static void init_timetables( FM_OPL *OPL , int ARRATE , int DRRATE ) { int i; double rate; /* make attack rate & decay rate tables */ for (i = 0;i < 4;i++) OPL->AR_TABLE[i] = OPL->DR_TABLE[i] = 0; for (i = 4;i <= 60;i++){ rate = OPL->freqbase; /* frequency rate */ if( i < 60 ) rate *= 1.0+(i&3)*0.25; /* b0-1 : x1 , x1.25 , x1.5 , x1.75 */ rate *= 1<<((i>>2)-1); /* b2-5 : shift bit */ rate *= (double)(EG_ENT<<ENV_BITS); OPL->AR_TABLE[i] = rate / ARRATE; OPL->DR_TABLE[i] = rate / DRRATE; } for (i = 60; i < ARRAY_SIZE(OPL->AR_TABLE); i++) { OPL->AR_TABLE[i] = EG_AED-1; OPL->DR_TABLE[i] = OPL->DR_TABLE[60]; } #if 0 for (i = 0;i < 64 ;i++){ /* make for overflow area */ LOG(LOG_WAR,("rate %2d , ar %f ms , dr %f ms \n",i, ((double)(EG_ENT<<ENV_BITS) / OPL->AR_TABLE[i]) * (1000.0 / OPL->rate), ((double)(EG_ENT<<ENV_BITS) / OPL->DR_TABLE[i]) * (1000.0 / OPL->rate) )); } #endif }