[Mesa-dev] [RFC PATCH 0/26] Implement ARB_texture_multisample

[Marek Olšák]

On Mon, Jan 14, 2013 at 11:35 PM, Ian Romanick <idr at freedesktop.org> wrote:
> On 01/13/2013 06:20 AM, Marek Olšák wrote:
>>
>> Hi Dave, here's a preliminary review.
>>
>> 1) The depth and integer texture sample limits should be set according
>> to driver support, we probably don't have good queries for that.
>>
>> - R6xx cannot do depth MSAA textures.
>> - R6xx and R7xx cannot do integer MSAA textures.
>> - Color resolve with R11G11B10_FLOAT is buggy on R6xx, so we don't
>> support the format with a sample count > 1. This limitation might be
>> tricky to report with ARB_texture_multisample.
>
>
> GL_ARB_internalformat_query2 allows queries of all these sorts of things.
> Mesa doesn't support it yet, but we could probably use some internal
> infrastructure in this area first.

We do have some internal infrastructure in Mesa, well Gallium
actually, but it's pretty much Mesa for some of us:
pipe_screen::is_format_supported is very flexible and r600g does
expose all its limits through that function already. I saw your
ARB_internalformat_query series and I wondered why you had added a
pretty limited query for the sample count to dd_function_table -
QuerySamplesForFormat. It was obvious that it would have to go away
and be replaced by something more useful for
ARB_internalformat_query2. If you copied is_format_supported from
gallium, you'd be internally almost done with
ARB_internalformat_query2. I don't think we need greater flexibility
than that, well maybe for pre-r600 we do.

Marek