[Mesa-dev] [Bug 79016] [REGRESSION] "st/mesa: drop the lowering of quad strips to triangle strips"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79016

Marek Olšák <maraeo at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTABUG

--- Comment #7 from Marek Olšák <maraeo at gmail.com> ---
"warn" is not a failure, like I said. I knew about this pass->warn change. It
actually uncovers a potential issue with the hardware - or with the test. It
depends on how you look at it.

>From the test:

 * Note: some OpenGL implementations do not pass the "flat_first" and
 * "flat_last" tests when rendering quads or polygons.  That is, they
 * produce a tessellation which contains the correct vertices, but not
 * in the order required to preserve flat shaded colors.  This is
 * unlikely to cause problems for client programs, since client
 * programs that use new features like transform feedback are unlikely
 * to also use deprecated features like quads and polygons.  Also, it
 * is a matter of interpretation whether these tests are expected to
 * pass at all--after all, the spec does say that "the order of
 * tessellation within a primitive is undefined".  Accordingly, these
 * failures, should they occur, are flagged as warnings rather than
 * failures.

However, my Mesa commit which causes this test not to pass on nouveau, radeon,
and probably other gallium drivers, and I did know about this, actually fixes
real issues with flat shading and primitive restart and therefore cannot be
reverted.

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