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The previous version of hud_demo passed `score & 0x0F` and tile
index `1` (= Heart) to nt_set / nt_fill_h, but the demo had no
Heart sprite declared and tile 1 in CHR was uninitialized garbage.
The result was a screen of blue smileys with a tiny red strip in
the corner — the buffer mechanism worked, but the visual gave no
sense that anything HUD-shaped was happening.
This commit makes the HUD actually look like a HUD:
- 12 sprite declarations (Bar, Heart, Digit0..9, Ball) that the
compiler lays into CHR at known tile indices in declaration
order. Tile-index constants (`BAR_TILE`, `HEART_TILE`,
`DIGIT_BASE`) match that order so the call sites can use names
instead of magic numbers.
- bg1 palette restructured to `[red, white, yellow]` so pixel-art
characters resolve to visible colours: `#` = red (background
fill), `%` = white (heart shape), `@` = yellow (digit strokes).
- Background pre-paints row 1 with the solid `Bar` (red) tile
via a `legend { "B": 1 }` entry, giving the HUD a uniform red
canvas for individual cell writes to land on.
- Eight `nt_attr` calls at startup paint the entire top metatile
row (4 rows × 32 cols) with sub-palette 1 so the HUD chrome
reads as visually distinct from the playfield.
The result at frame 180 is unmistakably HUD-shaped: a yellow-on-
red status bar at the top of the screen above blue playfield with
a yellow ball bouncing around. Per-frame cost still scales with
what changed — `last_score` / `last_lives` shadow-compares mean
the buffer stays empty on the ~58 of 60 frames where nothing
ticks.
Tests: 758 pass. Clippy clean. 48/48 emulator goldens match.
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| .. | ||
| goldens | ||
| .gitignore | ||
| harness.html | ||
| package-lock.json | ||
| package.json | ||
| record_gif.mjs | ||
| run_examples.mjs | ||