spinal cord
attempt at tracker style music
Diff: main.cpp
- Revision:
- 14:97a5deea7c94
- Parent:
- 13:8ce494870ba6
--- a/main.cpp Sat Nov 17 16:33:51 2018 +0000
+++ b/main.cpp Sun Nov 25 08:58:30 2018 +0000
@@ -6,106 +6,56 @@
Pokitto::Core mygame;
Pokitto::Display d;
-//------------------------[ Button handling, very accurate ]------------------------
-#define HELD 0
-#define NEW 1
-#define RELEASE 2
-byte CompletePad, ExPad, TempPad, myPad;
-bool _A[3], _B[3], _C[3], _Up[3], _Down[3], _Left[3], _Right[3];
-
-DigitalIn _aPin(P1_9);
-DigitalIn _bPin(P1_4);
-DigitalIn _cPin(P1_10);
-DigitalIn _upPin(P1_13);
-DigitalIn _downPin(P1_3);
-DigitalIn _leftPin(P1_25);
-DigitalIn _rightPin(P1_7);
-
-void UPDATEPAD(int pad, int var) {
- _C[pad] = (var >> 1)&1;
- _B[pad] = (var >> 2)&1;
- _A[pad] = (var >> 3)&1;
- _Down[pad] = (var >> 4)&1;
- _Left[pad] = (var >> 5)&1;
- _Right[pad] = (var >> 6)&1;
- _Up[pad] = (var >> 7)&1;
-}
-
-void UpdatePad(int joy_code){
- ExPad = CompletePad;
- CompletePad = joy_code;
- UPDATEPAD(HELD, CompletePad); // held
- UPDATEPAD(RELEASE, (ExPad & (~CompletePad))); // released
- UPDATEPAD(NEW, (CompletePad & (~ExPad))); // newpress
-}
-
-byte updateButtons(byte var){
- var = 0;
- if (_cPin) var |= (1<<1);
- if (_bPin) var |= (1<<2);
- if (_aPin) var |= (1<<3); // P1_9 = A
- if (_downPin) var |= (1<<4);
- if (_leftPin) var |= (1<<5);
- if (_rightPin) var |= (1<<6);
- if (_upPin) var |= (1<<7);
-
- return var;
-}
-
-
typedef struct{
- bool playSample;
- int soundPoint;
- const uint8_t *currentSound;
- int currentSoundSize;
- int volume;
- int speed;
- int repeat;
+ bool playSample; // should this sound be playing now?
+ int soundPoint; // current position of sound
+ const uint8_t *currentSound; // currend sound array playing
+ uint32_t currentSoundSize; // length of current sound
+ int volume; // volume of sound, best to be 63 or lower
+ int speed; // how fast to play sound, 256 = 100%
+ bool repeat; // 1 to repeat 0 not to
+ int repeat_start; // start point of repeat, default should be 0
+ int repeat_end; // end point of repeate, default should be currentSoundSize
+ char lastSample; // previous sample played
} sampletype;
-sampletype snd[4]; // up to 4 sounds at once?
+sampletype snd[4]; // up to 4 sounds at once?
