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Map legacy surface fades and cyclic reset

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gamer147
2026-07-29 10:34:03 -04:00
parent 1678459b05
commit e70b506ec4
5 changed files with 155 additions and 69 deletions
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docs/engine-re.md
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@@ -1355,6 +1355,24 @@ channel, samples the exact triangular phase on the shared frame clock, and compo
T(anchor)`. It remains frame-driven while visible and survives native-style object cloning independently
of the immediate and delayed one-shot scale fields.
**Cyclic-channel reset follow-up (2026-07-29):** opcode `0x230` is the shared reset for this looping
animation family. `op_0x230_reset_gfx_cyclic_animations@0x423ba0` takes one retained-object handle and
calls `gfx_object_reset_cyclic_animation_channels@0x47ee60`. The worker gets or creates the object, clears
active flag bit 2, and zeroes five start/period pairs:
| channel field | start | period |
|---|---:|---:|
| looping color | `obj+0x20c` | `obj+0x220` |
| cyclic scale | `obj+0x210` | `obj+0x224` |
| cyclic rotation | `obj+0x214` | `obj+0x228` |
| second cyclic matrix | `obj+0x218` | `obj+0x22c` |
| looping source rectangle | `obj+0x21c` | `obj+0x230` |
It does not change the object's current/base transforms. Five DEBUGADV calls reset an effect object before
demonstrating a new looping asset; FIELD's sole ordinary call resets the temporary moving-unit handle
between its one-shot translation setup and `0x239` source-cell animation. This is a bounded retained-state
operation and is the recommended follow-up after the black-fade pair below.
**Follow-up resolution (2026-07-10):** `0x21f` is the one-shot axis-angle channel and is implemented with
affine rasterization. `0x223` is **not affine**: `gfx_queue_surface_alpha_transition` (`0x47f440`) inserts
a type-0 command-map record keyed by arg 1: start `+4`, delay/duration `+8/+0xc`, target surface slot `+0x10`,
@@ -3154,6 +3172,32 @@ retained objects when `0x20c` targets an offscreen surface, composites the captu
source on the shared frame clock, blocks the VM through the endpoint, and only then permits the following
surface release/root reload. Headless hosts retain their non-rendering no-op policy.
#### Single-surface black/white fade family — `0x21`–`0x24` (2026-07-29)
The widest remaining opcode `0x22` is not a new renderer. It and `0x21` are the single-surface siblings of
the already implemented mode-4 `0x25` transition. Dispatch-table resolution gives:
| op | handler | transition mode | endpoint |
|---|---|---:|---|
| `0x21` | `op_0x21_fade_surface_in_from_black@0x41cb00` | 0 | captured surface |
| `0x22` | `op_0x22_fade_surface_out_to_black@0x41cbc0` | 1 | black |
| `0x23` | `op_0x23_fade_surface_in_from_white@0x41cc80` | 2 | captured surface |
| `0x24` | `op_0x24_fade_surface_out_to_white@0x41cd40` | 3 | white |
All four take `(surface_slot, timing_argument)`, set run-state bit 8, and use the exact `0x25` timing
conversion: arguments up to 64 use `argument` milliseconds per tick with alpha step 16; larger arguments
use `argument/16` milliseconds with step 1. Modes 0/2 start with an opaque solid scratch surface over the
captured frame and lower its alpha to zero. Modes 1/3 keep the captured frame opaque and raise the
black/white scratch alpha to 255. Re-entry finalizes the named endpoint before script execution resumes.
Himegari uses only the black pair: three `0x21` calls and eight `0x22` calls, all `(1,30)` and therefore
about 480 ms. The scripts first select surface 1, clear it, publish a complete retained frame through
`0x20c`, restore the backbuffer, then fade. `0x21` is the menu-entry reveal; `0x22` is the corresponding
menu/scene exit to black. Together they close 11 of the 39 remaining skipped instructions across seven
distinct scripts. Implementation should extend the existing `LegacyScreenTransition` host path with an
explicit solid-color endpoint; treating a missing numbered surface as black is unsafe because the current
mode-4 fallback snapshots the live retained frame.
The same manual pass exposed a resource-addressing issue after `0x6c` was fixed: ROOM did execute
`play-voice`, but `GodotAdvHost` attempted only inferred SC-section resolution. ROOM's voice operands
`0x3365..0x3376` are universal packed SYS4INI indices (for example `0x3365` is `EUA0016.OGG`). The first