Some instructions, like :opcode:`I2F`, permit re-interpretation of vector
components as integers. Other instructions permit using registers as
-two-component vectors with double precision; see :ref:`Double Opcodes`.
+two-component vectors with double precision; see :ref:`doubleopcodes`.
When an instruction has a scalar result, the result is usually copied into
each of the components of *dst*. When this happens, the result is said to be
.. math::
- dst.x = \lfloor src.x\rfloor
+ dst.x = (int) \lfloor src.x\rfloor
- dst.y = \lfloor src.y\rfloor
+ dst.y = (int) \lfloor src.y\rfloor
- dst.z = \lfloor src.z\rfloor
+ dst.z = (int) \lfloor src.z\rfloor
- dst.w = \lfloor src.w\rfloor
+ dst.w = (int) \lfloor src.w\rfloor
.. opcode:: MOV - Move
.. math::
- dst.x = 1
-
- dst.y = max(src.x, 0)
-
- dst.z = (src.x > 0) ? max(src.y, 0)^{clamp(src.w, -128, 128))} : 0
-
- dst.w = 1
+ dst.x &= 1 \\
+ dst.y &= max(src.x, 0) \\
+ dst.z &= (src.x > 0) ? max(src.y, 0)^{clamp(src.w, -128, 128))} : 0 \\
+ dst.w &= 1
.. opcode:: RCP - Reciprocal
.. math::
- dst.x = 2^{\lfloor src.x\rfloor}
-
- dst.y = src.x - \lfloor src.x\rfloor
-
- dst.z = 2^{src.x}
-
- dst.w = 1
+ dst.x &= 2^{\lfloor src.x\rfloor} \\
+ dst.y &= src.x - \lfloor src.x\rfloor \\
+ dst.z &= 2^{src.x} \\
+ dst.w &= 1
.. opcode:: LOG - Approximate Logarithm Base 2
.. math::
- dst.x = \lfloor\log_2{|src.x|}\rfloor
-
- dst.y = \frac{|src.x|}{2^{\lfloor\log_2{|src.x|}\rfloor}}
-
- dst.z = \log_2{|src.x|}
-
- dst.w = 1
+ dst.x &= \lfloor\log_2{|src.x|}\rfloor \\
+ dst.y &= \frac{|src.x|}{2^{\lfloor\log_2{|src.x|}\rfloor}} \\
+ dst.z &= \log_2{|src.x|} \\
+ dst.w &= 1
.. opcode:: MUL - Multiply
.. math::
- dst.x = 1
-
- dst.y = src0.y \times src1.y
-
- dst.z = src0.z
-
- dst.w = src1.w
+ dst.x &= 1\\
+ dst.y &= src0.y \times src1.y\\
+ dst.z &= src0.z\\
+ dst.w &= src1.w
.. opcode:: MIN - Minimum
.. math::
- dst.x = (src0.x < src1.x) ? 1 : 0
+ dst.x = (src0.x < src1.x) ? 1.0F : 0.0F
- dst.y = (src0.y < src1.y) ? 1 : 0
+ dst.y = (src0.y < src1.y) ? 1.0F : 0.0F
- dst.z = (src0.z < src1.z) ? 1 : 0
+ dst.z = (src0.z < src1.z) ? 1.0F : 0.0F
- dst.w = (src0.w < src1.w) ? 1 : 0
+ dst.w = (src0.w < src1.w) ? 1.0F : 0.0F
.. opcode:: SGE - Set On Greater Equal Than
.. math::
- dst.x = (src0.x >= src1.x) ? 1 : 0
+ dst.x = (src0.x >= src1.x) ? 1.0F : 0.0F
- dst.y = (src0.y >= src1.y) ? 1 : 0
+ dst.y = (src0.y >= src1.y) ? 1.0F : 0.0F
- dst.z = (src0.z >= src1.z) ? 1 : 0
+ dst.z = (src0.z >= src1.z) ? 1.0F : 0.0F
- dst.w = (src0.w >= src1.w) ? 1 : 0
+ dst.w = (src0.w >= src1.w) ? 1.0F : 0.0F
.. opcode:: MAD - Multiply And Add
dst.w = src0.w \times src1.w + src2.w
-.. opcode:: SUB - Subtract
-
-.. math::
-
- dst.x = src0.x - src1.x
-
- dst.y = src0.y - src1.y
-
- dst.z = src0.z - src1.z
-
- dst.w = src0.w - src1.w
-
-
.. opcode:: LRP - Linear Interpolate
.. math::
dst.w = src0.w \times src1.w + (1 - src0.w) \times src2.w
-.. opcode:: CND - Condition
+.. opcode:: FMA - Fused Multiply-Add
+
+Perform a * b + c with no intermediate rounding step.
.. math::
- dst.x = (src2.x > 0.5) ? src0.x : src1.x
+ dst.x = src0.x \times src1.x + src2.x
- dst.y = (src2.y > 0.5) ? src0.y : src1.y
+ dst.y = src0.y \times src1.y + src2.y
- dst.z = (src2.z > 0.5) ? src0.z : src1.z
+ dst.z = src0.z \times src1.z + src2.z
- dst.w = (src2.w > 0.5) ? src0.w : src1.w
+ dst.w = src0.w \times src1.w + src2.w
.. opcode:: DP2A - 2-component Dot Product And Add
dst.w = src.w - \lfloor src.w\rfloor
-.. opcode:: CLAMP - Clamp
-
-.. math::
-
- dst.x = clamp(src0.x, src1.x, src2.x)
-
- dst.y = clamp(src0.y, src1.y, src2.y)
-
- dst.z = clamp(src0.z, src1.z, src2.z)
-
- dst.w = clamp(src0.w, src1.w, src2.w)
-
-
.. opcode:: FLR - Floor
-This is identical to :opcode:`ARL`.
-
.. math::
dst.x = \lfloor src.x\rfloor
dst.w = 1
-.. opcode:: ABS - Absolute
-
-.. math::
-
- dst.x = |src.x|
-
- dst.y = |src.y|
-
- dst.z = |src.z|
-
- dst.w = |src.w|
-
-
-.. opcode:: RCC - Reciprocal Clamped
-
-This instruction replicates its result.
-
-XXX cleanup on aisle three
-
-.. math::
-
- dst = (1 / src.x) > 0 ? clamp(1 / src.x, 5.42101e-020, 1.884467e+019) : clamp(1 / src.x, -1.884467e+019, -5.42101e-020)
-
-
.. opcode:: DPH - Homogeneous Dot Product
This instruction replicates its result.
dst = \cos{src.x}
-.. opcode:: DDX - Derivative Relative To X
+.. opcode:: DDX, DDX_FINE - Derivative Relative To X
+
+The fine variant is only used when ``PIPE_CAP_TGSI_FS_FINE_DERIVATIVE`` is
+advertised. When it is, the fine version guarantees one derivative per row
+while DDX is allowed to be the same for the entire 2x2 quad.
.. math::
dst.w = partialx(src.w)
-.. opcode:: DDY - Derivative Relative To Y
+.. opcode:: DDY, DDY_FINE - Derivative Relative To Y
+
+The fine variant is only used when ``PIPE_CAP_TGSI_FS_FINE_DERIVATIVE`` is
+advertised. When it is, the fine version guarantees one derivative per column
+while DDY is allowed to be the same for the entire 2x2 quad.
.. math::
.. opcode:: PK2H - Pack Two 16-bit Floats
- TBD
+This instruction replicates its result.
+
+.. math::
+
+ dst = f32\_to\_f16(src.x) | f32\_to\_f16(src.y) << 16
.. opcode:: PK2US - Pack Two Unsigned 16-bit Scalars
TBD
-.. opcode:: RFL - Reflection Vector
-
-.. math::
-
- dst.x = 2 \times (src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z) / (src0.x \times src0.x + src0.y \times src0.y + src0.z \times src0.z) \times src0.x - src1.x
-
- dst.y = 2 \times (src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z) / (src0.x \times src0.x + src0.y \times src0.y + src0.z \times src0.z) \times src0.y - src1.y
-
- dst.z = 2 \times (src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z) / (src0.x \times src0.x + src0.y \times src0.y + src0.z \times src0.z) \times src0.z - src1.z
-
- dst.w = 1
-
-.. note::
-
- Considered for removal.
-
-
.. opcode:: SEQ - Set On Equal
.. math::
dst.w = (src0.w == src1.w) ? 1.0F : 0.0F
-.. opcode:: SFL - Set On False
-
-This instruction replicates its result.
-
-.. math::
-
- dst = 0
-
-.. note::
-
- Considered for removal.
-
-
.. opcode:: SGT - Set On Greater Than
.. math::
dst.w = (src0.w != src1.w) ? 1.0F : 0.0F
-.. opcode:: STR - Set On True
+.. opcode:: TEX - Texture Lookup
-This instruction replicates its result.
+ for array textures src0.y contains the slice for 1D,
+ and src0.z contain the slice for 2D.
+
+ for shadow textures with no arrays (and not cube map),
+ src0.z contains the reference value.
+
+ for shadow textures with arrays, src0.z contains
+ the reference value for 1D arrays, and src0.w contains
+ the reference value for 2D arrays and cube maps.
+
+ for cube map array shadow textures, the reference value
+ cannot be passed in src0.w, and TEX2 must be used instead.
.. math::
- dst = 1
+ coord = src0
+ shadow_ref = src0.z or src0.w (optional)
-.. opcode:: TEX - Texture Lookup
+ unit = src1
+
+ dst = texture\_sample(unit, coord, shadow_ref)
+
+
+.. opcode:: TEX2 - Texture Lookup (for shadow cube map arrays only)
+
+ this is the same as TEX, but uses another reg to encode the
+ reference value.
.. math::
coord = src0
- bias = 0.0
+ shadow_ref = src1.x
+
+ unit = src2
+
+ dst = texture\_sample(unit, coord, shadow_ref)
+
- dst = texture_sample(unit, coord, bias)
- for array textures src0.y contains the slice for 1D,
- and src0.z contain the slice for 2D.
- for shadow textures with no arrays, src0.z contains
- the reference value.
- for shadow textures with arrays, src0.z contains
- the reference value for 1D arrays, and src0.w contains
- the reference value for 2D arrays.
- There is no way to pass a bias in the .w value for
- shadow arrays, and GLSL doesn't allow this.
- GLSL does allow cube shadows maps to take a bias value,
- and we have to determine how this will look in TGSI.
.. opcode:: TXD - Texture Lookup with Derivatives
ddy = src2
- bias = 0.0
+ unit = src3
- dst = texture_sample_deriv(unit, coord, bias, ddx, ddy)
+ dst = texture\_sample\_deriv(unit, coord, ddx, ddy)
.. opcode:: TXP - Projective Texture Lookup
.. math::
- coord.x = src0.x / src.w
+ coord.x = src0.x / src0.w
- coord.y = src0.y / src.w
+ coord.y = src0.y / src0.w
- coord.z = src0.z / src.w
+ coord.z = src0.z / src0.w
coord.w = src0.w
- bias = 0.0
+ unit = src1
- dst = texture_sample(unit, coord, bias)
+ dst = texture\_sample(unit, coord)
.. opcode:: UP2H - Unpack Two 16-Bit Floats
- TBD
+.. math::
-.. note::
+ dst.x = f16\_to\_f32(src0.x \& 0xffff)
- Considered for removal.
