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[yield] remove globals, fixes #2300 on this branch

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nick black 2021-11-01 16:12:41 -04:00 committed by nick black
parent 28a037b6c0
commit 05d928003d
1 changed files with 8 additions and 9 deletions
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17
src/demo/yield.c
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@ -4,16 +4,14 @@
// the only dynamic information which needs be shared between the two threads
// is the last polyfill origin, the total filled count, and whose turn it is.
static int maxy;
static int maxx;
static int total;
struct marsh {
int id; // unique for each thread, mono-increasing
int* turn; // whose turn it is to prep the ncvisual, shared
int* rturn; // whose turn it is to render, shared
int* polyy; // last shared polyfill origin (y)
int* polyx; // last shared polyfill origin (x)
int maxy; // pixels, y dimension
int maxx; // pixels, x dimension
uint32_t* polypixel; // last shared polyfill pixel (rgba)
int* filled; // shared, how many have we filled?
unsigned* done; // shared, are we done?
@ -38,13 +36,13 @@ yielder(struct marsh* m){
int iters = 0;
// less than this, and we exit almost immediately. more than this, and we
// run closer to twenty seconds. 11/50 it is, then. pixels are different.
const long threshold_painted = total * 11 / 50;
const long threshold_painted = m->maxy * m->maxx * 11 / 50;
pthread_mutex_lock(&lock);
while(*m->turn != m->id && !*m->done){
pthread_cond_wait(&cond, &lock);
}
while(*m->filled < threshold_painted && iters < MAXITER && !*m->done){
//fprintf(stderr, "%d/%d tfilled: %ld thresh: %ld total: %ld\n", maxy, maxx, *m->filled, threshold_painted, total);
//fprintf(stderr, "%d/%d tfilled: %d thresh: %ld total: %d\n", m->maxy, m->maxx, *m->filled, threshold_painted, m->maxy * m->maxx);
int pfilled = 0;
// the first time the first thread runs, it does not pick up the previous
// polyfill origin (as there was none). all other runs, we do.
@ -54,8 +52,8 @@ yielder(struct marsh* m){
int filledcopy;
do{
++iters;
int x = rand() % maxx;
int y = rand() % maxy;
int x = rand() % m->maxx;
int y = rand() % m->maxy;
ncvisual_at_yx(m->ncv, y, x, m->polypixel);
if(ncpixel_a(*m->polypixel) != 0xff){ // don't do areas we've already done
continue;
@ -254,7 +252,8 @@ int yield_demo(struct notcurses* nc){
ncplane_destroy(m1.vopts.n);
return -1;
}
total = geom.pixy * geom.pixx;
m1.maxy = m2.maxy = geom.pixy;
m1.maxx = m2.maxx = geom.pixx;
DEMO_RENDER(nc);