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

Ian Romanick idr at freedesktop.org
Mon Jan 14 14:35:15 PST 2013

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.

> 2) textureSize should use the TXQ_LZ instruction for multisample
> textures (LZ = level zero, i.e. there is no lod parameter). IIRC, TXQ
> doesn't work on R600 if you set the lod parameter to non-zero.
> 3) ARB_texture_multisample can also be exposed using the table at the
> beginning of st_init_extensions, which defines CAP -> extension
> mapping.
> Marek
> On Sun, Jan 13, 2013 at 10:10 AM, Dave Airlie <airlied at gmail.com> wrote:
>>>> This series adds support for ARB_texture_multisample in core mesa
>>>> and the i965 driver, and initially enables it for Gen6.
>> Just FYI, I've got most of the gallium/r600g side of this working here
>> http://cgit.freedesktop.org/~airlied/mesa/log/?h=gallium-texture-multisample
>> needs a bit of cleanup, and review, but it shouldn't take too long
>> once your tree is merged.
>> Dave.
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