872 lines
19 KiB
C
872 lines
19 KiB
C
// Ported from NSFPlay to VGMPlay (including C++ -> C conversion)
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// by Valley Bell on 25 September 2013
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// Updated to NSFPlay 2.3 on 26 September 2013
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// (Note: Encoding is UTF-8)
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#include <stdlib.h> // for rand()
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#include <memory.h> // for memset()
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#include <stddef.h> // for NULL
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#include "mamedef.h"
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#include "../stdbool.h"
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#include "np_nes_apu.h" // for NES_APU_np_FrameSequence
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#include "np_nes_dmc.h"
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// Master Clock: 21477272 (NTSC)
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// APU Clock = Master Clock / 12
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#define DEFAULT_CLOCK 1789772.0
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#define DEFAULT_CLK_PAL 1662607
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#define DEFAULT_RATE 44100
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/** Bottom Half of APU **/
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enum
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{
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OPT_UNMUTE_ON_RESET=0,
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OPT_NONLINEAR_MIXER,
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OPT_ENABLE_4011,
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OPT_ENABLE_PNOISE,
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OPT_DPCM_ANTI_CLICK,
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OPT_RANDOMIZE_NOISE,
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OPT_TRI_MUTE,
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OPT_TRI_NULL,
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OPT_END
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};
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// Note: For increased speed, I'll inline all of NSFPlay's Counter member functions.
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#define COUNTER_SHIFT 24
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typedef struct _Counter Counter;
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struct _Counter
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{
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double ratio;
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UINT32 val, step;
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};
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#define COUNTER_setcycle(cntr, s) (cntr).step = (UINT32)((cntr).ratio / (s + 1))
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#define COUNTER_iup(cntr) (cntr).val += (cntr).step
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#define COUNTER_value(cntr) ((cntr).val >> COUNTER_SHIFT)
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#define COUNTER_init(cntr, clk, rate) \
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{ \
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(cntr).ratio = (1 << COUNTER_SHIFT) * (1.0 * clk / rate); \
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(cntr).step = (UINT32)((cntr).ratio + 0.5); \
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(cntr).val = 0; \
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}
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typedef struct _NES_DMC NES_DMC;
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struct _NES_DMC
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{
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//const int GETA_BITS;
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//static const UINT32 freq_table[2][16];
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//static const UINT32 wavlen_table[2][16];
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UINT32 tnd_table[2][16][16][128];
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int option[OPT_END];
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int mask;
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INT32 sm[2][3];
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UINT8 reg[0x10];
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UINT32 len_reg;
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UINT32 adr_reg;
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//IDevice *memory;
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const UINT8* memory;
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UINT32 out[3];
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UINT32 daddress;
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UINT32 length;
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UINT32 data;
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INT16 damp;
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int dac_lsb;
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bool dmc_pop;
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INT32 dmc_pop_offset;
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INT32 dmc_pop_follow;
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UINT32 clock;
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UINT32 rate;
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int pal;
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int mode;
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bool irq;
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bool active;
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UINT32 counter[3]; // frequency dividers
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int tphase; // triangle phase
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UINT32 nfreq; // noise frequency
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UINT32 dfreq; // DPCM frequency
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UINT32 tri_freq;
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int linear_counter;
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int linear_counter_reload;
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bool linear_counter_halt;
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bool linear_counter_control;
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int noise_volume;
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UINT32 noise, noise_tap;
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// noise envelope
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bool envelope_loop;
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bool envelope_disable;
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bool envelope_write;
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int envelope_div_period;
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int envelope_div;
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int envelope_counter;
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bool enable[3];
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int length_counter[2]; // 0=tri, 1=noise
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// frame sequencer
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void* apu; // apu is clocked by DMC's frame sequencer
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int frame_sequence_count; // current cycle count
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int frame_sequence_length; // CPU cycles per FrameSequence
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int frame_sequence_step; // current step of frame sequence
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int frame_sequence_steps; // 4/5 steps per frame
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bool frame_irq;
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bool frame_irq_enable;
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Counter tick_count;
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UINT32 tick_last;
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};
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INLINE UINT32 calc_tri(NES_DMC* dmc, UINT32 clocks);
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INLINE UINT32 calc_dmc(NES_DMC* dmc, UINT32 clocks);
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INLINE UINT32 calc_noise(NES_DMC* dmc, UINT32 clocks);
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static void FrameSequence(NES_DMC* dmc, int s);
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static void TickFrameSequence(NES_DMC* dmc, UINT32 clocks);
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static void Tick(NES_DMC* dmc, UINT32 clocks);
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#define GETA_BITS 20
