[Mesa-dev] [PATCH 1/4] i965: Remove "single threaded" INTEL_DEBUG mode.

[Eric Anholt]

On Mon, 24 Oct 2011 15:01:30 -0700, Kenneth Graunke <kenneth at whitecape.org> wrote:
> According to the docs for 3DSTATE_PS (Gen7+) and 3DSTATE_WM (Gen6),
> there is a platform dependent value for the minimum number of pixel
> shader threads.  It may also vary based on whether WIZ Hashing is on.
> 
> For example, Ivybridge requires at least 4 threads if WIZ hashing is
> disabled, and 8 if it's enabled.  Programming it to use less threads is
> illegal.  Sandybridge appears to have similar restrictions.
> 
> So on newer platforms, INTEL_DEBUG=sing will probably just hang the GPU.
> Rather than try to patch it up for newer platforms and extend it to
> support geometry shaders, just remove it as it isn't that useful anyway.
> 
> Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>

Reviewed-by: Eric Anholt <eric at anholt.net>

Even on the pre-gen6 hardware, this basically never ended up being
useful -- maybe in the original gen4 driver bringup.
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