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InfoNES_pAPU.cpp
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InfoNES_pAPU.cpp
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/*===================================================================*/
/* */
/* InfoNES_pAPU.cpp : InfoNES Sound Emulation Function */
/* */
/* 2000/05/29 InfoNES Project ( based on DarcNES and NesterJ ) */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Include files */
/*-------------------------------------------------------------------*/
#include "K6502.h"
#include "K6502_rw.h"
#include "InfoNES_System.h"
#include "InfoNES_pAPU.h"
/*-------------------------------------------------------------------*/
/* APU Event resources */
/*-------------------------------------------------------------------*/
struct ApuEvent_t ApuEventQueue[ APU_EVENT_MAX ];
int cur_event;
WORD entertime;
/*-------------------------------------------------------------------*/
/* APU Register Write Functions */
/*-------------------------------------------------------------------*/
#define APU_WRITEFUNC(name, evtype) \
void ApuWrite##name(WORD addr, BYTE value) \
{ \
ApuEventQueue[cur_event].time = entertime - g_wPassedClocks; \
ApuEventQueue[cur_event].type = APUET_W_##evtype; \
ApuEventQueue[cur_event].data = value; \
cur_event++; \
}
APU_WRITEFUNC(C1a, C1A);
APU_WRITEFUNC(C1b, C1B);
APU_WRITEFUNC(C1c, C1C);
APU_WRITEFUNC(C1d, C1D);
APU_WRITEFUNC(C2a, C2A);
APU_WRITEFUNC(C2b, C2B);
APU_WRITEFUNC(C2c, C2C);
APU_WRITEFUNC(C2d, C2D);
APU_WRITEFUNC(C3a, C3A);
APU_WRITEFUNC(C3b, C3B);
APU_WRITEFUNC(C3c, C3C);
APU_WRITEFUNC(C3d, C3D);
APU_WRITEFUNC(C4a, C4A);
APU_WRITEFUNC(C4b, C4B);
APU_WRITEFUNC(C4c, C4C);
APU_WRITEFUNC(C4d, C4D);
APU_WRITEFUNC(C5a, C5A);
APU_WRITEFUNC(C5b, C5B);
APU_WRITEFUNC(C5c, C5C);
APU_WRITEFUNC(C5d, C5D);
APU_WRITEFUNC(Control, CTRL);
ApuWritefunc pAPUSoundRegs[20] =
{
ApuWriteC1a,
ApuWriteC1b,
ApuWriteC1c,
ApuWriteC1d,
ApuWriteC2a,
ApuWriteC2b,
ApuWriteC2c,
ApuWriteC2d,
ApuWriteC3a,
ApuWriteC3b,
ApuWriteC3c,
ApuWriteC3d,
ApuWriteC4a,
ApuWriteC4b,
ApuWriteC4c,
ApuWriteC4d,
ApuWriteC5a,
ApuWriteC5b,
ApuWriteC5c,
ApuWriteC5d,
};
/*-------------------------------------------------------------------*/
/* APU resources */
/*-------------------------------------------------------------------*/
BYTE wave_buffers[5][735]; /* 44100 / 60 = 735 samples per sync */
BYTE ApuCtrl;
BYTE ApuCtrlNew;
/*-------------------------------------------------------------------*/
/* APU Quality resources */
/*-------------------------------------------------------------------*/
int ApuQuality;
DWORD ApuPulseMagic;
DWORD ApuTriangleMagic;
DWORD ApuNoiseMagic;
unsigned int ApuSamplesPerSync;
unsigned int ApuCyclesPerSample;
unsigned int ApuSampleRate;
DWORD ApuCycleRate;
struct ApuQualityData_t
{
DWORD pulse_magic;
DWORD triangle_magic;
DWORD noise_magic;
unsigned int samples_per_sync;
unsigned int cycles_per_sample;
unsigned int sample_rate;
DWORD cycle_rate;
} ApuQual[] = {
{ 0xa2567000, 0xa2567000, 0xa2567000, 183, 164, 11025, 1062658 },
{ 0x512b3800, 0x512b3800, 0x512b3800, 367, 82, 22050, 531329 },
