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Starts an if...else...endif - vs block.
| if bool |
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where bool 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 bool | 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 - vs 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 b2 // Instructions to run if b2 is nonzero else // Instructions to run otherwise endif