Entry 267

Mutation's stream effect tasks: the opening's text and eleven more

2026-09-28videovolumes

Filescrates/piney-stream/src/opening.rscrates/piney-stream/src/mutation.rscrates/piney-stream/src/effect.rscrates/piney-gen/src/manifest.rs

Mutation's StreamDemoFuncTbl (MUT main 0x00367210) has 40 rows, not 23: Infection's 22, then 18 of its own on 13 functions (Outbreak has the same names). A stream whose scene names none plays bare: its noise, feedback, fades, flashes, transfers and texts missing. Twelve of the thirteen are ported now (crates/piney-stream/src/opening.rs, mutation.rs); Func_str1070 is not.

The opening (stream 24)

Func_str0710 (MUT main 0x0019c140) is Func_str0581's kind: the ccStrEffectCtrl, the ending's table walker and puff bursts over its own eventObjTbl_0710 (0x00366e30, five rows), plus two blocks of text lines, a class new in Mutation (constructor 0x00187960, SetText 0x00187bd0, fade 0x00187ac0). Cues 700 and 710 put a text in a block, centre each line by its bytes and fade the block in by 0.05 a frame; 709 and 719 fade it out. The texts sit in the executable (normal and Parody Mode's); the build reads them (opening_text), never the repository. SetObj and ccEffPart0580::Create are Infection's code instruction for instruction.

The others

Most are Infection's kind of task with their own fog, shades, fades, feedback and transfers (MUT charHeightTbl rows 0, 6, 15 and 17); Func_str0880's hit marks turn by a four-row table of its own (0x00366ed0), which the build reads (hit_rot_0880); Func_str9204 serves str9204-str9206 with Func_str9000's letterbox; str9201 and str9301 run Func_str9101, already ported. The table of cues is in docs/engine/stream.md, "Mutation's other effect tasks". The generator finds each function by its row (demo_func), then its tables by the code that builds them, so Outbreak and Quarantine read theirs too; Infection's table has none of these rows.

Two things found on the way:

• Func_str0932's SetFog(0, 0, 0, 0, 0) at frame 1700 divides 0 by 0. The EE gives the largest float, so the fog is held at its near value (none); the port's f32 gave NaN, full fog. SceneFog::with_rates follows the EE now.
• Func_str1040's four texts are stream 31's own subtitle records 16-19 (evStrMsgTbl[31] + 192), already in the build.

Checked by the unit tests opening::tests and mutation::tests (the line placing, the fades, the shades' depths); nothing runs these tasks against the game's code yet.