int oldQuart;
-uint32_t nextBufferIndexToFill = 0;
-uint32_t nextT = 0;
-
int currentLine=0;
int mytick=0;
-
-
-// note_speed << octave. = speed to play sample
-
-int note_speed[]={ 27,30,16,18,20,21,24, 29,0 ,17,19,0 ,23,25};
-// A B C D E F G A# B# C# D# E# F# G#
-
+int pattern=0;
-void emptyBuffer(){
- for(int t=0; t<SBUFSIZE;){
- soundbuf[++t]=0;
- }
-
- for(int t=0; t<4; t++){
- snd[t].playSample=0;
- }
+Ticker soundPlay;
+Ticker musicTimer;
-}
+const float note_speed[]={
+// C, C#, D, D#, E, F, F#, G, G#, A, A#, B,
+16.00, 16.95, 17.96, 19.03, 20.16, 21.36, 22.62, 23.97, 25.40, 26.91, 28.51, 30.21,
+32.00, 33.90, 35.92, 38.05, 40.31, 42.71, 45.25, 47.95, 50.79, 53.82, 57.02, 60.41,
+64.00, 67.81, 71.84, 76.11, 80.64, 85.43, 90.51, 95.89, 101.60, 107.63, 114.03, 120.81,
+128.00, 135.61, 143.67, 152.21, 161.26, 170.85, 181.02, 191.78, 203.18, 215.27, 228.06, 241.63,
+256.00, 271.22, 287.34, 304.43, 322.54, 341.71, 362.03, 383.56, 406.36, 430.53, 456.13, 483.25,
+511.99, 542.44, 574.69, 608.86, 645.06, 683.43, 724.07, 767.12, 812.74, 861.06, 912.27, 966.51,
+1023.98, 1084.87, 1149.38, 1217.73, 1290.14, 1366.85, 1448.13, 1534.24, 1625.47, 1722.13, 1824.53, 1933.02,
+2047.96, 2169.74, 2298.77, 2435.46, 2580.27, 2733.71, 2896.26, 3068.48, 3250.94, 3444.25, 3649.06, 3866.05,
+4095.93, 4339.49, 4597.52, 4870.91, 5160.55, 5467.41, 5792.52, 6136.96, 6501.89, 6888.51, 7298.12, 7732.08
+};
-uint8_t playSound(int channel, const unsigned char *sound, uint16_t soundSize, int volume = 255, int speed=255, int repeat=0){
-/*
- int channel=0;
- for(int t=0; t<4; t++){
- if(snd[t].playSample==0){
- channel=t;
- }
- }
-*/
- snd[channel].currentSound = sound;
- snd[channel].currentSoundSize = (soundSize*255)/speed;
- snd[channel].soundPoint = 0;
- snd[channel].playSample = 1;
- snd[channel].volume = volume;
- snd[channel].speed = speed;
- snd[channel].repeat = repeat;
+uint8_t playSound(int channel, const unsigned char *sound, uint32_t soundSize, int volume = 255, int speed=255, int repeat=0){
+
+ // to resample current sample rate to 44100, cheap and probably wrong way
+ float rate1 = 44100 / (float)sampleRates[channel];
+ // speed = 256 / rate1; // playback speed is
+ speed = speed / rate1; // playback speed is
+
+ snd[channel].currentSound = sound; // sound to play
+ snd[channel].currentSoundSize = (soundSize<<8)/speed; // length of sound array adjusted for speed change
+ snd[channel].volume = 63; // volume, best kept below 64 as louder will cause clipping when playing multiple samples
+ snd[channel].speed = speed; // recalculated above
+ snd[channel].repeat = repeat; // 1 to repead, 0 to not
+ snd[channel].soundPoint = 0; // where the current sound is upto
+ snd[channel].playSample = 1; // 1 to play this sound, 0 not to
return channel;
}
@@ -116,7 +66,9 @@
int ss[4];
for(int s=0; s<4; s++){
+
ss[s] = (snd[s].currentSound[(snd[s].soundPoint*snd[s].speed)>>8]*snd[s].volume>>8) * snd[s].playSample;
+
++snd[s].soundPoint;
if(snd[s].soundPoint >= snd[s].currentSoundSize){
if(snd[s].repeat){
@@ -128,66 +80,43 @@
}
}
-
-// temp = (ss[0] + ss[1] + ss[2] + ss[3]) - (ss[0] * ss[1] * ss[2] * ss[3]);
- temp = ((127 - ss[0] + ss[1] + ss[2] + ss[3])/4)+127;
+ temp = (ss[0] + ss[1] + ss[2] + ss[3]) - ((ss[0] * ss[1] * ss[2] * ss[3])/256);
return temp;
}
-// Fills an audio buffer with the samples generated by the Bytebeat function
-void generateBuffer(uint32_t bufferIndex, uint32_t nextT) {
-
- //bufferIndex = (currentBuffer + 2)&3;
