The Port asks whether the blend is evaluated on sRGB-encoded values or
linearised and re-encoded. It is answered by one register field I already
log, and the answer is the same on every draw of two full captures.
RB_COLOR_INFO.color_format is k_8_8_8_8 (0) on 2402/2402 splash draws and
33779/33791 draws of the boot-through-title capture; the other 12 are
k_32_FLOAT and k_16_16_FLOAT and are not colour passes. k_8_8_8_8_GAMMA (1)
appears ZERO times, and color_exp_bias is 0 everywhere so nothing stands in
for a gamma either.
The mechanism is Canary's own source, not our inference: k_8_8_8_8_GAMMA is
the ONLY colour format around which a piecewise-linear gamma<->linear
conversion is applied (spirv_shader_translator.h:510 PWLGammaToLinear /
LinearToPWLGamma, render_target_cache.h:720, dxbc_shader_translator_om.cc).
With k_8_8_8_8 there is none, so the blender operates on the stored values
as they are.
So a renderer that linearises before blending and re-encodes after is doing
a different operation -- and the difference is gamma-shaped and exactly zero
on unblended pixels, which is the divergence signature the port reports.
Also renamed my units-per-second pre-registration off the 'h4' prefix: the
Port's BLOCKED.md numbers this blend-space question H4 and two different H4s
in one corpus is how a citation goes wrong.
Three rows the port is blocked on:
H3 -- 2 units per guest frame, measured on the plate's own ramp against a
pre-registration. Their 5 excluded by >2x, and the reason named: an alpha
step is not a clock rate without the element's declared T, and my own
splash-quad-timeline.txt published alpha against frame with no T column.
That file now warns at its head.
The title settle anchor is t~160, not t=118 -- it is ptcopyright, the last
build-in element and the only glyph one. Said plainly that this is the
reading under which their clock:'shared' collapses, and that a consequence
is not a counter-argument.
Told them NOT to change their 60 units/s yet: units/second is untouched by
this and two of my own captures disagree ~2.9x on frames->seconds.
The pad: sub_82457038 reads every field of XINPUT_GAMEPAD, 14/14 loads
verified against the image, plus a second keystroke-queue path. Flagged as
the superset the game can SEE, not the per-screen set, so it is used to
check a binding table and not to write one.
