| ?/TD> |
| Microsoft DirectX 9.0 |
Starts an if...else...endif block.
| if boolRegister |
|---|
where boolRegister is a bool register number. See Constant Boolean Register.
| Vertex shader versions | 1_1 | 2_0 | 2_x | 2_sw | 3_0 | 3_sw |
|---|---|---|---|---|---|---|
| if | x | x | x | x | x |
If the source Boolean register in the if statement is true, the code enclosed by the if statement and the matching else is run. Otherwise, the code enclosed by the else...endif statements is run. This instruction consumes one instruction slot.
if blocks can be nested.
An if block cannot straddle a loop block.
This instruction provides conditional static flow control.
defb b2, TRUE if b3 // Instructions to run if b3 is nonzero else // Instructions to run otherwise endif
| Minimum operating system | Windows 98 |
|---|