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Windows GL vsync workaround: scope to the measured case

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Narrow host_driver_vsync_unreliable() on Windows to the configuration the
stall was measured on: GL active, render thread running, GL_VENDOR NVIDIA,
not exclusive fullscreen. Other driver families and the unthreaded path
keep driver vsync; PSX_TRUST_DRIVER_VSYNC=1 still forces it everywhere.
Evaluated per call, so runtime renderer/fullscreen changes apply.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Shokunin
2026-10-22 14:17:33 -07:00
parent 594b507efd
commit cb17f2f2d4
3 changed files with 20 additions and 4 deletions
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runtime/src/main.cpp
+11 -4
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@@ -3958,11 +3958,18 @@ static int host_driver_vsync_unreliable(void) {
* 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. */
* wall-clock pacer: 60.0 Hz, 4.4 ms.
*
* Scope is the measured case only: GL renderer active, the render thread
* running, GL_VENDOR NVIDIA, and not exclusive fullscreen (2). Other
* driver families, the unthreaded path and exclusive fullscreen keep
* driver vsync. Re-evaluated per call, so runtime fullscreen/renderer
* changes take effect. PSX_TRUST_DRIVER_VSYNC=1 keeps driver vsync. */
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;
return (g_video_renderer == 1 && g_gl_active && g_fullscreen != 2 &&
gl_renderer_render_thread_active() &&
gl_renderer_vendor_is_nvidia()) ? 1 : 0;
#else
static int cached = -1;
if (cached >= 0)
@@ -4076,7 +4083,7 @@ static void log_present_cadence(void) {
"(%.4f ms/frame); driver vsync off (%s)\n",
g_frame_period_ms,
#ifdef _WIN32
"Windows GL: DWM composes"
"Windows GL, NVIDIA render thread: DWM composes"
#else
"under WSL"
#endif