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GBA.c
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GBA.c
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//AdvancePlay 0.2 FroggestSpirit
#include "GBA.h"
uint8_t read_byte(){
return music[filePos++];
}
uint16_t read_short(){
return music[filePos++] + (music[filePos++] << 8);
}
uint32_t read_long(){
return music[filePos++] + (music[filePos++] << 8) + (music[filePos++] << 16) + (music[filePos++] << 24);
}
bool loadSong(int id){ //loads a song
int idi = id;
songLoc = read_long_from((idi * 8) + 4);
filePos = songLoc;
songOffset = read_long();
printf("Song Location:%X\n", songLoc);
printf("Song Offset:%X\n", songOffset);
numTracks = read_long() & 0xFFFF;
printf("Number of Tracks:%X\n", numTracks);
tablePointer = read_long_from(songLoc + 8);
printf("Table at:%X\n", tablePointer);
return true;
}
unsigned long read_long_from(unsigned long addr){ //returns the 4 -byte address at addr
filePos = addr;
return read_long();
}
bool minit(int songID, int sRate, bool inf){
running = false;
sampleRate = sRate;
filePos = 0;
//Set the output values properly
delayHit = false;
tempoFill = 0;
usedTracks = 0xFFFF;
seqTempo = 120;
seqVol = 0x7F;
fadeVol = 0;
maxLoops = 2;
infLoop = inf;
mixer[0] = 0;
mixer[1] = 0;
soundOut[0] = 0;
soundOut[1] = 0;
gb_hram[0x25] = 0xFF;
gb_hram[0x26] = 0x80;
PU4Table = lfsr15;
PU4TableLen = 0x7FFF;
PU1Table = PU1;
PU2Table = PU1;
musicSize = sizeof(music);
printf("File Size:%d\n", musicSize);
for(int i = 0; i < 16; i++){
PSG[0x00 + i] = i < 2 ? 0xBF : 0x40;
PSG[0x10 + i] = i < 4 ? 0xBF : 0x40;
PSG[0x20 + i] = i < 8 ? 0xBF : 0x40;
PSG[0x30 + i] = i < 12 ? 0xBF : 0x40;
}
//Read container header
filePos = 0x00;
totalSongs = numSongs = read_long();
printf("Number of Songs: %X\n", numSongs);
for (int i = 0; i < 16; i++) {
timesLooped[i] = maxLoops;
chPointer[i] = 0;
slotChannel[i] = 0;
slotFree[i] = 0;
slotNote[i] = 0;
slotNoteVel[i] = 0;
slotNoteLen[i] = 0;
chDelay[i] = 0;
chInstrument[i] = 0;
chPan[i] = 0x40;
chPanL[i] = 0x40;
chPanR[i] = 0x40;
chVol[i] = 0x7F;
chTranspose[i] = 0;
chPitchBendCur[i] = 0;
chPitchBend[i] = 0x40;
chPitchBendRange[i] = 2;
chSweepPitch[i] = 0;
chPriority[i] = 0;
chPolyMono[i] = 0;
chTie[i] = 0;
chPort[i] = 0;
chPortOn[i] = 0;
chPortTime[i] = 0;
chModDelay[i] = 0;
chModDepth[i] = 0;
chModSpeed[i] = 0;
chModType[i] = 0;
chModRange[i] = 0;
chAttack[i] = 0;
chDecay[i] = 0;
chSustain[i] = 0;
chRelease[i] = 0;
chLoopTimes[i] = 0;
chLoopOffset[i] = 0;
chReturnOffset[i] = 0;
chInCall[i] = false;
chActive[i] = false;
slotSamplePointer[i] = 0;
tempNibble = 0;
slotMidiFreq[i] = 0;
slotPitch[i] = 0;
slotPitchFill[i] = 0;
samplePitchFill[i] = 0;
chInstrument[i] = 0;
sampleDone[i] = true;
}
seqIndex = songID;
loadSong(seqIndex);
//read seq header
filePos = songLoc + 0x0c;
for(int i = 0; i < numTracks; i++){
chPointer[i] = read_long() - songOffset;
chActive[i] = true;
timesLooped[i] = 0;
printf("Track Pointer %X: %X\n", i, chPointer[i]);
}
//read bank header
filePos = tablePointer;
for(int i = 0; i < 128; i++){
//keyPointer[i] = filePos;
filePos += 12;
}
running = true;
return true;
}
bool get_instrument_data(unsigned char inst, unsigned char note){
//read bank header
filePos = tablePointer + (inst * 12);
keyPointer[curSlot] = filePos;
keyIsSplit[curSlot] = 0;
switch(read_long() & 0xFF){
case 0x00:
case 0x08:
case 0x03:
case 0x0B: //Sample / Wav
instPointer[curSlot] = read_long();
break;
case 0x01:
case 0x02:
case 0x04:
case 0x09:
case 0x0A:
case 0x0C: //PSG
break;
case 0x40: //Key Split
keyIsSplit[curSlot] = 1;
temp32 = read_long();
keySplitPointer = read_long();
if(keySplitPointer < musicSize && temp32 < musicSize){
filePos = keySplitPointer + note;
keyPointer[curSlot] = temp32 + (read_byte() * 12);
filePos = keyPointer[curSlot] + 4;
