[Bug 91916] [All regression] Render error when running Unigine-Heave_v4.0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91916

--- Comment #4 from ye.tian <yex.tian at intel.com> ---
By bisect, shows the first bad mesa commit is 5ead4487.

commit 5e3974338ed7ea49a41405f8c2e4bcd5fd1f5c80
Author:     Marek Olšák <marek.olsak at amd.com>
AuthorDate: Thu Jul 16 14:54:50 2015 +0200
Commit:     Marek Olšák <marek.olsak at amd.com>
CommitDate: Thu Jul 23 00:59:24 2015 +0200

    gallium/radeon: remove buffer_unmap calls that can potentially decrease
perf

    buffer_unmap is currently a no-op on radeon and done correctly on amdgpu.
    I plan to fix it for radeon, but before that, all occurences of
buffer_unmap
    that can negatively affect performance in the future must be removed.

    There are 2 reasons for removing buffer_unmap calls:
    - There is a likelihood that buffer_map will be called again, so we don't
      want to unmap yet.
    - The buffer is being released, which automatically unmaps it.

    Reviewed-by: Michel Dänzer <michel.daenzer at amd.com>

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