Unconditional discard. Allowed in fragment shaders only.
+.. opcode:: DEMOTE - Demote Invocation to a Helper
+
+ This demotes the current invocation to a helper, but continues
+ execution (while KILL may or may not terminate the
+ invocation). After this runs, all the usual helper invocation rules
+ apply about discarding buffer and render target writes. This is
+ useful for having accurate derivatives in the other invocations
+ which have not been demoted.
+
+ Allowed in fragment shaders only.
+
+
+.. opcode:: READ_HELPER - Reads Invocation Helper Status
+
+ This is identical to ``TGSI_SEMANTIC_HELPER_INVOCATION``, except
+ this will read the current value, which might change as a result of
+ a ``DEMOTE`` instruction.
+
+ Allowed in fragment shaders only.
+
+
.. opcode:: TXB - Texture Lookup With Bias
for cube map array textures and shadow cube maps, the bias value
Presumably shadow 2d arrays and shadow 3d targets could use
this encoding too, but this is not legal.
- shadow cube map arrays are neither possible nor required.
+ if the target is a shadow cube map array, the reference value is in
+ src1.y.
.. math::
Presumably shadow 3d / 2d array / cube targets could use
this encoding too, but this is not legal.
- shadow cube map arrays are neither possible nor required.
+ if the target is a shadow cube map array, the reference value is in
+ src1.y.
.. math::
require another CAP is hw can do it natively. For now we lower that before
TGSI.
+ PIPE_CAP_TGSI_TG4_COMPONENT_IN_SWIZZLE changes the encoding so that component
+ is stored in the sampler source swizzle x.
+
.. math::
coord = src0
+ (without TGSI_TG4_COMPONENT_IN_SWIZZLE)
component = src1
dst = texture\_gather4 (unit, coord, component)
+ (with TGSI_TG4_COMPONENT_IN_SWIZZLE)
+ dst = texture\_gather4 (unit, coord)
+ component is encoded in sampler swizzle.
+
(with SM5 - cube array shadow)
.. math::
If per-sample shading is not in effect or the source resource or render
target is not multisampled, the result is (0.5, 0.5, undef, undef).
- NOTE: no driver has implemented this opcode yet (and no state tracker
+ NOTE: no driver has implemented this opcode yet (and no gallium frontend
emits it). This information is subject to change.
.. opcode:: SAMPLE_INFO
If per-sample shading is not in effect or the source resource or render
target is not multisampled, the result is (1, 0, 0, 0).
- NOTE: no driver has implemented this opcode yet (and no state tracker
+ NOTE: no driver has implemented this opcode yet (and no gallium frontend
emits it). This information is subject to change.
.. opcode:: LOD - level of detail
barrier in between.
+.. _bindlessopcodes:
+
+Bindless Opcodes
+^^^^^^^^^^^^^^^^
+
+These opcodes are for working with bindless sampler or image handles and
+require PIPE_CAP_BINDLESS_TEXTURE.
+
+.. opcode:: IMG2HND - Get a bindless handle for a image
+
+ Syntax: ``IMG2HND dst, image``
+
+ Example: ``IMG2HND TEMP[0], IMAGE[0]``
+
+ Sets 'dst' to a bindless handle for 'image'.
+
+.. opcode:: SAMP2HND - Get a bindless handle for a sampler
+
+ Syntax: ``SAMP2HND dst, sampler``
+
+ Example: ``SAMP2HND TEMP[0], SAMP[0]``
+
+ Sets 'dst' to a bindless handle for 'sampler'.
+
+
.. _threadsyncopcodes:
Inter-thread synchronization opcodes
resource[offset] = dst_x + src_x
+.. opcode:: ATOMFADD - Atomic floating point addition
+
+ Syntax: ``ATOMFADD dst, resource, offset, src``
+
+ Example: ``ATOMFADD TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
+
+ The following operation is performed atomically:
+
+.. math::
+
+ dst_x = resource[offset]
+
+ resource[offset] = dst_x + src_x
+
+
.. opcode:: ATOMXCHG - Atomic exchange
Syntax: ``ATOMXCHG dst, resource, offset, src``
resource[offset] = (dst_x > src_x ? dst_x : src_x)
+.. opcode:: ATOMINC_WRAP - Atomic increment + wrap around
+
+ Syntax: ``ATOMINC_WRAP dst, resource, offset, src``
+
+ Example: ``ATOMINC_WRAP TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
+
+ The following operation is performed atomically:
+
+.. math::
+
+ dst_x = resource[offset] + 1
+
+ resource[offset] = dst_x <= src_x ? dst_x : 0
+
+
+.. opcode:: ATOMDEC_WRAP - Atomic decrement + wrap around
+
+ Syntax: ``ATOMDEC_WRAP dst, resource, offset, src``
+
+ Example: ``ATOMDEC_WRAP TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
+
+ The following operation is performed atomically:
+
+.. math::
+
+ dst_x = resource[offset]
+
+ resource[offset] = (dst_x > 0 && dst_x < src_x) ? dst_x - 1 : 0
+
+
.. _interlaneopcodes:
Inter-lane opcodes
last vertex processing stage is used.
-TGSI_SEMANTIC_CULLDIST
-""""""""""""""""""""""
-
-Used as distance to plane for performing application-defined culling
-of individual primitives against a plane. When components of vertex
-elements are given this label, these values are assumed to be a
-float32 signed distance to a plane. Primitives will be completely
-discarded if the plane distance for all of the vertices in the
-primitive are < 0. If a vertex has a cull distance of NaN, that
-vertex counts as "out" (as if its < 0);
-The limits on both clip and cull distances are bound
-by the PIPE_MAX_CLIP_OR_CULL_DISTANCE_COUNT define which defines
-the maximum number of components that can be used to hold the
-distances and by the PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT
-which specifies the maximum number of registers which can be
-annotated with those semantics.
-
-
TGSI_SEMANTIC_CLIPDIST
""""""""""""""""""""""
``(1 << subgroup_invocation) - 1`` in arbitrary precision arithmetic.
+TGSI_SEMANTIC_VIEWPORT_MASK
+"""""""""""""""""""""""""""
+
+A bit mask of viewports to broadcast the current primitive to. See
+GL_NV_viewport_array2 for more details.
+
+
+TGSI_SEMANTIC_TESS_DEFAULT_OUTER_LEVEL
+""""""""""""""""""""""""""""""""""""""
+
+A system value equal to the default_outer_level array set via set_tess_level.
+
+
+TGSI_SEMANTIC_TESS_DEFAULT_INNER_LEVEL
+""""""""""""""""""""""""""""""""""""""
+
+A system value equal to the default_inner_level array set via set_tess_level.
+
+
Declaration Interpolate
^^^^^^^^^^^^^^^^^^^^^^^
that have failed the depth/stencil tests. This is only valid when
FS_EARLY_DEPTH_STENCIL is also specified.
+LAYER_VIEWPORT_RELATIVE
+"""""""""""""""""""""""
+
+When enabled, the TGSI_SEMATNIC_LAYER output value is relative to the
+current viewport. This is especially useful in conjunction with
+TGSI_SEMANTIC_VIEWPORT_MASK.
+
Texture Sampling and Texture Formats
------------------------------------
projects / mesa.git / blobdiff