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module-exp.c
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/*
SegaCD MOD support code by Chilly Willy, based on
Ami-PlayMOD_V1_0_20090417.c (c) 2009 Massimiliano Scarano [email protected]
which had the following restriction:
If you use the source code, you should always mention me as the original author.
*/
/* Includes ==================================================================================== */
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "hw_md.h"
#include "cdfh.h"
#include "pcm.h"
#include "module.h"
/* Defines ===================================================================================== */
/* define if handle 6 or 8 channel mods */
#define HANDLE_EXTRA_CHANNELS
/* define if handle panning */
//#define HANDLE_PANNING
/* define if want a little cross-talk between sides (only if no panning) */
//#define CROSS_TALK 3
/* Function prototypes ========================================================================= */
/*
Called by sound sub-system at 50 Hz (or BPM * 2 / 5)
returns 1 if not playing
*/
uint16_t PlayMOD(Mod_t* Mod_p);
static void UpdateNote(Mod_t* Mod_p, uint8_t* Data_p);
static void UpdateEffect(Mod_t* Mod_p);
static void DoVibrato(Mod_t* Mod_p, uint8_t Channel);
static void DoTremolo(Mod_t* Mod_p, uint8_t Channel);
static void DoPorta(Mod_t* Mod_p, uint8_t Channel);
/*
System specific functions
*/
static Mod_t* SetMOD(Mod_t* Mod_p);
static void SetSample(uint16_t Channel, uint8_t Sample, uint32_t SampleOffset);
static void SetFrequency(uint16_t Channel, uint32_t Period);
static void SetVolume(uint16_t Channel, uint32_t Volume, int32_t Pan);
/* Global variables ============================================================================ */
/*
From Amiga ProTracker playroutine source code
- Amiga PERIODS represent delay times before fetching the next sample (in units of system clock ticks @ ~3.5 MHz)
*/
static const uint16_t AmigaPeriodsTable[ MOD_FINE_TUNE_VALUES ][ MOD_NUMBER_OF_NOTES ] =
{
/* ; Tuning 0, Normal */
{ 856,808,762,720,678,640,604,570,538,508,480,453, /* ; C-1 to B-1 */
428,404,381,360,339,320,302,285,269,254,240,226, /* ; C-2 to B-2 */
214,202,190,180,170,160,151,143,135,127,120,113 }, /* ; C-3 to B-3 */
/* ; Tuning 1 */
{ 850,802,757,715,674,637,601,567,535,505,477,450, /* ; same as above */
425,401,379,357,337,318,300,284,268,253,239,225, /* ; but with */
213,201,189,179,169,159,150,142,134,126,119,113 }, /* ; finetune +1 */
/* ; Tuning 2 */
{ 844,796,752,709,670,632,597,563,532,502,474,447, /* ; etc, */
422,398,376,355,335,316,298,282,266,251,237,224, /* ; finetune +2 */
211,199,188,177,167,158,149,141,133,125,118,112 },
/* ; Tuning 3 */
{ 838,791,746,704,665,628,592,559,528,498,470,444,
419,395,373,352,332,314,296,280,264,249,235,222,
209,198,187,176,166,157,148,140,132,125,118,111 },
/* ; Tuning 4 */
{ 832,785,741,699,660,623,588,555,524,495,467,441,
416,392,370,350,330,312,294,278,262,247,233,220,
208,196,185,175,165,156,147,139,131,124,117,110 },
/* ; Tuning 5 */
{ 826,779,736,694,655,619,584,551,520,491,463,437,
413,390,368,347,328,309,292,276,260,245,232,219,
206,195,184,174,164,155,146,138,130,123,116,109 },
/* ; Tuning 6 */
