[Mesa-dev] i965 CS state tracking

[Kenneth Graunke]

On Thursday, September 04, 2014 07:30:27 AM Chris Forbes wrote:
> On Thu, Sep 4, 2014 at 7:20 AM, Kenneth Graunke <kenneth at whitecape.org> wrote:
> > I know that you can link together VS/GS/FS/HS/DS and CS together in a single GLSL linked program, and it just uses the 3D shaders or the compute shader depending whether you use glDraw* or glDispatchCompute.  So, if you did that, we'd additionally emit the CS stage's binding table when doing 3D drawing, and the 3D binding tables when doing compute.
> >
> > I might be wrong, but presumably if you link together 3D and compute shaders into a single program like that, you intend to use them together - i.e., do compute, then do 3D drawing using the results, or vice versa.  If I'm right about that, then the extra upload is not wasted - it's just done a little earlier.
> 
> Are you sure about this? I haven't looked at the SSO case in detail,
> but the ARB_compute_shader spec says, and our linker enforces:
> 
>     LinkProgram will fail if <program> contains a combination of compute and
>     non-compute shaders.

Sorry, I misread.  Issue 7 in the ARB_compute_shader spec makes it pretty clear that you can do something along those lines using SSO - but you're right, I don't think you can directly link them together.

--Ken
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