[Mesa-dev] new i965g pipe driver for Intel GEN6 (and later)

[Ian Romanick]

On 04/16/2013 05:09 PM, Marek Olšák wrote:
> On Tue, Apr 16, 2013 at 9:58 PM, Chia-I Wu <olvaffe at gmail.com> wrote:
>>
>> On Wed, Apr 17, 2013 at 12:58 AM, Matt Turner <mattst88 at gmail.com> wrote:
>>>
>>> I think everything Marek said was correct. If you could extend Gallium
>>> to consume GLSL IR it might actually be an interesting project.
>>
>> Yes, it is.  I do want to make pipe drivers be able to express the preferred IR and make the mesa state tracker generate it.  I had LLVM IR in mind, but GLSL IR could be a much less intrusive choice.  I will check that out.
>
> Actually, there is even a better option. You don't have to fork the
> compiler, you can add source files from src/mesa/drivers/dri/i965 to
> your gallium driver. We have done this before. r300g did not have its
> own compiler for a couple of *years*. The compiler lived in r300c in
> src/mesa/drivers/dri/r300/compiler and it was more or less a separate
> library (it did not depend on gl_context). If r300g was enabled, the
> build system also compiled files in the r300 compiler directory and
> the linker included them in the .so file. r300g also used (and still
> uses) the register allocator from src/mesa/program, which is also used
> by i965.
>
> Feel free to use the same approach. It was a big win for us.

That worked because the same set of people were working on both.  If 
we'll be expected to keep the i965g driver building and working when we 
make changes to our compiler back-end, that will be a deal breaker.

> Marek
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