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re(ui): the game does query the display gamma -- measured, with its control

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Last iteration's corrected experiment, run. Boot with --log_mask=12
--log_level=3 (Kernel logging on, Cpu/Gpu off), which changes nothing
about the output and so cannot perturb the capture harness the way the
gamma-cvar experiment would have.

VdGetCurrentDisplayGamma is called once, at video init:

  d> VdGetSystemCommandBuffer(701CF830, 701CF804)
  d> VdGetCurrentDisplayGamma(701CE1F8(00000000), 701CE1F0(0))
  d> VdSetDisplayMode(40000000)
  d> VdGetCurrentDisplayInformation(701CF110)

The control is in the same log: 359 VdRetrainEDRAM and 358
VdGetSystemCommandBuffer lines, so an absent call would have been
visible. Per the export's own comment the returned type is "used in D3D
SetGammaRamp/SetPWLGamma" -- the game asks the question a ramp-builder
asks, at the moment one would ask it.

Still open, and stated: whether it then WRITES the ramp, and whether the
measured gamma 1.34-1.49 is that ramp. The write is a GPU register
operation (DC_LUT), invisible to kernel logging; a GPU trace records
gamma ramps as a command type (TraceWriter::WriteGammaRamp), which is
where to look next.

Worth its own METHOD line: this had been parked behind "needs the
emulator to reach a menu" for several iterations, and it needed the
emulator only to BOOT -- video init happens in the first seconds. A
blocker that stops one experiment does not stop every experiment in the
same area.
This commit is contained in:
Sylpheed RE agent
2026-08-29 02:51:32 +00:00
parent 93b0a6b20f
commit c6ce000002
4 changed files with 52 additions and 8 deletions
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9
docs/re/data/gamma-call-evidence.txt Normal file
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# canary --log_mask=12 --log_level=3 (Kernel logging ON), 2026-08-29
# control: the same log carries 359 VdRetrainEDRAM and 358 VdGetSystemCommandBuffer lines,
# so a missing call would have been visible.
F 820006F4 8284E27C 1B9 ( 441) VdGetCurrentDisplayGamma
F 8200070C 8284E2BC 1BA ( 442) VdGetCurrentDisplayInformation
F 82000710 8284E2CC 1D3 ( 467) VdSetDisplayMode
d> F8000008 VdGetSystemCommandBuffer(701CF830, 701CF804)
d> F8000008 VdGetCurrentDisplayGamma(701CE1F8(00000000), 701CE1F0(0))