Pokitto Community Team / ByteBeat3

Implementation of Bytebeat algorithm on Pokitto. Bytebeat is generated music which is made by algorithm using usually one line function. The music is created as 8-bit samples. The simplest Bytebeat function is " t & (t>>8)" which combines two sawtooth waves: one higher frequency tone (t) and the other lower frequency (t<<8) tone. Read more in: http://countercomplex.blogspot.fi/2011/10/algorithmic-symphonies-from-one-line-of.html

Dependencies:   PokittoLib

ByteBeat3 - mathematical beats

Implementation of Bytebeat algorithm on Pokitto. Bytebeat is generated music which is made by algorithm using usually one line function. The music is created as 8-bit samples.

The simplest Bytebeat function is " t & (t>>8)" which combines two sawtooth waves: one higher frequency tone (t) and the other lower frequency (t<<8) tone.

Read more in: http://countercomplex.blogspot.fi/2011/10/algorithmic-symphonies-from-one-line-of.html

main.cpp@0:89ca7e98cd78, 2018-03-30 (annotated)

Committer:
Haviital
Date:
Fri Mar 30 20:09:40 2018 +0000
Revision:
0:89ca7e98cd78
Child:
1:ca29888d96a9
First version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Haviital 0:89ca7e98cd78 1 #include "Pokitto.h"
Haviital 0:89ca7e98cd78 2
Haviital 0:89ca7e98cd78 3 Pokitto::Core mygame;
Haviital 0:89ca7e98cd78 4
Haviital 0:89ca7e98cd78 5 void generateBuffer(uint32_t bufferIndex, uint32_t nextT) {
Haviital 0:89ca7e98cd78 6
Haviital 0:89ca7e98cd78 7 uint32_t index= 0;
Haviital 0:89ca7e98cd78 8 for(uint32_t t=nextT; t<nextT+BUFFER_SIZE; t++,index++)
Haviital 0:89ca7e98cd78 9 //buffers[nextBufferIndexToFill][index] = t & (t>>8);
Haviital 0:89ca7e98cd78 10 buffers[bufferIndex][index] = ((t<<1)^((t<<1)+(t>>7)&t>>12))|t>>(4-(1^7&(t>>19)))|t>>7;
Haviital 0:89ca7e98cd78 11 //buffers[bufferIndex][index] = (t*9&t>>4|t*5&t>>7|t*3&t/1024)-1;
Haviital 0:89ca7e98cd78 12 }
Haviital 0:89ca7e98cd78 13
Haviital 0:89ca7e98cd78 14
Haviital 0:89ca7e98cd78 15 int main () {
Haviital 0:89ca7e98cd78 16 mygame.begin();
Haviital 0:89ca7e98cd78 17 mygame.display.persistence = true;
Haviital 0:89ca7e98cd78 18 mygame.display.paletteptr[2] = COLOR_YELLOW;
Haviital 0:89ca7e98cd78 19
Haviital 0:89ca7e98cd78 20 // Generate 4 buffers ahead
Haviital 0:89ca7e98cd78 21 uint32_t nextT = 0;
Haviital 0:89ca7e98cd78 22 generateBuffer(0, nextT); nextT += BUFFER_SIZE;
Haviital 0:89ca7e98cd78 23 generateBuffer(1, nextT); nextT += BUFFER_SIZE;
Haviital 0:89ca7e98cd78 24 generateBuffer(2, nextT); nextT += BUFFER_SIZE;
Haviital 0:89ca7e98cd78 25 generateBuffer(3, nextT); nextT += BUFFER_SIZE;
Haviital 0:89ca7e98cd78 26
Haviital 0:89ca7e98cd78 27 // Set global variables
Haviital 0:89ca7e98cd78 28 currentBuffer = 0;
Haviital 0:89ca7e98cd78 29 currentPtr = buffers[currentBuffer];
Haviital 0:89ca7e98cd78 30 endPtr = currentPtr + BUFFER_SIZE;
Haviital 0:89ca7e98cd78 31
Haviital 0:89ca7e98cd78 32 pokPlayStream(); // activate stream
Haviital 0:89ca7e98cd78 33 mygame.sound.ampEnable(true);
Haviital 0:89ca7e98cd78 34 mygame.sound.playMusicStream();
Haviital 0:89ca7e98cd78 35
Haviital 0:89ca7e98cd78 36 mygame.display.set_cursor(0,0);
Haviital 0:89ca7e98cd78 37 mygame.display.println("ByteBeat function:");
Haviital 0:89ca7e98cd78 38 mygame.display.println("");
Haviital 0:89ca7e98cd78 39 mygame.display.color = 2;
Haviital 0:89ca7e98cd78 40 mygame.display.println("((t<<1)^((t<<1)+(t>>7)");
Haviital 0:89ca7e98cd78 41 mygame.display.println("&t>>12))|t>>(4-(1^7&");
Haviital 0:89ca7e98cd78 42 mygame.display.println("(t>>19)))|t>>7");
Haviital 0:89ca7e98cd78 43
Haviital 0:89ca7e98cd78 44 uint32_t nextBufferIndexToFill = 0;
Haviital 0:89ca7e98cd78 45 while (mygame.isRunning()) {
Haviital 0:89ca7e98cd78 46 if (mygame.update()) {
Haviital 0:89ca7e98cd78 47
Haviital 0:89ca7e98cd78 48 if((uint32_t)currentBuffer != nextBufferIndexToFill) {
Haviital 0:89ca7e98cd78 49
Haviital 0:89ca7e98cd78 50 // Generate buffer if already played.
Haviital 0:89ca7e98cd78 51 generateBuffer(nextBufferIndexToFill, nextT);
Haviital 0:89ca7e98cd78 52
Haviital 0:89ca7e98cd78 53 if(++nextBufferIndexToFill > 3)
Haviital 0:89ca7e98cd78 54 nextBufferIndexToFill = 0;
Haviital 0:89ca7e98cd78 55 nextT += BUFFER_SIZE;
Haviital 0:89ca7e98cd78 56 }
Haviital 0:89ca7e98cd78 57 }
Haviital 0:89ca7e98cd78 58 }
Haviital 0:89ca7e98cd78 59 }