+ dst.y = f16\_to\_f32(src0.x >> 16)
-.. opcode:: UP2US - Unpack Two Unsigned 16-Bit Scalars
+ dst.z = f16\_to\_f32(src0.x \& 0xffff)
- TBD
+ dst.w = f16\_to\_f32(src0.x >> 16)
.. note::
Considered for removal.
-.. opcode:: UP4B - Unpack Four Signed 8-Bit Values
+.. opcode:: UP2US - Unpack Two Unsigned 16-Bit Scalars
TBD
Considered for removal.
-.. opcode:: UP4UB - Unpack Four Unsigned 8-Bit Scalars
+.. opcode:: UP4B - Unpack Four Signed 8-Bit Values
TBD
Considered for removal.
-.. opcode:: X2D - 2D Coordinate Transformation
-
-.. math::
-
- dst.x = src0.x + src1.x \times src2.x + src1.y \times src2.y
-
- dst.y = src0.y + src1.x \times src2.z + src1.y \times src2.w
-
- dst.z = src0.x + src1.x \times src2.x + src1.y \times src2.y
-
- dst.w = src0.y + src1.x \times src2.z + src1.y \times src2.w
-
-.. note::
-
- Considered for removal.
-
-
-.. opcode:: ARA - Address Register Add
+.. opcode:: UP4UB - Unpack Four Unsigned 8-Bit Scalars
TBD
Considered for removal.
+
.. opcode:: ARR - Address Register Load With Round
.. math::
- dst.x = round(src.x)
+ dst.x = (int) round(src.x)
- dst.y = round(src.y)
+ dst.y = (int) round(src.y)
- dst.z = round(src.z)
+ dst.z = (int) round(src.z)
- dst.w = round(src.w)
+ dst.w = (int) round(src.w)
.. opcode:: SSG - Set Sign
.. opcode:: TXB - Texture Lookup With Bias
+ for cube map array textures and shadow cube maps, the bias value
+ cannot be passed in src0.w, and TXB2 must be used instead.
+
+ if the target is a shadow texture, the reference value is always
+ in src.z (this prevents shadow 3d and shadow 2d arrays from
+ using this instruction, but this is not needed).
+
.. math::
- coord.x = src.x
+ coord.x = src0.x
+
+ coord.y = src0.y
+
+ coord.z = src0.z
+
+ coord.w = none
- coord.y = src.y
+ bias = src0.w
- coord.z = src.z
+ unit = src1
- coord.w = 1.0
+ dst = texture\_sample(unit, coord, bias)
- bias = src.z
- dst = texture_sample(unit, coord, bias)
+.. opcode:: TXB2 - Texture Lookup With Bias (some cube maps only)
+ this is the same as TXB, but uses another reg to encode the
+ lod bias value for cube map arrays and shadow cube maps.
+ Presumably shadow 2d arrays and shadow 3d targets could use
+ this encoding too, but this is not legal.
-.. opcode:: NRM - 3-component Vector Normalise
+ shadow cube map arrays are neither possible nor required.
.. math::
- dst.x = src.x / (src.x \times src.x + src.y \times src.y + src.z \times src.z)
+ coord = src0
- dst.y = src.y / (src.x \times src.x + src.y \times src.y + src.z \times src.z)
+ bias = src1.x
- dst.z = src.z / (src.x \times src.x + src.y \times src.y + src.z \times src.z)
+ unit = src2
- dst.w = 1
+ dst = texture\_sample(unit, coord, bias)
.. opcode:: DIV - Divide
.. opcode:: TXL - Texture Lookup With explicit LOD
+ for cube map array textures, the explicit lod value
+ cannot be passed in src0.w, and TXL2 must be used instead.
+
+ if the target is a shadow texture, the reference value is always
+ in src.z (this prevents shadow 3d / 2d array / cube targets from
+ using this instruction, but this is not needed).
+
.. math::
coord.x = src0.x
coord.z = src0.z
- coord.w = 1.0
+ coord.w = none
lod = src0.w
- dst = texture_sample(unit, coord, lod)
+ unit = src1
+
+ dst = texture\_sample(unit, coord, lod)
+
+
+.. opcode:: TXL2 - Texture Lookup With explicit LOD (for cube map arrays only)
+
+ this is the same as TXL, but uses another reg to encode the
+ explicit lod value.
+ 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.
+
+.. math::
+
+ coord = src0
+
+ lod = src1.x
+
+ unit = src2
+
+ dst = texture\_sample(unit, coord, lod)
.. opcode:: PUSHA - Push Address Register On Stack
Considered for removal.
-.. opcode:: BRA - Branch
-
- pc = target
-
-.. note::
-
- Considered for removal.
-
-
.. opcode:: CALLNZ - Subroutine Call If Not Zero
TBD
dst.w = |src0.w - src1.w| + src2.w
-.. opcode:: TXF - Texel Fetch (as per NV_gpu_shader4), extract a single texel
- from a specified texture image. The source sampler may
- not be a CUBE or SHADOW.
- src 0 is a four-component signed integer vector used to
- identify the single texel accessed. 3 components + level.
- src 1 is a 3 component constant signed integer vector,
- with each component only have a range of
- -8..+8 (hw only seems to deal with this range, interface
- allows for up to unsigned int).
- TXF(uint_vec coord, int_vec offset).
+.. opcode:: TXF - Texel Fetch
+
+ As per NV_gpu_shader4, extract a single texel from a specified texture
+ image. The source sampler may not be a CUBE or SHADOW. src 0 is a
+ 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).
+ TXF(uint_vec coord, int_vec offset).
-.. opcode:: TXQ - Texture Size Query (as per NV_gpu_program4)
- retrieve the dimensions of the texture
- depending on the target. For 1D (width), 2D/RECT/CUBE
- (width, height), 3D (width, height, depth),
- 1D array (width, layers), 2D array (width, height, layers)
+.. opcode:: TXQ - Texture Size Query
+
+ As per NV_gpu_program4, retrieve the dimensions of the texture depending on
+ the target. For 1D (width), 2D/RECT/CUBE (width, height), 3D (width, height,
+ depth), 1D array (width, layers), 2D array (width, height, layers).
+ Also return the number of accessible levels (last_level - first_level + 1)
+ in W.
+
+ For components which don't return a resource dimension, their value
+ is undefined.
.. math::
lod = src0.x
- dst.x = texture_width(unit, lod)
+ dst.x = texture\_width(unit, lod)
+
+ dst.y = texture\_height(unit, lod)
+
+ dst.z = texture\_depth(unit, lod)
+
+ dst.w = texture\_levels(unit)
+
+
+.. opcode:: TXQS - Texture Samples Query
+
+ This retrieves the number of samples in the texture, and stores it
+ into the x component. The other components are undefined.
+
+.. math::
+
+ dst.x = texture\_samples(unit)
+
+
+.. opcode:: TG4 - Texture Gather
+
+ As per ARB_texture_gather, gathers the four texels to be used in a bi-linear
+ filtering operation and packs them into a single register. Only works with
+ 2D, 2D array, cubemaps, and cubemaps arrays. For 2D textures, only the
+ addressing modes of the sampler and the top level of any mip pyramid are
+ used. Set W to zero. It behaves like the TEX instruction, but a filtered
+ sample is not generated. The four samples that contribute to filtering are
+ placed into xyzw in clockwise order, starting with the (u,v) texture
+ coordinate delta at the following locations (-, +), (+, +), (+, -), (-, -),
+ where the magnitude of the deltas are half a texel.
+
+ PIPE_CAP_TEXTURE_SM5 enhances this instruction to support shadow per-sample
+ depth compares, single component selection, and a non-constant offset. It
+ doesn't allow support for the GL independent offset to get i0,j0. This would
+ require another CAP is hw can do it natively. For now we lower that before
+ TGSI.
+
+.. math::
+
+ coord = src0
+
+ component = src1
+
+ dst = texture\_gather4 (unit, coord, component)
+
+(with SM5 - cube array shadow)
+
+.. math::
+
+ coord = src0
- dst.y = texture_height(unit, lod)
+ compare = src1
- dst.z = texture_depth(unit, lod)
+ dst = texture\_gather (uint, coord, compare)
+.. opcode:: LODQ - level of detail query
+
+ Compute the LOD information that the texture pipe would use to access the
+ texture. The Y component contains the computed LOD lambda_prime. The X
+ component contains the LOD that will be accessed, based on min/max lod's
+ and mipmap filters.
