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[xray] 20s deadline #2385

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nick black 2021-11-28 04:26:52 -05:00 committed by nick black
parent 0c89881266
commit cee5c267a2
1 changed files with 25 additions and 17 deletions
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34
src/demo/xray.c
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@ -74,7 +74,7 @@ struct marsh {
float dm; // delay multiplier
int next_frame;
struct ncplane** lplane; // plane to destroy
uint64_t deadline_ns; // be done by this CLOCK_MONOTONIC
uint64_t startns; // when we started (CLOCK_MONOTONIC) for frame dropping
int* frame_to_render; // protected by renderlock
};
@ -97,28 +97,30 @@ make_plane(struct notcurses* nc, struct ncplane** t){
}
// returns the index of the next frame, which can immediately begin to be
// rendered onto the thread's plane.
// rendered onto the thread's plane. if we're behind the clock, we don't
// bother blitting it, and drop the plane to signal as much.
static int
get_next_frame(struct marsh* m, struct ncvisual_options* vopts){
int ret = 0;
// one does the odds, and one the evens. load two unless we're the even,
// and it's the first frame.
if(m->next_frame){
if(ncvisual_decode(m->ncv)){
ret = -1;
return -1;
}
}
if(ret == 0){
if(ncvisual_decode(m->ncv)){
ret = -1;
return -1;
}
uint64_t ns = clock_getns(CLOCK_MONOTONIC);
int ret = m->next_frame;
uint64_t deadline = m->startns + (m->next_frame + 1) * 20 * (NANOSECS_IN_SEC / VIDEO_FRAMES);
if(ns > deadline){
ncplane_destroy(vopts->n);
vopts->n = NULL;
}else if(ncvisual_blit(m->nc, m->ncv, vopts) == NULL){
ret = -1;
return -1;
}
}
if(ret == 0){
ret = m->next_frame;
m->next_frame += 2;
}
return ret;
}
@ -139,6 +141,9 @@ xray_thread(void *vmarsh){
if(make_plane(m->nc, &vopts.n)){
return NULL;
}
// if we're behind where we want to be time-wise, this will return the
// expected frame id, but vopts.n will be NULL (and the plane we created
// will have been destroyed). that frame has been dropped.
if((frame = get_next_frame(m, &vopts)) < 0){
ncplane_destroy(vopts.n);
// FIXME need to cancel other one; it won't be able to progress
@ -152,8 +157,11 @@ xray_thread(void *vmarsh){
}
int x = ncplane_x(m->slider);
if(ncplane_move_yx(m->slider, 1, x - 1) == 0){
// FIXME otherwise, increment a visible drop count?
if(vopts.n){
ncplane_reparent(vopts.n, notcurses_stdplane(m->nc));
ncplane_move_top(vopts.n);
}
ncplane_destroy(*m->lplane);
ret = demo_render(m->nc);
}
@ -201,7 +209,7 @@ int xray_demo(struct notcurses* nc){
.frame_to_render = &last_frame,
.dm = notcurses_check_pixel_support(nc) ? 0 : 0.5 * delaymultiplier,
.ncv = ncv1,
.deadline_ns = curns + MAX_SECONDS * NANOSECS_IN_SEC,
.startns = curns,
.lplane = &kplane,
};
struct marsh m2 = {
@ -211,7 +219,7 @@ int xray_demo(struct notcurses* nc){
.frame_to_render = &last_frame,
.dm = notcurses_check_pixel_support(nc) ? 0 : 0.5 * delaymultiplier,
.ncv = ncv2,
.deadline_ns = curns + MAX_SECONDS * NANOSECS_IN_SEC,
.startns = curns,
.lplane = &kplane,
};
int ret = -1;