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Merge remote-tracking branch 'origin/fix/windows-gl-dwm-vsync' into local/base-fixes

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Shokunin
2026-10-22 12:57:10 -07:00
parent fc73841e8c 594b507efd
commit 36ee507a5c
1 changed files with 20 additions and 3 deletions
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runtime/src/main.cpp
+20 -3
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@@ -3977,7 +3977,18 @@ static void sync_guest_cadence_to_video_standard(void) {
static int host_driver_vsync_unreliable(void) {
#ifdef _WIN32
return 0;
/* Windows OpenGL, windowed or borderless: DWM composes the window and
* owns the display's vsync, so a driver swap interval adds nothing but a
* stall. On NVIDIA (R4 0.8, RTX 4080, 610.88) a vsync'd SwapBuffers holds
* the GPU queue the render thread submits to: the render thread's frame
* then costs a whole refresh (16.7 ms "GPU" at any internal scale,
* render_busy 100 %), back-pressure slows the guest to 52-57 Hz, and
* dynamic resolution drops for nothing. Swap interval 0 under the
* wall-clock pacer: 60.0 Hz, 4.4 ms. Exclusive fullscreen (2) keeps
* driver vsync. PSX_TRUST_DRIVER_VSYNC=1 restores it everywhere. */
if (const char *e = std::getenv("PSX_TRUST_DRIVER_VSYNC"); e && e[0] && e[0] != '0')
return 0;
return (g_video_renderer == 1 && g_fullscreen != 2) ? 1 : 0;
#else
static int cached = -1;
if (cached >= 0)
@@ -4088,8 +4099,14 @@ static void log_present_cadence(void) {
!g_netplay_vsync_forced_off) {
if (host_driver_vsync_unreliable()) {
std::printf("psxrecomp: present cadence: wall-clock pacer "
"(%.4f ms/frame); driver vsync off under WSL\n",
g_frame_period_ms);
"(%.4f ms/frame); driver vsync off (%s)\n",
g_frame_period_ms,
#ifdef _WIN32
"Windows GL: DWM composes"
#else
"under WSL"
#endif
);
} else if (present_effective_swap_interval() != 0) {
std::printf("psxrecomp: present cadence: wall-clock pacer "
"(%.4f ms/frame); synchronized swaps on %.0f Hz panel\n",