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static const UINT32 wavlen_table[2][16] = {
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{ // NTSC
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4, 8, 16, 32, 64, 96, 128, 160, 202, 254, 380, 508, 762, 1016, 2034, 4068
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},
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{ // PAL
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4, 8, 14, 30, 60, 88, 118, 148, 188, 236, 354, 472, 708, 944, 1890, 3778
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}};
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static const UINT32 freq_table[2][16] = {
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{ // NTSC
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428, 380, 340, 320, 286, 254, 226, 214, 190, 160, 142, 128, 106, 84, 72, 54
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},
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{ // PAL
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398, 354, 316, 298, 276, 236, 210, 198, 176, 148, 132, 118, 98, 78, 66, 50
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}};
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void* NES_DMC_np_Create(int clock, int rate)
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{
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NES_DMC* dmc;
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int c, t;
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dmc = (NES_DMC*)malloc(sizeof(NES_DMC));
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if (dmc == NULL)
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return NULL;
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memset(dmc, 0x00, sizeof(NES_DMC));
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//NES_DMC_np_SetClock(dmc, DEFAULT_CLOCK);
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//NES_DMC_np_SetRate(dmc, DEFAULT_RATE);
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//NES_DMC_np_SetPal(dmc, false);
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NES_DMC_np_SetClock(dmc, clock); // does SetPal, too
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NES_DMC_np_SetRate(dmc, rate);
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dmc->option[OPT_ENABLE_4011] = 1;
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dmc->option[OPT_ENABLE_PNOISE] = 1;
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dmc->option[OPT_UNMUTE_ON_RESET] = 1;
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dmc->option[OPT_DPCM_ANTI_CLICK] = 0;
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dmc->option[OPT_NONLINEAR_MIXER] = 1;
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dmc->option[OPT_RANDOMIZE_NOISE] = 1;
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dmc->option[OPT_TRI_MUTE] = 1;
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dmc->tnd_table[0][0][0][0] = 0;
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dmc->tnd_table[1][0][0][0] = 0;
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dmc->apu = NULL;
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dmc->frame_sequence_count = 0;
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dmc->frame_sequence_length = 7458;
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dmc->frame_sequence_steps = 4;
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for(c=0;c<2;++c)
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for(t=0;t<3;++t)
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dmc->sm[c][t] = 128;
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return dmc;
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}
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void NES_DMC_np_Destroy(void* chip)
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{
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free(chip);
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}
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int NES_DMC_np_GetDamp(void* chip)
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{
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NES_DMC* dmc = (NES_DMC*)chip;
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return (dmc->damp<<1)|dmc->dac_lsb;
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}
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void NES_DMC_np_SetMask(void* chip, int m)
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{
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NES_DMC* dmc = (NES_DMC*)chip;
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dmc->mask = m;
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}
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void NES_DMC_np_SetStereoMix(void* chip, int trk, INT16 mixl, INT16 mixr)
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{
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NES_DMC* dmc = (NES_DMC*)chip;
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if (trk < 0) return;
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if (trk > 2) return;
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dmc->sm[0][trk] = mixl;
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dmc->sm[1][trk] = mixr;
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}
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static void FrameSequence(NES_DMC* dmc, int s)
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{
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//DEBUG_OUT("FrameSequence: %d\n",s);
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if (s > 3) return; // no operation in step 4
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if (dmc->apu != NULL)
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{
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NES_APU_np_FrameSequence(dmc->apu, s);
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}
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if (s == 0 && (dmc->frame_sequence_steps == 4))
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{
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dmc->frame_irq = true;
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}
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// 240hz clock
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{
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bool divider = false;
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// triangle linear counter
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if (dmc->linear_counter_halt)
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{
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dmc->linear_counter = dmc->linear_counter_reload;
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}
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else
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{
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if (dmc->linear_counter > 0) --dmc->linear_counter;
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}
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if (!dmc->linear_counter_control)
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{
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dmc->linear_counter_halt = false;
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}
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// noise envelope
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//bool divider = false;
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if (dmc->envelope_write)
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{
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dmc->envelope_write = false;
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dmc->envelope_counter = 15;
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dmc->envelope_div = 0;
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}
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else
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{
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++dmc->envelope_div;
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if (dmc->envelope_div > dmc->envelope_div_period)
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{
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divider = true;
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dmc->envelope_div = 0;
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}
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}
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if (divider)
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{
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if (dmc->envelope_loop && dmc->envelope_counter == 0)
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dmc->envelope_counter = 15;
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else if (dmc->envelope_counter > 0)
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--dmc->envelope_counter; // TODO: Make this work.