+
+.. math::
+
+ coord = src0
+
+ dst.xy = lodq(uint, coord);
Integer ISA
^^^^^^^^^^^^^^^^^^^^^^^^
.. math::
- dst.x = ~src.x
+ dst.x = \sim src.x
- dst.y = ~src.y
+ dst.y = \sim src.y
- dst.z = ~src.z
+ dst.z = \sim src.z
- dst.w = ~src.w
+ dst.w = \sim src.w
.. opcode:: AND - Bitwise And
.. math::
- dst.x = src0.x & src1.x
+ dst.x = src0.x \& src1.x
- dst.y = src0.y & src1.y
+ dst.y = src0.y \& src1.y
- dst.z = src0.z & src1.z
+ dst.z = src0.z \& src1.z
- dst.w = src0.w & src1.w
+ dst.w = src0.w \& src1.w
.. opcode:: OR - Bitwise Or
.. math::
- dst.x = src0.x << (0x1f & src1.x)
+ dst.x = src0.x << (0x1f \& src1.x)
- dst.y = src0.y << (0x1f & src1.y)
+ dst.y = src0.y << (0x1f \& src1.y)
- dst.z = src0.z << (0x1f & src1.z)
+ dst.z = src0.z << (0x1f \& src1.z)
- dst.w = src0.w << (0x1f & src1.w)
+ dst.w = src0.w << (0x1f \& src1.w)
.. opcode:: ISHR - Arithmetic Shift Right (of Signed Integer)
.. math::
- dst.x = src0.x >> (0x1f & src1.x)
+ dst.x = src0.x >> (0x1f \& src1.x)
- dst.y = src0.y >> (0x1f & src1.y)
+ dst.y = src0.y >> (0x1f \& src1.y)
- dst.z = src0.z >> (0x1f & src1.z)
+ dst.z = src0.z >> (0x1f \& src1.z)
- dst.w = src0.w >> (0x1f & src1.w)
+ dst.w = src0.w >> (0x1f \& src1.w)
.. opcode:: USHR - Logical Shift Right
.. math::
- dst.x = src0.x >> (unsigned) (0x1f & src1.x)
+ dst.x = src0.x >> (unsigned) (0x1f \& src1.x)
- dst.y = src0.y >> (unsigned) (0x1f & src1.y)
+ dst.y = src0.y >> (unsigned) (0x1f \& src1.y)
- dst.z = src0.z >> (unsigned) (0x1f & src1.z)
+ dst.z = src0.z >> (unsigned) (0x1f \& src1.z)
- dst.w = src0.w >> (unsigned) (0x1f & src1.w)
+ dst.w = src0.w >> (unsigned) (0x1f \& src1.w)
.. opcode:: UCMP - Integer Conditional Move
.. math::
- dst.x = (src0.x < src1.x) ? ~0 : 0
+ dst.x = (src0.x < src1.x) ? \sim 0 : 0
- dst.y = (src0.y < src1.y) ? ~0 : 0
+ dst.y = (src0.y < src1.y) ? \sim 0 : 0
- dst.z = (src0.z < src1.z) ? ~0 : 0
+ dst.z = (src0.z < src1.z) ? \sim 0 : 0
- dst.w = (src0.w < src1.w) ? ~0 : 0
+ dst.w = (src0.w < src1.w) ? \sim 0 : 0
.. opcode:: ISLT - Signed Integer Set On Less Than
.. math::
- dst.x = (src0.x < src1.x) ? ~0 : 0
+ dst.x = (src0.x < src1.x) ? \sim 0 : 0
- dst.y = (src0.y < src1.y) ? ~0 : 0
+ dst.y = (src0.y < src1.y) ? \sim 0 : 0
- dst.z = (src0.z < src1.z) ? ~0 : 0
+ dst.z = (src0.z < src1.z) ? \sim 0 : 0
- dst.w = (src0.w < src1.w) ? ~0 : 0
+ dst.w = (src0.w < src1.w) ? \sim 0 : 0
.. opcode:: USLT - Unsigned Integer Set On Less Than
.. math::
- dst.x = (src0.x < src1.x) ? ~0 : 0
+ dst.x = (src0.x < src1.x) ? \sim 0 : 0
- dst.y = (src0.y < src1.y) ? ~0 : 0
+ dst.y = (src0.y < src1.y) ? \sim 0 : 0
- dst.z = (src0.z < src1.z) ? ~0 : 0
+ dst.z = (src0.z < src1.z) ? \sim 0 : 0
- dst.w = (src0.w < src1.w) ? ~0 : 0
+ dst.w = (src0.w < src1.w) ? \sim 0 : 0
.. opcode:: FSGE - Float Set On Greater Equal Than (ordered)
.. math::
- dst.x = (src0.x >= src1.x) ? ~0 : 0
+ dst.x = (src0.x >= src1.x) ? \sim 0 : 0
- dst.y = (src0.y >= src1.y) ? ~0 : 0
+ dst.y = (src0.y >= src1.y) ? \sim 0 : 0
- dst.z = (src0.z >= src1.z) ? ~0 : 0
+ dst.z = (src0.z >= src1.z) ? \sim 0 : 0
- dst.w = (src0.w >= src1.w) ? ~0 : 0
+ dst.w = (src0.w >= src1.w) ? \sim 0 : 0
.. opcode:: ISGE - Signed Integer Set On Greater Equal Than
.. math::
- dst.x = (src0.x >= src1.x) ? ~0 : 0
+ dst.x = (src0.x >= src1.x) ? \sim 0 : 0
- dst.y = (src0.y >= src1.y) ? ~0 : 0
+ dst.y = (src0.y >= src1.y) ? \sim 0 : 0
- dst.z = (src0.z >= src1.z) ? ~0 : 0
+ dst.z = (src0.z >= src1.z) ? \sim 0 : 0
- dst.w = (src0.w >= src1.w) ? ~0 : 0
+ dst.w = (src0.w >= src1.w) ? \sim 0 : 0
.. opcode:: USGE - Unsigned Integer Set On Greater Equal Than
.. math::
- dst.x = (src0.x >= src1.x) ? ~0 : 0
+ dst.x = (src0.x >= src1.x) ? \sim 0 : 0
- dst.y = (src0.y >= src1.y) ? ~0 : 0
+ dst.y = (src0.y >= src1.y) ? \sim 0 : 0
- dst.z = (src0.z >= src1.z) ? ~0 : 0
+ dst.z = (src0.z >= src1.z) ? \sim 0 : 0
- dst.w = (src0.w >= src1.w) ? ~0 : 0
+ dst.w = (src0.w >= src1.w) ? \sim 0 : 0
.. opcode:: FSEQ - Float Set On Equal (ordered)
.. math::
- dst.x = (src0.x == src1.x) ? ~0 : 0
+ dst.x = (src0.x == src1.x) ? \sim 0 : 0
- dst.y = (src0.y == src1.y) ? ~0 : 0
+ dst.y = (src0.y == src1.y) ? \sim 0 : 0
- dst.z = (src0.z == src1.z) ? ~0 : 0
+ dst.z = (src0.z == src1.z) ? \sim 0 : 0
- dst.w = (src0.w == src1.w) ? ~0 : 0
+ dst.w = (src0.w == src1.w) ? \sim 0 : 0
.. opcode:: USEQ - Integer Set On Equal
.. math::
- dst.x = (src0.x == src1.x) ? ~0 : 0
+ dst.x = (src0.x == src1.x) ? \sim 0 : 0
- dst.y = (src0.y == src1.y) ? ~0 : 0
+ dst.y = (src0.y == src1.y) ? \sim 0 : 0
- dst.z = (src0.z == src1.z) ? ~0 : 0
+ dst.z = (src0.z == src1.z) ? \sim 0 : 0
- dst.w = (src0.w == src1.w) ? ~0 : 0
+ dst.w = (src0.w == src1.w) ? \sim 0 : 0
.. opcode:: FSNE - Float Set On Not Equal (unordered)
.. math::
- dst.x = (src0.x != src1.x) ? ~0 : 0
+ dst.x = (src0.x != src1.x) ? \sim 0 : 0
- dst.y = (src0.y != src1.y) ? ~0 : 0
+ dst.y = (src0.y != src1.y) ? \sim 0 : 0
- dst.z = (src0.z != src1.z) ? ~0 : 0
+ dst.z = (src0.z != src1.z) ? \sim 0 : 0
- dst.w = (src0.w != src1.w) ? ~0 : 0
+ dst.w = (src0.w != src1.w) ? \sim 0 : 0
.. opcode:: USNE - Integer Set On Not Equal
.. math::
- dst.x = (src0.x != src1.x) ? ~0 : 0
+ dst.x = (src0.x != src1.x) ? \sim 0 : 0
- dst.y = (src0.y != src1.y) ? ~0 : 0
+ dst.y = (src0.y != src1.y) ? \sim 0 : 0
- dst.z = (src0.z != src1.z) ? ~0 : 0
+ dst.z = (src0.z != src1.z) ? \sim 0 : 0
- dst.w = (src0.w != src1.w) ? ~0 : 0
+ dst.w = (src0.w != src1.w) ? \sim 0 : 0
.. opcode:: INEG - Integer Negate
dst.w = |src.w|
+Bitwise ISA
+^^^^^^^^^^^
+These opcodes are used for bit-level manipulation of integers.
+
+.. opcode:: IBFE - Signed Bitfield Extract
+
+ Like GLSL bitfieldExtract. Extracts a set of bits from the input, and
+ sign-extends them if the high bit of the extracted window is set.
+
+ Pseudocode::
+
+ def ibfe(value, offset, bits):
+ if offset < 0 or bits < 0 or offset + bits > 32:
+ return undefined
+ if bits == 0: return 0
+ # Note: >> sign-extends
+ return (value << (32 - offset - bits)) >> (32 - bits)
+
+.. opcode:: UBFE - Unsigned Bitfield Extract
+
+ Like GLSL bitfieldExtract. Extracts a set of bits from the input, without
+ any sign-extension.
+
+ Pseudocode::
+
+ def ubfe(value, offset, bits):
+ if offset < 0 or bits < 0 or offset + bits > 32:
+ return undefined
+ if bits == 0: return 0
+ # Note: >> does not sign-extend
+ return (value << (32 - offset - bits)) >> (32 - bits)
+
+.. opcode:: BFI - Bitfield Insert
+
+ Like GLSL bitfieldInsert. Replaces a bit region of 'base' with the low bits
+ of 'insert'.
+
+ Pseudocode::
+
+ def bfi(base, insert, offset, bits):
+ if offset < 0 or bits < 0 or offset + bits > 32:
+ return undefined
+ # << defined such that mask == ~0 when bits == 32, offset == 0
+ mask = ((1 << bits) - 1) << offset
+ return ((insert << offset) & mask) | (base & ~mask)
+
+.. opcode:: BREV - Bitfield Reverse
+
+ See SM5 instruction BFREV. Reverses the bits of the argument.
+
+.. opcode:: POPC - Population Count
+
+ See SM5 instruction COUNTBITS. Counts the number of set bits in the argument.
+
+.. opcode:: LSB - Index of lowest set bit
+
+ See SM5 instruction FIRSTBIT_LO. Computes the 0-based index of the first set
+ bit of the argument. Returns -1 if none are set.
+
+.. opcode:: IMSB - Index of highest non-sign bit
+
+ See SM5 instruction FIRSTBIT_SHI. Computes the 0-based index of the highest
+ non-sign bit of the argument (i.e. highest 0 bit for negative numbers,
+ highest 1 bit for positive numbers). Returns -1 if all bits are the same
+ (i.e. for inputs 0 and -1).
+
+.. opcode:: UMSB - Index of highest set bit
+
+ See SM5 instruction FIRSTBIT_HI. Computes the 0-based index of the highest
+ set bit of the argument. Returns -1 if none are set.
Geometry ISA
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. opcode:: EMIT - Emit
- Generate a new vertex for the current primitive using the values in the
- output registers.
+ Generate a new vertex for the current primitive into the specified vertex
+ stream using the values in the output registers.
.. opcode:: ENDPRIM - End Primitive
- Complete the current primitive (consisting of the emitted vertices),
- and start a new one.
+ Complete the current primitive in the specified vertex stream (consisting of
+ the emitted vertices), and start a new one.
GLSL ISA
just as last statement, and fallthrough is allowed into/from it.
CASE src arguments are evaluated at bit level against the SWITCH src argument.
- Example:
- SWITCH src[0].x
- CASE src[0].x
- (some instructions here)
- (optional BRK here)
- DEFAULT
- (some instructions here)
- (optional BRK here)
- CASE src[0].x
- (some instructions here)
- (optional BRK here)
- ENDSWITCH
+ Example::
+
+ SWITCH src[0].x
+ CASE src[0].x
+ (some instructions here)
+ (optional BRK here)
+ DEFAULT
+ (some instructions here)
+ (optional BRK here)
+ CASE src[0].x
+ (some instructions here)
+ (optional BRK here)
+ ENDSWITCH
.. opcode:: CASE - Switch case
Ends a switch expression.
-.. opcode:: NRM4 - 4-component Vector Normalise
+Interpolation ISA
+^^^^^^^^^^^^^^^^^
-This instruction replicates its result.
+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``.
-.. math::
+.. opcode:: INTERP_CENTROID - Interpolate at the centroid
+
+ Interpolates the varying specified by src0 at the centroid
- dst = \frac{src.x}{src.x \times src.x + src.y \times src.y + src.z \times src.z + src.w \times src.w}
+.. 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:
The double-precision opcodes reinterpret four-component vectors into
two-component vectors with doubled precision in each component.
