/* * PlayStation Reverberation Algorithm (C)Dr.Hell, 2005 * 厳密には、左右の処理のタイミングは1サンプリング時間ずれており、 * 各々は2サンプリング時間毎に実行される */ mAPF1 = *((ushort *) 0x1F801DC0) * 4; mAPF2 = *((ushort *) 0x1F801DC2) * 4; gIIR = *((short *) 0x1F801DC4) / 32768.0; gCOMB1 = *((short *) 0x1F801DC6) / 32768.0; gCOMB2 = *((short *) 0x1F801DC8) / 32768.0; gCOMB3 = *((short *) 0x1F801DCA) / 32768.0; gCOMB4 = *((short *) 0x1F801DCC) / 32768.0; gWALL = *((short *) 0x1F801DCE) / 32768.0; gAPF1 = *((short *) 0x1F801DD0) / 32768.0; gAPF2 = *((short *) 0x1F801DD2) / 32768.0; z0_Lsame = *((ushort *) 0x1F801DD4) * 4; z0_Rsame = *((ushort *) 0x1F801DD6) * 4; m1_Lcomb = *((ushort *) 0x1F801DD8) * 4; m1_Rcomb = *((ushort *) 0x1F801DDA) * 4; m2_Lcomb = *((ushort *) 0x1F801DDC) * 4; m2_Rcomb = *((ushort *) 0x1F801DDE) * 4; zm_Lsame = *((ushort *) 0x1F801DE0) * 4; zm_Rsame = *((ushort *) 0x1F801DE2) * 4; z0_Ldiff = *((ushort *) 0x1F801DE4) * 4; z0_Rdiff = *((ushort *) 0x1F801DE6) * 4; m3_Lcomb = *((ushort *) 0x1F801DE8) * 4; m3_Rcomb = *((ushort *) 0x1F801DEA) * 4; m4_Lcomb = *((ushort *) 0x1F801DEC) * 4; m4_Rcomb = *((ushort *) 0x1F801DEE) * 4; zm_Ldiff = *((ushort *) 0x1F801DF0) * 4; zm_Rdiff = *((ushort *) 0x1F801DF2) * 4; z0_Lapf1 = *((ushort *) 0x1F801DF4) * 4; z0_Rapf1 = *((ushort *) 0x1F801DF6) * 4; z0_Lapf2 = *((ushort *) 0x1F801DF8) * 4; z0_Rapf2 = *((ushort *) 0x1F801DFA) * 4; gLIN = *((short *) 0x1F801DFC) / 32768.0; gRIN = *((short *) 0x1F801DFE) / 32768.0; z1_Lsame = z0_Lsame - 1; z1_Rsame = z0_Rsame - 1; z1_Ldiff = z0_Ldiff - 1; z1_Rdiff = z0_Rdiff - 1; zm_Lapf1 = z0_Lapf1 - mAPF1; zm_Rapf1 = z0_Rapf1 - mAPF1; zm_Lapf2 = z0_Lapf2 - mAPF2; zm_Rapf2 = z0_Rapf2 - mAPF2; for (;;) { /* * LoadFromLowPassFilterは35もしくは39タップのFIRフィルタ * 最外周の係数が0でも結果は同じなので、35か39かは特定できず */ L_in = gLIN * LoadFromLowPassFilterL(); R_in = gRIN * LoadFromLowPassFilterR(); /* * Left -> Wall -> Left Reflection */ L_temp = ReadReverbWork(zm_Lsame); R_temp = ReadReverbWork(zm_Rsame); L_same = L_in + gWALL * L_temp; R_same = R_in + gWALL * R_temp; L_temp = ReadReverbWork(z1_Lsame); R_temp = ReadReverbWork(z1_Rsame); L_same = L_temp + gIIR * (L_same - L_temp); R_same = R_temp + gIIR * (R_same - R_temp); /* * Left -> Wall -> Right Reflection */ L_temp = ReadReverbWork(zm_Rdiff); R_temp = ReadReverbWork(zm_Ldiff); L_diff = L_in + gWALL * L_temp; R_diff = R_in + gWALL * R_temp; L_temp = ReadReverbWork(z1_Ldiff); R_temp = ReadReverbWork(z1_Rdiff); L_diff = L_temp + gIIR * (L_diff - L_temp); R_diff = R_temp + gIIR * (R_diff - R_temp); /* * Early Echo(Comb Filter) */ L_in = gCOMB1 * ReadReverbWork(m1_Lcomb) + gCOMB2 *ReadReverbWork(m2_Lcomb) + gCOMB3 *ReadReverbWork(m3_Lcomb) + gCOMB4 *ReadReverbWork(m4_Lcomb); R_in = gCOMB1 * ReadReverbWork(m1_Rcomb) + gCOMB2 *ReadReverbWork(m2_Rcomb) + gCOMB3 *ReadReverbWork(m3_Rcomb) + gCOMB4 *ReadReverbWork(m4_Rcomb); /* * Late Reverb(Two All Pass Filters) */ L_temp = ReadReverbWork(zm_Lapf1); R_temp = ReadReverbWork(zm_Rapf1); L_apf1 = L_in - gAPF1 * L_temp; R_apf1 = R_in - gAPF1 * R_temp; L_in = L_temp + gAPF1 * L_apf1; R_in = R_temp + gAPF1 * R_apf1; L_temp = ReadReverbWork(zm_Lapf2); R_temp = ReadReverbWork(zm_Rapf2); L_apf2 = L_in - gAPF2 * L_temp; R_apf2 = R_in - gAPF2 * R_temp; L_in = L_temp + gAPF2 * L_apf2; R_in = R_temp + gAPF2 * R_apf2; /* * Output */ SetOutputL(L_in); SetOutputR(R_in); /* * Write Buffer */ WriteReverbWork(z0_Lsame, L_same); WriteReverbWork(z0_Rsame, R_same); WriteReverbWork(z0_Ldiff, L_diff); WriteReverbWork(z0_Rdiff, R_diff); WriteReverbWork(z0_Lapf1, L_apf1); WriteReverbWork(z0_Rapf1, R_apf1); WriteReverbWork(z0_Lapf2, L_apf2); WriteReverbWork(z0_Rapf2, R_apf2); /* * Update Circular Buffer */ UpdateReverbWork(); }