instPointer[curSlot] = read_long();
}
break;
case 0x80: //Every Key Split
keyIsSplit[curSlot] = 1;
temp32 = read_long();
if(temp32 < musicSize){
//get sub instruments
keyPointer[curSlot] = temp32 + (note * 12);
filePos = keyPointer[curSlot] + 4;
instPointer[curSlot] = read_long();
}
break;
}
return true;
}
bool stop(){
running = false;
return true;
}
void gb_write(unsigned char addr, unsigned char val){
if((addr >= 0x10) && (addr <= 0x2F)){
switch(addr){
case 0x10://ch1 sweep
gb_hram[addr] = val;
gb_ch1SweepDir = (val & 0x08) >> 3;
gb_ch1SweepCounter = gb_ch1SweepCounterI = (val & 0x70) >> 4;
gb_ch1SweepShift = (val & 0x07);
break;
case 0x11://ch1 duty/length
gb_hram[addr] = val;
switch(val & 0xC0){
case 0x00:
PU1Table = PU0;
break;
case 0x40:
PU1Table = PU1;
break;
case 0x80:
PU1Table = PU2;
break;
case 0xC0:
PU1Table = PU3;
break;
}
gb_ch1Len = gb_ch1LenI = val & 0x3F;
break;
case 0x16://ch2 duty/length
gb_hram[addr] = val;
switch(val & 0xC0){
case 0x00:
PU2Table = PU0;
break;
case 0x40:
PU2Table = PU1;
break;
case 0x80:
PU2Table = PU2;
break;
case 0xC0:
PU2Table = PU3;
break;
}
gb_ch2Len = gb_ch2LenI = val & 0x3F;
break;
case 0x1B://ch3 length
gb_hram[addr] = val;
gb_ch3Len = gb_ch3LenI = val;
break;
case 0x20://ch4 length
gb_hram[addr] = val;
gb_ch3Len = gb_ch3LenI = val & 0x3F;
break;
case 0x12://ch1 envelope
gb_hram[addr] = val;
gb_ch1Vol = gb_ch1VolI = (val & 0xF0) >> 4;
gb_ch1EnvDir = (val & 0x08) >> 3;
gb_ch1EnvCounter = gb_ch1EnvCounterI = (val & 0x07);
break;
case 0x17://ch2 envelope
gb_hram[addr] = val;
gb_ch2Vol = gb_ch2VolI = (val & 0xF0) >> 4;
gb_ch2EnvDir = (val & 0x08) >> 3;
gb_ch2EnvCounter = gb_ch2EnvCounterI = (val & 0x07);
break;
case 0x1C://ch3 Volume (on hardware, this bitshifts the wav samples. The method here is quicker, sounds better, but is less accurate compared to hardware)
gb_hram[addr] = val;
switch((val & 0x60)){
case 0x00://mute
gb_ch3Vol = gb_ch3VolI = 0;
break;
case 0x20://full
gb_ch3Vol = gb_ch3VolI = 16;
break;
case 0x40://half
gb_ch3Vol = gb_ch3VolI = 8;
break;
case 0x60://quarter
gb_ch3Vol = gb_ch3VolI = 4;
break;
}
break;
case 0x21://ch4 envelope
gb_hram[addr] = val;
gb_ch4Vol = gb_ch4VolI = (val & 0xF0) >> 4;
gb_ch4EnvDir = (val & 0x08) >> 3;
gb_ch4EnvCounter = gb_ch4EnvCounterI = (val & 0x07);
break;
case 0x14://ch1 retrigger sound
gb_hram[addr] = val;
if(val & 0x80){
gb_ch1Vol = gb_ch1VolI;
gb_ch1SweepCounter = gb_ch1SweepCounterI;
gb_ch1EnvCounter = gb_ch1EnvCounterI;
}
if(val & 0x40){
gb_ch1LenOn = 1;
}else{
gb_ch1LenOn = 0;
}
gb_ch1Len = gb_ch1LenI;
break;
case 0x19://ch2 retrigger sound
gb_hram[addr] = val;
if(val & 0x80){
gb_ch2Vol = gb_ch2VolI;
gb_ch2EnvCounter = gb_ch2EnvCounterI;
}
if(val & 0x40){
gb_ch2LenOn = 1;
}else{
gb_ch2LenOn = 0;
}
gb_ch2Len = gb_ch2LenI;
break;
case 0x1E://ch3 retrigger sound
gb_hram[addr] = val;
if(val & 0x80){
gb_ch3Vol = gb_ch3VolI;
}
if(val & 0x40){
gb_ch3LenOn = 1;
}else{
gb_ch3LenOn = 0;
}
gb_ch3Len = gb_ch3LenI;
break;
case 0x22://ch4 noise type
gb_hram[addr] = val;
switch(val & 0x08){
case 0x00:
PU4Table = lfsr15;
PU4TableLen = 0x7FFF;
break;
case 0x08:
PU4Table = lfsr7;
PU4TableLen = 0x7F;
break;
}
break;
case 0x23://ch4 retrigger sound
gb_hram[addr] = val;
if(val & 0x80){
gb_ch4Vol = gb_ch4VolI;
gb_ch4EnvCounter = gb_ch4EnvCounterI;
}
if(val & 0x40){
gb_ch4LenOn = 1;
}else{
gb_ch4LenOn = 0;
}
gb_ch4Len = gb_ch4LenI;
break;
default:
gb_hram[addr] = val;
break;
}
}
if((addr >= 0x30) && (addr <= 0x3F)){
gb_WAVRAM[((addr & 0x0F) << 1)] = ((val & 0xF0) << 1) - 0xF0;
gb_WAVRAM[((addr & 0x0F) << 1) + 1] = ((val & 0x0F) << 5) - 0xF0;
}
}
void mloop(float* out){
seqFrame = false;
static int c = 0;
static int gb_audio_step = 0;
static bool gb_swp_update = 0;
static bool gb_env_update = 0;
//sample processing
if (!running) return 0; //Nothing to do here!