{ 0x289d9c00, 0x289d9c00, 0x289d9c00, 735, 41, 44100, 265664 },
};
/*-------------------------------------------------------------------*/
/* Rectangle Wave #1 resources */
/*-------------------------------------------------------------------*/
BYTE ApuC1a, ApuC1b, ApuC1c, ApuC1d;
BYTE* ApuC1Wave;
DWORD ApuC1Skip;
DWORD ApuC1Index;
DWORD ApuC1EnvPhase;
BYTE ApuC1EnvVol;
BYTE ApuC1Atl;
DWORD ApuC1SweepPhase;
DWORD ApuC1Freq;
/*-------------------------------------------------------------------*/
/* Rectangle Wave #2 resources */
/*-------------------------------------------------------------------*/
BYTE ApuC2a, ApuC2b, ApuC2c, ApuC2d;
BYTE* ApuC2Wave;
DWORD ApuC2Skip;
DWORD ApuC2Index;
DWORD ApuC2EnvPhase;
BYTE ApuC2EnvVol;
BYTE ApuC2Atl;
DWORD ApuC2SweepPhase;
DWORD ApuC2Freq;
/*-------------------------------------------------------------------*/
/* Triangle Wave resources */
/*-------------------------------------------------------------------*/
BYTE ApuC3a, ApuC3b, ApuC3c, ApuC3d;
DWORD ApuC3Skip;
DWORD ApuC3Index;
BYTE ApuC3Atl;
DWORD ApuC3Llc; /* Linear Length Counter */
BYTE ApuC3WriteLatency;
BYTE ApuC3CounterStarted;
/*-------------------------------------------------------------------*/
/* Noise resources */
/*-------------------------------------------------------------------*/
BYTE ApuC4a, ApuC4b, ApuC4c, ApuC4d;
DWORD ApuC4Sr; /* Shift register */
DWORD ApuC4Fdc; /* Frequency divide counter */
DWORD ApuC4Skip;
DWORD ApuC4Index;
BYTE ApuC4Atl;
BYTE ApuC4EnvVol;
DWORD ApuC4EnvPhase;
/*-------------------------------------------------------------------*/
/* DPCM resources */
/*-------------------------------------------------------------------*/
BYTE ApuC5Reg[4];
BYTE ApuC5Enable;
BYTE ApuC5Looping;
BYTE ApuC5CurByte;
BYTE ApuC5DpcmValue;
int ApuC5Freq;
int ApuC5Phaseacc;
WORD ApuC5Address, ApuC5CacheAddr;
int ApuC5DmaLength, ApuC5CacheDmaLength;
/*-------------------------------------------------------------------*/
/* Wave Data */
/*-------------------------------------------------------------------*/
BYTE pulse_25[0x20] = {
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
};
BYTE pulse_50[0x20] = {
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
};
BYTE pulse_75[0x20] = {
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
};
BYTE pulse_87[0x20] = {
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x11, 0x11, 0x11, 0x11,
0x00, 0x00, 0x00, 0x00,
};
BYTE triangle_50[0x20] = {
0x00, 0x10, 0x20, 0x30,
0x40, 0x50, 0x60, 0x70,
0x80, 0x90, 0xa0, 0xb0,
0xc0, 0xd0, 0xe0, 0xf0,
0xff, 0xef, 0xdf, 0xcf,
0xbf, 0xaf, 0x9f, 0x8f,
0x7f, 0x6f, 0x5f, 0x4f,
0x3f, 0x2f, 0x1f, 0x0f,
};
BYTE *pulse_waves[4] = {
pulse_87, pulse_75, pulse_50, pulse_25,
};
/*-------------------------------------------------------------------*/
/* Active Time Left Data */
/*-------------------------------------------------------------------*/
BYTE ApuAtl[0x20] =
{
5, 127, 10, 1, 19, 2, 40, 3, 80, 4, 30, 5, 7, 6, 13, 7,
6, 8, 12, 9, 24, 10, 48, 11, 96, 12, 36, 13, 8, 14, 16, 15,
};
/*-------------------------------------------------------------------*/
/* Frequency Limit of Rectangle Channels */