{ 820,774,730,689,651,614,580,547,516,487,460,434,
410,387,365,345,325,307,290,274,258,244,230,217,
205,193,183,172,163,154,145,137,129,122,115,109 },
/* ; Tuning 7 */
{ 814,768,725,684,646,610,575,543,513,484,457,431,
407,384,363,342,323,305,288,272,256,242,228,216,
204,192,181,171,161,152,144,136,128,121,114,108 },
/* ; Tuning -8 */
{ 907,856,808,762,720,678,640,604,570,538,508,480,
453,428,404,381,360,339,320,302,285,269,254,240,
226,214,202,190,180,170,160,151,143,135,127,120 },
/* ; Tuning -7 */
{ 900,850,802,757,715,675,636,601,567,535,505,477,
450,425,401,379,357,337,318,300,284,268,253,238,
225,212,200,189,179,169,159,150,142,134,126,119 },
/* ; Tuning -6 */
{ 894,844,796,752,709,670,632,597,563,532,502,474,
447,422,398,376,355,335,316,298,282,266,251,237,
223,211,199,188,177,167,158,149,141,133,125,118 },
/* ; Tuning -5 */
{ 887,838,791,746,704,665,628,592,559,528,498,470,
444,419,395,373,352,332,314,296,280,264,249,235,
222,209,198,187,176,166,157,148,140,132,125,118 },
/* ; Tuning -4 */
{ 881,832,785,741,699,660,623,588,555,524,494,467,
441,416,392,370,350,330,312,294,278,262,247,233,
220,208,196,185,175,165,156,147,139,131,123,117 },
/* ; Tuning -3 */
{ 875,826,779,736,694,655,619,584,551,520,491,463,
437,413,390,368,347,328,309,292,276,260,245,232,
219,206,195,184,174,164,155,146,138,130,123,116 },
/* ; Tuning -2 */
{ 868,820,774,730,689,651,614,580,547,516,487,460,
434,410,387,365,345,325,307,290,274,258,244,230,
217,205,193,183,172,163,154,145,137,129,122,115 },
/* ; Tuning -1 */
{ 862,814,768,725,684,646,610,575,543,513,484,457,
431,407,384,363,342,323,305,288,272,256,242,228,
216,203,192,181,171,161,152,144,136,128,121,114 }
};
/*
From Amiga ProTracker playroutine source code
for Vibrato and Tremolo
*/
static const uint8_t SineTable[ 32 ] =
{
0, 24, 49, 74, 97, 120, 141, 161,
180, 197, 212, 224, 235, 244, 250, 253,
255, 253, 250, 244, 235, 224, 212, 197,
180, 161, 141, 120, 97, 74, 49, 24
};
/*
Global volume for playing Modules
*/
static uint8_t gVolume = 16;
static Mod_t *gMod = NULL;
typedef struct voice {
uint8_t pending;
uint8_t vol;
uint8_t pan;
uint8_t start;
uint16_t offset;
uint16_t loop;
uint16_t period;
} voice_t;
#define PENDING_START 1
#define PENDING_STOP 2
#define PENDING_VOL 4
#define PENDING_PER 8
voice_t voices[8];
static void callback(void);
/* Module handler ============================================================================== */
/*
Initialize Module structure
*/
uint8_t InitMOD(CDFileHandle_t *File_p, Mod_t* Mod_p)
{
const uint8_t ModSignature[ MOD_SIGNATURE_LENGTH ] = {'M', '.', 'K', '.'};
const uint8_t AltSignature[ MOD_SIGNATURE_LENGTH ] = {'4', 'C', 'H', 'N'};
#ifdef HANDLE_EXTRA_CHANNELS
const uint8_t Mod6Signature[ MOD_SIGNATURE_LENGTH ] = {'6', 'C', 'H', 'N'};
const uint8_t Mod8Signature[ MOD_SIGNATURE_LENGTH ] = {'8', 'C', 'H', 'N'};
#endif
uint8_t Cnt, Iw, Ix, Iy;
uint8_t Sample;
uint8_t Order;
uint32_t Soffset, Iz;
uint8_t *Data_p = (uint8_t *)0x0C0000; /* use word ram for MOD processing */
memset( Mod_p, 0, sizeof(Mod_t) ); /* main data structure set to 0 */
/* load MOD header from CD */
if (File_p->Read(File_p, Data_p, 1084) != 1084)
return 1; /* couldn't load MOD header */
/* check signature */
