[Mesa-dev] Broadcom VC4 project

Eric Anholt eric at anholt.net
Thu Jun 19 00:54:08 PDT 2014

Dave Airlie <airlied at gmail.com> writes:

>> I'm working toward building a Mesa driver for Broadcom VC4 (aka
>> Raspberry Pi).  At the moment I'm still bringing up the DRM side of
>> things, but I hope to be doing bits of userspace in the next few days.
>> Current status is I have a skeleton DRM KMS driver that's going to talk
>> to the firmware for modesetting, and now I'm starting on the execution
>> side of things.
>> I'm probably going to start out doing a gallium driver for simplicity,
>> to avoid having to do all the DRI crap we've got in brw_context.c and
>> texture miptree validation and getting user data into VBOs and all that
>> other almost-boilerplate.  Long term I may end up switching to classic
>> so I can get swrast fallbacks and the ability to implement single-copy
>> manually-tiled TexImage uploads like.  For now I want to get to drawing
>> triangles as soon as I can.
> Do we know anywhere swrast fallbacks make sense? like except for
> conformance testing,
> You've got an armv6 swrast fallbacks are going to be punishing, I
> don't even think it has neon extensions.

Yeah, but fallbacks are less punishing than "my screen is black, what's
going on?!?!" bug reports.
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