-Support for these opcodes is XXX undecided. :T
+.. opcode:: DABS - Absolute
+
+.. math::
+
+ dst.xy = |src0.xy|
+ dst.zw = |src0.zw|
.. opcode:: DADD - Add
dst.zw = src0.zw + src1.zw
-
-.. opcode:: DDIV - Divide
+.. opcode:: DSEQ - Set on Equal
.. math::
- dst.xy = src0.xy / src1.xy
+ dst.x = src0.xy == src1.xy ? \sim 0 : 0
- dst.zw = src0.zw / src1.zw
+ dst.z = src0.zw == src1.zw ? \sim 0 : 0
-.. opcode:: DSEQ - Set on Equal
+.. opcode:: DSNE - Set on Equal
.. math::
- dst.xy = src0.xy == src1.xy ? 1.0F : 0.0F
+ dst.x = src0.xy != src1.xy ? \sim 0 : 0
- dst.zw = src0.zw == src1.zw ? 1.0F : 0.0F
+ dst.z = src0.zw != src1.zw ? \sim 0 : 0
.. opcode:: DSLT - Set on Less than
.. math::
- dst.xy = src0.xy < src1.xy ? 1.0F : 0.0F
+ dst.x = src0.xy < src1.xy ? \sim 0 : 0
+
+ dst.z = src0.zw < src1.zw ? \sim 0 : 0
+
+.. opcode:: DSGE - Set on Greater equal
+
+.. math::
+
+ dst.x = src0.xy >= src1.xy ? \sim 0 : 0
- dst.zw = src0.zw < src1.zw ? 1.0F : 0.0F
+ dst.z = src0.zw >= src1.zw ? \sim 0 : 0
.. opcode:: DFRAC - Fraction
dst.zw = src.zw - \lfloor src.zw\rfloor
+.. opcode:: DTRUNC - Truncate
-.. opcode:: DFRACEXP - Convert Number to Fractional and Integral Components
+.. math::
-Like the ``frexp()`` routine in many math libraries, this opcode stores the
-exponent of its source to ``dst0``, and the significand to ``dst1``, such that
-:math:`dst1 \times 2^{dst0} = src` .
+ dst.xy = trunc(src.xy)
+
+ dst.zw = trunc(src.zw)
+
+.. opcode:: DCEIL - Ceiling
.. math::
- dst0.xy = exp(src.xy)
+ dst.xy = \lceil src.xy\rceil
- dst1.xy = frac(src.xy)
+ dst.zw = \lceil src.zw\rceil
+
+.. opcode:: DFLR - Floor
+
+.. math::
+
+ dst.xy = \lfloor src.xy\rfloor
+
+ dst.zw = \lfloor src.zw\rfloor
+
+.. opcode:: DROUND - Fraction
+
+.. math::
+
+ dst.xy = round(src.xy)
+
+ dst.zw = round(src.zw)
+
+.. opcode:: DSSG - Set Sign
+
+.. math::
+
+ dst.xy = (src.xy > 0) ? 1.0 : (src.xy < 0) ? -1.0 : 0.0
+
+ dst.zw = (src.zw > 0) ? 1.0 : (src.zw < 0) ? -1.0 : 0.0
+
+.. opcode:: DFRACEXP - Convert Number to Fractional and Integral Components
+
+Like the ``frexp()`` routine in many math libraries, this opcode stores the
+exponent of its source to ``dst0``, and the significand to ``dst1``, such that
+:math:`dst1 \times 2^{dst0} = src` .
+
+.. math::
+
+ dst0.xy = exp(src.xy)
+
+ dst1.xy = frac(src.xy)
dst0.zw = exp(src.zw)
.. opcode:: DLDEXP - Multiply Number by Integral Power of 2
-This opcode is the inverse of :opcode:`DFRACEXP`.
+This opcode is the inverse of :opcode:`DFRACEXP`. The second
+source is an integer.
.. math::
- dst.xy = src0.xy \times 2^{src1.xy}
+ dst.xy = src0.xy \times 2^{src1.x}
- dst.zw = src0.zw \times 2^{src1.zw}
+ dst.zw = src0.zw \times 2^{src1.y}
.. opcode:: DMIN - Minimum
dst.zw = src0.zw \times src1.zw + src2.zw
+.. opcode:: DFMA - Fused Multiply-Add
+
+Perform a * b + c with no intermediate rounding step.
+
+.. math::
+
+ dst.xy = src0.xy \times src1.xy + src2.xy
+
+ dst.zw = src0.zw \times src1.zw + src2.zw
+
+
+.. opcode:: DDIV - Divide
+
+.. math::
+
+ dst.xy = \frac{src0.xy}{src1.xy}
+
+ dst.zw = \frac{src0.zw}{src1.zw}
+
+
.. opcode:: DRCP - Reciprocal
.. math::
dst.zw = \sqrt{src.zw}
+.. opcode:: DRSQ - Reciprocal Square Root
+
+.. math::
+
+ dst.xy = \frac{1}{\sqrt{src.xy}}
+
+ dst.zw = \frac{1}{\sqrt{src.zw}}
+
+.. opcode:: F2D - Float to Double
+
+.. math::
+
+ dst.xy = double(src0.x)
+
+ dst.zw = double(src0.y)
+
+.. opcode:: D2F - Double to Float
+
+.. math::
+
+ dst.x = float(src0.xy)
+
+ dst.y = float(src0.zw)
+
+.. opcode:: I2D - Int to Double
+
+.. math::
+
+ dst.xy = double(src0.x)
+
+ dst.zw = double(src0.y)
+
+.. opcode:: D2I - Double to Int
+
+.. math::
+
+ dst.x = int(src0.xy)
+
+ dst.y = int(src0.zw)
+
+.. opcode:: U2D - Unsigned Int to Double
+
+.. math::
+
+ dst.xy = double(src0.x)
+
+ dst.zw = double(src0.y)
+
+.. opcode:: D2U - Double to Unsigned Int
+
+.. math::
+
+ dst.x = unsigned(src0.xy)
+
+ dst.y = unsigned(src0.zw)
+
+64-bit Integer ISA
+^^^^^^^^^^^^^^^^^^
+
+The 64-bit integer opcodes reinterpret four-component vectors into
+two-component vectors with 64-bits in each component.
+
+.. opcode:: I64ABS - 64-bit Integer Absolute Value
+
+.. math::
+
+ dst.xy = |src0.xy|
+ dst.zw = |src0.zw|
+
+.. opcode:: I64NEG - 64-bit Integer Negate
+
+ Two's complement.
+
+.. math::
+
+ dst.xy = -src.xy
+ dst.zw = -src.zw
+
+.. opcode:: I64SSG - 64-bit Integer Set Sign
+
+.. math::
+
+ dst.xy = (src0.xy < 0) ? -1 : (src0.xy > 0) ? 1 : 0
+ dst.zw = (src0.zw < 0) ? -1 : (src0.zw > 0) ? 1 : 0
+
+.. opcode:: U64ADD - 64-bit Integer Add
+
+.. math::
+
+ dst.xy = src0.xy + src1.xy
+ dst.zw = src0.zw + src1.zw
+
+.. opcode:: U64MUL - 64-bit Integer Multiply
+
+.. math::
+
+ dst.xy = src0.xy * src1.xy
+ dst.zw = src0.zw * src1.zw
+
+.. opcode:: U64SEQ - 64-bit Integer Set on Equal
+
+.. math::
+
+ dst.x = src0.xy == src1.xy ? \sim 0 : 0
+ dst.z = src0.zw == src1.zw ? \sim 0 : 0
+
+.. opcode:: U64SNE - 64-bit Integer Set on Not Equal
+
+.. math::
+
+ dst.x = src0.xy != src1.xy ? \sim 0 : 0
+ dst.z = src0.zw != src1.zw ? \sim 0 : 0
+
+.. opcode:: U64SLT - 64-bit Unsigned Integer Set on Less Than
+
+.. math::
+
+ dst.x = src0.xy < src1.xy ? \sim 0 : 0
+ dst.z = src0.zw < src1.zw ? \sim 0 : 0
+
+.. opcode:: U64SGE - 64-bit Unsigned Integer Set on Greater Equal
+
+.. math::
+
+ dst.x = src0.xy >= src1.xy ? \sim 0 : 0
+ dst.z = src0.zw >= src1.zw ? \sim 0 : 0
+
+.. opcode:: I64SLT - 64-bit Signed Integer Set on Less Than
+
+.. math::
+
+ dst.x = src0.xy < src1.xy ? \sim 0 : 0
+ dst.z = src0.zw < src1.zw ? \sim 0 : 0
+
+.. opcode:: I64SGE - 64-bit Signed Integer Set on Greater Equal
+
+.. math::
+
+ dst.x = src0.xy >= src1.xy ? \sim 0 : 0
+ dst.z = src0.zw >= src1.zw ? \sim 0 : 0
+
+.. opcode:: I64MIN - Minimum of 64-bit Signed Integers
+
+.. math::
+
+ dst.xy = min(src0.xy, src1.xy)
+ dst.zw = min(src0.zw, src1.zw)
+
+.. opcode:: U64MIN - Minimum of 64-bit Unsigned Integers
+
+.. math::
+
+ dst.xy = min(src0.xy, src1.xy)
+ dst.zw = min(src0.zw, src1.zw)
+
+.. opcode:: I64MAX - Maximum of 64-bit Signed Integers
+
+.. math::
+
+ dst.xy = max(src0.xy, src1.xy)
+ dst.zw = max(src0.zw, src1.zw)
+
+.. opcode:: U64MAX - Maximum of 64-bit Unsigned Integers
+
+.. math::
+
+ dst.xy = max(src0.xy, src1.xy)
+ dst.zw = max(src0.zw, src1.zw)
+
+.. opcode:: U64SHL - Shift Left 64-bit Unsigned Integer
+
+ The shift count is masked with 0x3f before the shift is applied.
+
+.. math::
+
+ dst.xy = src0.xy << (0x3f \& src1.x)
+ dst.zw = src0.zw << (0x3f \& src1.y)
+
+.. opcode:: I64SHR - Arithmetic Shift Right (of 64-bit Signed Integer)
+
+ The shift count is masked with 0x3f before the shift is applied.
+
+.. math::
+
+ dst.xy = src0.xy >> (0x3f \& src1.x)
+ dst.zw = src0.zw >> (0x3f \& src1.y)
+
+.. opcode:: U64SHR - Logical Shift Right (of 64-bit Unsigned Integer)
+
+ The shift count is masked with 0x3f before the shift is applied.
+
+.. math::
+
+ dst.xy = src0.xy >> (unsigned) (0x3f \& src1.x)
+ dst.zw = src0.zw >> (unsigned) (0x3f \& src1.y)
+
+.. opcode:: I64DIV - 64-bit Signed Integer Division
+
+.. math::
+
+ dst.xy = src0.xy \ src1.xy
+ dst.zw = src0.zw \ src1.zw
+
+.. opcode:: U64DIV - 64-bit Unsigned Integer Division
+
+.. math::
+
+ dst.xy = src0.xy \ src1.xy
+ dst.zw = src0.zw \ src1.zw
+
+.. opcode:: U64MOD - 64-bit Unsigned Integer Remainder
+
+.. math::
+
+ dst.xy = src0.xy \bmod src1.xy
+ dst.zw = src0.zw \bmod src1.zw
+
+.. opcode:: I64MOD - 64-bit Signed Integer Remainder
+
+.. math::
+
+ dst.xy = src0.xy \bmod src1.xy
+ dst.zw = src0.zw \bmod src1.zw
+
+.. opcode:: F2U64 - Float to 64-bit Unsigned Int
+
+.. math::
+
+ dst.xy = (uint64_t) src0.x
+ dst.zw = (uint64_t) src0.y
+
+.. opcode:: F2I64 - Float to 64-bit Int
+
+.. math::
+
+ dst.xy = (int64_t) src0.x
+ dst.zw = (int64_t) src0.y
+
+.. opcode:: U2I64 - Unsigned Integer to 64-bit Integer
+
+ This is a zero extension.
+
+.. math::
+
+ dst.xy = (uint64_t) src0.x
+ dst.zw = (uint64_t) src0.y
+
+.. opcode:: I2I64 - Signed Integer to 64-bit Integer
+
+ This is a sign extension.
