call (Vertex Shader)

Performs a function call to the instruction marked with the provided label index.

Syntax

where label is a label number.

Remarks

Vertex shader versions	1_1	2_0	2_x	2_sw	3_0	3_sw
call		x	x	x	x	x

This instruction does the following:

1. Push address of the next instruction to the return address stack.
2. Continue execution from the instruction marked by the label.

In vertex shader 2_0, nesting calls are not allowed.

In vertex shader 2_x, the nesting depth is limited by the StaticFlowControlDepth element of the D3DVSHADERCAPS2_0 structure. For more information, see IDirect3D9::GetDeviceCaps.

In vertex shader 3_0, four levels of call nesting are allowed.

Only forward calls are allowed. This means that the location of the label inside the vertex shader should be after the call instruction referencing it.

If a call instruction is invoked inside loop...endloop block, the value of the Loop Counter Register (aL) is accessible inside the subroutine.

If a subroutine is referencing the Loop Counter Register (aL) located outside of the subroutine, every instance of the call to this subroutine should be surrounded by a loop...endloop block.