mirror of
https://github.com/imjasonh/nescript
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615490fbe5
The previous commit parked the sprite-0 hit anchor on top of the visible HUD coin at NT col 2, row 1 — the hit therefore fired at dot 19 of scanline 15 (the HUD's last scanline) and jsnes's PPU model applied the scroll change to the rest of that same scanline, smearing the bottom row of every HUD glyph as `camera_x` drifted. The score "0"/"2" digit, the heart, and the lives "3" each flickered a handful of different pixel patterns per frame as the scroll shifted. An in-harness check for unique HUD states across the 180-frame window saw ~20-40 distinct states. Fix: move both anchors off the HUD row entirely. - `TILE_SPRITE0_ANCHOR` still has its single opaque pixel at row 7, col 3, but now draws at OAM `(248, 8)` so the pixel lands at screen `(251, 16)` — the first scanline of the playfield. - New `TILE_BG_ANCHOR` (tile 28) mirrors it with a single opaque pixel at row 0, col 3; the map pre-paints it at NT `(col 31, row 2)` via the new `a` legend entry. Its one opaque pixel lands at the same `(251, 16)`, so the PPU's sprite-0 hit fires there instead. - An explicit `scroll(0, 0)` right before `sprite_0_split` defensively re-latches scroll to zero in case jsnes has carried stale `$2005` state over from the previous frame. With the hit on scanline 16, `$2005` writes in HBLANK of scanline 16 (or thereabouts) only affect scanline 17 onward; rows 8-15 all render at scroll=0 and the HUD glyphs stay pixel-stable. The unique-state count across the 180-frame harness drops from ~40 to 4 — and those 4 correspond to the legitimate score / lives transitions (initial title, post- stomp-1, post-stomp-2, etc.), not per-frame jitter. Column 31 and OAM x=248 both sit inside jsnes's right-edge overscan so the anchor pixels are invisible in the committed golden. Goldens + gif refreshed. |
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| .. | ||
| goldens | ||
| .gitignore | ||
| harness.html | ||
| package-lock.json | ||
| package.json | ||
| record_gif.mjs | ||
| run_examples.mjs | ||