Entry 128

The piano, the rugs and what floors touch

2026-10-166maudio

The walk/run handler 0x8005e1f4 does more each frame for the player's own walk (object flag 0x4000 off):

1. The object in focus (+0x1e8, worklog 118) has its touch called with the player's position. The flag-8 floor objects with touches:
   • level 11's 505: touch 12;
   • level 6's 926: touch 13;
   • level 6's piano keys 999-1006, 1046 and 1047: touch 15.
2. Tile flag 1, not on an object: the splash (0x80050770, worklog 117). In level 4 it also does Damage(player, 0, 3) every 36 VSyncs, unless progress +0x30 bit 32 is set or 0x800c4cd0 is 1. That is not ported: level 4 does not load under the probe to check it.
3. Tile flag 4, not on an object: 0x80054ee0 at a foot, slot 7 or 3. The foot is picked by the low bit of the C library's rand (0x800b1158, x * 0x41c64e6d + 0x3039 at 0x800eaf80). The puff is one sprite 266 (TEXPOS + 3192), kind 5, flags 0x305, size 50, 2000 ms, speed 50, within 1000 of up, face 0xd2800000.
4. On a step (event 256), with a rug in focus, a sound at the rug: 1160 → 73, 1161 → 75, 1162 → 76, 1163 → 74. These are level 16's rugs.

The piano (0x800522ec). The note goes through 0x8006f3a4, which keys on program 4, tone 3, note (key - 999) + 78 at the key, unless it is the note last played (0x800c4358). Then the sprites, from the 0x800c41a0 seed:

• keys 1046 and 1047: one of sprites 417-420, size 300, dropped straight down from one of objects 960-966, picked by the seed's first draw;
• the others: two of 415 or 416, size 100, within 2048 of up from the player.

Both are flags 0x10505, 500 ms, bounce 1000, spin 3000, speed rand % 250 capped at 100.

Touch 12 (0x80050d58): five of one of sprites 352-354 from the player, flags 0x1030705, size 100, ending on the floor.

Touch 13 (0x80051db4): three of one of sprites 376-379 from the object, flags 0x30705, size 100, 1000 ms, bounce 2048, spin 3391, face 0xc0800000, the object's damage.

Direct keys. A note is not an effect number, so Effect gains key (program, tone, note) and Game::key_at, which is heard like play_at. The app keys those on directly. Box toss's crunch (0x8006f2fc) was played as effect 43 + n (worklog 124). It is really program 0, tone 14 (13 in level 20), note 43 + (rand & 15), and now uses key_at.

Test: the_piano_plays walks Chuckie over key 999. Key [4, 3, 78] sounds and sprites 415/416 fly.