[Mesa-dev] [PATCH 07/53] intel/fs: Add explicit last_rt flag to fb writes orthogonal to eot.

[Jason Ekstrand]

On Fri, May 25, 2018 at 11:27 AM, Matt Turner <mattst88 at gmail.com> wrote:

> On Thu, May 24, 2018 at 2:55 PM, Jason Ekstrand <jason at jlekstrand.net>
> wrote:
> > From: Francisco Jerez <currojerez at riseup.net>
>
> I think some explanation is required. I'm guessing this is because you
> have to write lo fragments out before high, but we should say that in
> the commit message.
>

How about this:

When using multiple RT write messages to the same RT such as for
dual-source blending or all RT writes in SIMD32, we have to set the "Last
Render Target Select" bit on all write messages that target the last RT but
only set EOT on the last RT write in the shader.  Special-casing for
dual-source blend works today because that is the only case which requires
multiple RT write messages per RT.  When we start doing SIMD32, this will
become much more common so we add a dedicated bit for it.
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