ref: 4ae000bc715d98584e88082897ed9355e195b522
dir: /waves.c/
#include <u.h>
#include <libc.h>
#include <draw.h>
#include <event.h>
#include <thread.h>
#define ROOT2 1.05946309436
#define RATE 44100;
Image *back;
int rate;
double tones[16];
double *buf[2];
double ab = 0.0;
void
redraw(Image *screen)
{
Rectangle r, dot, b;
int dur = rate/4;
int w, h;
int i;
draw(screen, screen->r, back, nil, ZP);
// balance
r = screen->r;
r.max.y = r.min.y + 30;
draw(screen, insetrect(r, 3), display->white, nil, ZP);
r.min.x += Dx(screen->r) * (ab + 1.0)/2.0 - 1;
r.max.x = screen->r.min.x + Dx(screen->r) * (ab + 1.0)/2.0 + 1;
draw(screen, r, display->black, nil, ZP);
// A
r = screen->r;
r.min.y += 30;
r.max.y -= 30;
r.max.x -= Dx(screen->r)/2;
r = insetrect(r, 3);
w = Dx(r);
h = Dy(r);
draw(screen, r, display->white, nil, ZP);
for(i = 0; i < dur; i++){
dot = rectaddpt(Rect((int)(((double)i/dur) * w),
(int)(((buf[0][i] + 1.0)/2.0) * h),
(int)(((double)(i+1)/dur) * w),
(int)(((buf[0][i] + 1.0)/2.0) * h) + 1),
r.min);
draw(screen, dot, display->black, nil, ZP);
}
for(i = 0; i < 3; i++){
r = screen->r;
r.min.y = r.max.y - 30;
r.max.x = r.min.x + Dx(r)/6;
b = insetrect(rectaddpt(r, Pt(Dx(r)*i, 0)), 3);
draw(screen, b, display->white, nil, ZP);
}
// B
r = screen->r;
r.min.y += 30;
r.max.y -= 30;
r.min.x += Dx(screen->r)/2;
r = insetrect(r, 3);
w = Dx(r);
h = Dy(r);
draw(screen, r, display->white, nil, ZP);
for(i = 0; i < dur; i++){
dot = rectaddpt(Rect((int)(((double)i/dur) * w),
(int)(((buf[1][i] + 1.0)/2.0) * h),
(int)(((double)(i+1)/dur) * w),
(int)(((buf[1][i] + 1.0)/2.0) * h) + 1),
r.min);
draw(screen, dot, display->black, nil, ZP);
}
for(i = 0; i < 3; i++){
r = screen->r;
r.min.y = r.max.y - 30;
r.max.x = r.min.x + Dx(r)/6;
b = insetrect(rectaddpt(r, Pt(Dx(r)*(i+3), 0)), 3);
draw(screen, b, display->white, nil, ZP);
}
flushimage(display, 1);
}
void
eresized(int new)
{
if(new && getwindow(display, Refnone) < 0)
fprint(2,"can't reattach to window");
redraw(screen);
}
void
audioproc(void *unused)
{
int i, j, step, dur;
double tone, sum;
short out;
char *buffer;
char str[6*16+2];
int k;
int fd = open("/mnt/monome/buttons", OREAD);
if (fd < 0)
sysfatal("open /mnt/monome/buttons: %r");
dur = rate/4;
buffer = malloc(dur * 2);
for(;;){
for(j = 0; j < 16; j++){
if (readn(fd, str, 6*16+2) != (6*16+2))
sysfatal("readn /mnt/monome/buttons: %r");
k = atoi(&str[j*6]);
for(step = 0; step < dur; step++){
sum = 0.0;
for(i = 0; i < 16; i++){
if(k & (1<<i)){
tone = tones[16 - i - 1];
sum += buf[0][(int)(step*(tone/4)) % dur] * (ab - 1.0) * -0.5;
sum += buf[1][(int)(step*(tone/4)) % dur] * (ab + 1.0) * 0.5;
}
}
out = (short)(sum * 2047.0 * pow(0.9999, step/10.0));
buffer[step*2+0] = out & 0xFF;
buffer[step*2+1] = (out >> 8) & 0xFF;
}
write(1, buffer, dur*2);
}
}
free(buffer);
}
void
threadmain(int argc, char **argv)
{
int i, j;
int dur;
Mouse m;
Point xy;
int dx;
rate = RATE;
if(argc > 1)
rate = atoi(argv[1]);
dur = rate/4;
if(initdraw(0, 0, "waves") < 0)
sysfatal("initdraw: %r");
einit(Emouse);
back = allocimage(display, Rect(0,0,1,1), CMAP8, 1, 0x777777FF);
if(back == nil)
sysfatal("allocimage: %r");
buf[0] = malloc(dur * sizeof(double));
buf[1] = malloc(dur * sizeof(double));
for(i = 0; i < dur; i++)
buf[0][i] = buf[1][i] = cos(((double)i/dur)*2*PI);
for(i = 0; i < 16; i++){
tones[i] = 220.0;
for(j = 0; j < i; j++)
tones[i] *= ROOT2;
}
eresized(0);
proccreate(audioproc, nil, 8192*8);
for(;;m = emouse()){
if(m.buttons & 1){
xy = subpt(m.xy, screen->r.min);
if (xy.y < 30) {
ab = (double)xy.x / Dx(screen->r);
ab -= 0.5;
ab *= 2.0;
}
if ((screen->r.max.y - m.xy.y) < 30){
dx = Dx(screen->r)/6;
if (xy.x < dx)
for(i = 0; i < dur; i++)
buf[0][i] = cos(((double)i/dur)*2*PI);
else if (xy.x < 2*dx) {
for(i = 0; i < dur; i++)
buf[0][i] = 1.0;
for(i = dur/4; i < 3*dur/4; i++)
buf[0][i] = -1.0;
}
else if (xy.x < 3*dx) {
for(i = 0; i < dur/2; i++)
buf[0][i] = -((double)i/(dur/2)*2.0-1.0);
for(i = dur/2; i < dur; i++)
buf[0][i] = -(0.75-((double)i/dur))*4.0;
}
else if (xy.x < 4*dx)
for(i = 0; i < dur; i++)
buf[1][i] = cos(((double)i/dur)*2*PI);
else if (xy.x < 5*dx) {
for(i = 0; i < dur; i++)
buf[1][i] = 1.0;
for(i = dur/4; i < 3*dur/4; i++)
buf[1][i] = -1.0;
}
else if (xy.x < 6*dx) {
for(i = 0; i < dur/2; i++)
buf[1][i] = -((double)i/(dur/2)*2.0-1.0);
for(i = dur/2; i < dur; i++)
buf[1][i] = -(0.75-((double)i/dur))*4.0;
}
}
redraw(screen);
}
}
}