[Bug 76749] [HSW] DOTA world lighting has no effect

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76749

--- Comment #4 from Chia-I Wu <olvaffe at gmail.com> ---
Moved to HSW.  Noticed another rendering issue introduced by

commit 9cd51bb0c4608258199c69bc7738e72f055799d2
Author: Matt Turner <mattst88 at gmail.com>
Date:   Tue Mar 11 13:16:37 2014 -0700

    i965/vec4: Eliminate writes that are never read.

It does not seem to be related to this bug either.

But I can confirm that the deferred_simple_light shader is the source of the
bug.  I had a look at the FS part of the shader.  The lighting effect can be
observed when I replaced "oT1", which is the varying for the light direction
AFAICT, by a fixed value.  It is possible that the VS part is miscompiled,
giving FS wrong light direction.  I will dig more tomorrow.

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