for ( Cnt = 0; Cnt < MOD_SIGNATURE_LENGTH; Cnt++ )
{
if ( ModSignature[ Cnt ] != Data_p[ Cnt + MOD_SIGNATURE_OFFSET ] )
{
break; /* no match */
}
}
if ( MOD_SIGNATURE_LENGTH == Cnt )
{
Mod_p->NumberOfChannels = 4; /* we have a 4 channel mod */
}
if ( !Mod_p->NumberOfChannels )
{
/* check for alternate 4 channel signature */
for ( Cnt = 0; Cnt < MOD_SIGNATURE_LENGTH; Cnt++ )
{
if ( AltSignature[ Cnt ] != Data_p[ Cnt + MOD_SIGNATURE_OFFSET ] )
{
break; /* no match */
}
}
if ( MOD_SIGNATURE_LENGTH == Cnt )
{
Mod_p->NumberOfChannels = 4; /* we have a 4 channel mod */
}
}
#ifdef HANDLE_EXTRA_CHANNELS
if ( !Mod_p->NumberOfChannels )
{
/* check for 6 channel signature */
for ( Cnt = 0; Cnt < MOD_SIGNATURE_LENGTH; Cnt++ )
{
if ( Mod6Signature[ Cnt ] != Data_p[ Cnt + MOD_SIGNATURE_OFFSET ] )
{
break; /* no match */
}
}
if ( MOD_SIGNATURE_LENGTH == Cnt )
{
Mod_p->NumberOfChannels = 6; /* we have a 6 channel mod */
}
}
if ( !Mod_p->NumberOfChannels )
{
/* check for 8 channel signature */
for ( Cnt = 0; Cnt < MOD_SIGNATURE_LENGTH; Cnt++ )
{
if ( Mod8Signature[ Cnt ] != Data_p[ Cnt + MOD_SIGNATURE_OFFSET ] )
{
break; /* no match */
}
}
if ( MOD_SIGNATURE_LENGTH == Cnt )
{
Mod_p->NumberOfChannels = 8; /* we have a 8 channel mod */
}
}
#endif
if ( !Mod_p->NumberOfChannels )
{
return 2; /* not recognized, or not supported number of channels */
}
for ( Sample = 0; Sample < MOD_NUMBER_OF_SAMPLES; Sample++ )
{
uint8_t Byte1, Byte2;
Byte1 = Data_p[ 20 + 22 + 30 * Sample ];
Byte2 = Data_p[ 20 + 23 + 30 * Sample ];
Mod_p->Inst[ Sample ].SampleLength = ( (Byte1 * 0x0100) + Byte2 ) * 2;
Mod_p->Inst[ Sample ].FineTune = Data_p[ 20 + 24 + 30 * Sample ];
Mod_p->Inst[ Sample ].Volume = Data_p[ 20 + 25 + 30 * Sample ];
Byte1 = Data_p[ 20 + 26 + 30 * Sample ];
Byte2 = Data_p[ 20 + 27 + 30 * Sample ];
Mod_p->Inst[ Sample ].LoopStart = ( (Byte1 * 0x0100) + Byte2 ) * 2;
Byte1 = Data_p[ 20 + 28 + 30 * Sample ];
Byte2 = Data_p[ 20 + 29 + 30 * Sample ];
Mod_p->Inst[ Sample ].LoopLength = ( (Byte1 * 0x0100) + Byte2 ) * 2;
} /* for Sample */
Mod_p->SongLength = Data_p[ 950 ]; /* this is the number of orders in a song */
/* get NumberOfPatterns */
Mod_p->NumberOfPatterns = 0;
for ( Order = 0; Order < MOD_NUMBER_OF_ORDERS; Order++ )
{
Mod_p->Orders[ Order ] = Data_p[ 952 + Order ];
if ( Mod_p->Orders[ Order ] > Mod_p->NumberOfPatterns )
{
Mod_p->NumberOfPatterns = Mod_p->Orders[ Order ];
}
} /* for Order */
Mod_p->NumberOfPatterns += 1; /* [ 0 ; Mod_p->NumberOfPatterns ] */
if (Mod_p->NumberOfPatterns * MOD_ROWS_PER_CHANNEL * Mod_p->NumberOfChannels * 4 > 131072)
return 3; /* pattern data too big */
/* allocate memory for patterns */
Mod_p->PatternsBuff_p = (uint8_t*)malloc(Mod_p->NumberOfPatterns * MOD_ROWS_PER_CHANNEL * Mod_p->NumberOfChannels * 6);
if (!Mod_p->PatternsBuff_p)
return 4; /* couldn't allocate pattern buffer */
/* Pattern data starts at offset 1084 - read and decode into pattern buffer */
if ( File_p->Read(File_p, Data_p, Mod_p->NumberOfPatterns * MOD_ROWS_PER_CHANNEL * Mod_p->NumberOfChannels * 4) !=
(Mod_p->NumberOfPatterns * MOD_ROWS_PER_CHANNEL * Mod_p->NumberOfChannels * 4) )
{
free(Mod_p->PatternsBuff_p);
return 5; /* couldn't read pattern data */
}
Iz = 0;