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}
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}
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// 120hz clock
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if ((s&1) == 0)
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{
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// triangle length counter
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if (!dmc->linear_counter_control && (dmc->length_counter[0] > 0))
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--dmc->length_counter[0];
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// noise length counter
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if (!dmc->envelope_loop && (dmc->length_counter[1] > 0))
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--dmc->length_counter[1];
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}
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}
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// 三角波チャンネルの計算 戻り値は0-15
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UINT32 calc_tri(NES_DMC* dmc, UINT32 clocks)
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{
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static UINT32 tritbl[32] =
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{
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0, 1, 2, 3, 4, 5, 6, 7,
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8, 9,10,11,12,13,14,15,
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15,14,13,12,11,10, 9, 8,
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7, 6, 5, 4, 3, 2, 1, 0
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};
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if (dmc->linear_counter > 0 && dmc->length_counter[0] > 0
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&& (!dmc->option[OPT_TRI_MUTE] || dmc->tri_freq > 0))
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{
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dmc->counter[0] += clocks;
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while (dmc->counter[0] > dmc->tri_freq)
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{
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dmc->tphase = (dmc->tphase + 1) & 31;
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dmc->counter[0] -= (dmc->tri_freq + 1);
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}
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}
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// Note: else-block added by VB
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else if (dmc->option[OPT_TRI_NULL])
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{
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if (dmc->tphase && dmc->tphase < 31)
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{
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// Finish the Triangle wave to prevent clicks.
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dmc->counter[0] += clocks;
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while(dmc->counter[0] > dmc->tri_freq && dmc->tphase)
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{
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dmc->tphase = (dmc->tphase + 1) & 31;
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dmc->counter[0] -= (dmc->tri_freq + 1);
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}
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}
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}
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//UINT32 ret = tritbl[tphase];
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//return ret;
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return tritbl[dmc->tphase];
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}
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// ノイズチャンネルの計算 戻り値は0-127
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// 低サンプリングレートで合成するとエイリアスノイズが激しいので
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// ノイズだけはこの関数内で高クロック合成し、簡易なサンプリングレート
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// 変換を行っている。
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UINT32 calc_noise(NES_DMC* dmc, UINT32 clocks)
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{
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UINT32 env, last, count, accum, clocks_accum;
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env = dmc->envelope_disable ? dmc->noise_volume : dmc->envelope_counter;
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if (dmc->length_counter[1] < 1) env = 0;
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last = (dmc->noise & 0x4000) ? env : 0;
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if (clocks < 1) return last;
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// simple anti-aliasing (noise requires it, even when oversampling is off)
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count = 0;
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accum = 0;
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dmc->counter[1] += clocks;
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// assert(dmc->nfreq > 0); // prevent infinite loop
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if (dmc->nfreq <= 0) // prevent infinite loop -VB
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return last;
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while (dmc->counter[1] >= dmc->nfreq)
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{
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// tick the noise generator
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UINT32 feedback = (dmc->noise&1) ^ ((dmc->noise&dmc->noise_tap)?1:0);
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dmc->noise = (dmc->noise>>1) | (feedback<<14);