/*-------------------------------------------------------------------*/
WORD ApuFreqLimit[8] =
{
0x3FF, 0x555, 0x666, 0x71C, 0x787, 0x7C1, 0x7E0, 0x7F0
};
/*-------------------------------------------------------------------*/
/* Noise Frequency Lookup Table */
/*-------------------------------------------------------------------*/
DWORD ApuNoiseFreq[ 16 ] =
{
4, 8, 16, 32, 64, 96, 128, 160,
202, 254, 380, 508, 762, 1016, 2034, 4068
};
/*-------------------------------------------------------------------*/
/* DMC Transfer Clocks Table */
/*-------------------------------------------------------------------*/
DWORD ApuDpcmCycles[ 16 ] =
{
428, 380, 340, 320, 286, 254, 226, 214,
190, 160, 142, 128, 106, 85, 72, 54
};
/*===================================================================*/
/* */
/* ApuRenderingWave1() : Rendering Rectangular Wave #1 */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Write registers of rectangular wave #1 */
/*-------------------------------------------------------------------*/
int ApuWriteWave1( int cycles, int event )
{
/* APU Reg Write Event */
while ( ( event < cur_event ) && ( ApuEventQueue[event].time < cycles ) )
{
if ( ( ApuEventQueue[event].type & APUET_MASK ) == APUET_C1 )
{
switch ( ApuEventQueue[event].type & 0x03 )
{
case 0:
ApuC1a = ApuEventQueue[event].data;
ApuC1Wave = pulse_waves[ ApuC1DutyCycle >> 6 ];
break;
case 1:
ApuC1b = ApuEventQueue[event].data;
break;
case 2:
ApuC1c = ApuEventQueue[event].data;
ApuC1Freq = ( ( ( (WORD)ApuC1d & 0x07 ) << 8 ) + ApuC1c );
ApuC1Atl = ApuAtl[ ( ApuC1d & 0xf8 ) >> 3 ];
if ( ApuC1Freq )
{
ApuC1Skip = ( ApuPulseMagic << 1 ) / ApuC1Freq;
} else {
ApuC1Skip = 0;
}
break;
case 3:
ApuC1d = ApuEventQueue[event].data;
ApuC1Freq = ( ( ( (WORD)ApuC1d & 0x07 ) << 8 ) + ApuC1c );
ApuC1Atl = ApuAtl[ ( ApuC1d & 0xf8 ) >> 3 ];
if ( ApuC1Freq )
{
ApuC1Skip = ( ApuPulseMagic << 1 ) / ApuC1Freq;
} else {
ApuC1Skip = 0;
}
break;
}
}
else if ( ApuEventQueue[event].type == APUET_W_CTRL )
{
ApuCtrlNew = ApuEventQueue[event].data;
if( !(ApuEventQueue[event].data&(1<<0)) ) {
ApuC1Atl = 0;
}
}
event++;
}
return event;
}
/*-------------------------------------------------------------------*/
/* Rendering rectangular wave #1 */
/*-------------------------------------------------------------------*/
void ApuRenderingWave1( void )
{
int cycles = 0;
int event = 0;
/* note: 41 CPU cycles occur between increments of i */
ApuCtrlNew = ApuCtrl;
for ( unsigned int i = 0; i < ApuSamplesPerSync; i++ )
{
/* Write registers */
cycles += ApuCyclesPerSample;
event = ApuWriteWave1( cycles, event );
/* Envelope decay at a rate of ( Envelope Delay + 1 ) / 240 secs */
ApuC1EnvPhase -= 4;
while ( ApuC1EnvPhase < 0 )
{
ApuC1EnvPhase += ApuC1EnvDelay;
if ( ApuC1Hold )
{
ApuC1EnvVol = ( ApuC1EnvVol + 1 ) & 0x0f;
}
else if ( ApuC1EnvVol < 0x0f )
{
ApuC1EnvVol++;
}
}
/*
* TODO: using a table of max frequencies is not technically
* clean, but it is fast and (or should be) accurate
*/
if ( ApuC1Freq < 8 || ( !ApuC1SweepIncDec && ApuC1Freq > ApuC1FreqLimit ) )
{
wave_buffers[0][i] = 0;
break;
}
/* Frequency sweeping at a rate of ( Sweep Delay + 1) / 120 secs */
