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Apart from code, I’d like to know what this error is about:
two vertex attribute variables (named a and n) were assigned to the same generic vertex attribute
which I came across while compiling my vertex shader in GLSL (an experiment for transform feedback) with Nsight on Ubuntu. I mean, which are all the possible causes of this error?
It looks like you are binding two different vertex attributes to the same location in your OpenGL code.
For example, when you bind attributes you usually do this:
What you must be doing is using the same index for both attributes:
Generate another generic vertex attribute location and this should disappear.
You can use whatever non-negative numbers you like (in a small range).
Also keep in mind that glBindAttribLocation has to be called before linking the program.