+
+.. math::
+
+ dst.xy = (int64_t) src0.x
+ dst.zw = (int64_t) src0.y
+
+.. opcode:: D2U64 - Double to 64-bit Unsigned Int
+
+.. math::
+
+ dst.xy = (uint64_t) src0.xy
+ dst.zw = (uint64_t) src0.zw
+
+.. opcode:: D2I64 - Double to 64-bit Int
+
+.. math::
+
+ dst.xy = (int64_t) src0.xy
+ dst.zw = (int64_t) src0.zw
+
+.. opcode:: U642F - 64-bit unsigned integer to float
+
+.. math::
+
+ dst.x = (float) src0.xy
+ dst.y = (float) src0.zw
+
+.. opcode:: I642F - 64-bit Int to Float
+
+.. math::
+
+ dst.x = (float) src0.xy
+ dst.y = (float) src0.zw
+
+.. opcode:: U642D - 64-bit unsigned integer to double
+
+.. math::
+
+ dst.xy = (double) src0.xy
+ dst.zw = (double) src0.zw
+
+.. opcode:: I642D - 64-bit Int to double
+
+.. math::
+
+ dst.xy = (double) src0.xy
+ dst.zw = (double) src0.zw
.. _samplingopcodes:
Note that the swizzle on SVIEW (src1) determines texel swizzling
after lookup.
-.. opcode:: SAMPLE - Using provided address, sample data from the
- specified texture using the filtering mode identified
- by the gven sampler. The source data may come from
- any resource type other than buffers.
- SAMPLE dst, address, sampler_view, sampler
- e.g.
- SAMPLE TEMP[0], TEMP[1], SVIEW[0], SAMP[0]
-
-.. opcode:: SAMPLE_I - Simplified alternative to the SAMPLE instruction.
- Using the provided integer address, SAMPLE_I fetches data
- from the specified sampler view without any filtering.
- The source data may come from any resource type other
- than CUBE.
- SAMPLE_I dst, address, sampler_view
- e.g.
- SAMPLE_I TEMP[0], TEMP[1], SVIEW[0]
- The 'address' is specified as unsigned integers. If the
- 'address' is out of range [0...(# texels - 1)] the
- result of the fetch is always 0 in all components.
- As such the instruction doesn't honor address wrap
- modes, in cases where that behavior is desirable
- 'SAMPLE' instruction should be used.
- address.w always provides an unsigned integer mipmap
- level. If the value is out of the range then the
- instruction always returns 0 in all components.
- address.yz are ignored for buffers and 1d textures.
- address.z is ignored for 1d texture arrays and 2d
- textures.
- For 1D texture arrays address.y provides the array
- index (also as unsigned integer). If the value is
- out of the range of available array indices
- [0... (array size - 1)] then the opcode always returns
- 0 in all components.
- For 2D texture arrays address.z provides the array
- index, otherwise it exhibits the same behavior as in
- the case for 1D texture arrays.
- The exact semantics of the source address are presented
- in the table below:
- resource type X Y Z W
- ------------- ------------------------
- PIPE_BUFFER x ignored
- PIPE_TEXTURE_1D x mpl
- PIPE_TEXTURE_2D x y mpl
- PIPE_TEXTURE_3D x y z mpl
- PIPE_TEXTURE_RECT x y mpl
- PIPE_TEXTURE_CUBE not allowed as source
- PIPE_TEXTURE_1D_ARRAY x idx mpl
- PIPE_TEXTURE_2D_ARRAY x y idx mpl
-
- Where 'mpl' is a mipmap level and 'idx' is the
- array index.
-
-.. opcode:: SAMPLE_I_MS - Just like SAMPLE_I but allows fetch data from
- multi-sampled surfaces.
- SAMPLE_I_MS dst, address, sampler_view, sample
-
-.. opcode:: SAMPLE_B - Just like the SAMPLE instruction with the
- exception that an additional bias is applied to the
- level of detail computed as part of the instruction
- execution.
- SAMPLE_B dst, address, sampler_view, sampler, lod_bias
- e.g.
- SAMPLE_B TEMP[0], TEMP[1], SVIEW[0], SAMP[0], TEMP[2].x
-
-.. opcode:: SAMPLE_C - Similar to the SAMPLE instruction but it
- performs a comparison filter. The operands to SAMPLE_C
- are identical to SAMPLE, except that there is an additional
- float32 operand, reference value, which must be a register
- with single-component, or a scalar literal.
- SAMPLE_C makes the hardware use the current samplers
- compare_func (in pipe_sampler_state) to compare
- reference value against the red component value for the
- surce resource at each texel that the currently configured
- texture filter covers based on the provided coordinates.
- SAMPLE_C dst, address, sampler_view.r, sampler, ref_value
- e.g.
- SAMPLE_C TEMP[0], TEMP[1], SVIEW[0].r, SAMP[0], TEMP[2].x
-
-.. opcode:: SAMPLE_C_LZ - Same as SAMPLE_C, but LOD is 0 and derivatives
- are ignored. The LZ stands for level-zero.
- SAMPLE_C_LZ dst, address, sampler_view.r, sampler, ref_value
- e.g.
- SAMPLE_C_LZ TEMP[0], TEMP[1], SVIEW[0].r, SAMP[0], TEMP[2].x
-
-
-.. opcode:: SAMPLE_D - SAMPLE_D is identical to the SAMPLE opcode except
- that the derivatives for the source address in the x
- direction and the y direction are provided by extra
- parameters.
- SAMPLE_D dst, address, sampler_view, sampler, der_x, der_y
- e.g.
- SAMPLE_D TEMP[0], TEMP[1], SVIEW[0], SAMP[0], TEMP[2], TEMP[3]
-
-.. opcode:: SAMPLE_L - SAMPLE_L is identical to the SAMPLE opcode except
- that the LOD is provided directly as a scalar value,
- representing no anisotropy.
- SAMPLE_L dst, address, sampler_view, sampler, explicit_lod
- e.g.
- SAMPLE_L TEMP[0], TEMP[1], SVIEW[0], SAMP[0], TEMP[2].x
-
-.. opcode:: GATHER4 - Gathers the four texels to be used in a bi-linear
- filtering operation and packs them into a single register.
- Only works with 2D, 2D array, cubemaps, and cubemaps arrays.
- For 2D textures, only the addressing modes of the sampler and
- the top level of any mip pyramid are used. Set W to zero.
- It behaves like the SAMPLE instruction, but a filtered
- sample is not generated. The four samples that contribute
- to filtering are placed into xyzw in counter-clockwise order,
- starting with the (u,v) texture coordinate delta at the
- following locations (-, +), (+, +), (+, -), (-, -), where
- the magnitude of the deltas are half a texel.
-
-
-.. opcode:: SVIEWINFO - query the dimensions of a given sampler view.
- dst receives width, height, depth or array size and
- number of mipmap levels as int4. The dst can have a writemask
- which will specify what info is the caller interested
- in.
- SVIEWINFO dst, src_mip_level, sampler_view
- e.g.
- SVIEWINFO TEMP[0], TEMP[1].x, SVIEW[0]
- src_mip_level is an unsigned integer scalar. If it's
- out of range then returns 0 for width, height and
- depth/array size but the total number of mipmap is
- still returned correctly for the given sampler view.
- The returned width, height and depth values are for
- the mipmap level selected by the src_mip_level and
- are in the number of texels.
- For 1d texture array width is in dst.x, array size
- is in dst.y and dst.z is 0. The number of mipmaps
- is still in dst.w.
- In contrast to d3d10 resinfo, there's no way in the
- tgsi instruction encoding to specify the return type
- (float/rcpfloat/uint), hence always using uint. Also,
- unlike the SAMPLE instructions, the swizzle on src1
- resinfo allowing swizzling dst values is ignored (due
- to the interaction with rcpfloat modifier which requires
- some swizzle handling in the state tracker anyway).
-
-.. opcode:: SAMPLE_POS - query the position of a given sample.
- dst receives float4 (x, y, 0, 0) indicated where the
- sample is located. If the resource is not a multi-sample
- resource and not a render target, the result is 0.
-
-.. opcode:: SAMPLE_INFO - dst receives number of samples in x.
- If the resource is not a multi-sample resource and
- not a render target, the result is 0.
+.. opcode:: SAMPLE
+
+ Using provided address, sample data from the specified texture using the
+ filtering mode identified by the given sampler. The source data may come from
+ any resource type other than buffers.
+
+ Syntax: ``SAMPLE dst, address, sampler_view, sampler``
+
+ Example: ``SAMPLE TEMP[0], TEMP[1], SVIEW[0], SAMP[0]``
+
+.. opcode:: SAMPLE_I
+
+ Simplified alternative to the SAMPLE instruction. Using the provided
+ integer address, SAMPLE_I fetches data from the specified sampler view
+ without any filtering. The source data may come from any resource type
+ other than CUBE.
+
+ Syntax: ``SAMPLE_I dst, address, sampler_view``
+
+ Example: ``SAMPLE_I TEMP[0], TEMP[1], SVIEW[0]``
+
+ The 'address' is specified as unsigned integers. If the 'address' is out of
+ range [0...(# texels - 1)] the result of the fetch is always 0 in all
+ components. As such the instruction doesn't honor address wrap modes, in
+ cases where that behavior is desirable 'SAMPLE' instruction should be used.
+ address.w always provides an unsigned integer mipmap level. If the value is
+ out of the range then the instruction always returns 0 in all components.
+ address.yz are ignored for buffers and 1d textures. address.z is ignored
+ for 1d texture arrays and 2d textures.
+
+ For 1D texture arrays address.y provides the array index (also as unsigned
+ integer). If the value is out of the range of available array indices
+ [0... (array size - 1)] then the opcode always returns 0 in all components.
+ For 2D texture arrays address.z provides the array index, otherwise it
+ exhibits the same behavior as in the case for 1D texture arrays. The exact
+ semantics of the source address are presented in the table below:
+
+ +---------------------------+----+-----+-----+---------+
+ | resource type | X | Y | Z | W |
+ +===========================+====+=====+=====+=========+
+ | ``PIPE_BUFFER`` | x | | | ignored |
+ +---------------------------+----+-----+-----+---------+
+ | ``PIPE_TEXTURE_1D`` | x | | | mpl |
+ +---------------------------+----+-----+-----+---------+
+ | ``PIPE_TEXTURE_2D`` | x | y | | mpl |
+ +---------------------------+----+-----+-----+---------+
+ | ``PIPE_TEXTURE_3D`` | x | y | z | mpl |
+ +---------------------------+----+-----+-----+---------+
+ | ``PIPE_TEXTURE_RECT`` | x | y | | mpl |
+ +---------------------------+----+-----+-----+---------+
+ | ``PIPE_TEXTURE_CUBE`` | not allowed as source |
+ +---------------------------+----+-----+-----+---------+
+ | ``PIPE_TEXTURE_1D_ARRAY`` | x | idx | | mpl |
+ +---------------------------+----+-----+-----+---------+
+ | ``PIPE_TEXTURE_2D_ARRAY`` | x | y | idx | mpl |
+ +---------------------------+----+-----+-----+---------+
+
+ Where 'mpl' is a mipmap level and 'idx' is the array index.
+
+.. opcode:: SAMPLE_I_MS
+
+ Just like SAMPLE_I but allows fetch data from multi-sampled surfaces.
+
+ Syntax: ``SAMPLE_I_MS dst, address, sampler_view, sample``
+
+.. opcode:: SAMPLE_B
+
+ Just like the SAMPLE instruction with the exception that an additional bias
+ is applied to the level of detail computed as part of the instruction
+ execution.
