Entry 96

The fade before a cinematic in a level

2026-10-153mvideo

Filescrates/rugrats/src/app/flow.rs crates/rugrats/src/app/mod.rs crates/rugrats/src/app/play.rs crates/rugrats/src/audio/sound.rs docs/engine/sound.md

95 left the screen's fade before a cinematic posted inside a level (0x80018ad0). The port went straight to the cinematic.

Unless the cinematic's music byte has 16, the original:

• redraws the level as it stopped (0x8001886c: the camera and draw calls, no player or world update) for 127 dt;
• raises 0x800c3f2c by 256 / (127 / dt) a frame (21 at dt 10), to 255 at most;
• the flip (0x8001d00c) draws it with 0x8001cf2c: a POLY_F4 over the whole screen (+-256 x +-120 about the centre), semi-transparent, draw mode E1 0x640, so blend 2: the screen less the grey.

The picture darkens to black over 13 frames. With the byte's 32 the song starts its 60-tick fade down at the same moment (0x8006ef0c), and the pause at the cinematic's start (95) catches it part way.

The port's Boot::Fade holds the level and its stage. Each game frame it replaces its quad on the overlay with the next grey (Vtx::FLAT | SEMI, page blend 2), then opens the cinematic with Then::Resume. Spu::fade_song gives the song's fade-down.