diff options
| author | Rob Clark <[email protected]> | 2015-06-10 19:49:55 -0400 |
|---|---|---|
| committer | Rob Clark <[email protected]> | 2015-06-21 07:51:53 -0400 |
| commit | b13135e06671468d296a33abf4150060f2b2a061 (patch) | |
| tree | 7013261ae64a1d26125cebe649fcd20d63a80917 /src/gallium/docs | |
| parent | 717376155d2082d7bf94122a1e1d383b39e0b070 (diff) | |
tgsi: update docs for SVIEW usage with TEX* instructions
Based on mailing list discussion here:
http://lists.freedesktop.org/archives/mesa-dev/2014-November/071583.html
Signed-off-by: Rob Clark <[email protected]>
Reviewed-by: Roland Scheidegger <[email protected]>
Reviewed-by: Jose Fonseca <[email protected]>
Diffstat (limited to 'src/gallium/docs')
| -rw-r--r-- | src/gallium/docs/source/tgsi.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst index f77702aa6a9..89ca172080e 100644 --- a/src/gallium/docs/source/tgsi.rst +++ b/src/gallium/docs/source/tgsi.rst @@ -2965,6 +2965,18 @@ resource can be one of BUFFER, 1D, 2D, 3D, 1DArray and 2DArray. type must be 1 or 4 entries (if specifying on a per-component level) out of UNORM, SNORM, SINT, UINT and FLOAT. +For TEX\* style texture sample opcodes (as opposed to SAMPLE\* opcodes +which take an explicit SVIEW[#] source register), there may be optionally +SVIEW[#] declarations. In this case, the SVIEW index is implied by the +SAMP index, and there must be a corresponding SVIEW[#] declaration for +each SAMP[#] declaration. Drivers are free to ignore this if they wish. +But note in particular that some drivers need to know the sampler type +(float/int/unsigned) in order to generate the correct code, so cases +where integer textures are sampled, SVIEW[#] declarations should be +used. + +NOTE: It is NOT legal to mix SAMPLE\* style opcodes and TEX\* opcodes +in the same shader. Declaration Resource ^^^^^^^^^^^^^^^^^^^^ |