for ( Ix = 0; Ix < Mod_p->NumberOfPatterns; Ix++ )
{
for ( Iy = 0; Iy < MOD_ROWS_PER_CHANNEL; Iy++ )
{
uint32_t *Div_p = (uint32_t *)&Data_p[(Ix * MOD_ROWS_PER_CHANNEL * Mod_p->NumberOfChannels * 4) + (Iy * Mod_p->NumberOfChannels * 4)];
uint8_t Channel;
for ( Channel = 0; Channel < Mod_p->NumberOfChannels; Channel++ )
{
uint32_t division;
uint8_t SampleNumber;
uint8_t EffectNumber;
uint8_t EffectParameter;
uint8_t NoteColumn;
uint16_t PeriodFrequency;
/* Amiga-fied mess ;-) */
division = Div_p[ Channel ];
/*
+-------------------------------------+
| Byte 0 Byte 1 Byte 2 Byte 3 |
|-------------------------------------|
|aaaaBBBB CCCCCCCCC DDDDeeee FFFFFFFFF|
+-------------------------------------+
aaaaDDDD = sample number
BBBBCCCCCCCC = sample period value
eeee = effect number
FFFFFFFF = effect parameters
*/
SampleNumber = ((division >> 24) & 0x00F0) | ((division >> 12) & 0x000F);
PeriodFrequency = ((division >> 16) & 0x0FFF);
EffectNumber = (division >> 8) & 0x000F;
EffectParameter = division & 0x00FF;
NoteColumn = 0xFF; // note doesn't exist
/* look up table here */
for ( Cnt = 0; Cnt < MOD_NUMBER_OF_NOTES; Cnt++ )
{
if ( AmigaPeriodsTable[ 0 ][ Cnt ] == Mod_p->Notes[ Channel ].PeriodFrequency )
{
NoteColumn = Cnt; // note exists
break;
}
} /* for Cnt */
Mod_p->PatternsBuff_p[Iz + 0] = SampleNumber;
Mod_p->PatternsBuff_p[Iz + 1] = EffectNumber;
Mod_p->PatternsBuff_p[Iz + 2] = EffectParameter;
Mod_p->PatternsBuff_p[Iz + 3] = NoteColumn;
Mod_p->PatternsBuff_p[Iz + 4] = PeriodFrequency >> 8;
Mod_p->PatternsBuff_p[Iz + 5] = PeriodFrequency & 0x00FF;
Iz += 6;
}
}
}
/* fit samples to sound ram */
Iz = 0;
do
{
if (Iz > MOD_PCM_RAM)
{
// find largest sample and cut it in half
Iy = 0;
Iz = Mod_p->Inst[ 0 ].SampleLength >> Mod_p->Inst[ 0 ].Factor;
for ( Sample = 1; Sample < MOD_NUMBER_OF_SAMPLES; Sample++ )
if ( (Mod_p->Inst[ Sample ].SampleLength >> Mod_p->Inst[ Sample ].Factor) > Iz )
{
Iy = Sample;
Iz = Mod_p->Inst[ Sample ].SampleLength >> Mod_p->Inst[ Sample ].Factor;
}
Mod_p->Inst[ Iy ].Factor++;
}
Iz = 0;
/* find total size of samples given factors */
for ( Sample = 0; Sample < MOD_NUMBER_OF_SAMPLES; Sample++ )
Iz += ((Mod_p->Inst[ Sample ].SampleLength >> Mod_p->Inst[ Sample ].Factor) + 32 + 255) & ~255;
} while (Iz > MOD_PCM_RAM);
/* upload samples to sound ram */
pcm_reset();
for ( Sample = 0, Iw = 0; Sample < MOD_NUMBER_OF_SAMPLES; Sample++ )
{
if ( Mod_p->Inst[ Sample ].SampleLength > 0 )
{
/* load sample data */
if (Mod_p->Inst[ Sample ].Factor)
{
/* resample data */
Iy = 0;
Soffset = Mod_p->Inst[ Sample ].SampleLength;
while (Soffset > 0)
{
for (Ix = 0, Iz = 0; (Ix < (1 << Mod_p->Inst[ Sample ].Factor)) && Soffset; Ix++, Soffset--)
Iz += File_p->Get(File_p);
Data_p[Iy++] = Iz >> Mod_p->Inst[ Sample ].Factor;
}
}
else
File_p->Read(File_p, Data_p, Mod_p->Inst[ Sample ].SampleLength);
Mod_p->Inst[ Sample ].SampleHandle = Iw;
pcm_load_samples(Iw, (int8_t*)Data_p, Mod_p->Inst[ Sample ].SampleLength >> Mod_p->Inst[ Sample ].Factor);
Iw = pcm_next_block(Iw, Mod_p->Inst[ Sample ].SampleLength >> Mod_p->Inst[ Sample ].Factor);
}
else
{
Mod_p->Inst[ Sample ].SampleHandle = 0xFF;
}
} /* for Sample */
memset(voices, 0, sizeof(voices));
Mod_p->Speed = 6; /* default speed */