if(paused) return 0;
c += 60;
gb_audio_step += 256; //updates 256hz
if(gb_audio_step >= sampleRate){ //GB audio update
gb_audio_step -= sampleRate;
if(gb_ch1Len){
if(--gb_ch1Len == 0 && gb_ch1LenOn){
gb_ch1Vol = gb_ch1EnvCounter = 0;
}
}
if(gb_ch2Len){
if(--gb_ch2Len == 0 && gb_ch2LenOn){
gb_ch2Vol = gb_ch2EnvCounter = 0;
}
}
if(gb_ch3Len){
if(--gb_ch3Len == 0 && gb_ch3LenOn){
gb_ch3Vol = 0;
}
}
if(gb_ch4Len){
if(--gb_ch4Len == 0 && gb_ch4LenOn){
gb_ch4Vol = gb_ch4EnvCounter = 0;
}
}
gb_swp_update ^= 1;
if(gb_swp_update == 1){
if(gb_ch1SweepCounterI && gb_ch1SweepShift){
if(--gb_ch1SweepCounter == 0){
gb_ch1Freq = gb_hram[0x13] + ((gb_hram[0x14] & 7) << 8);
if(gb_ch1SweepDir){
gb_ch1Freq -= gb_ch1Freq >> gb_ch1SweepShift;
if(gb_ch1Freq & 0xF800) gb_ch1Freq = 0;
}else{
gb_ch1Freq += gb_ch1Freq >> gb_ch1SweepShift;
if(gb_ch1Freq & 0xF800){
gb_ch1Freq = 0;
gb_ch1EnvCounter = 0;
gb_ch1Vol = 0;
}
}
gb_hram[0x13] = gb_ch1Freq & 0xFF;
gb_hram[0x14] &= 0xF8;
gb_hram[0x14] += (gb_ch1Freq >> 8) & 0x07;
gb_ch1SweepCounter = gb_ch1SweepCounterI;
}
}
gb_env_update ^= 1;
if(gb_env_update == 1){
if(gb_ch1EnvCounter){
if(--gb_ch1EnvCounter == 0){
if(gb_ch1Vol && !gb_ch1EnvDir){
gb_ch1Vol--;
gb_ch1EnvCounter = gb_ch1EnvCounterI;
}else if(gb_ch1Vol < 0x0F && gb_ch1EnvDir){
gb_ch1Vol++;
gb_ch1EnvCounter = gb_ch1EnvCounterI;
}
}
}
if(gb_ch2EnvCounter){
if(--gb_ch2EnvCounter == 0){
if(gb_ch2Vol && !gb_ch2EnvDir){
gb_ch2Vol--;
gb_ch2EnvCounter = gb_ch2EnvCounterI;
}else if(gb_ch2Vol < 0x0F && gb_ch2EnvDir){
gb_ch2Vol++;
gb_ch2EnvCounter = gb_ch2EnvCounterI;
}
}
}
if(gb_ch4EnvCounter){
if(--gb_ch4EnvCounter == 0){
if(gb_ch4Vol && !gb_ch4EnvDir){
gb_ch4Vol--;
gb_ch4EnvCounter = gb_ch4EnvCounterI;
}else if(gb_ch4Vol < 0x0F && gb_ch4EnvDir){
gb_ch4Vol++;
gb_ch4EnvCounter = gb_ch4EnvCounterI;
}
}
}
}
}
}
if(c >= sampleRate){ //player update
c -= sampleRate;
seqFrame = true;
if(fadeVol < 0){
fadeVol--;
if(fadeVol <= - 723) running = false;
if (!running) return 0;
}
tempoFill += seqTempo;
while(tempoFill >= 150){
tempoFill -= 150;
for(int i = 0; i < 16; i++){
if(chActive[i]){
if(chDelay[i] == 0){
delayHit = false;
while(!delayHit){
filePos = chPointer[i];
if(music[filePos] < 0x80){
temp[0] = lastCommand[i];
repeated = 1;
}else{
temp[0] = read_byte();
repeated = 0;
}
//printf("Command:%X at:%X\n", temp[0], filePos);
switch(temp[0]){
case 0xB1: //End of Track
chActive[i] = false;
delayHit = true;
timesLooped[i] = maxLoops;
loopi = 0;
while(timesLooped[loopi] >= maxLoops && loopi < 16) loopi++;
if(loopi == 16) fadeVol = - 722;
break;
case 0xB2: //Jump
chPointer[i] = read_long() - songOffset;
if(timesLooped[i] < maxLoops)timesLooped[i]++;
loopi = 0;
while(timesLooped[loopi] >= maxLoops && loopi < 16) loopi++;
if(loopi == 16 && fadeVol == 0 && !infLoop) fadeVol--;
break;
case 0xB3: //Call
chReturnOffset[i] = chPointer[i] + 5;
chInCall[i] = true;
chPointer[i] = read_long() - songOffset;
break;
case 0xB4: //Return
if(chInCall[i]){
chPointer[i] = chReturnOffset[i];
chInCall[i] = false;
}else{
chPointer[i]++;
}
break;
case 0xBA: //Priority
read_byte();
chPointer[i] += 2;
break;
case 0xBB: //Tempo
seqTempo = (read_byte() << 1);
chPointer[i] += 2;
break;
case 0xBC: //Transpose
chTranspose[i] = read_byte();
chPointer[i] += 2;
break;
case 0xBD: //Instrument Change
chInstrument[i] = read_byte() & 0x7F;
