Instructions - vs_2_0

This section contains reference information for the vertex shader version 2_0 instructions.

There are several types of vertex shader instructions, as shown in the table. Columns to the right mean the following:

Instruction slots - Number of instruction slots used by each instruction.
Setup - Non-arithmetic instructions. Every shader must have a version instruction and it must be the first instruction.
Arithmetic - These instructions provide the mathematical operations in a shader.
Flow control - These instructions add flow control capabilities such as loop...endloop, if...else...endif - vs, and subroutine calls.
New - These instructions are new to this version.

Instruction Set

Name	Description	Instruction slots	Setup	Arithmetic	Flow control	New
abs - vs	Absolute value	1		x		x
add - vs	Add two vectors	1		x
call - vs	Call a subroutine	2			x	x
callnz bool - vs	Call a subroutine if a Boolean register is not zero	3			x	x
crs - vs	Cross product	2		x		x
dcl_usage input register - vs	Declare input vertex registers (see Registers - vs_2_0)	0	x
def - vs	Define constants	0	x
defb - vs	Define a Boolean constant	0	x			x
defi - vs	Define an integer constant	0	x			x
dp3 - vs	Three-component dot product	1		x
dp4 - vs	Four-component dot product	1		x
dst - vs	Calculate the distance vector	1		x
else - vs	Begin an else - vs block	1			x	x
endif - vs	End an if bool - vs...else - vs block	1			x	x
endloop - vs	End of a loop - vs block	2			x	x
endrep - vs	End of a repeat block	2			x	x
exp - vs	Full precision 2^x	1		x
exp - vs	Partial precision 2^x	1		x
frc - vs	Fractional component	1		x
if bool - vs	Begin an if bool - vs block (using a Boolean condition)	3			x	x
label - vs	Label	0			x	x
lit - vs	Partial lighting calculation	3		x
log - vs	Full precision log₂(x)	1		x
logp - vs	Partial precision log₂(x)	1		x
loop - vs	Loop	3			x	x
lrp - vs	Linear interpolation	2		x		x
m3x2 - vs	3x2 multiply	2		x
m3x3 - vs	3x3 multiply	3		x
m3x4 - vs	3x4 multiply	4		x
m4x3 - vs	4x3 multiply	3		x
m4x4 - vs	4x4 multiply	4		x
mad - vs	Multiply and add	1		x
max - vs	Maximum	1		x
min - vs	Minimum	1		x
mov - vs	Move	1		x
mova - vs	Move data from a floating-point register to the address register (a0)	1		x		x
mul - vs	Multiply	1		x
nop - vs	No operation	1		x
nrm - vs	Normalize a 4D vector	3		x		x
pow - vs	x^y	3		x		x
rcp - vs	Reciprocal	1		x
rep - vs	Repeat	3			x	x
ret - vs	End of either a subroutine or main	1			x	x
rsq - vs	Reciprocal square root	1		x
sge - vs	Greater than or equal compare	1		x
sgn - vs	Sign	3		x		x
sincos - vs	Sine and cosine	8		x		x
slt - vs	Less than compare	1		x
sub - vs	Subtract	1		x
vs	Version	0	x