Mesa (master): tgsi: document texture opcodes
Brian Paul
brianp at kemper.freedesktop.org
Tue Dec 14 21:36:22 UTC 2010
Module: Mesa
Branch: master
Commit: 2a77c3cc0b5ea126e9e15d9a928f3dc944e3668f
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=2a77c3cc0b5ea126e9e15d9a928f3dc944e3668f
Author: Brian Paul <brianp at vmware.com>
Date: Tue Dec 14 12:45:36 2010 -0700
tgsi: document texture opcodes
---
src/gallium/docs/source/tgsi.rst | 64 ++++++++++++++++++++++++++++++++++---
1 files changed, 58 insertions(+), 6 deletions(-)
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index d99ed7c..7eb6bd0 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -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
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