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++count;
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accum += last;
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last = (dmc->noise & 0x4000) ? env : 0;
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dmc->counter[1] -= dmc->nfreq;
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}
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if (count < 1) // no change over interval, don't anti-alias
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{
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return last;
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}
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clocks_accum = clocks - dmc->counter[1];
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// count = number of samples in accum
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// counter[1] = number of clocks since last sample
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accum = (accum * clocks_accum) + (last * dmc->counter[1] * count);
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// note accum as an average is already premultiplied by count
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return accum / (clocks * count);
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}
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// DMCチャンネルの計算 戻り値は0-127
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UINT32 calc_dmc(NES_DMC* dmc, UINT32 clocks)
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{
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dmc->counter[2] += clocks;
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// assert(dmc->dfreq > 0); // prevent infinite loop
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if (dmc->dfreq <= 0) // prevent infinite loop -VB
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return (dmc->damp<<1) + dmc->dac_lsb;
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while (dmc->counter[2] >= dmc->dfreq)
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{
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if ( dmc->data != 0x100 ) // data = 0x100 は EMPTY を意味する。
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{
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if ((dmc->data & 1) && (dmc->damp < 63))
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dmc->damp++;
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else if (!(dmc->data & 1) && (0 < dmc->damp))
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dmc->damp--;
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dmc->data >>=1;
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}
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if ( dmc->data == 0x100 && dmc->active )
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{
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//dmc->memory->Read(dmc->daddress, dmc->data);
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dmc->data = dmc->memory[dmc->daddress];
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dmc->data |= (dmc->data&0xFF)|0x10000; // 8bitシフトで 0x100 になる
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if ( dmc->length > 0 )
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{
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dmc->daddress = ((dmc->daddress+1)&0xFFFF)|0x8000 ;
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dmc->length --;
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}
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}
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if ( dmc->length == 0 ) // 最後のフェッチが終了したら(再生完了より前に)即座に終端処理
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{
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if (dmc->mode & 1)
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{
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dmc->daddress = ((dmc->adr_reg<<6)|0xC000);
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dmc->length = (dmc->len_reg<<4)+1;
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}
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else
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{
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dmc->irq = (dmc->mode==2&&dmc->active)?1:0; // 直前がactiveだったときはIRQ発行
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dmc->active = false;
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}
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}
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dmc->counter[2] -= dmc->dfreq;
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}
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return (dmc->damp<<1) + dmc->dac_lsb;
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}
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static void TickFrameSequence(NES_DMC* dmc, UINT32 clocks)
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{
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dmc->frame_sequence_count += clocks;
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while (dmc->frame_sequence_count > dmc->frame_sequence_length)
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{
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FrameSequence(dmc, dmc->frame_sequence_step);
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dmc->frame_sequence_count -= dmc->frame_sequence_length;
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++dmc->frame_sequence_step;
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if(dmc->frame_sequence_step >= dmc->frame_sequence_steps)
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dmc->frame_sequence_step = 0;
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}
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}
