[Bug 98431] UnrealEngine v4 demos startup fails to blorp blit assert

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98431

            Bug ID: 98431
           Summary: UnrealEngine v4 demos startup fails to blorp blit
                    assert
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: eero.t.tamminen at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Latest Mesa from git (a1652a0) aborts at UnrealEngine v4 demos [1] startup to:
-----------
$ INTEL_DEBUG=perf SunTemple/Binaries/Linux/SunTemple
...
128x51744 miptree too large to blit, falling back to untiled
SIMD16 shader failed to compile: CS compile failed: Failure to register
allocate.  Reduce number of live scalar values to avoid this.
Multi-LOD fast clear - giving up (2048x1024x11).
Multi-LOD fast clear - giving up (2048x1024x11).
SunTemple: ../../../src/intel/blorp/blorp_blit.c:1767:
surf_convert_to_uncompressed: Assertion `*height % fmtl->bh == 0 || *y +
*height == info->surf.logical_level0_px.height' failed.
Aborted (core dumped)
-----------

Assert happens for Stylized, Sun Temple, Light Room Interior Day, Subway
Reflections and Effects Cave demos.  They work fine with Mesa 12.0.3.

There's no assert in Atlantis demo.

[1] https://wiki.unrealengine.com/Linux_Demos

Note: in Effects cave & Reflections Subway demos the compilation of CS shaders
(using "Unsupported form of variable indexing") takes so much time (tens of
minutes?) that I didn't have patience to wait for them to start, but used
MESA_GL_VERSION_OVERRIDE=4.2 to disable CS use.

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