TGSI¶

TGSI, Tungsten Graphics Shader Instructions, is an intermediate language for describing shaders. Since Gallium is inherently shaderful, shaders are an important part of the API. TGSI is the only intermediate representation used by all drivers.

From GL_NV_vertex_program¶

ARL - Address Register Load

$dst.x = \lfloor src.x\rfloor dst.y = \lfloor src.y\rfloor dst.z = \lfloor src.z\rfloor dst.w = \lfloor src.w\rfloor$

MOV - Move

$dst.x = src.x dst.y = src.y dst.z = src.z dst.w = src.w$

LIT - Light Coefficients

$dst.x = 1 dst.y = max(src.x, 0) dst.z = (src.x > 0) ? max(src.y, 0)^{clamp(src.w, -128, 128))} : 0 dst.w = 1$

RCP - Reciprocal

$dst.x = \frac{1}{src.x} dst.y = \frac{1}{src.x} dst.z = \frac{1}{src.x} dst.w = \frac{1}{src.x}$

RSQ - Reciprocal Square Root

$dst.x = \frac{1}{\sqrt{|src.x|}} dst.y = \frac{1}{\sqrt{|src.x|}} dst.z = \frac{1}{\sqrt{|src.x|}} dst.w = \frac{1}{\sqrt{|src.x|}}$

EXP - Approximate Exponential Base 2

$dst.x = 2^{\lfloor src.x\rfloor} dst.y = src.x - \lfloor src.x\rfloor dst.z = 2^{src.x} dst.w = 1$

LOG - Approximate Logarithm Base 2

$dst.x = \lfloor\log_2{|src.x|}\rfloor dst.y = \frac{|src.x|}{2^{\lfloor\log_2{|src.x|}\rfloor}} dst.z = \log_2{|src.x|} dst.w = 1$

MUL - Multiply

$dst.x = src0.x \times src1.x dst.y = src0.y \times src1.y dst.z = src0.z \times src1.z dst.w = src0.w \times src1.w$

ADD - Add

$dst.x = src0.x + src1.x dst.y = src0.y + src1.y dst.z = src0.z + src1.z dst.w = src0.w + src1.w$

DP3 - 3-component Dot Product

$dst.x = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z dst.y = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z dst.z = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z dst.w = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z$

DP4 - 4-component Dot Product

$dst.x = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z + src0.w \times src1.w dst.y = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z + src0.w \times src1.w dst.z = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z + src0.w \times src1.w dst.w = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z + src0.w \times src1.w$

DST - Distance Vector

$dst.x = 1 dst.y = src0.y \times src1.y dst.z = src0.z dst.w = src1.w$

MIN - Minimum

$dst.x = min(src0.x, src1.x) dst.y = min(src0.y, src1.y) dst.z = min(src0.z, src1.z) dst.w = min(src0.w, src1.w)$

MAX - Maximum

$dst.x = max(src0.x, src1.x) dst.y = max(src0.y, src1.y) dst.z = max(src0.z, src1.z) dst.w = max(src0.w, src1.w)$

SLT - Set On Less Than

$dst.x = (src0.x < src1.x) ? 1 : 0 dst.y = (src0.y < src1.y) ? 1 : 0 dst.z = (src0.z < src1.z) ? 1 : 0 dst.w = (src0.w < src1.w) ? 1 : 0$

SGE - Set On Greater Equal Than

$dst.x = (src0.x >= src1.x) ? 1 : 0 dst.y = (src0.y >= src1.y) ? 1 : 0 dst.z = (src0.z >= src1.z) ? 1 : 0 dst.w = (src0.w >= src1.w) ? 1 : 0$

MAD - Multiply And Add

$dst.x = src0.x \times src1.x + src2.x dst.y = src0.y \times src1.y + src2.y dst.z = src0.z \times src1.z + src2.z dst.w = src0.w \times src1.w + src2.w$

SUB - Subtract

$dst.x = src0.x - src1.x dst.y = src0.y - src1.y dst.z = src0.z - src1.z dst.w = src0.w - src1.w$

LRP - Linear Interpolate

$dst.x = src0.x \times (src1.x - src2.x) + src2.x dst.y = src0.y \times (src1.y - src2.y) + src2.y dst.z = src0.z \times (src1.z - src2.z) + src2.z dst.w = src0.w \times (src1.w - src2.w) + src2.w$