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static void Tick(NES_DMC* dmc, UINT32 clocks)
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{
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dmc->out[0] = calc_tri(dmc, clocks);
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dmc->out[1] = calc_noise(dmc, clocks);
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dmc->out[2] = calc_dmc(dmc, clocks);
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}
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UINT32 NES_DMC_np_Render(void* chip, INT32 b[2])
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{
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NES_DMC* dmc = (NES_DMC*)chip;
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UINT32 clocks;
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INT32 m[3];
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COUNTER_iup(dmc->tick_count); // increase counter (overflows after 255)
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clocks = (COUNTER_value(dmc->tick_count) - dmc->tick_last) & 0xFF;
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TickFrameSequence(dmc, clocks);
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Tick(dmc, clocks);
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dmc->tick_last = COUNTER_value(dmc->tick_count);
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dmc->out[0] = (dmc->mask & 1) ? 0 : dmc->out[0];
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dmc->out[1] = (dmc->mask & 2) ? 0 : dmc->out[1];
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dmc->out[2] = (dmc->mask & 4) ? 0 : dmc->out[2];
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m[0] = dmc->tnd_table[0][dmc->out[0]][0][0];
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m[1] = dmc->tnd_table[0][0][dmc->out[1]][0];
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m[2] = dmc->tnd_table[0][0][0][dmc->out[2]];
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if (dmc->option[OPT_NONLINEAR_MIXER])
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{
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INT32 ref = m[0] + m[1] + m[2];
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INT32 voltage = dmc->tnd_table[1][dmc->out[0]][dmc->out[1]][dmc->out[2]];
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int i;
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if (ref)
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{
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for (i=0; i < 3; ++i)
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m[i] = (m[i] * voltage) / ref;
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}
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else
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{
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for (i=0; i < 3; ++i)
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m[i] = voltage;
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}
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}
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// anti-click nullifies any 4011 write but preserves nonlinearity
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if (dmc->option[OPT_DPCM_ANTI_CLICK])
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{
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if (dmc->dmc_pop) // $4011 will cause pop this frame
|
|
{
|
|
// adjust offset to counteract pop
|
|
dmc->dmc_pop_offset += dmc->dmc_pop_follow - m[2];
|
|
dmc->dmc_pop = false;
|
|
|
|
// prevent overflow, keep headspace at edges
|
|
//const INT32 OFFSET_MAX = (1 << 30) - (4 << 16);
|
|
#define OFFSET_MAX ((1 << 30) - (4 << 16))
|
|
if (dmc->dmc_pop_offset > OFFSET_MAX) dmc->dmc_pop_offset = OFFSET_MAX;
|
|
if (dmc->dmc_pop_offset < -OFFSET_MAX) dmc->dmc_pop_offset = -OFFSET_MAX;
|
|
}
|
|
dmc->dmc_pop_follow = m[2]; // remember previous position
|
|
|
|
m[2] += dmc->dmc_pop_offset; // apply offset
|
|
|
|
// TODO implement this in a better way
|
|
// roll off offset (not ideal, but prevents overflow)
|
|
if (dmc->dmc_pop_offset > 0) --dmc->dmc_pop_offset;
|
|
else if (dmc->dmc_pop_offset < 0) ++dmc->dmc_pop_offset;
|
|
}
|
|
|
|
b[0] = m[0] * dmc->sm[0][0];
|
|
b[0] += m[1] * dmc->sm[0][1];
|
|
b[0] +=-m[2] * dmc->sm[0][2];
|
|
b[0] >>= 7-2;
|
|
|
|
b[1] = m[0] * dmc->sm[1][0];
|
|
b[1] += m[1] * dmc->sm[1][1];
|
|
b[1] +=-m[2] * dmc->sm[1][2];
|
|
b[1] >>= 7-2;
|
|
|
|
return 2;
|
|
}
|
|
|
|
|
|
void NES_DMC_np_SetClock(void* chip, double c)
|
|
{
|
|
NES_DMC* dmc = (NES_DMC*)chip;
|
|
|
|
dmc->clock = (UINT32)(c);
|
|
|
|
if (abs(dmc->clock - DEFAULT_CLK_PAL) <= 1000) // check for approximately DEFAULT_CLK_PAL
|
|
NES_DMC_np_SetPal(dmc, true);
|
|
else
|
|
NES_DMC_np_SetPal(dmc, false);
|
|
}
|
|
|
|
void NES_DMC_np_SetRate(void* chip, double r)
|
|
{
|
|
NES_DMC* dmc = (NES_DMC*)chip;
|
|
|
|
dmc->rate = (UINT32)(r?r:DEFAULT_RATE);
|
|
|
|
COUNTER_init(dmc->tick_count, dmc->clock, dmc->rate);
|
|
dmc->tick_last = 0;
|
|
}
|
|
|
|
void NES_DMC_np_SetPal(void* chip, bool is_pal)
|
|
{
|
|
NES_DMC* dmc = (NES_DMC*)chip;
|
|
|
|
dmc->pal = (is_pal ? 1 : 0);
|
|
// set CPU cycles in frame_sequence
|
|
dmc->frame_sequence_length = is_pal ? 8314 : 7458;
|
|
}
|
|
|
|
void NES_DMC_np_SetAPU(void* chip, void* apu_)
|
|
{
|
|
NES_DMC* dmc = (NES_DMC*)chip;
|
|
|
|
dmc->apu = apu_;
|
|
}
|
|
|
|
// Initializing TRI, NOISE, DPCM mixing table
|
|
static void InitializeTNDTable(NES_DMC* dmc, double wt, double wn, double wd)
|
|
{
|
|
// volume adjusted by 0.75 based on empirical measurements
|
|
const double MASTER = 8192.0 * 0.75;
|
|
// truthfully, the nonlinear curve does not appear to match well
|
|
// with my tests, triangle in particular seems too quiet relatively.
