https://bugs.freedesktop.org/show_bug.cgi?id=104143 --- Comment #6 from Gert Wollny --- Created attachment 136004 --> https://bugs.freedesktop.org/attachment.cgi?id=136004&action=edit Piglit output with extra pos parameter and sb enabled In this image on can see that the (corrected) position passed as extra parameter differs from the gl_Position for index=0 (colour coded difference), but only for index 0. -- You are receiving this mail because: You are the assignee for the bug.