CND - Condition

$dst.x = (src2.x > 0.5) ? src0.x : src1.x dst.y = (src2.y > 0.5) ? src0.y : src1.y dst.z = (src2.z > 0.5) ? src0.z : src1.z dst.w = (src2.w > 0.5) ? src0.w : src1.w$

DP2A - 2-component Dot Product And Add

$dst.x = src0.x \times src1.x + src0.y \times src1.y + src2.x dst.y = src0.x \times src1.x + src0.y \times src1.y + src2.x dst.z = src0.x \times src1.x + src0.y \times src1.y + src2.x dst.w = src0.x \times src1.x + src0.y \times src1.y + src2.x$

FRAC - Fraction

$dst.x = src.x - \lfloor src.x\rfloor dst.y = src.y - \lfloor src.y\rfloor dst.z = src.z - \lfloor src.z\rfloor dst.w = src.w - \lfloor src.w\rfloor$

CLAMP - Clamp

$dst.x = clamp(src0.x, src1.x, src2.x) dst.y = clamp(src0.y, src1.y, src2.y) dst.z = clamp(src0.z, src1.z, src2.z) dst.w = clamp(src0.w, src1.w, src2.w)$

FLR - Floor

This is identical to ARL.

$dst.x = \lfloor src.x\rfloor dst.y = \lfloor src.y\rfloor dst.z = \lfloor src.z\rfloor dst.w = \lfloor src.w\rfloor$

ROUND - Round

$dst.x = round(src.x) dst.y = round(src.y) dst.z = round(src.z) dst.w = round(src.w)$

EX2 - Exponential Base 2

$dst.x = 2^{src.x} dst.y = 2^{src.x} dst.z = 2^{src.x} dst.w = 2^{src.x}$

LG2 - Logarithm Base 2

$dst.x = \log_2{src.x} dst.y = \log_2{src.x} dst.z = \log_2{src.x} dst.w = \log_2{src.x}$

POW - Power

$dst.x = src0.x^{src1.x} dst.y = src0.x^{src1.x} dst.z = src0.x^{src1.x} dst.w = src0.x^{src1.x}$

XPD - Cross Product

$dst.x = src0.y \times src1.z - src1.y \times src0.z dst.y = src0.z \times src1.x - src1.z \times src0.x dst.z = src0.x \times src1.y - src1.x \times src0.y dst.w = 1$

ABS - Absolute

RCC - Reciprocal Clamped

XXX cleanup on aisle three

$dst.x = (1 / src.x) > 0 ? clamp(1 / src.x, 5.42101e-020, 1.884467e+019) : clamp(1 / src.x, -1.884467e+019, -5.42101e-020) dst.y = (1 / src.x) > 0 ? clamp(1 / src.x, 5.42101e-020, 1.884467e+019) : clamp(1 / src.x, -1.884467e+019, -5.42101e-020) dst.z = (1 / src.x) > 0 ? clamp(1 / src.x, 5.42101e-020, 1.884467e+019) : clamp(1 / src.x, -1.884467e+019, -5.42101e-020) dst.w = (1 / src.x) > 0 ? clamp(1 / src.x, 5.42101e-020, 1.884467e+019) : clamp(1 / src.x, -1.884467e+019, -5.42101e-020)$

DPH - Homogeneous Dot Product

$dst.x = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z + src1.w dst.y = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z + src1.w dst.z = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z + src1.w dst.w = src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z + src1.w$

COS - Cosine

$dst.x = \cos{src.x} dst.y = \cos{src.x} dst.z = \cos{src.x} dst.w = \cos{src.w}$

DDX - Derivative Relative To X

$dst.x = partialx(src.x) dst.y = partialx(src.y) dst.z = partialx(src.z) dst.w = partialx(src.w)$

DDY - Derivative Relative To Y

$dst.x = partialy(src.x) dst.y = partialy(src.y) dst.z = partialy(src.z) dst.w = partialy(src.w)$

KILP - Predicated Discard

PK2H - Pack Two 16-bit Floats

PK2US - Pack Two Unsigned 16-bit Scalars

PK4B - Pack Four Signed 8-bit Scalars

PK4UB - Pack Four Unsigned 8-bit Scalars

RFL - Reflection Vector

$dst.x = 2 \times (src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z) / (src0.x \times src0.x + src0.y \times src0.y + src0.z \times src0.z) \times src0.x - src1.x dst.y = 2 \times (src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z) / (src0.x \times src0.x + src0.y \times src0.y + src0.z \times src0.z) \times src0.y - src1.y dst.z = 2 \times (src0.x \times src1.x + src0.y \times src1.y + src0.z \times src1.z) / (src0.x \times src0.x + src0.y \times src0.y + src0.z \times src0.z) \times src0.z - src1.z dst.w = 1$

Considered for removal.

