<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [OpenGL CTS][SKL,KBL] KHR-GL45.vertex_attrib_64bit.limits_test occasionally fails" href="https://bugs.freedesktop.org/show_bug.cgi?id=104335#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [OpenGL CTS][SKL,KBL] KHR-GL45.vertex_attrib_64bit.limits_test occasionally fails" href="https://bugs.freedesktop.org/show_bug.cgi?id=104335">bug 104335</a> from <a class="email" href="mailto:itoral@igalia.com" title="Iago Toral <itoral@igalia.com>"> Iago Toral</a> <pre>Another thing I noticed is that if I modify the vertex shader in these tests to also use gl_VertexID besides gl_InstanceID, for example replacing gl_InstanceID in gl4cVertexAttrib64bitTest.cpp:1826 with this expression: (gl_InstanceID + gl_VertexID * 2 - gl_VertexID - gl_VertexID) so the end result is the same but it makes the compiler read gl_VertexID, then I can no longer reproduce the problem, even if I do the scrolling thing I mention in the first comment which most definitely makes the issue reproducible much more easily. Based on this, I thought there may be some piece of state that is only set when we resad gl_VertexID that could be affecting the test but setting prog_data->uses_vertexid when we set prog_data->uses_instanceid doesn't seem to fix the problem and I did not identify any other place in the code where reading gl_VertexID affects state setup...</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>