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Present thread: never wait on a deadline more than 50 ms ahead

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A present deadline is at most a frame or two ahead. One further out was
anchored to a stale clock (savestate load, cadence change) and parked
the present thread for seconds with nothing swapped while emulation ran
on: 12-18 s frozen screens in R4 with frame interpolation on. Present at
once instead and log the first such deadline.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Shokunin
2026-10-22 04:58:48 -07:00
parent a6ba54f4f0
commit c8fbc2e008
1 changed files with 13 additions and 2 deletions
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runtime/src/gpu_gl_renderer.c
+13 -2
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@@ -10122,7 +10122,7 @@ static GLuint s_pts_tex[PT_MAX_SLOTS], s_pts_rb[PT_MAX_SLOTS], s_pts_fbo[
static uint64_t s_pts_deadline[PT_MAX_SLOTS];
static uint64_t s_pts_identity[PT_MAX_SLOTS];
typedef struct PresentSample { uint64_t ticks, identity, deadline; } PresentSample;
static _Atomic uint64_t s_pt_clock_ticks, s_pt_window_ticks, s_pt_late_drops, s_pt_unready_drops;
static _Atomic uint64_t s_pt_clock_ticks, s_pt_window_ticks, s_pt_late_drops, s_pt_unready_drops, s_pt_far_deadlines;
static PresentSample s_present_samples[128];
static uint64_t s_present_sample_count;
static atomic_flag s_present_sample_lock = ATOMIC_FLAG_INIT;
@@ -10221,7 +10221,18 @@ static void *pt_cb_present(void *user, int slot, void *ready) {
/* Never make a late temporal image stall a present. The fence is only
* a readiness test (zero timeout), after the CPU deadline wait. */
uint64_t wait_start=SDL_GetPerformanceCounter();
interp_wait_until_ex(s_pts_deadline[slot], SDL_GetPerformanceFrequency(), 0);
/* A present deadline is at most a frame or two ahead. One further out was
* anchored to a stale clock (savestate load, cadence change) and parked
* this thread for seconds with nothing swapped: present now instead. */
uint64_t deadline = s_pts_deadline[slot];
const uint64_t pt_freq = SDL_GetPerformanceFrequency();
if (deadline > wait_start + pt_freq / 20u) {
deadline = 0;
if (atomic_fetch_add(&s_pt_far_deadlines, 1) == 0)
fprintf(stdout, "psxrecomp: present thread: deadline %.0f ms ahead ignored\n",
(double)(s_pts_deadline[slot] - wait_start) * 1000.0 / (double)pt_freq);
}
interp_wait_until_ex(deadline, pt_freq, 0);
atomic_fetch_add(&s_pt_clock_ticks,SDL_GetPerformanceCounter()-wait_start);
int late = s_pts_extra[slot] && s_pts_deadline[slot] &&
SDL_GetPerformanceCounter() > s_pts_deadline[slot] + SDL_GetPerformanceFrequency() / 1000u;