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tgsi: document texture opcodes

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This commit is contained in:
Brian Paul 2010-12-14 12:45:36 -07:00
parent bb10e081c8
commit 2a77c3cc0b
1 changed files with 58 additions and 6 deletions
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64
src/gallium/docs/source/tgsi.rst
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@ -577,17 +577,45 @@ This instruction replicates its result.
.. opcode:: TEX - Texture Lookup
TBD
.. math::
coord = src0
bias = 0.0
dst = texture_sample(unit, coord, bias)
.. opcode:: TXD - Texture Lookup with Derivatives
TBD
.. math::
coord = src0
ddx = src1
ddy = src2
bias = 0.0
dst = texture_sample_deriv(unit, coord, bias, ddx, ddy)
.. opcode:: TXP - Projective Texture Lookup
TBD
.. math::
coord.x = src0.x / src.w
coord.y = src0.y / src.w
coord.z = src0.z / src.w
coord.w = src0.w
bias = 0.0
dst = texture_sample(unit, coord, bias)
.. opcode:: UP2H - Unpack Two 16-Bit Floats
@ -729,7 +757,19 @@ This instruction replicates its result.
.. opcode:: TXB - Texture Lookup With Bias
TBD
.. math::
coord.x = src.x
coord.y = src.y
coord.z = src.z
coord.w = 1.0
bias = src.z
dst = texture_sample(unit, coord, bias)
.. opcode:: NRM - 3-component Vector Normalise
@ -767,9 +807,21 @@ This instruction replicates its result.
dst = src0.x \times src1.x + src0.y \times src1.y
.. opcode:: TXL - Texture Lookup With LOD
.. opcode:: TXL - Texture Lookup With explicit LOD
TBD
.. math::
coord.x = src0.x
coord.y = src0.y
coord.z = src0.z
coord.w = 1.0
lod = src0.w
dst = texture_sample(unit, coord, lod)
.. opcode:: BRK - Break