I have spent some time refactoring the r300 classic Mesa shader compiler
(backend) to be more or less independent of Mesa. The goal is to create a
library that can be used from both classic Mesa _and_ from a Gallium driver
(thus bug fixing and other improvements will be beneficial to both projects at
the same time; in particular, the significant amount of bugfixing that has
already gone into the project will be immediately available to Gallium).
The code is at:
git://anongit.freedesktop.org/~nh/mesa r300-compiler
http://cgit.freedesktop.org/~nh/mesa/log/?h=r300-compiler
The current state is:
. More regression testing would be good.
. Almost all assumptions about Mesa in the compiler proper are gone.
. Mesa *is* still used for its instruction printer and prog_instruction and
related structures.
On top of that, the branch contains a significant cleanup of the vertex
program compiler.
Internally, the compiler now uses a very simply program representation based
on prog_instruction. Both classic Mesa and Gallium will translate their input
representation into this intermediate representation. The end result of
compilation is a structure full of raw register settings and translated
instructions that can be uploaded to the hardware pretty much directly. I have
some comments with rationale for this (and a rant about TGSI), as well as a
comment about the memory pool structure, which I will write about in a
followup.
I plan to do some more testing on the branch and then start hooking it up into
the Gallium driver over the next week or so.
cu,
Nicolai
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