SEQ - Set On Equal

$dst.x = (src0.x == src1.x) ? 1 : 0 dst.y = (src0.y == src1.y) ? 1 : 0 dst.z = (src0.z == src1.z) ? 1 : 0 dst.w = (src0.w == src1.w) ? 1 : 0$

SFL - Set On False

$dst.x = 0 dst.y = 0 dst.z = 0 dst.w = 0$

Considered for removal.

SGT - Set On Greater Than

$dst.x = (src0.x > src1.x) ? 1 : 0 dst.y = (src0.y > src1.y) ? 1 : 0 dst.z = (src0.z > src1.z) ? 1 : 0 dst.w = (src0.w > src1.w) ? 1 : 0$

SIN - Sine

$dst.x = \sin{src.x} dst.y = \sin{src.x} dst.z = \sin{src.x} dst.w = \sin{src.w}$

SLE - Set On Less Equal Than

$dst.x = (src0.x <= src1.x) ? 1 : 0 dst.y = (src0.y <= src1.y) ? 1 : 0 dst.z = (src0.z <= src1.z) ? 1 : 0 dst.w = (src0.w <= src1.w) ? 1 : 0$

SNE - Set On Not Equal

$dst.x = (src0.x != src1.x) ? 1 : 0 dst.y = (src0.y != src1.y) ? 1 : 0 dst.z = (src0.z != src1.z) ? 1 : 0 dst.w = (src0.w != src1.w) ? 1 : 0$

STR - Set On True

$dst.x = 1 dst.y = 1 dst.z = 1 dst.w = 1$

TEX - Texture Lookup

TXD - Texture Lookup with Derivatives

TXP - Projective Texture Lookup

UP2H - Unpack Two 16-Bit Floats

UP2US - Unpack Two Unsigned 16-Bit Scalars

UP4B - Unpack Four Signed 8-Bit Values

UP4UB - Unpack Four Unsigned 8-Bit Scalars

X2D - 2D Coordinate Transformation

$dst.x = src0.x + src1.x \times src2.x + src1.y \times src2.y dst.y = src0.y + src1.x \times src2.z + src1.y \times src2.w dst.z = src0.x + src1.x \times src2.x + src1.y \times src2.y dst.w = src0.y + src1.x \times src2.z + src1.y \times src2.w$

Considered for removal.

GL_NV_vertex_program2¶

ARA - Address Register Add

ARR - Address Register Load With Round

$dst.x = round(src.x) dst.y = round(src.y) dst.z = round(src.z) dst.w = round(src.w)$

BRA - Branch

CAL - Subroutine Call

RET - Subroutine Call Return

SSG - Set Sign

$dst.x = (src.x > 0) ? 1 : (src.x < 0) ? -1 : 0 dst.y = (src.y > 0) ? 1 : (src.y < 0) ? -1 : 0 dst.z = (src.z > 0) ? 1 : (src.z < 0) ? -1 : 0 dst.w = (src.w > 0) ? 1 : (src.w < 0) ? -1 : 0$

CMP - Compare

$dst.x = (src0.x < 0) ? src1.x : src2.x dst.y = (src0.y < 0) ? src1.y : src2.y dst.z = (src0.z < 0) ? src1.z : src2.z dst.w = (src0.w < 0) ? src1.w : src2.w$

KIL - Conditional Discard

$if (src.x < 0 || src.y < 0 || src.z < 0 || src.w < 0) discard endif$

SCS - Sine Cosine

$dst.x = \cos{src.x} dst.y = \sin{src.x} dst.z = 0 dst.y = 1$

TXB - Texture Lookup With Bias

NRM - 3-component Vector Normalise

$dst.x = src.x / (src.x \times src.x + src.y \times src.y + src.z \times src.z) dst.y = src.y / (src.x \times src.x + src.y \times src.y + src.z \times src.z) dst.z = src.z / (src.x \times src.x + src.y \times src.y + src.z \times src.z) dst.w = 1$

DIV - Divide

$dst.x = \frac{src0.x}{src1.x} dst.y = \frac{src0.y}{src1.y} dst.z = \frac{src0.z}{src1.z} dst.w = \frac{src0.w}{src1.w}$

