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if bool - vs

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Starts an if...else...endif - vs block.

Syntax

if bool

 

where bool is a bool register number. See Constant Boolean Register.

Remarks

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.

Example

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

Vertex Shader Instructions

else - vs

endif - vs