[Mesa-dev] Interest in GL_ARB_gl_spirv support?

[Ilia Mirkin]

On Tue, Jul 26, 2016 at 7:44 PM, Marek Olšák <maraeo at gmail.com> wrote:
> On Wed, Jul 27, 2016 at 12:29 AM, oscar bg <rtfss1 at gmail.com> wrote:
>> Hi,
>> seems this year 2016 OpenGL ARB update brings a small number of extensions..
>> seems the most important is GL_ARB_gl_spirv.. seems like SPIRV as a binary
>> format for OpenGL and Mesa doesn't have any binary format even supporting
>> ARB_program_binary ext.. a Nvidia driver is already providing support from
>> day 1 for Linux as always..
>>
>> just asking how difficult would be to bring support to Mesa drivers.. and if
>> there is any interest by Mesa devs start working on it soon..
>>
>> seems already we have SPIRV support in Mesa in Vulkan drivers: Anvil Vulkan
>> Intel driver and some days ago RADV a open source Vulkan driver for AMD GPUs
>> has been anounced.. as this drivers already eat SPIRV code seems this
>> extension would take less work to port to this two vendor GPUs?
>
> The showstopper for sharing Vulkan code is that OpenGL doesn't have
> pipeline state objects. Because of that, you can ignore RADV. I think
> nobody has enough resources to replicate what the radeonsi TGSI path
> does, so you are pretty much stuck with TGSI.
>
> SPIRV -> NIR -> TGSI should work.

FWIW my plans for nouveau definitely involve direct SPIR-V input. This
will also be useful for an independent Vulkan driver, as well as
OpenCL SPIR-V. However I'm not sure when such plans will materialize.

  -ilia