if ( ApuC1SweepOn && ApuC1SweepShifts )
{
ApuC1SweepPhase -= 2; /* 120/60 */
while ( ApuC1SweepPhase < 0 )
{
ApuC1SweepPhase += ApuC1SweepDelay;
if ( ApuC1SweepIncDec ) /* ramp up */
{
/* Rectangular #1 */
ApuC1Freq += ~( ApuC1Freq >> ApuC1SweepShifts );
} else {
/* ramp down */
ApuC1Freq += ( ApuC1Freq >> ApuC1SweepShifts );
}
}
if ( ApuC1Freq ) {
ApuC1Skip = ( ApuPulseMagic << 1 ) / ApuC1Freq;
}
}
/* Wave Rendering */
if ( ( ApuCtrlNew & 0x01 ) && ( ApuC1Atl || ApuC1Hold ) )
{
ApuC1Index += ApuC1Skip;
ApuC1Index &= 0x1fffffff;
if ( ApuC1Env )
{
wave_buffers[0][i] = ApuC1Wave[ApuC1Index >> 24] * ( ApuC1Vol + ApuC1EnvVol );
} else {
wave_buffers[0][i] = ApuC1Wave[ApuC1Index >> 24] * ApuC1Vol;
}
} else {
wave_buffers[0][i] = 0;
}
}
if ( ApuC1Atl ) { ApuC1Atl--; }
}
/*===================================================================*/
/* */
/* ApuRenderingWave2() : Rendering Rectangular Wave #2 */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Write registers of rectangular wave #2 */
/*-------------------------------------------------------------------*/
int ApuWriteWave2( int cycles, int event )
{
/* APU Reg Write Event */
while ( ( event < cur_event ) && ( ApuEventQueue[event].time < cycles ) )
{
if ( ( ApuEventQueue[event].type & APUET_MASK ) == APUET_C2 )
{
switch ( ApuEventQueue[event].type & 0x03 )
{
case 0:
ApuC2a = ApuEventQueue[event].data;
ApuC2Wave = pulse_waves[ ApuC2DutyCycle >> 6 ];
break;
case 1:
ApuC2b = ApuEventQueue[event].data;
break;
case 2:
ApuC2c = ApuEventQueue[event].data;
ApuC2Freq = ( ( ( (WORD)ApuC2d & 0x07 ) << 8 ) + ApuC2c );
ApuC2Atl = ApuAtl[ ( ApuC2d & 0xf8 ) >> 3 ];
if ( ApuC2Freq )
{
ApuC2Skip = ( ApuPulseMagic << 1 ) / ApuC2Freq;
} else {
ApuC2Skip = 0;
}
break;
case 3:
ApuC2d = ApuEventQueue[event].data;
ApuC2Freq = ( ( ( (WORD)ApuC2d & 0x07 ) << 8 ) + ApuC2c );
ApuC2Atl = ApuAtl[ ( ApuC2d & 0xf8 ) >> 3 ];
if ( ApuC2Freq )
{
ApuC2Skip = ( ApuPulseMagic << 1 ) / ApuC2Freq;
} else {
ApuC2Skip = 0;
}
break;
}
}
else if ( ApuEventQueue[event].type == APUET_W_CTRL )
{
ApuCtrlNew = ApuEventQueue[event].data;
if( !(ApuEventQueue[event].data&(1<<1)) ) {
ApuC2Atl = 0;
}
}
event++;
}
return event;
}
/*-------------------------------------------------------------------*/
/* Rendering rectangular wave #2 */
/*-------------------------------------------------------------------*/
void ApuRenderingWave2( void )
{
int cycles = 0;
int event = 0;
/* note: 41 CPU cycles occur between increments of i */
ApuCtrlNew = ApuCtrl;
for ( unsigned int i = 0; i < ApuSamplesPerSync; i++ )
{
/* Write registers */
cycles += ApuCyclesPerSample;
event = ApuWriteWave2( cycles, event );
/* Envelope decay at a rate of ( Envelope Delay + 1 ) / 240 secs */
ApuC2EnvPhase -= 4;
while ( ApuC2EnvPhase < 0 )
{
ApuC2EnvPhase += ApuC2EnvDelay;
if ( ApuC2Hold )
{
ApuC2EnvVol = ( ApuC2EnvVol + 1 ) & 0x0f;
}
else if ( ApuC2EnvVol < 0x0f )
{
ApuC2EnvVol++;
}
}
/*
* TODO: using a table of max frequencies is not technically
* clean, but it is fast and (or should be) accurate
*/
if ( ApuC2Freq < 8 || ( !ApuC2SweepIncDec && ApuC2Freq > ApuC2FreqLimit ) )
{
wave_buffers[1][i] = 0;