+
+ Syntax: ``SAMPLE_B dst, address, sampler_view, sampler, lod_bias``
+
+ Example: ``SAMPLE_B TEMP[0], TEMP[1], SVIEW[0], SAMP[0], TEMP[2].x``
+
+.. opcode:: SAMPLE_C
+
+ Similar to the SAMPLE instruction but it performs a comparison filter. The
+ operands to SAMPLE_C are identical to SAMPLE, except that there is an
+ additional float32 operand, reference value, which must be a register with
+ single-component, or a scalar literal. SAMPLE_C makes the hardware use the
+ current samplers compare_func (in pipe_sampler_state) to compare reference
+ value against the red component value for the surce resource at each texel
+ that the currently configured texture filter covers based on the provided
+ coordinates.
+
+ Syntax: ``SAMPLE_C dst, address, sampler_view.r, sampler, ref_value``
+
+ Example: ``SAMPLE_C TEMP[0], TEMP[1], SVIEW[0].r, SAMP[0], TEMP[2].x``
+
+.. opcode:: SAMPLE_C_LZ
+
+ Same as SAMPLE_C, but LOD is 0 and derivatives are ignored. The LZ stands
+ for level-zero.
+
+ Syntax: ``SAMPLE_C_LZ dst, address, sampler_view.r, sampler, ref_value``
+
+ Example: ``SAMPLE_C_LZ TEMP[0], TEMP[1], SVIEW[0].r, SAMP[0], TEMP[2].x``
+
+
+.. opcode:: SAMPLE_D
+
+ SAMPLE_D is identical to the SAMPLE opcode except that the derivatives for
+ the source address in the x direction and the y direction are provided by
+ extra parameters.
+
+ Syntax: ``SAMPLE_D dst, address, sampler_view, sampler, der_x, der_y``
+
+ Example: ``SAMPLE_D TEMP[0], TEMP[1], SVIEW[0], SAMP[0], TEMP[2], TEMP[3]``
+
+.. opcode:: SAMPLE_L
+
+ SAMPLE_L is identical to the SAMPLE opcode except that the LOD is provided
+ directly as a scalar value, representing no anisotropy.
+
+ Syntax: ``SAMPLE_L dst, address, sampler_view, sampler, explicit_lod``
+
+ Example: ``SAMPLE_L TEMP[0], TEMP[1], SVIEW[0], SAMP[0], TEMP[2].x``
+
+.. opcode:: GATHER4
+
+ Gathers the four texels to be used in a bi-linear filtering operation and
+ packs them into a single register. Only works with 2D, 2D array, cubemaps,
+ and cubemaps arrays. For 2D textures, only the addressing modes of the
+ sampler and the top level of any mip pyramid are used. Set W to zero. It
+ behaves like the SAMPLE instruction, but a filtered sample is not
+ generated. The four samples that contribute to filtering are placed into
+ xyzw in counter-clockwise order, starting with the (u,v) texture coordinate
+ delta at the following locations (-, +), (+, +), (+, -), (-, -), where the
+ magnitude of the deltas are half a texel.
+
+
+.. opcode:: SVIEWINFO
+
+ Query the dimensions of a given sampler view. dst receives width, height,
+ depth or array size and number of mipmap levels as int4. The dst can have a
+ writemask which will specify what info is the caller interested in.
+
+ Syntax: ``SVIEWINFO dst, src_mip_level, sampler_view``
+
+ Example: ``SVIEWINFO TEMP[0], TEMP[1].x, SVIEW[0]``
+
+ src_mip_level is an unsigned integer scalar. If it's out of range then
+ returns 0 for width, height and depth/array size but the total number of
+ mipmap is still returned correctly for the given sampler view. The returned
+ width, height and depth values are for the mipmap level selected by the
+ src_mip_level and are in the number of texels. For 1d texture array width
+ is in dst.x, array size is in dst.y and dst.z is 0. The number of mipmaps is
+ still in dst.w. In contrast to d3d10 resinfo, there's no way in the tgsi
+ instruction encoding to specify the return type (float/rcpfloat/uint), hence
+ always using uint. Also, unlike the SAMPLE instructions, the swizzle on src1
+ resinfo allowing swizzling dst values is ignored (due to the interaction
+ with rcpfloat modifier which requires some swizzle handling in the state
+ tracker anyway).
+
+.. opcode:: SAMPLE_POS
+
+ Query the position of a given sample. dst receives float4 (x, y, 0, 0)
+ indicated where the sample is located. If the resource is not a multi-sample
+ resource and not a render target, the result is 0.
+
+.. opcode:: SAMPLE_INFO
+
+ dst receives number of samples in x. If the resource is not a multi-sample
+ resource and not a render target, the result is 0.
.. _resourceopcodes:
Resource Access Opcodes
^^^^^^^^^^^^^^^^^^^^^^^
-.. opcode:: LOAD - Fetch data from a shader resource
+.. opcode:: LOAD - Fetch data from a shader buffer or image
Syntax: ``LOAD dst, resource, address``
- Example: ``LOAD TEMP[0], RES[0], TEMP[1]``
+ Example: ``LOAD TEMP[0], BUFFER[0], TEMP[1]``
Using the provided integer address, LOAD fetches data
from the specified buffer or texture without any
texture arrays and 2D textures. address.w is always
ignored.
+ A swizzle suffix may be added to the resource argument
+ this will cause the resource data to be swizzled accordingly.
+
.. opcode:: STORE - Write data to a shader resource
Syntax: ``STORE resource, address, src``
- Example: ``STORE RES[0], TEMP[0], TEMP[1]``
+ Example: ``STORE BUFFER[0], TEMP[0], TEMP[1]``
Using the provided integer address, STORE writes data
to the specified buffer or texture.
texture arrays and 2D textures. address.w is always
ignored.
+.. opcode:: RESQ - Query information about a resource
+
+ Syntax: ``RESQ dst, resource``
+
+ Example: ``RESQ TEMP[0], BUFFER[0]``
+
+ Returns information about the buffer or image resource. For buffer
+ resources, the size (in bytes) is returned in the x component. For
+ image resources, .xyz will contain the width/height/layers of the
+ image, while .w will contain the number of samples for multi-sampled
+ images.
+
+.. opcode:: FBFETCH - Load data from framebuffer
+
+ Syntax: ``FBFETCH dst, output``
+
+ Example: ``FBFETCH TEMP[0], OUT[0]``
+
+ This is only valid on ``COLOR`` semantic outputs. Returns the color
+ of the current position in the framebuffer from before this fragment
+ shader invocation. May return the same value from multiple calls for
+ a particular output within a single invocation. Note that result may
+ be undefined if a fragment is drawn multiple times without a blend
+ barrier in between.
+
.. _threadsyncopcodes:
the program. Results are unspecified if any of the remaining
threads terminates or never reaches an executed BARRIER instruction.
+.. opcode:: MEMBAR - Memory barrier
+
+ ``MEMBAR type``
+
+ This opcode waits for the completion of all memory accesses based on
+ the type passed in. The type is an immediate bitfield with the following
+ meaning:
+
+ Bit 0: Shader storage buffers
+ Bit 1: Atomic buffers
+ Bit 2: Images
+ Bit 3: Shared memory
+ Bit 4: Thread group
+
+ These may be passed in in any combination. An implementation is free to not
+ distinguish between these as it sees fit. However these map to all the
+ possibilities made available by GLSL.
.. _atomopcodes:
logical operations. In this context atomicity means that another
concurrent memory access operation that affects the same memory
location is guaranteed to be performed strictly before or after the
-entire execution of the atomic operation.
-
-For the moment they're only valid in compute programs.
+entire execution of the atomic operation. The resource may be a buffer
+or an image. In the case of an image, the offset works the same as for
+``LOAD`` and ``STORE``, specified above. These atomic operations may
+only be used with 32-bit integer image formats.
.. opcode:: ATOMUADD - Atomic integer addition
Syntax: ``ATOMUADD dst, resource, offset, src``
- Example: ``ATOMUADD TEMP[0], RES[0], TEMP[1], TEMP[2]``
+ Example: ``ATOMUADD TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
- The following operation is performed atomically on each component:
+ The following operation is performed atomically:
.. math::
- dst_i = resource[offset]_i
+ dst_x = resource[offset]
- resource[offset]_i = dst_i + src_i
+ resource[offset] = dst_x + src_x
.. opcode:: ATOMXCHG - Atomic exchange
Syntax: ``ATOMXCHG dst, resource, offset, src``
- Example: ``ATOMXCHG TEMP[0], RES[0], TEMP[1], TEMP[2]``
+ Example: ``ATOMXCHG TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
- The following operation is performed atomically on each component:
+ The following operation is performed atomically:
.. math::
- dst_i = resource[offset]_i
+ dst_x = resource[offset]
- resource[offset]_i = src_i
+ resource[offset] = src_x
.. opcode:: ATOMCAS - Atomic compare-and-exchange
Syntax: ``ATOMCAS dst, resource, offset, cmp, src``
- Example: ``ATOMCAS TEMP[0], RES[0], TEMP[1], TEMP[2], TEMP[3]``
+ Example: ``ATOMCAS TEMP[0], BUFFER[0], TEMP[1], TEMP[2], TEMP[3]``
- The following operation is performed atomically on each component:
+ The following operation is performed atomically:
.. math::
- dst_i = resource[offset]_i
+ dst_x = resource[offset]
- resource[offset]_i = (dst_i == cmp_i ? src_i : dst_i)
+ resource[offset] = (dst_x == cmp_x ? src_x : dst_x)
.. opcode:: ATOMAND - Atomic bitwise And
Syntax: ``ATOMAND dst, resource, offset, src``
- Example: ``ATOMAND TEMP[0], RES[0], TEMP[1], TEMP[2]``
+ Example: ``ATOMAND TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
- The following operation is performed atomically on each component:
+ The following operation is performed atomically:
.. math::
- dst_i = resource[offset]_i
+ dst_x = resource[offset]
- resource[offset]_i = dst_i \& src_i
+ resource[offset] = dst_x \& src_x
.. opcode:: ATOMOR - Atomic bitwise Or
Syntax: ``ATOMOR dst, resource, offset, src``
- Example: ``ATOMOR TEMP[0], RES[0], TEMP[1], TEMP[2]``
+ Example: ``ATOMOR TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
- The following operation is performed atomically on each component:
+ The following operation is performed atomically:
.. math::
- dst_i = resource[offset]_i
+ dst_x = resource[offset]
- resource[offset]_i = dst_i | src_i
+ resource[offset] = dst_x | src_x
.. opcode:: ATOMXOR - Atomic bitwise Xor
Syntax: ``ATOMXOR dst, resource, offset, src``
- Example: ``ATOMXOR TEMP[0], RES[0], TEMP[1], TEMP[2]``
+ Example: ``ATOMXOR TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
- The following operation is performed atomically on each component:
+ The following operation is performed atomically:
.. math::
- dst_i = resource[offset]_i
+ dst_x = resource[offset]
- resource[offset]_i = dst_i \oplus src_i
+ resource[offset] = dst_x \oplus src_x
.. opcode:: ATOMUMIN - Atomic unsigned minimum
Syntax: ``ATOMUMIN dst, resource, offset, src``
- Example: ``ATOMUMIN TEMP[0], RES[0], TEMP[1], TEMP[2]``
+ Example: ``ATOMUMIN TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
- The following operation is performed atomically on each component:
+ The following operation is performed atomically:
.. math::
- dst_i = resource[offset]_i
+ dst_x = resource[offset]
- resource[offset]_i = (dst_i < src_i ? dst_i : src_i)
+ resource[offset] = (dst_x < src_x ? dst_x : src_x)
.. opcode:: ATOMUMAX - Atomic unsigned maximum
Syntax: ``ATOMUMAX dst, resource, offset, src``
- Example: ``ATOMUMAX TEMP[0], RES[0], TEMP[1], TEMP[2]``
+ Example: ``ATOMUMAX TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
- The following operation is performed atomically on each component:
+ The following operation is performed atomically:
.. math::
- dst_i = resource[offset]_i
+ dst_x = resource[offset]
- resource[offset]_i = (dst_i > src_i ? dst_i : src_i)
+ resource[offset] = (dst_x > src_x ? dst_x : src_x)
.. opcode:: ATOMIMIN - Atomic signed minimum
Syntax: ``ATOMIMIN dst, resource, offset, src``
- Example: ``ATOMIMIN TEMP[0], RES[0], TEMP[1], TEMP[2]``
+ Example: ``ATOMIMIN TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
- The following operation is performed atomically on each component:
+ The following operation is performed atomically:
.. math::
- dst_i = resource[offset]_i
+ dst_x = resource[offset]
- resource[offset]_i = (dst_i < src_i ? dst_i : src_i)
+ resource[offset] = (dst_x < src_x ? dst_x : src_x)
.. opcode:: ATOMIMAX - Atomic signed maximum
Syntax: ``ATOMIMAX dst, resource, offset, src``
- Example: ``ATOMIMAX TEMP[0], RES[0], TEMP[1], TEMP[2]``
+ Example: ``ATOMIMAX TEMP[0], BUFFER[0], TEMP[1], TEMP[2]``
- The following operation is performed atomically on each component:
+ The following operation is performed atomically:
.. math::
- dst_i = resource[offset]_i
+ dst_x = resource[offset]
+
+ resource[offset] = (dst_x > src_x ? dst_x : src_x)
+
- resource[offset]_i = (dst_i > src_i ? dst_i : src_i)
+.. _voteopcodes:
+Vote opcodes
+^^^^^^^^^^^^
+
+These opcodes compare the given value across the shader invocations
+running in the current SIMD group. The details of exactly which
+invocations get compared are implementation-defined, and it would be a
+correct implementation to only ever consider the current thread's
+value. (i.e. SIMD group of 1). The argument is treated as a boolean.
