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Matthew Stanley
a8f37c1f76
Pure-2D sprite games (Mega Man X6) render a true 4:3 field of view with no
overscan to reveal, so 16:9 requires making the engine draw more. Two parts:
- [widescreen] full_2d opts a pure-2D game into the native-wide present path
(it never emits the 3D sprite-tag hook the gameplay detector keys on, so
every in-game frame was misclassified as a 4:3 menu and pillarboxed).
- [widescreen.bg2d] is a gen-time hook on the per-layer background tile
renderer (MMX6 FUN_800270d0) at its column-count / start-tile-column /
start-screen-x instructions, routed through gpu.c psx_ws_mmx6_bg_{cols,
startcol,startx}. It draws LEFT=ceil(nw_offset/16) extra 16px columns on
BOTH sides so the loop fills the 16:9 reveal margins with real adjacent
stage, existing columns staying pixel-aligned with objects. Identity at
4:3 and in the engine's own 512 hi-res mode (so the title is untouched).
Tooling: wide_full debug command + sw_wide_dump_full dump the entire
native-wide compositor surface (both vertical-double-buffer y-bands and both
reveal margins) for diagnosis.
Known follow-ups: object screen-X cull widen (actors in the margins);
top/bottom flicker + stale-margin refresh on the vertical double-buffer.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>