On 3 January 2012 18:16, Eric Anholt <<a href="mailto:eric@anholt.net">eric@anholt.net</a>> wrote: <div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> This series is Reviewed-by: Eric Anholt <<a href="mailto:eric@anholt.net">eric@anholt.net</a>> With this and the fix I have for glGetTransformFeedbackVarying(), I think we should be passing the oglc tests, except for one more case: They try to ask for whole arrays to be fed back, without [] in the declaration. The clearest text I could find on this point was a RESOLUTION: in the spec, but it kind of sounded to me like the resolution was about working around "how to I get feedback from my huge amount of varying data when I have so few TFB attributes available?" Did you end up testing whether other drivers accepted non-subscripted TFB varyings for varying arrays? </blockquote></div> No, I didn't write any tests of non-subscripted arrays. My interpretation of the spec had been that they weren't allowed, but now that I'm re-reading it, I'm reconsidering. I'll investigate on the nVidia proprietary linux driver and let you know what I find out. Do you have Piglit tests for glGetTransformFeedbackVarying()? I was starting to write some, but it was slow going and I don't want to duplicate effort.