[Mesa-dev] Broadcom VC4 project

Emil Velikov emil.l.velikov at gmail.com
Wed Jun 18 10:47:22 PDT 2014

On 18/06/14 08:28, Eric Anholt wrote:
> To those who have been curious what I was up to: I wasn't sure when I
> could announce my new projecct, I just got the ack day before yesterday,
> and I've been a little busy.
> 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.
Hi Eric,

IIRC the i915 driver already uses softpipe/llvmpipe as a fallback for some
operations. Not sure how much coverage it has for what you have in might though :\


> Major thanks go to Simon Hall, whose port of the 2708 android driver
> code drop is what I've been using as a reference for how the 3D engine
> commands are submitted.
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