Instructions - vs_1_1

This section contains reference information for the vertex shader version 1_1 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.
Macro-ops - These instructions combine arithmetic instructions to provide higher level functionality. The use of macro-ops is optional. It is preferable to use macro-ops, especially the matrix multiply instructions (m3x2, m3x3, m3x4, m4x3, m4x4), because they provide optimization opportunities to the underlying implementation.
New - These instructions are new to this version.

Instruction Set

Name	Description	Instruction slots	Setup	Arithmetic	Macro-ops	New
add	Add two vectors	1		x		x
dcl_usage	Declare input vertex registers. See Registers - vs_1_1	0	x			x
def	Define constants	0	x			x
dp3	Three-component dot product	1		x		x
dp4	Three-component dot product	1		x		x
dst	Distance	1		x		x
exp	Full precision 2^x	10			x	x
expp	Partial precision 2^x	1			x	x
frc	Fractional component	3			x	x
lit	Calculate lighting	1		x		x
log	Full precision log₂(x)	10			x	x
logp	Partial precision log₂(x)	1			x	x
m3x2	3x2 matrix multiply	2			x	x
m3x3	3x3 matrix multiply	3			x	x
m3x4	3x4 matrix multiply	4			x	x
m4x3	4x3 matrix multiply	3			x	x
m4x4	4x4 matrix multiply	4			x	x
mad	Multiply and add	1		x		x
max	Maximum	1		x		x
min	Minimum	1		x		x
mov	Move	1		x		x
mul	Multiply	1		x		x
nop	No operation	0		x		x
rcp	Reciprocal	1		x		x
rsq	Reciprocal square root	1		x		x
sge	Greater than or equal compare	1		x		x
slt	Less than compare	1		x		x
sub	Subtract	1		x		x
vs	Version	0	x			x