Answer to preceding post ... ByteBeat

As you may have tried yourself, the tiny binaries produced by the preceding code create long tunes directly coded by a function of time !

So you basically have s=f(t) where s is the output sample, t the sample id and f a simple expression as the one I put on the title.

The thing is you can actually build quite complex song with it ! 

This technique has been called bytebeat and the main article describing it was made by someone named "viznut".

See the original article here http://countercomplex.blogspot.fr/2011/10/algorithmic-symphonies-from-one-line-of.html or here http://canonical.org/~kragen/bytebeat/




and and example with trippy visualizations :

I surely will include one or two of them in a test audio program on the sdk .. In the meantime here is the code :

	#include <stdint.h>
	#include "bitbox.h"
	int song;
	unsigned int t;
	// bitbox port Makapuf 2015 - code GPL - songs by their respective author, idea and first implmentation by Viznut
	// See : http://countercomplex.blogspot.fr/2011/10/algorithmic-symphonies-from-one-line-of.html <-- not one line of html :)
	// also : http://pelulamu.net/countercomplex/music_formula_collection.txt
	/* yes, the whole melody is done with single line equations ... */
	void game_snd_buffer(uint16_t* buffer, int len) {
	uint8_t u=0,v;
	for (int i = 0; i < len; i++) {
	if (i%4 ==0) {
	t++; // sample rate = 8kHz
	switch(song) {
	case 0 : u=(t*(t>>8|t>>9)&46&t>>8)^((t&t>>13)|t>>6); break; // "lost in space" by xpansive
	case 1 : u=(t|(t>>9|t>>7))*t&(t>>11|t>>9); break; // by red-
	case 2 : u=(t*5&(t>>7))|(t*3&(t*4>>10)); break;
	case 3 :
	v=t>>(7-(t>>15))&-t>>(7-(t>>15)); // By droid
	u=v?t>>4|(t&(t>>5) / v) : 0; // guarding against divbyzero
	break;
	case 4 : u=t*(42&t>>10);break; // by .. many
	case 5 : u=(t>>(t>>5*(t>>13)%8))|(t>>4) ;break; // by The_Cjay
	case 6 : u=((1-(((t+10)>>((t>>9)&((t>>14))))&(t>>4&-2)))*2)*(((t>>10)^((t+((t>>6)&127))>>10))&1)*32+128;break; // by Ola
	case 7 : u=t*((t>>13)&31&t>>9)-((t>>7)&23&t>>3); break; // ack
	default : u=0;
	}
	}
	buffer[i] = u<<8 | u;
	}
	}
	// complex "game" indeed
	void game_init() {}
	void game_frame() {
	static int pb;
	int b=button_state();
	if (b&!pb) {
	song = (song +1 )%8;
	t=0;
	message("song %d\n",song);
	}
	pb=b;
	}
	void graph_line() {}
	void graph_frame() {}

view raw main.c hosted with ❤ by GitHub

	NAME=bytebeat
	GAME_C_FILES=main.c
	NO_USB=1
	NO_VGA=1
	include $(BITBOX)/lib/bitbox.mk

view raw Makefile hosted with ❤ by GitHub