[Mesa-dev] [PATCH] draw: don't crash if GS doesn't emit anything

[Jose Fonseca]

----- Original Message -----
> > > What is "IA"?
> > 
> > "Input Assembly", a D3D10 term that roughly matches pipe_vertex_elements /
> > pipe_vertex_buffer state.
> > 
> > BTW, I think that Chris Forbes makes a good  point -- a GS might choose to
> > not emit any vertices (e.g., that does fancy culling) -- so maybe this
> > debugging message should be silent by default.
> 
> That's still a silly thing to do, because you're running a high cost
> operation on the slowest part of the pipeline. Ideally we'd connect to
> arb_debug_output for this stuff, but currently the most frequent cause of
> gs/ia not emitting any primitives is that something broke (e.g. one of our
> instructions is not fully compliant causing vs or gs errors in outputs) and
> the debug message is quite helpful in figuring that out. Of course I don't
> have a strong sentimental attachment to a debugging output but this
> particular one does make my job easier.

Fair enough.

Jose