sgn - vs

Computes the sign of the input.

Syntax

where

• dst is the destination register.
• src0 is a source register.
• src1 is a temporary register that holds intermediate results. Following execution, contents are undefined.
• src2 is a temporary register that holds intermediate results. Following execution, contents are undefined.

Remarks

This instruction works as shown below.

for each component in src0
{
   if (src0.component < 0) 
       dest.component = -1; 
   else
       if (src0.component == 0) 
           dest.component = 0; 
       else 
           dest.component = 1;
}

src1 and src2 must be different Temporary Registers.

Related topics

Vertex Shader Instructions