[Mesa-dev] [PATCH 1/2] gallium/docs: improve docs for SAMPLE_POS, SAMPLE_INFO, TXQS, MSAA semantics

[Marek Olšák]

On Wed, Aug 23, 2017 at 12:30 AM, Roland Scheidegger <sroland at vmware.com> wrote:
> Am 22.08.2017 um 17:15 schrieb Marek Olšák:
>> On Sun, Aug 20, 2017 at 12:32 AM, Roland Scheidegger <sroland at vmware.com> wrote:
>>> Am 19.08.2017 um 21:32 schrieb Marek Olšák:
>>>> How about we remove all opcodes that are unused? Like:
>>>>
>>>> SAMPLE_POS
>>>> SAMPLE_INFO
>>>> SAMPLE
>>>> SAMPLE_I
>>>> SAMPLE_I_MS
>>>> SAMPLE_B
>>>> SAMPLE_C
>>>> SAMPLE_C_LZ
>>>> SAMPLE_D
>>>> SAMPLE_L
>>>> GATHER4
>>>> SVIEWINFO
>>> These are all d3d10 opcodes, and we need them (llvmpipe supports all of
>>> them with the exception of sample_pos and sample_info, right now). (It's
>>
>> SAMPLE_INFO is almost the same as TXQS and given the current state of
>> driver support, it would be better to remove SAMPLE_INFO and keep
>> TXQS.
>>
>> SAMPLE_INFO returns (samples, 0, 0, 0), while TXQS returns (samples,
>> undef, undef, undef).
>>
>> There is also RESQ, which returns (w, h, d|layers, samples).
>>
>
> They take different register types, however.

Most instructions support multiple register types. MOV supports TEMP,
CONST, IN, OUT. LOAD supports IMAGE, BUFFER, and in the future maybe
also CONSTBUF and SAMP.

Marek