chPointer[i] += 2;
lastCommand[i] = 0xBD;
break;
case 0xBE: //Volume
chVol[i] = read_byte();
//printf("VOL:%X:%X\n", i, chVol[i]);
chPointer[i] += 2;
lastCommand[i] = 0xBE;
break;
case 0xBF: //Pan
chPan[i] = read_byte();
chPanL[i] = chPan[i];
chPanR[i] = 127 - chPan[i];
chPointer[i] += 2;
lastCommand[i] = 0xBF;
break;
case 0xC0: //Pitch Bend
chPitchBend[i] = read_byte();
chPointer[i] += 2;
chPitchBendCur[i] = ((chPitchBend[i] - 0x40) * (chPitchBendRange[i] << 1));
//if(chPitchBend[i] > 0x40) chPitchBendCur[i] = ((chPitchBend[i] - 0x40) * chPitchBendRange[i]);
//if(chPitchBend[i] < 0x40) chPitchBendCur[i] = (chPitchBend[i] * chPitchBendRange[i]);
lastCommand[i] = 0xC0;
break;
case 0xC1: //Pitch Bend Range
chPitchBendRange[i] = read_byte();
chPointer[i] += 2;
chPitchBendCur[i] = ((chPitchBend[i] - 0x40) * (chPitchBendRange[i] << 1));
//if(chPitchBend[i] > 128) chPitchBendCur[i] = ((chPitchBend[i] - 256) * chPitchBendRange[i]);
//if(chPitchBend[i] <= 128) chPitchBendCur[i] = (chPitchBend[i] * chPitchBendRange[i]);
lastCommand[i] = 0xC1;
break;
case 0xC2: //LFO Speed
chPointer[i] += 2;
break;
case 0xC3: //LFO delay
chPointer[i] += 2;
break;
case 0xC4: //LFO depth
chPointer[i] += 2;
lastCommand[i] = 0xC4;
break;
case 0xC5: //LFO type
chPointer[i] += 2;
break;
case 0xC8: //detune
chPointer[i] += 2;
lastCommand[i] = 0xC8;
break;
case 0xCD: //psudo echo
chPointer[i] += 3;
lastCommand[i] = 0xCD;
break;
case 0xCE: //Note Off
//printf("OFF:%X:%X\n", i, chInstrument[i]);
if(music[filePos] < 0x80){ //note argument provided?
temp[0] = read_byte();
chPointer[i]++;
}else{
temp[0] = lastNote[i];
}
lastNote[i] = temp[0];
tempNote = temp[0];
if(music[filePos] < 0x80){ //velocity argument provided?
temp[0] = read_byte();
chPointer[i]++;
}else{
temp[0] = lastVel[i];
}
lastVel[i] = temp[0];
tempVel = temp[0];
for(int slot = 0; slot < 16; slot++){
if(slotChannel[slot] == i){ //find slots used by this channel
if(slotNote[slot] == tempNote){
slotFree[slot] = 0;
slotADSRState[slot] = 3;
slotADSRVol[slot] = slotSustain[slot];
if((slotInstType[slot] & 7) == 1){
gb_write(0x12, 0);
gb_write(0x13, 0);
gb_write(0x14, 0x80);
}else if((slotInstType[slot] & 7) == 2){
gb_write(0x17, 0);
gb_write(0x18, 0);
gb_write(0x19, 0x80);
}else if((slotInstType[slot] & 7) == 3){
gb_write(0x1A, 0);
}else if((slotInstType[slot] & 7) == 4){
gb_write(0x21, 0);
gb_write(0x23, 0);
}
}
}
}
lastCommand[i] = 0xCE;
chPointer[i]++;
break;
default:
if(temp[0] >= 0xCF){ //Note on
lastCommand[i] = temp[0];
//printf("ON:%X Command:%X\n", i, temp[0]);
curSlot = 0xFF;
for(int slot = 0; slot < 16; slot++){
if(slotFree[slot] == 0){ //check for free slots
curSlot = slot;
slot = 16;
}
}
if(curSlot == 0xFF){
for(int slot = 0; slot < 16; slot++){
if(slotFree[slot] == 1){ //if free slots are unavailable, check for slot in release state
curSlot = slot;
slot = 16;
}
}
}
if(curSlot == 0xFF){
for(int slot = 0; slot < 16; slot++){
if(slotFree[slot] == 2){ //if free slots are unavailable, pick a slot
curSlot = slot;
slot = 16;
}
}
}
if(curSlot < 0xFF){
//curSlot = i; //remove once track priority is implemented
slotChannel[curSlot] = i;
slotFree[curSlot] = 2;
slotNoteLen[curSlot] = 0;
if(temp[0] >= 0xD0){
slotNoteLen[curSlot] = (DELTA_TIME[temp[0] - 0xD0]);
}
if(music[filePos] < 0x80){ //note argument provided?
