Entry 97

Cinematics fade out at their end; the overlay's semi-transparent shapes are drawn

2026-10-154mvideo

Filescrates/rugrats/src/media/cine.rs crates/rugrats/src/ui/hud.rs crates/rugrats/src/app/play.rs crates/rugrats/src/app/mod.rs crates/rugrats/src/stage.rs crates/rugrats-render/src/renderer.rs crates/rugrats/examples/opening_shot.rs

Two fixes.

The cinematic's end fade (0x8007424c, docs/engine/cinematics.md). For each frame shown with fewer than 13 frames of the stream left, unless the music byte has 1, 0x800c3f2c rises by 25 (to 255) and the flip draws the screen fade (0x8001cf2c). Bit 1 is set for cines 0 (the opening), 3, 4 and 39. Cine 64 measured in the port: the mean brightness holds at 169 to frame 163, then 144, 120, 98 ... and 0 from 174 of 176.

hud::fade is the screen fade (a POLY_F4, draw mode 0x640, the screen less the grey). Boot::Fade (96) and the cinematic share it.

The overlay's semi-transparent shapes were never drawn. The renderer has a list for them (set_overlay_semi), but nothing filled it. The opaque overlay pass skips semi-transparent triangles, so 96's fade drew nothing either. Two changes:

• Stage::overlay_semi picks them out. The app and the shot tools (opening, stage, level, play_script, card, screen) now hand them over.
• The renderer draws them after the opaque overlay, so a fade covers the HUD as the original's flip covers everything.

Nothing else on the overlay is semi-transparent today. The title's added layer goes under the world, so nothing that drew before changes.