break;
}
/* Frequency sweeping at a rate of ( Sweep Delay + 1) / 120 secs */
if ( ApuC2SweepOn && ApuC2SweepShifts )
{
ApuC2SweepPhase -= 2; /* 120/60 */
while ( ApuC2SweepPhase < 0)
{
ApuC2SweepPhase += ApuC2SweepDelay;
if ( ApuC2SweepIncDec ) /* ramp up */
{
/* Rectangular #2 */
ApuC2Freq -= ~( ApuC2Freq >> ApuC2SweepShifts );
} else {
/* ramp down */
ApuC2Freq += ( ApuC2Freq >> ApuC2SweepShifts );
}
}
if ( ApuC2Freq ) {
ApuC2Skip = ( ApuPulseMagic << 1 ) / ApuC2Freq;
}
}
/* Wave Rendering */
if ( ( ApuCtrlNew & 0x02 ) && ( ApuC2Atl || ApuC2Hold ) )
{
ApuC2Index += ApuC2Skip;
ApuC2Index &= 0x1fffffff;
if ( ApuC2Env )
{
wave_buffers[1][i] = ApuC2Wave[ApuC2Index >> 24] * ( ApuC2Vol + ApuC2EnvVol );
} else {
wave_buffers[1][i] = ApuC2Wave[ApuC2Index >> 24] * ApuC2Vol;
}
} else {
wave_buffers[1][i] = 0;
}
}
if ( ApuC2Atl ) { ApuC2Atl--; }
}
/*===================================================================*/
/* */
/* ApuRenderingWave3() : Rendering Triangle Wave */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Write registers of triangle wave #3 */
/*-------------------------------------------------------------------*/
int ApuWriteWave3( int cycles, int event )
{
/* APU Reg Write Event */
while (( event < cur_event ) && ( ApuEventQueue[event].time < cycles ) )
{
if ( ( ApuEventQueue[event].type & APUET_MASK ) == APUET_C3 )
{
switch ( ApuEventQueue[event].type & 3 )
{
case 0:
ApuC3a = ApuEventQueue[event].data;
ApuC3Llc = ApuC3LinearLength;
break;
case 1:
ApuC3b = ApuEventQueue[event].data;
break;
case 2:
ApuC3c = ApuEventQueue[event].data;
if ( ApuC3Freq )
{
ApuC3Skip = ApuTriangleMagic / ApuC3Freq;
} else {
ApuC3Skip = 0;
}
break;
case 3:
ApuC3d = ApuEventQueue[event].data;
ApuC3Atl = ApuC3LengthCounter;
if ( ApuC3Freq )
{
ApuC3Skip = ApuTriangleMagic / ApuC3Freq;
} else {
ApuC3Skip = 0;
}
}
} else if ( ApuEventQueue[event].type == APUET_W_CTRL ) {
ApuCtrlNew = ApuEventQueue[event].data;
if( !(ApuEventQueue[event].data&(1<<2)) ) {
ApuC3Atl = 0;
ApuC3Llc = 0;
}
}
event++;
}
return event;
}
/*-------------------------------------------------------------------*/
/* Rendering triangle wave #3 */
/*-------------------------------------------------------------------*/
void ApuRenderingWave3( void )
{
int cycles = 0;
int event = 0;
/* note: 41 CPU cycles occur between increments of i */
ApuCtrlNew = ApuCtrl;
for ( unsigned int i = 0; i < ApuSamplesPerSync; i++)
{
/* Write registers */
cycles += ApuCyclesPerSample;
event = ApuWriteWave3( cycles, event );
/* Cutting Min Frequency */
if ( ApuC3Freq < 8 )
{
wave_buffers[2][i] = 0;
break;
}
/* Counter Control */
if ( ApuC3CounterStarted )
{
if ( ApuC3Atl > 0 && !ApuC3Holdnote )
{
ApuC3Atl--;
}
if ( ApuC3Llc > 0 )
{
ApuC3Llc--;
}
} else if ( !ApuC3Holdnote && ApuC3WriteLatency > 0 ) {
if ( --ApuC3WriteLatency == 0 )
{
ApuC3CounterStarted = 0x01;
}
}
/* Wave Rendering */
if ( ( ApuCtrlNew & 0x04 ) && ( ( ApuC3Atl > 0 || ApuC3Holdnote ) && ApuC3Llc > 0 ) )
{
ApuC3Index += ApuC3Skip;
ApuC3Index &= 0x1fffffff;
wave_buffers[2][i] = triangle_50[ ApuC3Index >> 24 ];
} else {
wave_buffers[2][i] = 0;
}
}
}
