[Mesa-dev] Availability of LunarGLASS exploration: using LLVM in Mesa's compiler stack

John Kessenich johnk at lunarg.com
Fri Feb 4 16:01:07 PST 2011

I started a wiki page on what to do next in the LunarGLASS project at


Discussion could be posted there at that page, or in
lunarglass-devel at googlegroups.com.

We'll be doing actual on-going planning and development through the
code.google site, and barring some possible permissions/access problems,
others are welcome to join in.


On Wed, Feb 2, 2011 at 7:09 PM, John Kessenich <johnk at lunarg.com> wrote:

> Hi,
> Last November's discussion of LunarG's plan to build a common shader
> compiler stack with LLVM led to
> 1.  Needing to see a definition of the IRs
> 2.  Needing to experiment with translating these IRs to/from graphical
> languages
> We are exploring both these and are making these available through the
> following links:
>     Specification of IRs <http://www.lunarglass.org/>  See under
> Documentation.
>     Source Code <http://code.google.com/p/lunarglass/>  Instructions are
> in the wiki there on the "Building" page.
> Along with a new LunarGLASS discussion group at
>     Discussion Group <http://groups.google.com/group/lunarglass-devel>
> You are welcome to join in the discussion!
> Results so far are quite encouraging for the few simple shaders we targeted
> (still absent flow control).  In short, we were able to generate identical
> results to glsl2 when targeting Mesa IR, using LLVM optimizations instead of
> glsl2 optimizations.  That is, going through the path GLSL ->
> glsl2-front-end -> Top-IR -> LLVM optimizations -> Mesa-IR.
> It is a work in progress, not production-quality code, and early regarding
> design decisions, etc., so all feedback and ideas are welcome; about design,
> Top IR, Bottom IR, which other IRs or back-ends to target for mesa, etc.
>  This can be provided through the "Discussion Group" link above, or here, or
> directly to me.
> Note this project won't compile many shaders beyond the few we made up, as
> it is a thin vertical slice made to explore proof of concept, not a broadly
> working solution.  There are a couple of working tests in the
> LunarGLASS/test directory.  We are currently investigating flow control.
> The source code is being made available under a GPLv2 license.  The
> specification is currently under a Creative Commons Attribution-NoDerivs
> license.  There is more detail on this and on contributing to the project on
> the FAQ at http://www.lunarglass.org/.
> Cheers!
> JohnK
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