[Bug 99339] Incorrect rendering with Intel driver, correct with llvm softpipe

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99339

            Bug ID: 99339
           Summary: Incorrect rendering with Intel driver, correct with
                    llvm softpipe
           Product: Mesa
           Version: 13.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: ccr at tnsp.org
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Some wonky rendering occurs with Mesa 13.0.2 (not bisected, so unsure where
this issue has started) when using Intel HW OpenGL. The problem does not occur
with full software rendering (llvm softpipe) e.g. running with
LIBGL_ALWAYS_SOFTWARE=1

As I am not sure what the exact issue is (might be incorrect clipping or vector
calculation etc.) the best thing is to demonstrate, two screenshots and a OGV
format video available at: http://tnsp.org/~ccr/intel-gfx/blender/

In the video pay attention to the "floor grid" lines, which go about weirdly.
The other minor glitches are artifacts of the screen capture and not actually
visible.

I'll try latest GIT and bisecting during next weekend as I'll have more time
then.

-- Linux distribution: Debian GNU/Linux testing (stretch)
-- System architecture: amd64
   Foreign architectures: i386
-- Machine: Asus H97M-PLUS, Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
-- Kernel version: 4.8.15-grsec
-- Chipset: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated
Graphics Controller (rev 06)
-- Display connector(s): HDMI (2560x1440)
-- Window manager: WindowMaker 0.95.7-6+b1
-- xf86-video-intel: GIT 
-- X server: Xorg 2:1.19.0-3
-- Mesa: 13.0.2-3
-- libpixman: 0.34.0-1
-- libdrm version: 2.4.74-1

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