void BiquadLowShelf::SetupFast ( Float32 normFreq, Float32 dB, Float32 shelfSlope ){
Float32 A = pow( 10, dB/40 );
Float32 w0 = 2 * M_PI * normFreq;
Float32 sn, cs;
fastsincos( w0, &sn, &cs );
Float32 al = sn / 2 * fastsqrt1( (A + 1/A) * (1/shelfSlope - 1) + 2 );
Float32 sa = 2 * fastsqrt1( A ) * al;
SetupCommon( cs, A, sa );
}
bool TestSinCos() {
for (int i = -100; i <= 100; i++) {
float f = i / 30.0f;
// The PSP sin/cos take as argument angle * M_PI_2.
// We need to match that.
float slowsin = sinf(f * M_PI_2), slowcos = cosf(f * M_PI_2);
float fastsin, fastcos;
fastsincos(f, fastsin, fastcos);
printf("%f: slow: %0.8f, %0.8f fast: %0.8f, %0.8f\n", f, slowsin, slowcos, fastsin, fastcos);
}
return true;
}
