Closes the one route t32-blend-mode-not-on-disc.md left open: the executable's
draw path. Canary's UI draw capture now logs RB_BLENDCONTROL0 per draw, and the
game was driven to the main menu and to EXTRAS with F10 at each.
The title-side UI uses two blend states and ONE pixel shader:
0x07010701 src=ONE dst=1-SRC_ALPHA alpha-over (premultiplied)
ptbase, pteff05, the fade quad, ptmsg, ptmsg2, pttitle, buttons
0x01010101 src=ONE dst=ONE ADDITIVE
ptframe1, ptframe2, ptframe3, pteff20, both rotated sweep strips
Two controls, both run before the result was read:
* the NDC->pixel conversion that identifies a draw by its quad size reproduces
1134 and 1303 px for the two rotated sweep strips -- numbers measured by a
different tool in a different session -- on BOTH screens. The tool prints
PASS/FAIL and disclaims its own output on FAIL.
* pixel shader 0xE59B2B3DA4AA9008 is used with BOTH states, 12 draws additive
and 18 alpha-over. ptframe1 and ptbase run the same shader; only the blend
register differs. So this is a blend result, not a shader result.
This confirms the port's independent measurement -- it solved the composite per
pixel from two backgrounds and found additive halves alpha-over's error on both
frames -- by a route with nothing in common with it.
So the blend is no longer authored: 'any blend you choose is authored' was true
of the disc and is not true of the game. What is still unknown is which field
selects it; elements sharing a mode are batched into one draw call, so the
selection happens before the draw.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
3a617ffafe