+
+.. opcode:: VOTE_ANY - Value is set in any of the current invocations
+
+.. opcode:: VOTE_ALL - Value is set in all of the current invocations
+
+.. opcode:: VOTE_EQ - Value is the same in all of the current invocations
Explanation of symbols used
^^^^^^^^^^^^^^^^^^^^^^^^
Declarations can optional have an ArrayID attribute which can be referred by
-indirect addressing operands. An ArrayID of zero is reserved and treaded as
+indirect addressing operands. An ArrayID of zero is reserved and treated as
if no ArrayID is specified.
If an indirect addressing operand refers to a specific declaration by using
If no ArrayID is specified with an indirect addressing operand the whole
register file might be accessed by this operand. This is strongly discouraged
and will prevent packing of scalar/vec2 arrays and effective alias analysis.
+This is only legal for TEMP and CONST register files.
Declaration Semantic
^^^^^^^^^^^^^^^^^^^^^^^^
- Vertex and fragment shader input and output registers may be labeled
- with semantic information consisting of a name and index.
+Vertex and fragment shader input and output registers may be labeled
+with semantic information consisting of a name and index.
- Follows Declaration token if Semantic bit is set.
+Follows Declaration token if Semantic bit is set.
- Since its purpose is to link a shader with other stages of the pipeline,
- it is valid to follow only those Declaration tokens that declare a register
- either in INPUT or OUTPUT file.
+Since its purpose is to link a shader with other stages of the pipeline,
+it is valid to follow only those Declaration tokens that declare a register
+either in INPUT or OUTPUT file.
- SemanticName field contains the semantic name of the register being declared.
- There is no default value.
+SemanticName field contains the semantic name of the register being declared.
+There is no default value.
- SemanticIndex is an optional subscript that can be used to distinguish
- different register declarations with the same semantic name. The default value
- is 0.
+SemanticIndex is an optional subscript that can be used to distinguish
+different register declarations with the same semantic name. The default value
+is 0.
- The meanings of the individual semantic names are explained in the following
- sections.
+The meanings of the individual semantic names are explained in the following
+sections.
TGSI_SEMANTIC_POSITION
""""""""""""""""""""""
vertex will be divided by the W value to get normalized device coordinates.
For fragment shaders, TGSI_SEMANTIC_POSITION is used to indicate that
-fragment shader input contains the fragment's window position. The X
+fragment shader input (or system value, depending on which one is
+supported by the driver) contains the fragment's window position. The X
component starts at zero and always increases from left to right.
The Y component starts at zero and always increases but Y=0 may either
indicate the top of the window or the bottom depending on the fragment
coordinate origin convention (see TGSI_PROPERTY_FS_COORD_ORIGIN).
The Z coordinate ranges from 0 to 1 to represent depth from the front
-to the back of the Z buffer. The W component contains the reciprocol
-of the interpolated vertex position W component.
+to the back of the Z buffer. The W component contains the interpolated
+reciprocal of the vertex position W component (corresponding to gl_Fragcoord,
+but unlike d3d10 which interpolates the same 1/w but then gives back
+the reciprocal of the interpolated value).
Fragment shaders may also declare an output register with
TGSI_SEMANTIC_POSITION. Only the Z component is writable. This allows
"""""""""""""""""""
For vertex shader outputs or fragment shader inputs/outputs, this
-label indicates that the resister contains an R,G,B,A color.
+label indicates that the register contains an R,G,B,A color.
Several shader inputs/outputs may contain colors so the semantic index
is used to distinguish them. For example, color[0] may be the diffuse
Vertex shader inputs and outputs and fragment shader inputs may be
labeled with TGSI_SEMANTIC_FOG to indicate that the register contains
-a fog coordinate in the form (F, 0, 0, 1). Typically, the fragment
-shader will use the fog coordinate to compute a fog blend factor which
-is used to blend the normal fragment color with a constant fog color.
-
-Only the first component matters when writing from the vertex shader;
-the driver will ensure that the coordinate is in this format when used
-as a fragment shader input.
+a fog coordinate. Typically, the fragment shader will use the fog coordinate
+to compute a fog blend factor which is used to blend the normal fragment color
+with a constant fog color. But fog coord really is just an ordinary vec4
+register like regular semantics.
TGSI_SEMANTIC_PSIZE
TGSI_SEMANTIC_FACE
""""""""""""""""""
-This label applies to fragment shader inputs only and indicates that
-the register contains front/back-face information of the form (F, 0,
-0, 1). The first component will be positive when the fragment belongs
-to a front-facing polygon, and negative when the fragment belongs to a
-back-facing polygon.
+This label applies to fragment shader inputs (or system values,
+depending on which one is supported by the driver) and indicates that
+the register contains front/back-face information.
+
+If it is an input, it will be a floating-point vector in the form (F, 0, 0, 1),
+where F will be positive when the fragment belongs to a front-facing polygon,
+and negative when the fragment belongs to a back-facing polygon.
+
+If it is a system value, it will be an integer vector in the form (F, 0, 0, 1),
+where F is 0xffffffff when the fragment belongs to a front-facing polygon and
+0 when the fragment belongs to a back-facing polygon.
TGSI_SEMANTIC_EDGEFLAG
For geometry shaders, this semantic label indicates that an output
contains the index of the viewport (and scissor) to use.
-Only the X value is used.
+This is an integer value, and only the X component is used.
TGSI_SEMANTIC_LAYER
For geometry shaders, this semantic label indicates that an output
contains the layer value to use for the color and depth/stencil surfaces.
-Only the X value is used. (Also known as rendertarget array index.)
+This is an integer value, and only the X component is used.
+(Also known as rendertarget array index.)
TGSI_SEMANTIC_CULLDIST
TGSI_SEMANTIC_CLIPDIST
""""""""""""""""""""""
+Note this covers clipping and culling distances.
+
When components of vertex elements are identified this way, these
values are each assumed to be a float32 signed distance to a plane.
+
+For clip distances:
Primitive setup only invokes rasterization on pixels for which
-the interpolated plane distances are >= 0. Multiple clip planes
-can be implemented simultaneously, by annotating multiple
-components of one or more vertex elements with the above specified
-semantic. The limits on both clip and cull distances are bound
+the interpolated plane distances are >= 0.
+
+For cull distances:
+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);
+
+Multiple clip/cull planes can be implemented simultaneously, by
+annotating multiple components of one or more vertex elements with
+the above specified semantic.
+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.
+The properties NUM_CLIPDIST_ENABLED and NUM_CULLDIST_ENABLED
+are used to divide up the 2 x vec4 space between clipping and culling.
+
+TGSI_SEMANTIC_SAMPLEID
+""""""""""""""""""""""
+
+For fragment shaders, this semantic label indicates that a system value
+contains the current sample id (i.e. gl_SampleID).
+This is an integer value, and only the X component is used.
+
+TGSI_SEMANTIC_SAMPLEPOS
+"""""""""""""""""""""""
+
+For fragment shaders, this semantic label indicates that a system value
+contains the current sample's position (i.e. gl_SamplePosition). Only the X
+and Y values are used.
+
+TGSI_SEMANTIC_SAMPLEMASK
+""""""""""""""""""""""""
+
+For fragment shaders, this semantic label indicates that an output contains
+the sample mask used to disable further sample processing
+(i.e. gl_SampleMask). Only the X value is used, up to 32x MS.
+
+TGSI_SEMANTIC_INVOCATIONID
+""""""""""""""""""""""""""
+
+For geometry shaders, this semantic label indicates that a system value
+contains the current invocation id (i.e. gl_InvocationID).
+This is an integer value, and only the X component is used.
+
+TGSI_SEMANTIC_INSTANCEID
+""""""""""""""""""""""""
+
+For vertex shaders, this semantic label indicates that a system value contains
+the current instance id (i.e. gl_InstanceID). It does not include the base
+instance. This is an integer value, and only the X component is used.
+
+TGSI_SEMANTIC_VERTEXID
+""""""""""""""""""""""
+
+For vertex shaders, this semantic label indicates that a system value contains
+the current vertex id (i.e. gl_VertexID). It does (unlike in d3d10) include the
+base vertex. This is an integer value, and only the X component is used.
+
+TGSI_SEMANTIC_VERTEXID_NOBASE
+"""""""""""""""""""""""""""""""
+
+For vertex shaders, this semantic label indicates that a system value contains
+the current vertex id without including the base vertex (this corresponds to
+d3d10 vertex id, so TGSI_SEMANTIC_VERTEXID_NOBASE + TGSI_SEMANTIC_BASEVERTEX
+== TGSI_SEMANTIC_VERTEXID). This is an integer value, and only the X component
+is used.
+
+TGSI_SEMANTIC_BASEVERTEX
+""""""""""""""""""""""""
+
+For vertex shaders, this semantic label indicates that a system value contains
+the base vertex (i.e. gl_BaseVertex). Note that for non-indexed draw calls,
+this contains the first (or start) value instead.