temp[0] = read_byte();
chPointer[i]++;
}else{
temp[0] = lastNote[i];
}
lastNote[i] = temp[0];
slotNote[curSlot] = temp[0];
slotMidiFreq[curSlot] = ((slotNote[curSlot] + chTranspose[i]) << 7);
if(music[filePos] < 0x80){ //velocity argument provided?
temp[0] = read_byte();
chPointer[i]++;
}else{
temp[0] = lastVel[i];
}
lastVel[i] = temp[0];
slotNoteVel[curSlot] = temp[0];
if(slotNoteLen[curSlot] > 0){ //Optional delta - time
if(music[filePos] < 0x80){
slotNoteLen[curSlot] += read_byte();
chPointer[i]++;
}
}
tempFilePos = filePos;
get_instrument_data(chInstrument[i], slotNote[curSlot]);
filePos = tempFilePos;
slotSamplePointer[curSlot] = instPointer[curSlot];
slotInstType[curSlot] = music[keyPointer[curSlot]];
slotKeyPointer[curSlot] = keyPointer[curSlot];
//if(chPitchBendCur[i] != 0) printf("%X Pitch:%X\n", i, chPitchBendCur[i]);
if(slotInstType[curSlot] == 0 || slotInstType[curSlot] == 8){ //Sample
if(slotInstType[curSlot] == 0){
slotPitchFill[curSlot] = slotPitch[curSlot] = FREQ_TABLE[music[slotKeyPointer[curSlot] + 1] << 7];
}else{
slotPitch[curSlot] = FREQ_TABLE[slotMidiFreq[curSlot]];
slotPitchFill[curSlot] = 0;
}
sampleDone[curSlot] = false;
samplePos[curSlot] = 0;
sampleOutput[curSlot] = 0;
slotADSRState[curSlot] = 0;
slotADSRVol[curSlot] = 0;
slotAttack[curSlot] = music[slotKeyPointer[curSlot] + 8];
slotDecay[curSlot] = music[slotKeyPointer[curSlot] + 9];
slotSustain[curSlot] = music[slotKeyPointer[curSlot] + 10];
slotRelease[curSlot] = music[slotKeyPointer[curSlot] + 11];
slotPanL[curSlot] = chPanL[i];
slotPanR[curSlot] = chPanR[i];
samplePitchFill[curSlot] = sampleRate;
if(music[slotSamplePointer[curSlot] + 3] == 0x40){
sampleLoops[curSlot] = 1;
sampleLoop[curSlot] = (float)(read_long_from(slotSamplePointer[curSlot] + 8));
}else{
sampleLoops[curSlot] = 0;
sampleLoop[curSlot] = 0.0f;
}
samplePitch[curSlot] = read_long_from(slotSamplePointer[curSlot] + 4);
samplePitch[curSlot] /= 1024;
sampleEnd[curSlot] = (float)(read_long_from(slotSamplePointer[curSlot] + 12));
sampleLoopLength[curSlot] = sampleEnd[curSlot] - sampleLoop[curSlot];
slotSamplePointer[curSlot] += 16;
}else if((slotInstType[curSlot] & 7) < 3){ //PSG
slotAttack[curSlot] = music[slotKeyPointer[curSlot] + 8];
slotDecay[curSlot] = music[slotKeyPointer[curSlot] + 9];
slotSustain[curSlot] = music[slotKeyPointer[curSlot] + 10];
slotRelease[curSlot] = music[slotKeyPointer[curSlot] + 11];
//printf("N : %X %X %X %X\n", music[slotKeyPointer[curSlot] + 8], music[slotKeyPointer[curSlot] + 9], music[slotKeyPointer[curSlot] + 10], music[slotKeyPointer[curSlot] + 11]);
sampleDone[curSlot] = true;
slotFree[curSlot] = true;
temp[0] = slotNote[curSlot];
temp[1] = 0;
unsigned int tempVolR = (slotNoteVel[curSlot] * 0x80 * chPanR[i]) >> 0xE;
unsigned int tempVolL = (slotNoteVel[curSlot] * 0x7F * chPanL[i]) >> 0xE;
if(tempVolR > 0xFF) tempVolR = 0xFF;
if(tempVolL > 0xFF) tempVolL = 0xFF;
unsigned int envGoal = (tempVolL + tempVolR) >> 4;
if(envGoal > 0x0F) envGoal = 0x0F;
unsigned char susGoal = (envGoal * ((unsigned int)slotSustain[curSlot]) + 15) >> 4;
if(music[slotKeyPointer[curSlot] + 2] > 0) temp[1] = 0x40;
if((slotInstType[curSlot] & 7) == 1){
//printf("P1 : %X %X %X %X : %X %X : %X\n", chVol[curSlot], slotNoteVel[curSlot], chPanL[i], chPanR[i], tempVolL, tempVolR, susGoal);
gb_write(0x10, music[slotKeyPointer[curSlot] + 3]);
