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

[Roland Scheidegger]

Am 23.08.2017 um 01:59 schrieb 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.
> 
That's true, but there aren't really any opcodes which could take either
sampler view reg file or sampler. Albeit I suppose it would be doable.
Though it looks to me like you could easily ditch TXQS in favor of RESQ
too then...

Roland