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feat(#188): fading-wall + sliding-door translucency; hold open past animation settle

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Lands the fading-secret-door feature and fixes the door "flip-back" that
surfaced while testing it.

#188 — fading-wall doors (e.g. "Pedestal Weak Spot") fade their wall part
out via TransparentPartHook instead of swinging:
  - TranslucencyHookSink consumes TransparentPartHook -> TranslucencyFadeManager
    (per-(entity,part) linear translucency ramp; holds at End frame).
  - WbDrawDispatcher: new per-instance alpha SSBO (binding 7); ClassifyBatches
    takes opacityMultiplier (1 - translucency, per CMaterial::SetTranslucencySimple
    0x005396f0) forcing AlphaBlend; fully-invisible parts skipped.
  - mesh_modern.vert/.frag: binding-7 InstanceAlphaBuf -> vOpacityMultiplier ->
    FragColor.a *= vOpacityMultiplier.
  - Register AP-89: the fade multiplies sampled texture alpha, not a separate
    D3D9 material alpha channel (observably identical for texture-alpha==1 surfaces).

Door flip-back fix (affected BOTH #188 fading walls AND #187 sliding doors): a
door/wall that finished opening holds a single unchanging frame, so the
uncommitted IsEntityCurrentlyMoving cache-bypass narrowing dropped it onto the
Tier-1 static cache -- which only remembers the REST pose + opacity 1.0 --
snapping it visually shut/opaque while physics stayed open. Reverted that
narrowing: every Sequencer entity stays on the per-frame path (live pose + live
fade opacity), the known-good pre-optimization behavior. The per-frame CPU cost
that narrowing chased was a Debug-build artifact -- Release is GPU-bound
(~200 fps in Sawato, measured), so the unconditional add is free where it
matters. Left a code comment barring re-introduction.

Tests: full Core suite green (2649 passed, 2 skipped). Live visual gate PASSED --
both fading-wall and sliding doors hold open.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Erik 2026-07-09 09:17:50 +02:00
parent e2e285b855
commit 3284dd0aed
12 changed files with 625 additions and 14 deletions
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12
src/AcDream.App/Rendering/Shaders/mesh_modern.vert
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@ -105,6 +105,16 @@ layout(std430, binding = 6) readonly buffer InstanceIndoorBuf {
uint instanceIndoor[];
};
// #188: per-instance opacity multiplier, 1 per instance, parallel to the
// binding=0 instance buffer (same instanceIndex). 1.0 = unmodified; <1.0
// while a TransparentPartHook translucency fade is in flight for the
// entity/part this instance belongs to (e.g. the "fading wall" secret-
// passage doors). Multiplied against the sampled texture alpha in
// mesh_modern.frag.
layout(std430, binding = 7) readonly buffer InstanceAlphaBuf {
float instanceAlpha[];
};
// Core profile: redeclare gl_PerVertex so writing gl_ClipDistance[] is legal
// alongside gl_Position. The array is sized 8 to match the CellClip plane budget
// and the GL guarantee (GL_MAX_CLIP_DISTANCES >= 8). The host enables
@ -266,10 +276,12 @@ out vec3 vWorldPos;
out vec3 vLit; // A7: per-vertex Gouraud lighting (ambient + capped lights)
out flat uvec2 vTextureHandle;
out flat uint vTextureLayer;
out flat float vOpacityMultiplier; // #188
void main() {
int instanceIndex = gl_BaseInstanceARB + gl_InstanceID;
mat4 model = Instances[instanceIndex].transform;
vOpacityMultiplier = instanceAlpha[instanceIndex]; // #188
vec4 worldPos = model * vec4(aPosition, 1.0);
gl_Position = uViewProjection * worldPos;