/*===================================================================*/
/* */
/* ApuRenderingWave4() : Rendering Noise */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Write registers of noise channel #4 */
/*-------------------------------------------------------------------*/
int ApuWriteWave4( int cycles, int event )
{
/* APU Reg Write Event */
while ( (event < cur_event) && (ApuEventQueue[event].time < cycles) )
{
if ( ( ApuEventQueue[event].type & APUET_MASK ) == APUET_C4 )
{
switch (ApuEventQueue[event].type & 3) {
case 0:
ApuC4a = ApuEventQueue[event].data;
break;
case 1:
ApuC4b = ApuEventQueue[event].data;
break;
case 2:
ApuC4c = ApuEventQueue[event].data;
if ( ApuC4Small ) {
ApuC4Sr = 0x001f;
} else {
ApuC4Sr = 0x01ff;
}
/* Frequency */
if ( ApuC4Freq ) {
ApuC4Skip = ApuNoiseMagic / ApuC4Freq;
} else {
ApuC4Skip = 0;
}
ApuC4Atl = ApuC4LengthCounter;
break;
case 3:
ApuC4d = ApuEventQueue[event].data;
/* Frequency */
if ( ApuC4Freq ) {
ApuC4Skip = ApuNoiseMagic / ApuC4Freq;
} else {
ApuC4Skip = 0;
}
ApuC4Atl = ApuC4LengthCounter;
}
} else if (ApuEventQueue[event].type == APUET_W_CTRL) {
ApuCtrlNew = ApuEventQueue[event].data;
if( !(ApuEventQueue[event].data&(1<<3)) ) {
ApuC4Atl = 0;
}
}
event++;
}
return event;
}
/*-------------------------------------------------------------------*/
/* Rendering noise channel #4 */
/*-------------------------------------------------------------------*/
void ApuRenderingWave4(void)
{
int cycles = 0;
int event = 0;
ApuCtrlNew = ApuCtrl;
for ( unsigned int i = 0; i < ApuSamplesPerSync; i++ )
{
/* Write registers */
cycles += ApuCyclesPerSample;
event = ApuWriteWave4( cycles, event );
/* Envelope decay at a rate of ( Envelope Delay + 1 ) / 240 secs */
ApuC4EnvPhase -= 4;
while ( ApuC4EnvPhase < 0 )
{
ApuC4EnvPhase += ApuC4EnvDelay;
if ( ApuC4Hold )
{
ApuC4EnvVol = ( ApuC4EnvVol + 1 ) & 0x0f;
}
else if ( ApuC4EnvVol < 0x0f )
{
ApuC4EnvVol++;
}
}
/* Wave Rendering */
if ( ApuCtrlNew & 0x08 )
{
ApuC4Index += ApuC4Skip;
if ( ApuC4Index > 0x1fffffff )
{
if ( ApuC4Small ) /* FIXME: may be wrong */
{
ApuC4Sr |= ((!(ApuC4Sr & 1)) ^ (!(ApuC4Sr & 4))) << 5;
} else {
ApuC4Sr |= ((!(ApuC4Sr & 1)) ^ (!(ApuC4Sr & 16))) << 9;
}
ApuC4Sr >>= 1;
}
ApuC4Index &= 0x1fffffff;
if ( ApuC4Atl && ( ApuC4Sr & 1 ) )
{
if ( !ApuC4Env )
{
wave_buffers[3][i] = ApuC4Vol;
} else {
wave_buffers[3][i] = ApuC4EnvVol ^ 0x0f;
}
} else {
wave_buffers[3][i] = 0;
}
} else {
wave_buffers[3][i] = 0;
}
}
if ( ApuC4Atl && !ApuC4Hold )
{
ApuC4Atl--;
}
}
/*===================================================================*/
/* */
/* ApuRenderingWave5() : Rendering DPCM channel #5 */
/* */
/*===================================================================*/
/*-------------------------------------------------------------------*/
/* Write registers of DPCM channel #5 */
/*-------------------------------------------------------------------*/
int ApuWriteWave5( int cycles, int event )
{
/* APU Reg Write Event */
while ( (event < cur_event) && (ApuEventQueue[event].time < cycles) )
{
if ( ( ApuEventQueue[event].type & APUET_MASK ) == APUET_C5 )
{
ApuC5Reg[ ApuEventQueue[event].type & 3 ] = ApuEventQueue[event].data;