+This is an integer value, and only the X component is used.
+
+TGSI_SEMANTIC_PRIMID
+""""""""""""""""""""
+
+For geometry and fragment shaders, this semantic label indicates the value
+contains the primitive id (i.e. gl_PrimitiveID). This is an integer value,
+and only the X component is used.
+FIXME: This right now can be either a ordinary input or a system value...
+
+
+TGSI_SEMANTIC_PATCH
+"""""""""""""""""""
+
+For tessellation evaluation/control shaders, this semantic label indicates a
+generic per-patch attribute. Such semantics will not implicitly be per-vertex
+arrays.
+
+TGSI_SEMANTIC_TESSCOORD
+"""""""""""""""""""""""
+
+For tessellation evaluation shaders, this semantic label indicates the
+coordinates of the vertex being processed. This is available in XYZ; W is
+undefined.
+
+TGSI_SEMANTIC_TESSOUTER
+"""""""""""""""""""""""
+
+For tessellation evaluation/control shaders, this semantic label indicates the
+outer tessellation levels of the patch. Isoline tessellation will only have XY
+defined, triangle will have XYZ and quads will have XYZW defined. This
+corresponds to gl_TessLevelOuter.
+
+TGSI_SEMANTIC_TESSINNER
+"""""""""""""""""""""""
+
+For tessellation evaluation/control shaders, this semantic label indicates the
+inner tessellation levels of the patch. The X value is only defined for
+triangle tessellation, while quads will have XY defined. This is entirely
+undefined for isoline tessellation.
+
+TGSI_SEMANTIC_VERTICESIN
+""""""""""""""""""""""""
+
+For tessellation evaluation/control shaders, this semantic label indicates the
+number of vertices provided in the input patch. Only the X value is defined.
+
+TGSI_SEMANTIC_HELPER_INVOCATION
+"""""""""""""""""""""""""""""""
+
+For fragment shaders, this semantic indicates whether the current
+invocation is covered or not. Helper invocations are created in order
+to properly compute derivatives, however it may be desirable to skip
+some of the logic in those cases. See ``gl_HelperInvocation`` documentation.
+
+TGSI_SEMANTIC_BASEINSTANCE
+""""""""""""""""""""""""""
+
+For vertex shaders, the base instance argument supplied for this
+draw. This is an integer value, and only the X component is used.
+
+TGSI_SEMANTIC_DRAWID
+""""""""""""""""""""
+
+For vertex shaders, the zero-based index of the current draw in a
+``glMultiDraw*`` invocation. This is an integer value, and only the X
+component is used.
+
+
+TGSI_SEMANTIC_WORK_DIM
+""""""""""""""""""""""
+
+For compute shaders started via opencl this retrieves the work_dim
+parameter to the clEnqueueNDRangeKernel call with which the shader
+was started.
+
+
+TGSI_SEMANTIC_GRID_SIZE
+"""""""""""""""""""""""
+
+For compute shaders, this semantic indicates the maximum (x, y, z) dimensions
+of a grid of thread blocks.
+
+
+TGSI_SEMANTIC_BLOCK_ID
+""""""""""""""""""""""
+
+For compute shaders, this semantic indicates the (x, y, z) coordinates of the
+current block inside of the grid.
+
+
+TGSI_SEMANTIC_BLOCK_SIZE
+""""""""""""""""""""""""
+
+For compute shaders, this semantic indicates the maximum (x, y, z) dimensions
+of a block in threads.
+
+
+TGSI_SEMANTIC_THREAD_ID
+"""""""""""""""""""""""
+
+For compute shaders, this semantic indicates the (x, y, z) coordinates of the
+current thread inside of the block.
Declaration Interpolate
The Interpolate field specifes the way input is being interpolated by
the rasteriser and is one of TGSI_INTERPOLATE_*.
+The Location field specifies the location inside the pixel that the
+interpolation should be done at, one of ``TGSI_INTERPOLATE_LOC_*``. Note that
+when per-sample shading is enabled, the implementation may choose to
+interpolate at the sample irrespective of the Location field.
+
The CylindricalWrap bitfield specifies which register components
should be subject to cylindrical wrapping when interpolating by the
rasteriser. If TGSI_CYLINDRICAL_WRAP_X is set to 1, the X component
Declaration Sampler View
^^^^^^^^^^^^^^^^^^^^^^^^
- Follows Declaration token if file is TGSI_FILE_SAMPLER_VIEW.
+Follows Declaration token if file is TGSI_FILE_SAMPLER_VIEW.
+
+DCL SVIEW[#], resource, type(s)
- DCL SVIEW[#], resource, type(s)
+Declares a shader input sampler view and assigns it to a SVIEW[#]
+register.
- Declares a shader input sampler view and assigns it to a SVIEW[#]
- register.
+resource can be one of BUFFER, 1D, 2D, 3D, 1DArray and 2DArray.
- resource can be one of BUFFER, 1D, 2D, 3D, 1DArray and 2DArray.
+type must be 1 or 4 entries (if specifying on a per-component
+level) out of UNORM, SNORM, SINT, UINT and FLOAT.
- type must be 1 or 4 entries (if specifying on a per-component
- level) out of UNORM, SNORM, SINT, UINT and FLOAT.
+For TEX\* style texture sample opcodes (as opposed to SAMPLE\* opcodes
+which take an explicit SVIEW[#] source register), there may be optionally
+SVIEW[#] declarations. In this case, the SVIEW index is implied by the
+SAMP index, and there must be a corresponding SVIEW[#] declaration for
+each SAMP[#] declaration. Drivers are free to ignore this if they wish.
+But note in particular that some drivers need to know the sampler type
+(float/int/unsigned) in order to generate the correct code, so cases
+where integer textures are sampled, SVIEW[#] declarations should be
+used.
+NOTE: It is NOT legal to mix SAMPLE\* style opcodes and TEX\* opcodes
+in the same shader.
Declaration Resource
^^^^^^^^^^^^^^^^^^^^
- Follows Declaration token if file is TGSI_FILE_RESOURCE.
+Follows Declaration token if file is TGSI_FILE_RESOURCE.
- DCL RES[#], resource [, WR] [, RAW]
+DCL RES[#], resource [, WR] [, RAW]
- Declares a shader input resource and assigns it to a RES[#]
- register.
+Declares a shader input resource and assigns it to a RES[#]
+register.
- resource can be one of BUFFER, 1D, 2D, 3D, CUBE, 1DArray and
- 2DArray.
+resource can be one of BUFFER, 1D, 2D, 3D, CUBE, 1DArray and
+2DArray.
- If the RAW keyword is not specified, the texture data will be
- subject to conversion, swizzling and scaling as required to yield
- the specified data type from the physical data format of the bound
- resource.
+If the RAW keyword is not specified, the texture data will be
+subject to conversion, swizzling and scaling as required to yield
+the specified data type from the physical data format of the bound
+resource.
- If the RAW keyword is specified, no channel conversion will be
- performed: the values read for each of the channels (X,Y,Z,W) will
- correspond to consecutive words in the same order and format
- they're found in memory. No element-to-address conversion will be
- performed either: the value of the provided X coordinate will be
- interpreted in byte units instead of texel units. The result of
- accessing a misaligned address is undefined.
+If the RAW keyword is specified, no channel conversion will be
+performed: the values read for each of the channels (X,Y,Z,W) will
+correspond to consecutive words in the same order and format
+they're found in memory. No element-to-address conversion will be
+performed either: the value of the provided X coordinate will be
+interpreted in byte units instead of texel units. The result of
+accessing a misaligned address is undefined.
- Usage of the STORE opcode is only allowed if the WR (writable) flag
- is set.
+Usage of the STORE opcode is only allowed if the WR (writable) flag
+is set.
Properties
^^^^^^^^^^^^^^^^^^^^^^^^
-
- Properties are general directives that apply to the whole TGSI program.
+Properties are general directives that apply to the whole TGSI program.
FS_COORD_ORIGIN
"""""""""""""""
This is useful for APIs that don't have UCPs and where clip distances written
by a shader cannot be disabled.
+GS_INVOCATIONS
+""""""""""""""
+
+Specifies the number of times a geometry shader should be executed for each
+input primitive. Each invocation will have a different
+TGSI_SEMANTIC_INVOCATIONID system value set. If not specified, assumed to
+be 1.
+
+VS_WINDOW_SPACE_POSITION
+""""""""""""""""""""""""""
+If this property is set on the vertex shader, the TGSI_SEMANTIC_POSITION output
+is assumed to contain window space coordinates.
+Division of X,Y,Z by W and the viewport transformation are disabled, and 1/W is
+directly taken from the 4-th component of the shader output.
+Naturally, clipping is not performed on window coordinates either.
+The effect of this property is undefined if a geometry or tessellation shader
+are in use.
+
+TCS_VERTICES_OUT
+""""""""""""""""
+
+The number of vertices written by the tessellation control shader. This
+effectively defines the patch input size of the tessellation evaluation shader
+as well.
+
+TES_PRIM_MODE
+"""""""""""""
+
+This sets the tessellation primitive mode, one of ``PIPE_PRIM_TRIANGLES``,
+``PIPE_PRIM_QUADS``, or ``PIPE_PRIM_LINES``. (Unlike in GL, there is no
+separate isolines settings, the regular lines is assumed to mean isolines.)
+
+TES_SPACING
+"""""""""""
+
+This sets the spacing mode of the tessellation generator, one of
+``PIPE_TESS_SPACING_*``.
+
+TES_VERTEX_ORDER_CW
+"""""""""""""""""""
+
+This sets the vertex order to be clockwise if the value is 1, or
+counter-clockwise if set to 0.
+
+TES_POINT_MODE
+""""""""""""""
+
+If set to a non-zero value, this turns on point mode for the tessellator,
+which means that points will be generated instead of primitives.
+
+NUM_CLIPDIST_ENABLED
+""""""""""""""""
+
+How many clip distance scalar outputs are enabled.
+
+NUM_CULLDIST_ENABLED
+""""""""""""""""
+
+How many cull distance scalar outputs are enabled.
+
+FS_EARLY_DEPTH_STENCIL
+""""""""""""""""""""""
+
+Whether depth test, stencil test, and occlusion query should run before
+the fragment shader (regardless of fragment shader side effects). Corresponds
+to GLSL early_fragment_tests.
+
+NEXT_SHADER
+"""""""""""
+
+Which shader stage will MOST LIKELY follow after this shader when the shader
+is bound. This is only a hint to the driver and doesn't have to be precise.
+Only set for VS and TES.
+
+CS_FIXED_BLOCK_WIDTH / HEIGHT / DEPTH
+"""""""""""""""""""""""""""""""""""""
+
+Threads per block in each dimension, if known at compile time. If the block size
+is known all three should be at least 1. If it is unknown they should all be set
+to 0 or not set.
+
+MUL_ZERO_WINS
+"""""""""""""
+
+The MUL TGSI operation (FP32 multiplication) will return 0 if either
+of the operands are equal to 0. That means that 0 * Inf = 0. This
+should be set the same way for an entire pipeline. Note that this
+applies not only to the literal MUL TGSI opcode, but all FP32
+multiplications implied by other operations, such as MAD, FMA, DP2,
+DP3, DP4, DPH, DST, LOG, LRP, XPD, and possibly others. If there is a
+mismatch between shaders, then it is unspecified whether this behavior
+will be enabled.
+
Texture Sampling and Texture Formats
------------------------------------
projects / mesa.git / blobdiff