Cockpit: the authentic punch STENCIL-CUT -- all 8 cockpits real (task #55)
The user caught the inversion (blocked viewports, see-through frames); the
answer came from the rasterizer board itself: an i860 disassembly of the
VREND.MNG firmware decoded the damageize handler (@0xf040f6f8) -- cmd 0x20
(vr_damage_action) writes the dpl_Punchize token triple onto the punch
geogroup's first three geometry chunks IN FILE ORDER:
chunk1 = the detailed window-aperture shapes -> an invisible per-pixel MASK
chunk2 = the coarse hull -> the ONLY colour-drawn geometry (where not masked)
chunk3 = byte-identical hull twin -> the damage-reset record, never visible
Visible canopy = hull-minus-apertures. Both earlier readings were wrong ways
around the same three chunks: dropping all punch left floating fragments (no
hull); hiding the duplicate pair hid the HULL and drew the MASK -- the exact
inversion observed.
Port: bgfload tags per punch patch {non-paired pmesh = mask (role 1),
first twin = hull (role 2), second twin = skip}; L4D3D DrawMesh runs
mask->stencil-1 (no colour/z-write, z-tested), hull->stencil-NOTEQUAL,
mask->stencil-0; device D24X8 -> D24S8 + stencil clear. The cut never
touches z, so later-drawn entities show through the apertures.
BT_COP_PLATES=1 disables (diag).
In-game, all 8 mechs on pure defaults: connected dark frames with clear
viewports -- thor (the footage mech) shows the central viewport + surrounding
frame exactly as filmed. Combat regression clean (kill + no NaN).
Arena textured punch uses the same firmware kit; the black-texel alpha path
there is a working approximation, flagged in the KB.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
arcattack
co-authored by
Claude Fable 5
Claude Fable 5
parent
8431e69b1a
commit
96b8892e7c
@@ -48,15 +48,15 @@ LOD whose band contains the camera distance.
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sibling `dpl_Damagize` FUN_004902b0 uses the same cmd with a different triple). Two cases: [T1]
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- **Textured** punch (arena walls/catwalks): black texels = HOLES (alpha-test in the opaque
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pass). Coplanar shells inside one LOD z-fight → depth-bias by submission ordinal. [T2]
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- **Texture-less** punch (the `*_cop` cockpit canopies: blakskn + `softer` ramp, NO texture tag
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in the BMF — byte-verified, 238-byte BLXSKIN.BMF): **the PUNCH-tagged patches ARE the
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transparent WINDOWS** (the whole tagged geogroup renders as holes); the visible frame is only
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the NON-punch geometry, itself an open strut lattice rendered single-sided with per-face
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INWARD winding (the l/r torso patches are MIRRORED, so no single global winding works).
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Verified by rendering every shell from its mech's AUTHORED eye (SKL [jointeye]) — the punch
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panes sit exactly over the window apertures in all 8 mechs; all-punch canopies
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(bhk1/loki/vulture/avatar) are authentically FRAMELESS. The old "canopy windows are punch
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texels" claim was WRONG — there is no texel to key. See [[cockpit-view]]. [T2 in-game, all 8]
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- **FINAL mechanism (i860 VREND.MNG firmware, decoded 2026-07-11): a punch geogroup is a
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THREE-CHUNK STENCIL-CUT KIT** -- in file order: aperture MASK (invisible per-pixel cutout),
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visible HULL (the only colour-drawn chunk, drawn where not masked), byte-identical hull TWIN
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(the damage-reset record, never visible). Visible result = hull-minus-apertures. Applies
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to cockpit canopies, arena punch (AR02 etc.) and outside-torso punch (VUX_TOR) alike -- the
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port's arena "black texels = holes" alpha-test path is a visual approximation that predates
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this decode (works; revisit for exactness). Port: bgfload punch-kit roles + the L4D3D
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stencil cut (D24S8). See [[cockpit-view]] + [[decomp-reference]] for firmware addresses.
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[T1 mechanism / T2 render-verified all 8 cockpits]
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## Shading model (from libDPL DPLTYPES.H)
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Shading is selected PER-GEOMETRY by vertex type:
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+15
-11
@@ -88,17 +88,21 @@ inverse(eyeWorld)`. No LookAt anywhere.
