public void NES_APU_np_SetRate(NES_APU chip, double r) { NES_APU apu = (NES_APU)chip; apu.rate = r != 0 ? r : DEFAULT_RATE; COUNTER_init(apu.tick_count, apu.clock, apu.rate); apu.tick_last = 0; }
public void NES_APU_np_SetOption(NES_APU chip, Int32 id, Int32 val) { NES_APU apu = (NES_APU)chip; if (id < (int)OPT.OPT_END) { apu.option[id] = val; } }
//static void sweep_sqr(NES_APU* apu, int ch); // calculates target sweep frequency //static INT32 calc_sqr(NES_APU* apu, int ch, UINT32 clocks); //static void Tick(NES_APU* apu, UINT32 clocks); private static void sweep_sqr(NES_APU apu, int i) { Int32 shifted = apu.freq[i] >> apu.sweep_amount[i]; if (i == 0 && apu.sweep_mode[i]) { shifted += 1; } apu.sfreq[i] = apu.freq[i] + (apu.sweep_mode[i] ? -shifted : shifted); //DEBUG_OUT("shifted[%d] = %d (%d >> %d)\n",i,shifted,apu->freq[i],apu->sweep_amount[i]); }
public void NES_APU_np_SetStereoMix(NES_APU chip, Int32 trk, Int16 mixl, Int16 mixr) { NES_APU apu = (NES_APU)chip; if (trk < 0) { return; } if (trk > 1) { return; } apu.sm[0][trk] = mixl; apu.sm[1][trk] = mixr; }
// 生成される波形の振幅は0-8191 public UInt32 NES_APU_np_Render(NES_APU chip, Int32[] b) //b[2]) { NES_APU apu = (NES_APU)chip; COUNTER_iup(apu.tick_count); Tick(apu, (COUNTER_value(apu.tick_count) - apu.tick_last) & 0xFF); apu.tick_last = COUNTER_value(apu.tick_count); apu._out[0] = (apu.mask & 1) != 0 ? 0 : apu._out[0]; apu._out[1] = (apu.mask & 2) != 0 ? 0 : apu._out[1]; if (apu.option[(int)OPT.OPT_NONLINEAR_MIXER] != 0) { Int32 voltage; Int32 _ref; voltage = apu.square_table[apu._out[0] + apu._out[1]]; m[0] = apu._out[0] << 6; m[1] = apu._out[1] << 6; _ref = m[0] + m[1]; if (_ref > 0) { m[0] = (m[0] * voltage) / _ref; m[1] = (m[1] * voltage) / _ref; } else { m[0] = voltage; m[1] = voltage; } } else { m[0] = apu._out[0] << 6; m[1] = apu._out[1] << 6; } // Shifting is (x-2) to match the volume of MAME's NES APU sound core b[0] = m[0] * apu.sm[0][0]; b[0] += m[1] * apu.sm[0][1]; b[0] >>= 5; // was 7, but is now 8 for bipolar square b[1] = m[0] * apu.sm[1][0]; b[1] += m[1] * apu.sm[1][1]; b[1] >>= 5; // see above return(2); }
public bool NES_APU_np_Read(NES_APU chip, UInt32 adr, ref UInt32 val) { NES_APU apu = (NES_APU)chip; if (0x4000 <= adr && adr < 0x4008) { val |= apu.reg[adr & 0x7]; return(true); } else if (adr == 0x4015) { val |= (uint)((apu.length_counter[1] != 0 ? 2 : 0) | (apu.length_counter[0] != 0 ? 1 : 0)); return(true); } else { return(false); } }