Mod_p->Tick = 6; /* force immediate processing */
Mod_p->Order = 0; /* default order */
Mod_p->Row = 0; /* default row */
Mod_p->BeatsPerMinute = 125;
Mod_p->IsPlaying = 0;
return 0; /* no errors */
}
/*
Cleanup MOD - stop playing and release voices
*/
void ExitMOD(Mod_t* Mod_p)
{
if (Mod_p)
{
if (Mod_p->IsPlaying)
StopMOD(Mod_p);
/* quiet sound channels */
pcm_reset();
free(Mod_p->PatternsBuff_p);
/* make sure struct cannot be reused without init */
memset(Mod_p, 0, sizeof(Mod_t));
}
}
/*
Start playing Module
loop = bool = TRUE = loop forever, = FALSE = play once
returns the previously set Module, if any
*/
Mod_t* StartMOD(Mod_t* Mod_p, uint8_t loop)
{
if (Mod_p)
{
pcm_start_timer(&callback);
Mod_p->IsPlaying = loop ? 0x81 : 1;
return SetMOD(Mod_p);
}
return (Mod_t*)NULL;
}
/*
Pause/resume Module
pause = bool = TRUE = pause, = FALSE = resume
*/
void PauseMOD(Mod_t* Mod_p, uint8_t pause)
{
uint8_t i;
if (Mod_p)
{
if ( pause )
{
asm("move.w #0x2700,%sr");
Mod_p->IsPlaying &= 0xFE;
for (i=0; i<Mod_p->NumberOfChannels; i++)
{
pcm_set_ctrl(0x40 + i);
pcm_set_env(0);
}
pcm_set_ctrl(0xC0);
asm("move.w #0x2000,%sr");
}
else
{
asm("move.w #0x2700,%sr");
Mod_p->IsPlaying |= 1;
for (i=0; i<Mod_p->NumberOfChannels; i++)
voices[i].pending |= PENDING_VOL;
asm("move.w #0x2000,%sr");
}
}
}
/*
Stop playing Module
*/
void StopMOD(Mod_t* Mod_p)
{
if (Mod_p)
{
pcm_stop_timer();
Mod_p->IsPlaying = 0;
SetMOD(0);
}
}
/*
Wait for Module to play through once
*/
void WaitMOD(Mod_t* Mod_p)
{
do
{
if (!Mod_p->IsPlaying)
break;
if (Mod_p->IsPlaying & 0x80)
if (!Mod_p->Row && !Mod_p->Order)
break;
} while (1);
}
/*
Check Module play status
returns 0 if done playing
*/
uint8_t CheckMOD(Mod_t* Mod_p)
{
if (Mod_p->IsPlaying & 0x80)
return (!Mod_p->Row && !Mod_p->Order) ? 0 : 1;
return Mod_p->IsPlaying;
}
/*
Set global volume
vol = 0 = off, = 16 = max
returns the previous volume setting
*/
uint8_t VolumeMOD(uint8_t vol)
{
uint8_t prev = gVolume;
gVolume = vol > 16 ? 16: vol;
return prev;
}
/*
+----------------------------------------------------------------------------+
| === Playing the MOD === |
+----------------------------------------------------------------------------+
timer function, it contains the player logic, it has to be as fast as possible
The SPEED of a song is the base on how your mod is played.
Each row of a pattern is updated every SPEED number of clock ticks.
*/
uint16_t PlayMOD(Mod_t* Mod_p)
{
Mod_p->Pattern = Mod_p->Orders[ Mod_p->Order ]; /* pattern for current order */
Mod_p->Tick++;
if (Mod_p->Tick >= Mod_p->Speed)
{
if ( !Mod_p->PatternDelay ) /* if there is no pattern delay */
{
UpdateNote( Mod_p, &Mod_p->PatternsBuff_p[ Mod_p->Pattern * MOD_ROWS_PER_CHANNEL * Mod_p->NumberOfChannels + Mod_p->Row * Mod_p->NumberOfChannels * 6 ] ); /* process 1 note for every channel */
Mod_p->Row += 1; /* increment row */
}
else
{
Mod_p->PatternDelay--; /* else decrement pattern delay */
}
Mod_p->Tick = 0;
if ( Mod_p->Row >= MOD_ROWS_PER_CHANNEL )
{
/* process next pattern */
Mod_p->Order++;
if (Mod_p->Order >= Mod_p->SongLength)
{
/* finished playing the mod */
if (Mod_p->IsPlaying & 0x80)
{
/* loop - reset to defaults */
Mod_p->Speed = 6;
Mod_p->Tick = 6; /* force immediate processing */
