[Mesa-dev] [PATCH 2/2] gallium/docs: clarify TGSI_SEMANTIC_SAMPLEMASK, again

[Brian Paul]

Oops, yes, I misread the code.  I'll fix that.  Thanks.

-Brian

On 06/12/2017 11:49 AM, Ilia Mirkin wrote:
> It's actually a sysval, not an input.
>
> On Mon, Jun 12, 2017 at 1:37 PM, Brian Paul <brianp at vmware.com> wrote:
>> I've since discovered the fragment shader sample mask input (which
>> corresponds to gl_SampleMaskIn).
>> ---
>>   src/gallium/docs/source/tgsi.rst | 15 +++++++++++----
>>   1 file changed, 11 insertions(+), 4 deletions(-)
>>
>> diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
>> index 310b49d..7ca07dd 100644
>> --- a/src/gallium/docs/source/tgsi.rst
>> +++ b/src/gallium/docs/source/tgsi.rst
>> @@ -3328,10 +3328,17 @@ the center of the fragment.
>>   TGSI_SEMANTIC_SAMPLEMASK
>>   """"""""""""""""""""""""
>>
>> -For fragment shaders, this semantic label indicates that an output contains
>> -the sample mask used to disable further sample processing.  The output's
>> -type is uint[4] but only the X component is used (i.e. gl_SampleMask[0]).
>> -Each bit corresponds to one sample position (up to 32x MSAA is supported).
>> +For fragment shaders, this semantic label can be applied to either a
>> +shader input or output.
>> +
>> +For an input, the sample mask indicates the set of samples covered by
>> +the current primitive.  If MSAA is not enabled, the value is (~0, ~0, ~0, ~0).
>> +
>> +For an output, the sample mask is used to disable further sample processing.
>> +
>> +For both inputs and outputs, the register type is uint[4] but only the X
>> +component is used (i.e. gl_SampleMask[0]). Each bit corresponds to one
>> +sample position (up to 32x MSAA is supported).
>>
>>   TGSI_SEMANTIC_INVOCATIONID
>>   """"""""""""""""""""""""""
>> --
>> 1.9.1
>>
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