|
|
// do more testing of the APU/DMC DAC later
|
|
|
|
int t, n, d;
|
|
|
|
{ // Linear Mixer
|
|
for(t=0; t<16 ; t++) {
|
|
for(n=0; n<16; n++) {
|
|
for(d=0; d<128; d++) {
|
|
dmc->tnd_table[0][t][n][d] = (UINT32)(MASTER*(3.0*t+2.0*n+d)/208.0);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
{ // Non-Linear Mixer
|
|
dmc->tnd_table[1][0][0][0] = 0;
|
|
for(t=0; t<16 ; t++) {
|
|
for(n=0; n<16; n++) {
|
|
for(d=0; d<128; d++) {
|
|
if(t!=0||n!=0||d!=0)
|
|
dmc->tnd_table[1][t][n][d] = (UINT32)((MASTER*159.79)/(100.0+1.0/((double)t/wt+(double)n/wn+(double)d/wd)));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
void NES_DMC_np_Reset(void* chip)
|
|
{
|
|
NES_DMC* dmc = (NES_DMC*)chip;
|
|
int i;
|
|
dmc->mask = 0;
|
|
|
|
InitializeTNDTable(dmc,8227,12241,22638);
|
|
|
|
dmc->counter[0] = 0;
|
|
dmc->counter[1] = 0;
|
|
dmc->counter[2] = 0;
|
|
dmc->tphase = 0;
|
|
dmc->nfreq = wavlen_table[0][0];
|
|
dmc->dfreq = freq_table[0][0];
|
|
|
|
dmc->envelope_div = 0;
|
|
dmc->length_counter[0] = 0;
|
|
dmc->length_counter[1] = 0;
|
|
dmc->linear_counter = 0;
|
|
dmc->envelope_counter = 0;
|
|
|
|
dmc->frame_irq = false;
|
|
dmc->frame_irq_enable = false;
|
|
dmc->frame_sequence_count = 0;
|
|
dmc->frame_sequence_steps = 4;
|
|
dmc->frame_sequence_step = 0;
|
|
|
|
for (i = 0; i < 0x10; i++)
|
|
NES_DMC_np_Write(dmc, 0x4008 + i, 0);
|
|
|
|
dmc->irq = false;
|
|
NES_DMC_np_Write(dmc, 0x4015, 0x00);
|
|
if (dmc->option[OPT_UNMUTE_ON_RESET])
|
|
NES_DMC_np_Write(dmc, 0x4015, 0x0f);
|
|
|
|
dmc->out[0] = dmc->out[1] = dmc->out[2] = 0;
|
|
dmc->tri_freq = 0;
|
|
dmc->damp = 0;
|
|
dmc->dmc_pop = false;
|
|
dmc->dmc_pop_offset = 0;
|
|
dmc->dmc_pop_follow = 0;
|
|
dmc->dac_lsb = 0;
|
|
dmc->data = 0x100;
|
|
dmc->adr_reg = 0;
|
|
dmc->active = false;
|
|
dmc->length = 0;
|
|
dmc->len_reg = 0;
|
|
dmc->daddress = 0;
|
|
dmc->noise = 1;
|
|
dmc->noise_tap = (1<<1);
|
|
if (dmc->option[OPT_RANDOMIZE_NOISE])
|
|
{
|
|
dmc->noise |= rand();
|
|
}
|
|
|
|
NES_DMC_np_SetRate(dmc, dmc->rate);
|
|
}
|
|
|
|
void NES_DMC_np_SetMemory(void* chip, const UINT8* r)
|
|
{
|
|
NES_DMC* dmc = (NES_DMC*)chip;
|
|
|
|
dmc->memory = r;
|
|
}
|
|
|
|
