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gallium: add INTERP_* opcodes to support interpolateAt*

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Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Ilia Mirkin
2014-07-05 19:52:20 -04:00
parent ca5e15f40f
commit 7c9161521a
3 changed files with 32 additions and 1 deletions
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23
src/gallium/docs/source/tgsi.rst
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@@ -1808,6 +1808,29 @@ This instruction replicates its result.
dst = \frac{src.x}{src.x \times src.x + src.y \times src.y + src.z \times src.z + src.w \times src.w}
Interpolation ISA
^^^^^^^^^^^^^^^^^
The interpolation instructions allow an input to be interpolated in a
different way than its declaration. This corresponds to the GLSL 4.00
interpolateAt* functions. The first argument of each of these must come from
``TGSI_FILE_INPUT``.
.. opcode:: INTERP_CENTROID - Interpolate at the centroid
Interpolates the varying specified by src0 at the centroid
.. opcode:: INTERP_SAMPLE - Interpolate at the specified sample
Interpolates the varying specified by src0 at the sample id specified by
src1.x (interpreted as an integer)
.. opcode:: INTERP_OFFSET - Interpolate at the specified offset
Interpolates the varying specified by src0 at the offset src1.xy from the
pixel center (interpreted as floats)
.. _doubleopcodes:
Double ISA