Mod_p->Order = 0;
Mod_p->Row = 0;
Mod_p->BeatsPerMinute = 125;
}
else
{
Mod_p->IsPlaying = 0; /* song done playing */
}
}
else
{
Mod_p->Pattern = Mod_p->Orders[ Mod_p->Order ];
Mod_p->Row = 0;
}
}
}
else
{
Mod_p->Row -= 1; /* decrement row */
/* update the tick based effects */
UpdateEffect( Mod_p );
Mod_p->Row += 1; /* increment row */
}
return Mod_p->IsPlaying ? 0 : 1;
}
/*
process division - 1 note for every channel
*/
static void UpdateNote(Mod_t* Mod_p, uint8_t* Data_p)
{
uint8_t Channel; /* counter */
uint8_t EParX; /* Effect Parameter X */
uint8_t EParY; /* Effect Parameter Y */
uint8_t JumpFlag, BreakFlag; /* boolean flags for effects JUMP_TO_PATTERN and PATTERN_BREAK on the same row */
JumpFlag = FALSE;
BreakFlag = FALSE;
for ( Channel = 0; Channel < Mod_p->NumberOfChannels; Channel++ )
{
Mod_p->Notes[ Channel ].SampleNumber = Data_p[0];
Mod_p->Notes[ Channel ].EffectNumber = Data_p[1];
Mod_p->Notes[ Channel ].EffectParameter = Data_p[2];
Mod_p->Notes[ Channel ].NoteExists = (Data_p[3] == 0xFF) ? FALSE : TRUE;
Mod_p->Notes[ Channel ].PeriodFrequencyCol = (Data_p[3] == 0xFF) ? 0 : Data_p[3];
Mod_p->Notes[ Channel ].PeriodFrequency = (Data_p[4] << 8) + Data_p[5];
EParX = Mod_p->Notes[ Channel ].EffectParameter >> 4;
EParY = Mod_p->Notes[ Channel ].EffectParameter & 0xF;
Mod_p->Channels[ Channel ].SampleOffset = 2;
if ( Mod_p->Notes[ Channel ].SampleNumber > 0 )
{
Mod_p->Channels[ Channel ].LastInstrument = Mod_p->Notes[ Channel ].SampleNumber - 1;
if ( !( ( Mod_p->Notes[ Channel ].EffectNumber == EFFECT_EXTENDED_EFFECTS ) && ( EParX == EFFECT_DELAY_NOTE ) ) )
{
Mod_p->Channels[ Channel ].Volume = Mod_p->Inst[ Mod_p->Notes[ Channel ].SampleNumber - 1 ].Volume; /* default volume of sample */
}
}
if ( Mod_p->Notes[ Channel ].NoteExists == TRUE )
{
if ( ( Mod_p->Channels[ Channel ].WaveformControl & 0x0F ) < 4 )
{
Mod_p->Channels[ Channel ].VibratoPosition = 0;
}
if ( ( Mod_p->Channels[ Channel ].WaveformControl >> 4 ) < 4 )
{
Mod_p->Channels[ Channel ].TremoloPosition = 0;
}
/* if not a porta effect, then set the channels frequency to the looked up amiga value + or - any finetune */
if ( (Mod_p->Notes[ Channel ].EffectNumber != EFFECT_PORTA_TO_NOTE) &&
(Mod_p->Notes[ Channel ].EffectNumber != EFFECT_PORTA_PLUS_VOL_SLIDE) )
{
uint8_t FineTune;
FineTune = Mod_p->Inst[ Mod_p->Channels[ Channel ].LastInstrument ].FineTune;
Mod_p->Channels[ Channel ].PeriodFrequency = AmigaPeriodsTable[ FineTune ][ Mod_p->Notes[ Channel ].PeriodFrequencyCol ];
} /* if */
//Mod_p->Channels[ Channel ].SampleOffset = 2;
} /* if */
/* skip effects ? */
if ( !( ( Mod_p->Notes[ Channel ].EffectNumber == 0 ) && ( Mod_p->Notes[ Channel ].EffectParameter == 0 ) ) )
{
/* process the non tick based effects also grab parameters for tick based effects */
switch ( Mod_p->Notes[ Channel ].EffectNumber )
{
case EFFECT_ARPEGGIO: /* not processed on tick 0 */
case EFFECT_PORTA_UP: /* not processed on tick 0 */
case EFFECT_PORTA_DOWN: /* not processed on tick 0 */
break;
case EFFECT_PORTA_TO_NOTE: /* reviewed OK */
if ( Mod_p->Notes[ Channel ].EffectParameter > 0 )
{
Mod_p->Channels[ Channel ].PortaSpeed = Mod_p->Notes[ Channel ].EffectParameter;
}
/* no break statement here */
