[Mesa-dev] is_tex bit for TGSI sampling instructions

[Michal Krol]

----- Original Message -----
> Any reasons
> 
>    { 1, 2, 0, 0, 0, 0, "LOAD",        TGSI_OPCODE_LOAD },
>    { 1, 2, 0, 0, 0, 0, "LOAD_MS",     TGSI_OPCODE_LOAD_MS },
>    { 1, 3, 0, 0, 0, 0, "SAMPLE",      TGSI_OPCODE_SAMPLE },
>    { 1, 4, 0, 0, 0, 0, "SAMPLE_B",    TGSI_OPCODE_SAMPLE_B },
>    { 1, 4, 0, 0, 0, 0, "SAMPLE_C",    TGSI_OPCODE_SAMPLE_C },
>    { 1, 4, 0, 0, 0, 0, "SAMPLE_C_LZ", TGSI_OPCODE_SAMPLE_C_LZ },
>    { 1, 5, 0, 0, 0, 0, "SAMPLE_D",    TGSI_OPCODE_SAMPLE_D },
>    { 1, 3, 0, 0, 0, 0, "SAMPLE_L",    TGSI_OPCODE_SAMPLE_L },
>    { 1, 3, 0, 0, 0, 0, "GATHER4",     TGSI_OPCODE_GATHER4 },
>    { 1, 2, 0, 0, 0, 0, "RESINFO",     TGSI_OPCODE_RESINFO },
>    { 1, 2, 0, 0, 0, 0, "SAMPLE_POS",  TGSI_OPCODE_SAMPLE_POS },
>    { 1, 2, 0, 0, 0, 0, "SAMPLE_INFO", TGSI_OPCODE_SAMPLE_INFO },
> 
> these don't have the is_tex bit set?
> 

This bit marks legacy texture sample instructions that have texture target encoded directly into the instruction token. In contrast, the instructions above take an extra argument of type RESOURCE, for which the texture target is encoded in register declaration.

-- 
michal