gb_write(0x11, (music[slotKeyPointer[curSlot] + 4] << 6) + music[slotKeyPointer[curSlot] + 2]);
gb_write(0x12, susGoal << 4);
gb_write(0x13, (freqTableGB[temp[0]] & 0xFF));
gb_write(0x14, 0x80 | temp[1] | (freqTableGB[temp[0]] >> 8));
}else{
//printf("P2 : %X %X %X %X : %X %X : %X\n", chVol[curSlot], slotNoteVel[curSlot], chPanL[i], chPanR[i], tempVolL, tempVolR, susGoal);
gb_write(0x16, (music[slotKeyPointer[curSlot] + 4] << 6) + music[slotKeyPointer[curSlot] + 2]);
gb_write(0x17, susGoal << 4);
gb_write(0x18, (freqTableGB[temp[0]] & 0xFF));
gb_write(0x19, 0x80 | temp[1] | (freqTableGB[temp[0]] >> 8));
}
/*
slotPitchFill[curSlot] = slotPitch[curSlot] = FREQ_TABLE[(music[slotKeyPointer[curSlot] + 1] + 12) << 7];
sampleDone[curSlot] = false;
samplePos[curSlot] = 0;
sampleOutput[curSlot] = 0;
slotADSRState[curSlot] = 0;
slotADSRVol[curSlot] = 0;
slotAttack[curSlot] = (7 - music[slotKeyPointer[curSlot] + 8]) * 0x24;
if(slotAttack[curSlot] == 0) slotAttack[curSlot] = 1;
slotDecay[curSlot] = (7 - music[slotKeyPointer[curSlot] + 9]) * 0x24;
if(slotDecay[curSlot] == 0) slotDecay[curSlot] = 1;
slotSustain[curSlot] = (music[slotKeyPointer[curSlot] + 10]) * 0x11;
slotRelease[curSlot] = (7 - music[slotKeyPointer[curSlot] + 11]) * 0x24;
if(slotRelease[curSlot] == 0) slotRelease[curSlot] = 1;
slotPanL[curSlot] = chPanL[i];
slotPanR[curSlot] = chPanR[i];
samplePitchFill[curSlot] = sampleRate;
sampleLoops[curSlot] = 1;
sampleLoop[curSlot] = 0.0f;
samplePitch[curSlot] = 0x20B7;
sampleEnd[curSlot] = 16.0f;
sampleLoopLength[curSlot] = 16.0f;
slotSamplePointer[curSlot] = music[slotKeyPointer[curSlot] + 4] * 0x10;*/
}else if((slotInstType[curSlot] & 7) == 3){ //Wav
//printf("W %X : %X %X %X %X\n", slotNoteLen[curSlot], chVol[i], slotNoteVel[curSlot], slotKeyPointer[curSlot], filePos);
sampleDone[curSlot] = true;
slotFree[curSlot] = true;
temp[0] = slotNote[curSlot];
for(int wi = 0; wi < 16; wi++){
gb_write(0x30 + wi, music[slotSamplePointer[curSlot] + wi]);
}
gb_write(0x1A, 0x80);
gb_write(0x1C, 0x20);
gb_write(0x1D, (freqTableGB[temp[0]] & 0xFF));
gb_write(0x1E, 0x80 | (freqTableGB[temp[0]] >> 8));
/*
slotPitchFill[curSlot] = slotPitch[curSlot] = FREQ_TABLE[(music[slotKeyPointer[curSlot] + 1] + 12) << 7];
sampleDone[curSlot] = false;
samplePos[curSlot] = 0;
sampleOutput[curSlot] = 0;
slotADSRState[curSlot] = 0;
slotADSRVol[curSlot] = 0;
slotAttack[curSlot] = (7 - music[slotKeyPointer[curSlot] + 8]) * 0x24;
if(slotAttack[curSlot] == 0) slotAttack[curSlot] = 1;
slotDecay[curSlot] = (7 - music[slotKeyPointer[curSlot] + 9]) * 0x24;
if(slotDecay[curSlot] == 0) slotDecay[curSlot] = 1;
slotSustain[curSlot] = (music[slotKeyPointer[curSlot] + 10]) * 0x11;
slotRelease[curSlot] = (7 - music[slotKeyPointer[curSlot] + 11]) * 0x24;
if(slotRelease[curSlot] == 0) slotRelease[curSlot] = 1;
slotPanL[curSlot] = chPanL[i];
slotPanR[curSlot] = chPanR[i];
samplePitchFill[curSlot] = sampleRate;
sampleLoops[curSlot] = 1;
sampleLoop[curSlot] = 0.0f;
samplePitch[curSlot] = 0x20B7;
sampleEnd[curSlot] = 32.0f;
sampleLoopLength[curSlot] = 32.0f;
slotWavNibble[curSlot] = 0;*/
}else if((slotInstType[curSlot] & 7) == 4){ //Noise
slotAttack[curSlot] = music[slotKeyPointer[curSlot] + 8];
slotDecay[curSlot] = music[slotKeyPointer[curSlot] + 9];
slotSustain[curSlot] = music[slotKeyPointer[curSlot] + 10];
