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This vertex shader output register contains per-vertex position data.
| Vertex shader versions | 1_1 | 2_0 | 2_sw | 2_x | 3_0 | 3_sw |
|---|---|---|---|---|---|---|
| Position Register | x | 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