switch (ApuEventQueue[event].type & 3) {
case 0:
ApuC5Freq = ApuDpcmCycles[ ( ApuEventQueue[event].data & 0x0F ) ] << 16;
ApuC5Looping = ApuEventQueue[event].data & 0x40;
break;
case 1:
ApuC5DpcmValue = ( ApuEventQueue[event].data & 0x7F ) >> 1;
break;
case 2:
ApuC5CacheAddr = 0xC000 + (WORD)( ApuEventQueue[event].data << 6 );
break;
case 3:
ApuC5CacheDmaLength = ( ( ApuEventQueue[event].data << 4 ) + 1 ) << 3;
break;
}
} else if (ApuEventQueue[event].type == APUET_W_CTRL) {
ApuCtrlNew = ApuEventQueue[event].data;
if( !(ApuEventQueue[event].data&(1<<4)) ) {
ApuC5Enable = 0;
ApuC5DmaLength = 0;
} else {
ApuC5Enable = 0xFF;
if( !ApuC5DmaLength ) {
ApuC5Address = ApuC5CacheAddr;
ApuC5DmaLength = ApuC5CacheDmaLength;
}
}
}
event++;
}
return event;
}
/*-------------------------------------------------------------------*/
/* Rendering DPCM channel #5 */
/*-------------------------------------------------------------------*/
void ApuRenderingWave5(void)
{
int cycles = 0;
int event = 0;
ApuCtrlNew = ApuCtrl;
for ( unsigned int i = 0; i < ApuSamplesPerSync; i++ )
{
/* Write registers */
cycles += ApuCyclesPerSample;
event = ApuWriteWave5( cycles, event );
if( ApuC5DmaLength ) {
ApuC5Phaseacc -= ApuCycleRate;
while( ApuC5Phaseacc < 0 ) {
ApuC5Phaseacc += ApuC5Freq;
if( !( ApuC5DmaLength & 7 ) ) {
ApuC5CurByte = K6502_Read( ApuC5Address );
if( 0xFFFF == ApuC5Address )
ApuC5Address = 0x8000;
else
ApuC5Address++;
}
if( !(--ApuC5DmaLength) ) {
if( ApuC5Looping ) {
ApuC5Address = ApuC5CacheAddr;
ApuC5DmaLength = ApuC5CacheDmaLength;
} else {
ApuC5Enable = 0;
break;
}
}
// positive delta
if( ApuC5CurByte & ( 1 << ((ApuC5DmaLength&7)^7)) ) {
if( ApuC5DpcmValue < 0x3F )
ApuC5DpcmValue += 1;
} else {
// negative delta
if( ApuC5DpcmValue > 1 )
ApuC5DpcmValue -= 1;
}
}
}
/* Wave Rendering */
if ( ApuCtrlNew & 0x10 ) {
wave_buffers[4][i] = ( ApuC5Reg[1]&0x01 ) + ( ApuC5DpcmValue << 1 );
}
}
}
/*===================================================================*/
/* */
/* InfoNES_pApuVsync() : Callback Function per Vsync */
/* */
/*===================================================================*/
void InfoNES_pAPUVsync(void)
{
ApuRenderingWave1();
ApuRenderingWave2();
ApuRenderingWave3();
ApuRenderingWave4();
ApuRenderingWave5();
ApuCtrl = ApuCtrlNew;
InfoNES_SoundOutput(ApuSamplesPerSync,
wave_buffers[0], wave_buffers[1], wave_buffers[2],
wave_buffers[3], wave_buffers[4]);
entertime = g_wPassedClocks;
cur_event = 0;
}
/*===================================================================*/
/* */
/* InfoNES_pApuInit() : Initialize pApu */
/* */
/*===================================================================*/
void InfoNES_pAPUInit(void)
{
/* Sound Hardware Init */
InfoNES_SoundInit();
ApuQuality = pAPU_QUALITY - 1; // 1: 22050, 2: 44100 [samples/sec]
ApuPulseMagic = ApuQual[ ApuQuality ].pulse_magic;
ApuTriangleMagic = ApuQual[ ApuQuality ].triangle_magic;
ApuNoiseMagic = ApuQual[ ApuQuality ].noise_magic;
ApuSamplesPerSync = ApuQual[ ApuQuality ].samples_per_sync;
ApuCyclesPerSample = ApuQual[ ApuQuality ].cycles_per_sample;
ApuSampleRate = ApuQual[ ApuQuality ].sample_rate;