slotRelease[curSlot] = music[slotKeyPointer[curSlot] + 11];
sampleDone[curSlot] = true;
slotFree[curSlot] = true;
temp[1] = 0;
unsigned int tempVolR = (slotNoteVel[curSlot] * 0x80 * chPanR[i]) >> 0xE;
unsigned int tempVolL = (slotNoteVel[curSlot] * 0x7F * chPanL[i]) >> 0xE;
if(tempVolR > 0xFF) tempVolR = 0xFF;
if(tempVolL > 0xFF) tempVolL = 0xFF;
unsigned int envGoal = (tempVolL + tempVolR) >> 4;
if(envGoal > 0x0F) envGoal = 0x0F;
unsigned char susGoal = (envGoal * ((unsigned int)slotSustain[curSlot]) + 15) >> 4;
if(music[slotKeyPointer[curSlot] + 2] > 0) temp[1] = 0x40;
//printf("NS : %X %X %X %X : %X %X : %X\n", chVol[curSlot], slotNoteVel[curSlot], chPanL[i], chPanR[i], tempVolL, tempVolR, susGoal);
gb_write(0x21, susGoal);//for testing
//gb_write(0x22,0xC1);
gb_write(0x23, 0x80 | temp[1]);
/*
slotPitchFill[curSlot] = slotPitch[curSlot] = 1; //FREQ_TABLE[(music[slotKeyPointer[curSlot] + 1] + 12) << 7];
sampleDone[curSlot] = false;
samplePos[curSlot] = 0;
sampleOutput[curSlot] = 0;
slotADSRState[curSlot] = 0;
slotADSRVol[curSlot] = 0;
slotAttack[curSlot] = (7 - music[slotKeyPointer[curSlot] + 8]) * 0x24;
if(slotAttack[curSlot] == 0) slotAttack[curSlot] = 1;
slotDecay[curSlot] = (7 - music[slotKeyPointer[curSlot] + 9]) * 0x24;
if(slotDecay[curSlot] == 0) slotDecay[curSlot] = 1;
slotSustain[curSlot] = (music[slotKeyPointer[curSlot] + 10]) * 0x11;
slotRelease[curSlot] = (7 - music[slotKeyPointer[curSlot] + 11]) * 0x24;
if(slotRelease[curSlot] == 0) slotRelease[curSlot] = 1;
slotPanL[curSlot] = chPanL[i];
slotPanR[curSlot] = chPanR[i];
samplePitchFill[curSlot] = sampleRate;
sampleLoops[curSlot] = 1;
sampleLoop[curSlot] = 0.0f;
samplePitch[curSlot] = 0x6E0;
slotSamplePointer[curSlot] = music[slotKeyPointer[curSlot] + 4];
if(slotSamplePointer[curSlot]) sampleEnd[curSlot] = 0x7F;
if(!slotSamplePointer[curSlot]) sampleEnd[curSlot] = 0x7FFF;
sampleLoopLength[curSlot] = sampleEnd[curSlot];*/
}else{
sampleDone[curSlot] = true;
slotFree[curSlot] = true;
//printf("%X Invalid Inst Type?:%X\n", i, slotInstType[curSlot]);
}
}else{
temp[1] = 0;
if(temp[0] >= 0xD0) temp[1] = (DELTA_TIME[temp[0] - 0xD0]);
if(music[filePos] < 0x80){ //note argument provided?
lastNote[i] = read_byte();
chPointer[i]++;
}
if(music[filePos] < 0x80){ //velocity argument provided?
lastVel[i] = read_byte();
chPointer[i]++;
}
if(temp[1] > 0){ //Optional delta - time
if(music[filePos] < 0x80){
temp[1] += read_byte();
chPointer[i]++;
}
}
}
chPointer[i]++;
}else if(temp[0] >= 0x80 && temp[0] <= 0xB0){ //Delta - Time
if(temp[0] > 0x80) chDelay[i] += DELTA_TIME[temp[0] - 0x81];
delayHit = true;
chPointer[i]++;
}else{
printf("Illegal Instruction 0x%X at: %X\n", temp[0], filePos - 1);
running = false;
delayHit = true;
}
break;
}
chPointer[i] -= repeated;
}
}
if(chDelay[i] > 0) chDelay[i] -= 1; //change this
}
}
for(int i = 0; i < 16; i++){
if(slotNoteLen[i] > 0){
slotNoteLen[i] -= 1; //change this
if(slotNoteLen[i] == 0){
slotFree[i] = 0;
slotADSRState[i] = 3;
slotADSRVol[i] = slotSustain[i];
if((slotInstType[i] & 7) == 1){
gb_write(0x12, 0);
gb_write(0x13, 0);
gb_write(0x14, 0x80);
}else if((slotInstType[i] & 7) == 2){
gb_write(0x17, 0);
gb_write(0x18, 0);
gb_write(0x19, 0x80);
}else if((slotInstType[i] & 7) == 3){
gb_write(0x1A, 0);
}else if((slotInstType[i] & 7) == 4){
gb_write(0x21, 0);
gb_write(0x23, 0);
}
}
}
}
}
for(int i = 0; i < 16; i++){