DP2 - 2-component Dot Product

$dst.x = src0.x \times src1.x + src0.y \times src1.y dst.y = src0.x \times src1.x + src0.y \times src1.y dst.z = src0.x \times src1.x + src0.y \times src1.y dst.w = src0.x \times src1.x + src0.y \times src1.y$

TXL - Texture Lookup With LOD

BRK - Break

IF - If

BGNFOR - Begin a For-Loop

REP - Repeat

ELSE - Else

ENDIF - End If

ENDFOR - End a For-Loop

ENDREP - End Repeat

PUSHA - Push Address Register On Stack

POPA - Pop Address Register From Stack

GL_NV_gpu_program4¶

Support for these opcodes indicated by a special pipe capability bit (TBD).

CEIL - Ceiling

$dst.x = \lceil src.x\rceil dst.y = \lceil src.y\rceil dst.z = \lceil src.z\rceil dst.w = \lceil src.w\rceil$

I2F - Integer To Float

$dst.x = (float) src.x dst.y = (float) src.y dst.z = (float) src.z dst.w = (float) src.w$

NOT - Bitwise Not

$dst.x = ~src.x dst.y = ~src.y dst.z = ~src.z dst.w = ~src.w$

TRUNC - Truncate

XXX how is this different from floor?

$dst.x = trunc(src.x) dst.y = trunc(src.y) dst.z = trunc(src.z) dst.w = trunc(src.w)$

SHL - Shift Left

$dst.x = src0.x << src1.x dst.y = src0.y << src1.x dst.z = src0.z << src1.x dst.w = src0.w << src1.x$

SHR - Shift Right

$dst.x = src0.x >> src1.x dst.y = src0.y >> src1.x dst.z = src0.z >> src1.x dst.w = src0.w >> src1.x$

AND - Bitwise And

$dst.x = src0.x & src1.x dst.y = src0.y & src1.y dst.z = src0.z & src1.z dst.w = src0.w & src1.w$

OR - Bitwise Or

$dst.x = src0.x | src1.x dst.y = src0.y | src1.y dst.z = src0.z | src1.z dst.w = src0.w | src1.w$

MOD - Modulus

$dst.x = src0.x \bmod src1.x dst.y = src0.y \bmod src1.y dst.z = src0.z \bmod src1.z dst.w = src0.w \bmod src1.w$

XOR - Bitwise Xor

$dst.x = src0.x ^ src1.x dst.y = src0.y ^ src1.y dst.z = src0.z ^ src1.z dst.w = src0.w ^ src1.w$

SAD - Sum Of Absolute Differences

TXF - Texel Fetch

TXQ - Texture Size Query

CONT - Continue

GL_NV_geometry_program4¶

EMIT - Emit

ENDPRIM - End Primitive

GLSL¶

BGNLOOP - Begin a Loop

BGNSUB - Begin Subroutine

ENDLOOP - End a Loop

ENDSUB - End Subroutine

NOP - No Operation

NRM4 - 4-component Vector Normalise

$dst.x = \frac{src.x}{src.x \times src.x + src.y \times src.y + src.z \times src.z + src.w \times src.w} dst.y = \frac{src.y}{src.x \times src.x + src.y \times src.y + src.z \times src.z + src.w \times src.w} dst.z = \frac{src.z}{src.x \times src.x + src.y \times src.y + src.z \times src.z + src.w \times src.w} dst.w = \frac{src.w}{src.x \times src.x + src.y \times src.y + src.z \times src.z + src.w \times src.w}$

ps_2_x¶

CALLNZ - Subroutine Call If Not Zero

IFC - If

BREAKC - Break Conditional

Explanation of symbols used¶

Functions¶

Keywords¶

Other tokens¶

Declaration Semantic¶

FACE¶

TGSI¶

From GL_NV_vertex_program¶

GL_NV_vertex_program2¶

GL_NV_gpu_program4¶

GL_NV_geometry_program4¶

GLSL¶

ps_2_x¶

Explanation of symbols used¶

Functions¶

Keywords¶

Other tokens¶

Declaration Semantic¶

FACE¶

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TGSI¶

From GL_NV_vertex_program¶

GL_NV_vertex_program2¶

GL_NV_gpu_program4¶

GL_NV_geometry_program4¶

GLSL¶

ps_2_x¶

Explanation of symbols used¶

Functions¶

Keywords¶

Other tokens¶

Declaration Semantic¶

FACE¶

Table Of Contents

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