Position Register

This vertex shader output register contains per-vertex position date.

Syntax

Position Register 

Remarks

Remarks

Vertex shader versions	1_1	2_0	2_sw	2_x	3_0	3_sw
Position Register		x	x	x	x	x

A register consists of properties that determine how each register behaves.

Property	Description
Name	oPos
Count	1 vector
I/O permissions	Write-only.

The value is the position in homogeneous clipping space. This value must be written by the vertex shader.

Example

dcl_position v0

def c40, 0.0f,0.0f,0.0f,0.0f;
// transform into projection space
m4x4 r0,v0,c8
max r0.z,c40.z,r0.z //clamp to 0
max r0.w,c12.x,r0.w //clamp to near clip plane
mov oPos,r0   

For a more complete code sample, see the VertexBlend software development kit (SDK) sample.

Instruction Information

Minimum operating system	Windows 98