case EFFECT_PORTA_PLUS_VOL_SLIDE: /* reviewed OK */
if ( Mod_p->Notes[ Channel ].NoteExists == TRUE )
{
Mod_p->Channels[ Channel ].PortaTo = Mod_p->Notes[ Channel ].PeriodFrequency;
}
break;
case EFFECT_VIBRATO: /* reviewed OK */
if ( EParX > 0 )
{
Mod_p->Channels[ Channel ].VibratoSpeed = EParX;
}
if ( EParY > 0 )
{
Mod_p->Channels[ Channel ].VibratoDepth = EParY;
}
break;
case EFFECT_VIBRATO_PLUS_VOL_SLIDE: /* not processed on tick 0 */
break;
case EFFECT_TREMOLO: /* reviewed OK */
if ( EParX > 0 )
{
Mod_p->Channels[ Channel ].TremoloSpeed = EParX;
}
if ( EParY > 0 )
{
Mod_p->Channels[ Channel ].TremoloDepth = EParY;
}
break;
case EFFECT_PAN: /* reviewed OK */ /* not a ProTracker effect */
Mod_p->Channels[ Channel ].PanValue = Mod_p->Notes[ Channel ].EffectParameter;
break;
case EFFECT_SAMPLE_OFFSET: /* reviewed OK */
if ( Mod_p->Notes[ Channel ].EffectParameter > 0 )
{
Mod_p->Channels[ Channel ].SampleOffset = ( Mod_p->Notes[ Channel ].EffectParameter << 8 );
}
if ( Mod_p->Channels[ Channel ].SampleOffset > Mod_p->Inst[ Mod_p->Channels[ Channel ].LastInstrument ].SampleLength )
{
Mod_p->Channels[ Channel ].SampleOffset = Mod_p->Inst[ Mod_p->Channels[ Channel ].LastInstrument ].SampleLength;
/* this will result in silence */
}
break;
case EFFECT_VOLUME_SLIDE: /* not processed on tick 0 */
break;
case EFFECT_JUMP_TO_PATTERN: /* reviewed OK */
Mod_p->Order = Mod_p->Notes[ Channel ].EffectParameter;
Mod_p->Row = -1;
if ( Mod_p->Order >= Mod_p->SongLength )
{
Mod_p->Order = 0;
}
// if ( Mod_p->Order == 0 )
// {
/* loop the mod */
if (!(Mod_p->IsPlaying & 0x80))
{
Mod_p->IsPlaying = 0; /* song done playing */
return;
}
// }
JumpFlag = TRUE;
break;
case EFFECT_SET_VOLUME: /* reviewed OK */
Mod_p->Channels[ Channel ].Volume = Mod_p->Notes[ Channel ].EffectParameter;
if ( Mod_p->Channels[ Channel ].Volume < 0 )
{
Mod_p->Channels[ Channel ].Volume = 0;
}
if ( Mod_p->Channels[ Channel ].Volume > 64 )
{
Mod_p->Channels[ Channel ].Volume = 64;
}
break;
case EFFECT_PATTERN_BREAK: /* reviewed OK */
Mod_p->Row = ( EParX * 10 ) + EParY; /* get row number */
if ( Mod_p->Row == 0 )
{
Mod_p->Row = -1;
}
else if ( Mod_p->Row >= MOD_ROWS_PER_CHANNEL )
{
Mod_p->Row = -1;
}
else
{
Mod_p->Row -= 1;
}
if ( ! JumpFlag && ! BreakFlag )
{
Mod_p->Order++;
if ( Mod_p->Order >= Mod_p->SongLength )
{
Mod_p->Order = 0;
/* repeat the mod */
if (!(Mod_p->IsPlaying & 0x80))
{
Mod_p->IsPlaying = 0; /* song done playing */
return;
}
}
}
BreakFlag = TRUE;
break;
case EFFECT_EXTENDED_EFFECTS:
switch (EParX)
{
case EFFECT_FINE_PORTA_UP: /* reviewed OK */
Mod_p->Channels[ Channel ].PeriodFrequency -= EParY;
break;
case EFFECT_FINE_PORTA_DOWN: /* reviewed OK */
Mod_p->Channels[ Channel ].PeriodFrequency += EParY;
break;
case EFFECT_GLISSANDO_CONTROL: /* not implemented not even in fmoddoc2 */
break;
case EFFECT_SET_VIBRATO_WAVEFORM: /* reviewed OK */
Mod_p->Channels[ Channel ].WaveformControl &= 0xF0;
Mod_p->Channels[ Channel ].WaveformControl |= EParY;
break;
case EFFECT_SET_FINETUNE: /* reviewed OK */
Mod_p->Inst[ Mod_p->Channels[ Channel ].LastInstrument ].FineTune = EParY;
break;
case EFFECT_PATTERN_LOOP: /* reviewed OK */
if ( EParY == 0 )
{
Mod_p->Channels[ Channel ].PatLoopRow = Mod_p->Row;
}
