If the texture is multisampled, the coord.w component indicates which sample to fetch. --- src/gallium/docs/source/tgsi.rst | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst index d7817cc..5bf9e95 100644 --- a/src/gallium/docs/source/tgsi.rst +++ b/src/gallium/docs/source/tgsi.rst @@ -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. + p *srJust 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. -- 1.9.1 _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
