mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Shokunin
2e4badfc3f
The OSD query at the two present-skip sites now goes through ov_needs_present(), which falls through to host_osd_needs_present() unless the render thread is replaying a present with its recorded overlay state. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
48 lines
2.3 KiB
Python
48 lines
2.3 KiB
Python
#!/usr/bin/env python3
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"""Every GL present-skip site must be gated on the vsync-cadence query.
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The renderer may elide a swap whose front buffer is unchanged. The frontend
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calls present once per guest vblank, so eliding a swap also elides whatever
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that swap was blocking on. When driver vsync owns the guest cadence the
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wall-clock pacer is deliberately not run (they are XOR), which makes the swap
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block the ONLY throttle -- and an elided frame is then unthrottled. A game that
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presents every other vblank (BoF3, and any other 30 Hz-presenting title) ran at
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exactly 2x on a ~60 Hz panel until each skip site consulted this query.
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"""
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from pathlib import Path
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ROOT = Path(__file__).resolve().parents[2]
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RENDERER = (ROOT / "runtime" / "src" / "gpu_gl_renderer.c").read_text(
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encoding="utf-8"
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)
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MAIN = (ROOT / "runtime" / "src" / "main.cpp").read_text(encoding="utf-8")
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PACING = (ROOT / "runtime" / "include" / "frame_pacing.h").read_text(
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encoding="utf-8"
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)
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# The skip sites are the branches that increment the probe skip counter and
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# return without reaching SDL_GL_SwapWindow. Both consult the OSD, the
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# interpolation-cadence owner, and the vsync-cadence owner.
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skips = RENDERER.count("s_probe_skip++;")
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assert skips >= 2, "expected the VRAM and wide-FBO present-skip sites"
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assert RENDERER.count("!psx_present_vsync_owns_cadence() &&") == skips, (
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"every present-skip site must be gated on psx_present_vsync_owns_cadence(); "
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"an ungated skip lets the guest free-run when driver vsync owns cadence"
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)
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# The OSD query goes through ov_needs_present(), which is host_osd_needs_present()
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# except when the render thread replays a present recorded with its own copy
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# of the overlay state (docs/RENDER_THREAD.md).
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assert RENDERER.count("!ov_needs_present() &&") == skips
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assert ": host_osd_needs_present();" in RENDERER
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assert RENDERER.count("!gl_renderer_interpolation_owns_cadence()) {") == skips
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# The query is declared beside the pacer it is the XOR partner of, and defined
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# in the frontend that owns the cadence decision.
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assert "int psx_present_vsync_owns_cadence(void);" in PACING
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assert 'extern "C" int psx_present_vsync_owns_cadence(void) {' in MAIN
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assert "return present_vsync_owns_cadence();" in MAIN
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print("present-skip cadence guard passed (%d skip sites gated)" % skips)
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