else
{
if ( ! Mod_p->Channels[ Channel ].PatLoopNo )
{
Mod_p->Channels[ Channel ].PatLoopNo = EParY;
}
else
{
Mod_p->Channels[ Channel ].PatLoopNo--;
}
if ( Mod_p->Channels[ Channel ].PatLoopNo )
{
Mod_p->Row = Mod_p->Channels[ Channel ].PatLoopRow - 1;
}
}
break;
case EFFECT_SET_TREMOLO_WAVEFORM: /* reviewed OK */
Mod_p->Channels[ Channel ].WaveformControl &= 0x0F;
Mod_p->Channels[ Channel ].WaveformControl |= (EParY << 4);
break;
case EFFECT_POSITION_PANNING: /* cw - fixed */
Mod_p->Channels[ Channel ].PanValue = (EParY << 4) | EParY;
break;
case EFFECT_RETRIG_NOTE: /* not processed on tick 0 */
break;
case EFFECT_FINE_VOLUME_SLIDE_UP: /* reviewed OK */
Mod_p->Channels[ Channel ].Volume += EParY;
if ( Mod_p->Channels[ Channel ].Volume > 64 )
{
Mod_p->Channels[ Channel ].Volume = 64;
}
break;
case EFFECT_FINE_VOLUME_SLIDE_DOWN: /* reviewed OK */
Mod_p->Channels[ Channel ].Volume -= EParY;
if ( Mod_p->Channels[ Channel ].Volume < 0 )
{
Mod_p->Channels[ Channel ].Volume = 0;
}
break;
case EFFECT_CUT_NOTE: /* not processed on tick 0 */
break;
case EFFECT_DELAY_NOTE: /* not processed on tick 0 */ /* reviewed OK */
continue; /* process next note */
break;
case EFFECT_PATTERN_DELAY: /* reviewed OK */
Mod_p->PatternDelay = EParY;
break;
default:
break;
}
break;
case EFFECT_SET_SPEED: /* cw - update for bpm */
if ( Mod_p->Notes[ Channel ].EffectParameter < 0x20 )
{
if ( Mod_p->Notes[ Channel ].EffectParameter )
{
Mod_p->Speed = Mod_p->Notes[ Channel ].EffectParameter;
}
}
else
{
Mod_p->BeatsPerMinute = Mod_p->Notes[ Channel ].EffectParameter;
}
break;
default:
/* effect not defined */
break;
} /* switch */
} /* if */
if ( Mod_p->Notes[ Channel ].EffectNumber != EFFECT_SET_TREMOLO_WAVEFORM )
{
/* set volume */
SetVolume( Channel, Mod_p->Channels[ Channel ].Volume, Mod_p->Channels[ Channel ].PanValue );
}
if ( Mod_p->Channels[ Channel ].PeriodFrequency > 0 )
{
/* set frequency */
SetFrequency( Channel, Mod_p->Channels[ Channel ].PeriodFrequency );
}
if ( Mod_p->Notes[ Channel ].NoteExists == TRUE )
{
if ( ( Mod_p->Notes[ Channel ].EffectNumber != EFFECT_PORTA_TO_NOTE ) &&
( Mod_p->Notes[ Channel ].EffectNumber != EFFECT_PORTA_PLUS_VOL_SLIDE ) )
{
/* set sample */
SetSample( Channel, Mod_p->Channels[ Channel ].LastInstrument, Mod_p->Channels[ Channel ].SampleOffset );
}
} /* if */
} /* for Channel */
return;
}
/*
update tick based effects
*/
static void UpdateEffect(Mod_t* Mod_p)
{
uint8_t Channel; /* counter */
uint8_t EParX; /* Effect Parameter X */
uint8_t EParY; /* Effect Parameter Y */
uint8_t Tick = Mod_p->Tick; /* current music tick */
for ( Channel = 0; Channel < Mod_p->NumberOfChannels; Channel++ )
{
EParX = Mod_p->Notes[ Channel ].EffectParameter >> 4;
EParY = Mod_p->Notes[ Channel ].EffectParameter & 0xF;
switch ( Mod_p->Notes[ Channel ].EffectNumber )
{
case EFFECT_ARPEGGIO: /* effect used in chip tunes */ /* reviewed OK */
if ( Mod_p->Notes[ Channel ].EffectParameter > 0 )
{
switch ( Tick % 3 )
{
case 0:
SetFrequency( Channel, Mod_p->Channels[ Channel ].PeriodFrequency );
break;
case 1:
SetFrequency( Channel, Mod_p->Channels[ Channel ].PeriodFrequency + EParX );
break;
case 2:
SetFrequency( Channel, Mod_p->Channels[ Channel ].PeriodFrequency + EParY );