the triangle in the vertex shader?





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I can pass it as attribute data but then I have to replicate all vertex data and as a result it is not useful to use glDrawElements anymore.





I like to use it for single pass wireframe rendering.


2

Hi Carl,

could you give a brief description on how your technique works and why you need the index?

Thanks,
Marco