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authorMarek Olšák <[email protected]>2017-03-07 02:15:14 +0100
committerMarek Olšák <[email protected]>2017-03-15 18:17:41 +0100
commitcca0389c729a7aae1d9793922592358cf683eed8 (patch)
tree9ada74e1a17041334a54bcb039fd9dd92fc98c27 /src/gallium/docs
parentbf3cdf0fd39028260076fe68931e9f59fa4bdc76 (diff)
gallium: add TGSI opcodes TEX_LZ and TXF_LZ
for better code generation in radeonsi
Diffstat (limited to 'src/gallium/docs')
-rw-r--r--src/gallium/docs/source/tgsi.rst33
1 files changed, 32 insertions, 1 deletions
diff --git a/src/gallium/docs/source/tgsi.rst b/src/gallium/docs/source/tgsi.rst
index 32ec4ef2ac3..18b42fba747 100644
--- a/src/gallium/docs/source/tgsi.rst
+++ b/src/gallium/docs/source/tgsi.rst
@@ -755,6 +755,29 @@ This instruction replicates its result.
dst = src0.x \times src1.x + src0.y \times src1.y
+.. opcode:: TEX_LZ - Texture Lookup With LOD = 0
+
+ This is the same as TXL with LOD = 0. Like every texture opcode, it obeys
+ pipe_sampler_view::u.tex.first_level and pipe_sampler_state::min_lod.
+ There is no way to override those two in shaders.
+
+.. math::
+
+ coord.x = src0.x
+
+ coord.y = src0.y
+
+ coord.z = src0.z
+
+ coord.w = none
+
+ lod = 0
+
+ unit = src1
+
+ dst = texture\_sample(unit, coord, lod)
+
+
.. opcode:: TXL - Texture Lookup With explicit LOD
for cube map array textures, the explicit lod value
@@ -918,10 +941,18 @@ XXX doesn't look like most of the opcodes really belong here.
four-component signed integer vector used to identify the single texel
accessed. 3 components + level. Just like texture instructions, an optional
offset vector is provided, which is subject to various driver restrictions
- (regarding range, source of offsets).
+ (regarding range, source of offsets). This instruction ignores the sampler
+ state.
+
TXF(uint_vec coord, int_vec offset).
+.. opcode:: TXF_LZ - Texel Fetch
+
+ This is the same as TXF with level = 0. Like TXF, it obeys
+ pipe_sampler_view::u.tex.first_level.
+
+
.. opcode:: TXQ - Texture Size Query
As per NV_gpu_program4, retrieve the dimensions of the texture depending on