switch(slotADSRState[i]){
case 0:
slotADSRVol[i] += slotAttack[i];
if(slotADSRVol[i] < 0xFF) break;
slotADSRState[i]++;
slotADSRVol[i] = 0xFF;
break;
case 1:
slotADSRVol[i] -= slotDecay[i];
if(slotADSRVol[i] > slotSustain[i]) break;
slotADSRState[i]++;
slotADSRVol[i] = slotSustain[i];
case 2:
slotADSRVol[i] = slotSustain[i];
break;
case 3:
slotADSRVol[i] -= slotRelease[i];
if(slotADSRVol[i] > 0) break;
slotADSRVol[i] = 0;
slotADSRState[i]++;
sampleDone[i] = true;
slotFree[i] = 0;
break;
}
volModL[i] = (slotNoteVel[i] / 127.0f) * (chVol[slotChannel[i]] / 127.0f) * (slotADSRVol[i] / 255.0f);
volModR[i] = volModL[i] * (slotPanR[i] / 127.0f);
volModL[i] *= (slotPanL[i] / 127.0f);
}
}
mixer[0] = 0;
mixer[1] = 0;
for(int i = 0; i < 16; i++){ //process each slot
if(slotFree[i] != 0 && !sampleDone[i]){
signed long tune = slotMidiFreq[i] + chPitchBendCur[slotChannel[i]];
if(tune < 0) tune = 0;
if(tune >= (128 * 128)){
printf("Freq to high:%X\n", tune);
tune = (128 * 128) - 1;
}
tune = FREQ_TABLE[tune];
sampleOutput[i] = music[(int)(samplePos[i] + slotSamplePointer[i])];
if(sampleOutput[i] >= 0x80) sampleOutput[i] -= 0x100;
sampleOutput[i] = (sampleOutput[i]) / 512.0f;
samplePos[i] += ((samplePitch[i] * (tune / slotPitch[i])) / sampleRate);
if(samplePos[i] >= sampleEnd[i]){
if(sampleLoops[i]){
samplePos[i] = sampleLoop[i] + fmod((samplePos[i] - sampleLoop[i]), sampleLoopLength[i]);
}else{
sampleDone[i] = true;
slotFree[i] = 0;
}
}
mixer[0] += (sampleOutput[i] * volModL[i]); //left
mixer[1] += (sampleOutput[i] * volModR[i]); //right
}
}
//GameBoy Synths Sound generation loop
soundChannelPos[0] += freqTable[gb_hram[0x13] + ((gb_hram[0x14] & 7) << 8)] / (SAMPLE_RATE / 32);
soundChannelPos[1] += freqTable[gb_hram[0x18] + ((gb_hram[0x19] & 7) << 8)] / (SAMPLE_RATE / 32);
soundChannelPos[2] += freqTable[gb_hram[0x1D] + ((gb_hram[0x1E] & 7) << 8)] / (SAMPLE_RATE / 32);
soundChannelPos[3] += freqTableNSE[gb_hram[0x22]] / (SAMPLE_RATE);
while(soundChannelPos[0] >= 32) soundChannelPos[0] -= 32;
while(soundChannelPos[1] >= 32) soundChannelPos[1] -= 32;
while(soundChannelPos[2] >= 32) soundChannelPos[2] -= 32;
while(soundChannelPos[3] >= PU4TableLen) soundChannelPos[3] = 0;
soundBuffer[0] = 0;//change these to floats
soundBuffer[1] = 0;
if(gb_hram[0x26] & 0x80){
if(gb_hram[0x25] & 0x01) soundBuffer[0] += gb_ch1Vol * PU1Table[(int)(soundChannelPos[0])];
if(gb_hram[0x25] & 0x10) soundBuffer[1] += gb_ch1Vol * PU1Table[(int)(soundChannelPos[0])];
if(gb_hram[0x25] & 0x02) soundBuffer[0] += gb_ch2Vol * PU2Table[(int)(soundChannelPos[1])];
if(gb_hram[0x25] & 0x20) soundBuffer[1] += gb_ch2Vol * PU2Table[(int)(soundChannelPos[1])];
if((gb_hram[0x25] & 0x04) && (gb_hram[0x1A] & 0x80)) soundBuffer[0] += gb_ch3Vol * gb_WAVRAM[(int)(soundChannelPos[2])];
if((gb_hram[0x25] & 0x40) && (gb_hram[0x1A] & 0x80)) soundBuffer[1] += gb_ch3Vol * gb_WAVRAM[(int)(soundChannelPos[2])];
soundChannel4Bit = (int)(soundChannelPos[3]) & 7;
if(gb_hram[0x25] & 0x08) soundBuffer[0] += gb_ch4Vol * ((((PU4Table[(int)(soundChannelPos[3]/8)] << soundChannel4Bit) & 0x80) << 2) - 0x100);
if(gb_hram[0x25] & 0x80) soundBuffer[1] += gb_ch4Vol * ((((PU4Table[(int)(soundChannelPos[3]/8)] << soundChannel4Bit) & 0x80) << 2) - 0x100);
}
out[0] = mixer[0] + ((float)(soundBuffer[0])/0x1000f);
out[1] = mixer[1] + ((float)(soundBuffer[1])/0x1000f);
}