[Mesa-dev] [PATCH 03/11] st/mesa: implement GL_ATI_fragment_shader

[Ilia Mirkin]

On Wed, Dec 16, 2015 at 5:28 PM, Miklós Máté <mtmkls at gmail.com> wrote:
>>> +   if (srcReg->argMod & GL_NEGATE_BIT_ATI) {
>>> +      struct ureg_src modsrc[2];
>>> +      modsrc[0] = ureg_src(arg);
>>> +      modsrc[1] = ureg_imm1f(t->ureg, -1.0);
>>> +
>>> +      emit_insn(t, TGSI_OPCODE_MUL, &arg, 1, modsrc, 2);
>>
>> aka NEG arg, arg
>
> I'd love to, but there is no such TGSI opcode.

Gah! There's an INEG, that's like the same thing ;) Seriously though,
there's actually a NEG modifier as well that you can use --
ureg_negate(src), which you can use with a plain MOV (or any other
op).

  -ilia