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Fix AE001H cyclic color blending

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gamer147
2026-07-11 22:21:10 -04:00
parent f195934324
commit b41ae36168
8 changed files with 140 additions and 36 deletions
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docs/opcode-reference.md
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@@ -287,8 +287,9 @@ Native handler gfx_op_0x20c_present_frame -> gfx_render_frame @0x4820b0. This is
- **evidence:** Native /v2 decompile: worker stores period at obj+0x230, frame_count at +0x238, columns at +0x23c. Interpolator computes ((now-start)/period)%frame_count, then offsets both source-rect X bounds by rect_width*(frame%columns) and Y bounds by rect_height*(frame/columns). SC0000 uses (100,8,4) with AE001H's eight 200x200 cells in a 4x2 800x400 sheet.
### 0x232 `u00421EF0` (u00421EF0, argc 4)
- **summary:** 0x232 anim-color (handle)(period)(alpha)(color): ping-pong the object color/alpha toward the packed target over period ms (pulsing GLOW). Worker gfx_worker_anim_color @0x47ef50 -> interpolator COLOR channel. C# VM: GfxState.SetColorAnim. See docs/engine-re.md §SC0000 anim cluster.
- **grounding:** source=kelebek, confidence=low
- **summary:** 0x232 anim-color (handle)(period)(alpha)(color): ping-pong the temporary packed ARGB passed to the normal object blit. Handler resolves negative alpha/RGB from static color obj+0x60 and clamps alpha above 255. Blend selector obj+0x30 is unchanged: mode 0 keeps default opaque blending (animated alpha is inert; RGB is vertex modulation), while mode 1 consumes ARGB alpha as opacity. Fresh static color is 0xffffffff. The C# VM resolves sentinels and consumes sampled ARGB through the unchanged mode-specific path. See docs/engine-re.md §SC0000 anim cluster.
- **grounding:** source=investigation, confidence=high
- **evidence:** Ghidra /v2: gfx_op_0x232_anim_color@0x423c30 resolves sentinels then calls gfx_worker_anim_color@0x47ef50; gfx_object_anim_interpolate@0x473ed0 samples static obj+0x60 toward target obj+0x240 into a temporary packed color; gfx_object_composite@0x47f650 passes that color plus unchanged selector obj+0x30 to gfx_object_blit_d3d9@0x4774c0. Blit mode 0 enables no alpha blend and passes RGB as modulation; mode 1 enables SRCALPHA/INVSRCALPHA. gfx_object_init_default@0x472810 initializes obj+0x60=0xffffffff. SC0000 0x1a0e (handle,1200,224,-1) is therefore 0xffffffff<->0xe0ffffff with inert alpha and identity RGB: no visible pulse. C# regressions cover exact AE001H visual invariance, negative-RGB preservation, mode-0 RGB modulation, and mode-1 alpha opacity.
### 0x234 `anim-start` (anim-start, argc 5)
- **summary:** (handle)(period_ms)(axis_x)(axis_y)(axis_z) — configure cyclic rotation. Worker stores period obj+0x228, start obj+0x214=0, and float axis obj+0x244; each frame uses integer degrees floor(((now-start)%period)*360/period). gfx_object_composite right-multiplies this separately anchored transform after the one-shot scale/rotation/translation product, so cyclic rotation also rotates the translation vector.