[Mesa-dev] ARB_transform_feedback[23] on Haswell, Ubuntu 14.04

Brian Paul brianp at vmware.com
Thu Jan 15 16:08:49 PST 2015

I have a question on behalf of a coworker.  He's using Ubuntu 14.04 
(Mesa 10.1.3, kernel 3.13.0) on a Haswell system.  But glxinfo does not 
list support for GL_ARB_transform_feedback[23].  It does list 

According to the driver code (from master, 10.1.3 lacks ARB_texture_view):

    if (brw->gen >= 7) {
       ctx->Extensions.ARB_conservative_depth = true;
       ctx->Extensions.ARB_texture_view = true;
       if (can_do_pipelined_register_writes(brw)) {
          ctx->Extensions.ARB_transform_feedback2 = true;
          ctx->Extensions.ARB_transform_feedback3 = true;
          ctx->Extensions.ARB_transform_feedback_instanced = true;
          ctx->Extensions.ARB_draw_indirect = true;

this seems to indicate that can_do_pipelined_register_writes() is 
failing.  The comments on that function say it can fail if the kernel 
driver isn't new enough.  So I'm guessing this is a kernel module issue.

Can anyone confirm this behavior with Ubuntu 14.04?


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