Comment # 20 on bug 89069 from Michel Dänzer

(In reply to smoki from comment #19)
>  if (type != TGSI_PROCESSOR_COMPUTE && TGSI_PROCESSOR_FRAGMENT) {

That always evaluates as false, because TGSI_PROCESSOR_FRAGMENT is 0. You
probably meant

  if (type != TGSI_PROCESSOR_COMPUTE && type != TGSI_PROCESSOR_FRAGMENT) {

but that might not work, I suspect this problem is more likely related to the
vertex shader.