void NES_DMC_np_SetOption(void* chip, int id, int val)
|
|
{
|
|
NES_DMC* dmc = (NES_DMC*)chip;
|
|
|
|
if(id<OPT_END)
|
|
{
|
|
dmc->option[id] = val;
|
|
if(id==OPT_NONLINEAR_MIXER)
|
|
InitializeTNDTable(dmc, 8227,12241,22638);
|
|
}
|
|
}
|
|
|
|
bool NES_DMC_np_Write(void* chip, UINT32 adr, UINT32 val)
|
|
{
|
|
static const UINT8 length_table[32] = {
|
|
0x0A, 0xFE,
|
|
0x14, 0x02,
|
|
0x28, 0x04,
|
|
0x50, 0x06,
|
|
0xA0, 0x08,
|
|
0x3C, 0x0A,
|
|
0x0E, 0x0C,
|
|
0x1A, 0x0E,
|
|
0x0C, 0x10,
|
|
0x18, 0x12,
|
|
0x30, 0x14,
|
|
0x60, 0x16,
|
|
0xC0, 0x18,
|
|
0x48, 0x1A,
|
|
0x10, 0x1C,
|
|
0x20, 0x1E
|
|
};
|
|
NES_DMC* dmc = (NES_DMC*)chip;
|
|
|
|
if (adr == 0x4015)
|
|
{
|
|
dmc->enable[0] = (val & 4) ? true : false;
|
|
dmc->enable[1] = (val & 8) ? true : false;
|
|
|
|
if (!dmc->enable[0])
|
|
{
|
|
dmc->length_counter[0] = 0;
|
|
}
|
|
if (!dmc->enable[1])
|
|
{
|
|
dmc->length_counter[1] = 0;
|
|
}
|
|
|
|
if ((val & 16)&&!dmc->active)
|
|
{
|
|
dmc->enable[2] = dmc->active = true;
|
|
dmc->daddress = (0xC000 | (dmc->adr_reg << 6));
|
|
dmc->length = (dmc->len_reg << 4) + 1;
|
|
dmc->irq = 0;
|
|
}
|
|
else if (!(val & 16))
|
|
{
|
|
dmc->enable[2] = dmc->active = false;
|
|
}
|
|
|
|
dmc->reg[adr-0x4008] = val;
|
|
return true;
|
|
}
|
|
|
|
if (adr == 0x4017)
|
|
{
|
|
//DEBUG_OUT("4017 = %02X\n", val);
|
|
dmc->frame_irq_enable = ((val & 0x40) == 0x40);
|
|
dmc->frame_irq = (dmc->frame_irq_enable ? dmc->frame_irq : 0);
|
|
dmc->frame_sequence_count = 0;
|
|
if (val & 0x80)
|
|
{
|
|
dmc->frame_sequence_steps = 5;
|
|
dmc->frame_sequence_step = 0;
|
|
FrameSequence(dmc, dmc->frame_sequence_step);
|
|
++dmc->frame_sequence_step;
|
|
}
|
|
else
|
|
{
|
|
dmc->frame_sequence_steps = 4;
|
|
dmc->frame_sequence_step = 1;
|
|
}
|
|
}
|
|
|
|
if (adr<0x4008||0x4013<adr)
|
|
return false;
|
|
|
|
dmc->reg[adr-0x4008] = val&0xff;
|
|
|
|
//DEBUG_OUT("$%04X %02X\n", adr, val);
|
|
|
|
switch (adr)
|
|
{
|
|
|
|
// tri
|
|
|
|
case 0x4008:
|
|
dmc->linear_counter_control = (val >> 7) & 1;
|
|
dmc->linear_counter_reload = val & 0x7F;
|
|
break;
|
|
|
|
case 0x4009:
|
|
break;
|
|
|
|
case 0x400a:
|
|
dmc->tri_freq = val | (dmc->tri_freq & 0x700) ;
