static void animate_square(Square *sq)
{
sq->cx += sq->dx;
sq->cy += sq->dy;
sq->size += sq->dsize;
sq->rot += sq->drot;
sq->life += sq->dlife;
if (sq->size < 1.0 || sq->life > ALLEGRO_PI) {
ALLEGRO_BITMAP *bmp = al_get_target_bitmap();
gen_square(sq, al_get_bitmap_width(bmp), al_get_bitmap_height(bmp));
}
}
int process(unsigned nframes, void *v)
{
(void) v;
float seq_sqr[nframes];
float seq_noise[nframes];
float sqr[nframes];
float noise[nframes];
float lfo_f_out[nframes];
float filter_in[nframes];
float *output = (float*) jack_port_get_buffer(port, nframes);
void *josc_buf = jack_port_get_buffer(josc, nframes);
jack_midi_event_t in_event;
jack_nframes_t event_count = jack_midi_get_event_count(josc_buf);
// tag::buf-read[]
if(event_count)
{
for(unsigned i=0; i<event_count; i++)
{
jack_midi_event_get(&in_event, josc_buf, i);
assert(*in_event.buffer == '/');
RtDataImpl d;
ports.dispatch((char*)in_event.buffer+1, d);
}
}
while(uToB.hasNext())
{
RtDataImpl d;
d.matches = 0;
ports.dispatch(uToB.read()+1, d);
if(d.matches == 0)
fprintf(stderr, "Unknown Port '%s'\n", uToB.peak());
}
// end::buf-read
gen_seq(seq_sqr, seq_noise, &seq, nframes);
gen_noise(noise, seq_noise, nframes);
gen_square(sqr, seq_sqr, &osc, nframes);
gen_lfo(lfo_f_out, &lfo, nframes);
do_sum(filter_in, noise, sqr, nframes);
do_filter(output, filter_in, lfo_f_out, &filter, nframes);
return 0;
}
static void *thread_func(ALLEGRO_THREAD *thr, void *arg)
{
const int INITIAL_WIDTH = 300;
const int INITIAL_HEIGHT = 300;
const Background *background = (Background *) arg;
ALLEGRO_DISPLAY *display;
ALLEGRO_EVENT_QUEUE *queue = NULL;
ALLEGRO_TIMER *timer = NULL;
ALLEGRO_EVENT event;
ALLEGRO_STATE state;
Square squares[MAX_SQUARES];
double theta = 0.0;
bool redraw = true;
int i;
(void)thr;
al_set_new_display_flags(ALLEGRO_RESIZABLE);
display = al_create_display(INITIAL_WIDTH, INITIAL_HEIGHT);
if (!display) {
goto Quit;
}
queue = al_create_event_queue();
if (!queue) {
goto Quit;
}
timer = al_create_timer(0.1);
if (!timer) {
goto Quit;
}
al_register_event_source(queue, al_get_display_event_source(display));
al_register_event_source(queue, al_get_keyboard_event_source());
al_register_event_source(queue, al_get_timer_event_source(timer));
for (i = 0; i < MAX_SQUARES; i++) {
gen_square(&squares[i], INITIAL_WIDTH, INITIAL_HEIGHT);
}
al_start_timer(timer);
while (true) {
if (al_is_event_queue_empty(queue) && redraw) {
double r = 0.7 + 0.3 * (sin(theta) + 1.0) / 2.0;
ALLEGRO_COLOR c = al_map_rgb_f(
background->rmax * r,
background->gmax * r,
background->bmax * r
);
al_clear_to_color(c);
al_store_state(&state, ALLEGRO_STATE_BLENDER | ALLEGRO_STATE_TRANSFORM);
for (i = 0; i < MAX_SQUARES; i++) {
draw_square(&squares[i]);
}
al_restore_state(&state);
al_flip_display();
redraw = false;
}
al_wait_for_event(queue, &event);
if (event.type == ALLEGRO_EVENT_TIMER) {
for (i = 0; i < MAX_SQUARES; i++) {
animate_square(&squares[i]);
}
theta += 0.1;
redraw = true;
}
else if (event.type == ALLEGRO_EVENT_DISPLAY_CLOSE) {
break;
}
else if (event.type == ALLEGRO_EVENT_KEY_DOWN
&& event.keyboard.keycode == ALLEGRO_KEY_ESCAPE) {
break;
}
else if (event.type == ALLEGRO_EVENT_DISPLAY_RESIZE) {
al_acknowledge_resize(event.display.source);
}
}
Quit:
if (timer) {
al_destroy_timer(timer);
}
if (queue) {
al_destroy_event_queue(queue);
}
if (display) {
al_destroy_display(display);
}
return NULL;
}