public void NES_APU_np_Reset(NES_APU chip) { NES_APU apu = (NES_APU)chip; Int32 i; apu.gclock = 0; apu.mask = 0; apu.scounter[0] = 0; apu.scounter[1] = 0; apu.sphase[0] = 0; apu.sphase[0] = 0; apu.sweep_div[0] = 1; apu.sweep_div[1] = 1; apu.envelope_div[0] = 0; apu.envelope_div[1] = 0; apu.length_counter[0] = 0; apu.length_counter[1] = 0; apu.envelope_counter[0] = 0; apu.envelope_counter[1] = 0; for (i = 0x4000; i < 0x4008; i++) { NES_APU_np_Write(apu, (UInt32)i, 0); } NES_APU_np_Write(apu, 0x4015, 0); if (apu.option[(int)OPT.OPT_UNMUTE_ON_RESET] != 0) { NES_APU_np_Write(apu, 0x4015, 0x0f); } for (i = 0; i < 2; i++) { apu._out[i] = 0; } NES_APU_np_SetRate(apu, apu.rate); }
private Int32 calc_sqr(NES_APU apu, Int32 i, UInt32 clocks) { Int32 ret = 0; apu.scounter[i] += (Int32)clocks; while (apu.scounter[i] > apu.freq[i]) { apu.sphase[i] = (apu.sphase[i] + 1) & 15; apu.scounter[i] -= (apu.freq[i] + 1); } //INT32 ret = 0; if (apu.length_counter[i] > 0 && apu.freq[i] >= 8 && apu.sfreq[i] < 0x800 ) { Int32 v = apu.envelope_disable[i] ? apu.volume[i] : apu.envelope_counter[i]; ret = sqrtbl[apu.duty[i]][apu.sphase[i]] != 0 ? v : 0; } return(ret); }
public NES_APU NES_APU_np_Create(Int32 clock, Int32 rate) { NES_APU apu; Int32 i, c, t; apu = new NES_APU();// malloc(sizeof(NES_APU)); if (apu == null) { return(null); } //memset(apu, 0x00, sizeof(NES_APU)); //NES_APU_np_SetClock(apu, DEFAULT_CLOCK); //NES_APU_np_SetRate(apu, DEFAULT_RATE); NES_APU_np_SetClock(apu, clock); NES_APU_np_SetRate(apu, rate); apu.option[(int)OPT.OPT_UNMUTE_ON_RESET] = 1; // true; apu.option[(int)OPT.OPT_PHASE_REFRESH] = 1; // true; apu.option[(int)OPT.OPT_NONLINEAR_MIXER] = 1; // true; apu.option[(int)OPT.OPT_DUTY_SWAP] = 0; // false; apu.square_table[0] = 0; for (i = 1; i < 32; i++) { apu.square_table[i] = (Int32)((8192.0 * 95.88) / (8128.0 / i + 100)); } for (c = 0; c < 2; ++c) { for (t = 0; t < 2; ++t) { apu.sm[c][t] = 128; } } return(apu); }
public bool NES_APU_np_Write(NES_APU chip, UInt32 adr, UInt32 val) { NES_APU apu = (NES_APU)chip; Int32 ch; if (0x4000 <= adr && adr < 0x4008) { //DEBUG_OUT("$%04X = %02X\n",adr,val); adr &= 0xf; ch = (Int32)(adr >> 2); switch (adr) { case 0x0: case 0x4: apu.volume[ch] = (Int32)(val & 15); apu.envelope_disable[ch] = ((val >> 4) & 1) != 0; apu.envelope_loop[ch] = ((val >> 5) & 1) != 0; apu.envelope_div_period[ch] = (Int32)(val & 15); apu.duty[ch] = (Int32)((val >> 6) & 3); if (apu.option[(int)OPT.OPT_DUTY_SWAP] != 0) { if (apu.duty[ch] == 1) { apu.duty[ch] = 2; } else if (apu.duty[ch] == 2) { apu.duty[ch] = 1; } } break; case 0x1: case 0x5: apu.sweep_enable[ch] = ((val >> 7) & 1) != 0; apu.sweep_div_period[ch] = (Int32)(((val >> 4) & 7)); apu.sweep_mode[ch] = ((val >> 3) & 1) != 0; apu.sweep_amount[ch] = (Int32)(val & 7); apu.sweep_write[ch] = true; sweep_sqr(apu, ch); break; case 0x2: case 0x6: apu.freq[ch] = (Int32)(val | (UInt32)(apu.freq[ch] & 0x700)); sweep_sqr(apu, ch); if (apu.scounter[ch] > apu.freq[ch]) { apu.scounter[ch] = apu.freq[ch]; } break; case 0x3: case 0x7: apu.freq[ch] = (Int32)((UInt32)(apu.freq[ch] & 0xFF) | ((val & 0x7) << 8)); if (apu.option[(int)OPT.OPT_PHASE_REFRESH] != 0) { apu.sphase[ch] = 0; } apu.envelope_write[ch] = true; if (apu.enable[ch]) { apu.length_counter[ch] = length_table[(val >> 3) & 0x1f]; } sweep_sqr(apu, ch); if (apu.scounter[ch] > apu.freq[ch]) { apu.scounter[ch] = apu.freq[ch]; } break; default: return(false); } apu.reg[adr] = (byte)val; return(true); } else if (adr == 0x4015) { apu.enable[0] = (val & 1) != 0 ? true : false; apu.enable[1] = (val & 2) != 0 ? true : false; if (!apu.enable[0]) { apu.length_counter[0] = 0; } if (!apu.enable[1]) { apu.length_counter[1] = 0; } apu.reg[adr - 0x4000] = (byte)val; return(true); } // 4017 is handled in np_nes_dmc.c //else if (adr == 0x4017) //{ //} return(false); }
public void NES_APU_np_SetMask(NES_APU chip, Int32 m) { NES_APU apu = (NES_APU)chip; apu.mask = m; }
public void NES_APU_np_SetClock(NES_APU chip, double c) { NES_APU apu = (NES_APU)chip; apu.clock = c; }
public void NES_APU_np_Destroy(NES_APU chip) { //free(chip); }
public void Tick(NES_APU apu, UInt32 clocks) { apu._out[0] = calc_sqr(apu, 0, clocks); apu._out[1] = calc_sqr(apu, 1, clocks); }
public void NES_APU_np_FrameSequence(NES_APU chip, int s) { NES_APU apu = (NES_APU)chip; Int32 i; //DEBUG_OUT("FrameSequence(%d)\n",s); if (s > 3) { return; // no operation in step 4 } // 240hz clock for (i = 0; i < 2; ++i) { bool divider = false; if (apu.envelope_write[i]) { apu.envelope_write[i] = false; apu.envelope_counter[i] = 15; apu.envelope_div[i] = 0; } else { ++apu.envelope_div[i]; if (apu.envelope_div[i] > apu.envelope_div_period[i]) { divider = true; apu.envelope_div[i] = 0; } } if (divider) { if (apu.envelope_loop[i] && apu.envelope_counter[i] == 0) { apu.envelope_counter[i] = 15; } else if (apu.envelope_counter[i] > 0) { --apu.envelope_counter[i]; } } } // 120hz clock if ((s & 1) == 0) { for (i = 0; i < 2; ++i) { if (!apu.envelope_loop[i] && (apu.length_counter[i] > 0)) { --apu.length_counter[i]; } if (apu.sweep_enable[i]) { //DEBUG_OUT("Clock sweep: %d\n", i); --apu.sweep_div[i]; if (apu.sweep_div[i] <= 0) { sweep_sqr(apu, i); // calculate new sweep target //DEBUG_OUT("sweep_div[%d] (0/%d)\n",i,apu->sweep_div_period[i]); //DEBUG_OUT("freq[%d]=%d > sfreq[%d]=%d\n",i,apu->freq[i],i,apu->sfreq[i]); if (apu.freq[i] >= 8 && apu.sfreq[i] < 0x800 && apu.sweep_amount[i] > 0) // update frequency if appropriate { apu.freq[i] = apu.sfreq[i] < 0 ? 0 : apu.sfreq[i]; if (apu.scounter[i] > apu.freq[i]) { apu.scounter[i] = apu.freq[i]; } } apu.sweep_div[i] = apu.sweep_div_period[i] + 1; //DEBUG_OUT("freq[%d]=%d\n",i,apu->freq[i]); } if (apu.sweep_write[i]) { apu.sweep_div[i] = apu.sweep_div_period[i] + 1; apu.sweep_write[i] = false; } } } } }