|
|
if (dmc->counter[0] > dmc->tri_freq) dmc->counter[0] = dmc->tri_freq;
|
|
break;
|
|
|
|
case 0x400b:
|
|
dmc->tri_freq = (dmc->tri_freq & 0xff) | ((val & 0x7) << 8) ;
|
|
if (dmc->counter[0] > dmc->tri_freq) dmc->counter[0] = dmc->tri_freq;
|
|
dmc->linear_counter_halt = true;
|
|
if (dmc->enable[0])
|
|
{
|
|
dmc->length_counter[0] = length_table[(val >> 3) & 0x1f];
|
|
}
|
|
break;
|
|
|
|
// noise
|
|
|
|
case 0x400c:
|
|
dmc->noise_volume = val & 15;
|
|
dmc->envelope_div_period = val & 15;
|
|
dmc->envelope_disable = (val >> 4) & 1;
|
|
dmc->envelope_loop = (val >> 5) & 1;
|
|
break;
|
|
|
|
case 0x400d:
|
|
break;
|
|
|
|
case 0x400e:
|
|
if (dmc->option[OPT_ENABLE_PNOISE])
|
|
dmc->noise_tap = (val & 0x80) ? (1<<6) : (1<<1);
|
|
else
|
|
dmc->noise_tap = (1<<1);
|
|
dmc->nfreq = wavlen_table[dmc->pal][val&15];
|
|
if (dmc->counter[1] > dmc->nfreq) dmc->counter[1] = dmc->nfreq;
|
|
break;
|
|
|
|
case 0x400f:
|
|
if (dmc->enable[1])
|
|
{
|
|
dmc->length_counter[1] = length_table[(val >> 3) & 0x1f];
|
|
}
|
|
dmc->envelope_write = true;
|
|
break;
|
|
|
|
// dmc
|
|
|
|
case 0x4010:
|
|
dmc->mode = (val >> 6) & 3;
|
|
dmc->dfreq = freq_table[dmc->pal][val&15];
|
|
if (dmc->counter[2] > dmc->dfreq) dmc->counter[2] = dmc->dfreq;
|
|
break;
|
|
|
|
case 0x4011:
|
|
if (dmc->option[OPT_ENABLE_4011])
|
|
{
|
|
dmc->damp = (val >> 1) & 0x3f;
|
|
dmc->dac_lsb = val & 1;
|
|
dmc->dmc_pop = true;
|
|
}
|
|
break;
|
|
|
|
case 0x4012:
|
|
dmc->adr_reg = val&0xff;
|
|
// ここでdaddressは更新されない
|
|
break;
|
|
|
|
case 0x4013:
|
|
dmc->len_reg = val&0xff;
|
|
// ここでlengthは更新されない
|
|
break;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool NES_DMC_np_Read(void* chip, UINT32 adr, UINT32* val)
|
|
{
|
|
NES_DMC* dmc = (NES_DMC*)chip;
|
|
|
|
if (adr == 0x4015)
|
|
{
|
|
*val |= (dmc->irq?128:0)
|
|
| (dmc->frame_irq ? 0x40 : 0)
|
|
| (dmc->active?16:0)
|
|
| (dmc->length_counter[1]?8:0)
|
|
| (dmc->length_counter[0]?4:0)
|
|
;
|
|
|
|
dmc->frame_irq = false;
|
|
return true;
|
|
}
|
|
else if (0x4008<=adr&&adr<=0x4014)
|
|
{
|
|
*val |= dmc->reg[adr-0x4008];
|
|
return true;
|
|
}
|
|
else
|
|
return false;
|
|
}
|