<asshat>
Look harder. There *should* be routing tables of some sort on there.
If there really aren't, then you might have to actually start in on
your shader compilers instead of just translating opcodes
one-at-a-time, but this isn't a bad thing as it's what everybody needs
to do for performance.
</asshat>
Also, as stated before, it's a bad idea to fix GLSL and pretend that
everything's kosher, because it'll break again next time somebody
provides a shader generator of non-trivial complexity. HLSL is the
obvious candidate, but there might be GPGPU languages that do the same
thing. While I have no serious objection to changing Gallium's TGSI
semantics and permanently forbidding this, I kind of wish the drivers
could just be more robust.
~ C.
On Fri, Jan 29, 2010 at 10:15 AM, Luca Barbieri <l...@luca-barbieri.com> wrote:
> As a concrete example, the current nv40 code does this during fragment
> program translation.
> case TGSI_SEMANTIC_GENERIC:
> if (fdec->Semantic.Index <= 7) {
> hw = NV40_FP_OP_INPUT_SRC_TC(fdec->Semantic.
> Index);
> } else {
> NOUVEAU_ERR("bad generic semantic index\n");
> return FALSE;
> }
> break;
>
> As a result, GLSL completely fails to work on nv30 and nv40.
>
> nv50 instead seems to have hardware routing support, which is used by
> the driver.
>
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<mostawesomed...@gmail.com>
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