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gallium/docs: add more info about TXF and MSAA textures

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If the texture is multisampled, the coord.w component indicates which
sample to fetch.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Brian Paul 2017-08-02 11:06:28 -06:00
parent 9e94aa7758
commit 426673e271
1 changed files with 3 additions and 1 deletions
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4
src/gallium/docs/source/tgsi.rst
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@ -951,7 +951,9 @@ XXX doesn't look like most of the opcodes really belong here.
image or PIPE_BUFFER resource. The source sampler may not be a CUBE or
SHADOW. src 0 is a
four-component signed integer vector used to identify the single texel
accessed. 3 components + level. Just like texture instructions, an optional
accessed. 3 components + level. If the texture is multisampled, then
the fourth component indicates the sample, not the mipmap level.
Just like texture instructions, an optional
offset vector is provided, which is subject to various driver restrictions
(regarding range, source of offsets). This instruction ignores the sampler
state.