+
+void updateAudioBuffer(){
+ // when updating the audio buffer, I split the buffer into 4 and fill
+ // a part that isn't being played, so there are no sync issues
- uint32_t index= 0;
- for(uint32_t t=0; t<BUFFER_SIZE; t++,index++){
- uint8_t sample = mixSound(t);
- buffers[bufferIndex][index] = sample;
- }
-
-}
-
-
-void updateSample(){
-
- int quart = soundbufindex / 512;
- int sndOffset[]={512,1024,1536,0};
-
+ int quart = soundbufindex / 512;
+ int sndOffset[]={1024,1536,0,512};
+
+ // only update if the current playback pointer is nowhere near where we want to fill
if(oldQuart != quart){
oldQuart = quart;
- for(int t=0; t<SBUFSIZE/4;){
+ for(int t=0; t<=SBUFSIZE/4;){
uint8_t sample = mixSound(t);
soundbuf[t+sndOffset[quart]] = sample;
-
- for(int s=0; s<4; s++){
- ++snd[s].soundPoint;
- if(snd[s].soundPoint >= snd[s].currentSoundSize){
- if(snd[s].repeat){
- snd[s].soundPoint=0;
- }else{
- snd[s].playSample=0;
- }
- }
- }
t++;
}
}
-
}
void update_tune(){
+ char pat = my_pattern[pattern];
+
for(int t=0; t<4; t++){
- char note = tune[pattern][currentLine][t][0];
- char octave = tune[pattern][currentLine][t][1];
- char instrument = tune[pattern][currentLine][t][2];
- char volume = tune[pattern][currentLine][t][3] * 4;
+ int note = tune[pat][currentLine][t][0];
+ int octave = tune[pat][currentLine][t][1]; // no longer used
+ int volume = tune[pat][currentLine][t][2];// max volume from xm/mod was 64
+ int instrument = tune[pat][currentLine][t][3];
if(note > 0){
-
- int speed = (note_speed[note-1] << octave); // >> 1
-
+ int speed = note_speed[(note-1)+12*octave];
+
switch(instrument){
case 1:
playSound(t, s_01, sizeof(s_01), volume, speed, sampleRepeat[0]);
@@ -202,75 +131,43 @@
playSound(t, s_04, sizeof(s_04), volume, speed, sampleRepeat[3]);
break;
}
+
}
-
- snd[t].volume = volume;
-
+ if(volume >= 128){
+ snd[t].volume = volume-128;
+ }
}
- if(currentLine++==63){
+ if(currentLine++==patternLength){
currentLine=0;
- pattern++;
+ if(pattern++==sizeof(my_pattern))pattern=loopTo;
}
}
+
+
int main ()
{
mygame.begin();
mygame.setFrameRate(255);
-// emptyBuffer(); // clear the sound buffer
-
- // The audio engine uses 4 buffers. Generate all 4 buffers ahead.
- uint32_t nextT = 0;
- generateBuffer(0, nextT); nextT += BUFFER_SIZE;
- generateBuffer(1, nextT); nextT += BUFFER_SIZE;
- generateBuffer(2, nextT); nextT += BUFFER_SIZE;
- generateBuffer(3, nextT); nextT += BUFFER_SIZE;
-
- // Set global audio variables
- currentBuffer = 0;
- currentPtr = buffers[currentBuffer];
- endPtr = currentPtr + BUFFER_SIZE;
// Init audio stream.
pokPlayStream(); // activate stream
mygame.sound.ampEnable(true);
mygame.sound.playMusicStream();
-
+
+ // check and update the sound buffer as often as we can
+ soundPlay.attach(&updateAudioBuffer, 0.0001);
+ musicTimer.attach(&update_tune, 0.055);
- uint32_t nextBufferIndexToFill = 0;
+ d.color = 1;
while (mygame.isRunning())
{
-// updateSample();
-
- // Fill the next buffer if it is not used currently
- if((uint32_t)currentBuffer != nextBufferIndexToFill) {
- // Generate buffer
- generateBuffer(nextBufferIndexToFill, nextT);
-
- if(++nextBufferIndexToFill > 3)
- nextBufferIndexToFill = 0;
- nextT += BUFFER_SIZE;
- }
-
- if(++mytick==2){
- mytick=0;
-
- update_tune();
- }
-
if (mygame.update())
{
- // update buttons
- myPad = updateButtons(myPad);
- UpdatePad(myPad);
-
- d.color = 1;
- d.printf("Tick %d", mytick);
- d.printf("Line %d", currentLine);
-
+
}
}
}