TIDM-HV-1PH-DCAC: Which principle of SPWM modulation is the following code based on?

Dear team:

In interrupt void inverterISR:

//
// Generate the RAMP angle
//
RAMPGEN_run(&rgen1);

//
// Use the angle value to compute the sine value
//
invSine = sinf((rgen1.out)*6.283185307f);

Which principle of SPWM modulation is the above code written based on?

is the sine value generated by unipolar symmetrical regular sampling? Bipolar SPWM wave?

B est regards