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(pos=(0.1,0.15,0.1), neg=(−0.1,−0.15,−0.1) — same for madcat AND bhk1) → the eye equilibrium
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is (0,0,0) and the clamps limit gyro motion to ±0.1..0.15u. The gyro is a BOUNCE/sway
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mechanism, NOT a large steady offset. The authentic resting eye = raw baseOffset for every mech.
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- **RESOLVED (2026-07-11): the PUNCH patches are the transparent WINDOWS.** Rendering every
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shell OFFLINE from its mech's AUTHORED eye (scratchpad/cop_eyeview.py, faces coloured by punch
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flag) showed the punch panes sitting exactly over the window apertures in all 8 mechs, with the
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visible frame = ONLY the non-punch geometry. The loader now DROPS the punch batches of `_cop`
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meshes (bgfload finish(), `BT_COP_KEEPPUNCH=1` keeps them for diag). In-game sweep on pure
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defaults, all 8 mechs [T2]: **madcat** = the dark dome frame (matches footage); **thor** =
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floating brace remnants (authentic; its frame bits are the small non-punch patches); **owens** =
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dash strip; **sunder** = two side pillars; **bhk1/loki/vulture/avatar** = authentically
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FRAMELESS (all-punch canopies — the pod showed no frame for those mechs). NOTE: an
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early-session in-game test "disproving" drop-punch ran with the broken pre-inverse eye — its
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conclusion was wrong and cost a detour; with the authentic eye the drop is plainly right.
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- **FINAL (2026-07-11, i860-firmware-decoded): PUNCH is a three-chunk STENCIL-CUT KIT.** The
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VREND.MNG board firmware's 'damageize' handler (@0xf040f6f8, disassembled with a custom i860
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tool) writes the dpl_Punchize token triple {dmg_set, undmg2enbl|texture, dmg_clear} onto the
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punch geogroup's first three geometry chunks IN FILE ORDER: chunk1 = the detailed
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window-aperture shapes = an invisible per-pixel MASK; chunk2 = the coarse HULL = the ONLY
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colour-drawn geometry, drawn where NOT masked; chunk3 = a byte-identical hull twin = the
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damage-reset record, never visible. The visible canopy = hull-minus-apertures. Port:
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bgfload identifies the within-patch twin pair (hull + skip) and tags the non-paired pmeshes as
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masks; L4D3D draws mask (stencil 1, no colour/z-write), hull (stencil-reject), mask (stencil 0)
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on a D24S8 device; the cut never touches z, so later-drawn entities show through apertures.
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BT_COP_PLATES=1 disables the kit (diag). In-game, all 8 mechs on pure defaults [T2]:
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connected dark frames with clear viewports; thor (the footage mech) shows the big central
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viewport + surrounding frame exactly as filmed. TWO earlier readings are superseded and were
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WRONG: "punch patches = windows, drop them" (left floating frame fragments) and "duplicate
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pairs = plates, hide both" (hid the HULL and drew the MASK = the inversion the user caught).
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- **Hit-bounce: LIVE and verified [T2] (2026-07-11).** The damage→gyro fan-out **FUN_004b2980**
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was re-disassembled byte-exact from the raw image (capstone; scratchpad/dis_4b2980.py) and
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reconstructed as `Gyroscope::ApplyDamageResponse` (gyro.cpp): zero-damage + Collision(0) no-op;
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@@ -56,7 +56,7 @@ reconciled via `CLASSMAP.md`, not the case label. [T1]
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| 0xBC1 | **Generator** | @4b… | power bus |
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| 0xBC2 | **PoweredSubsystem** | @004b0f74 | sizeof 0x31C |
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| 0xBC3 | **Sensor** | — | `case`=MyomersClassID |
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| 0xBC4 | **Gyroscope** | @004b3778 | DEFERRED (NaN integrator; reverted to stub) |
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| 0xBC4 | **Gyroscope** | @004b3778 | LIVE (task #56: byte-exact ctor/integrators/writers; hit-bounce fan-out wired) |
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| 0xBC5 | **Torso** | @004b6b0c | sizeof 0x280; `case`=SinkSource |
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| 0xBC6 | **Myomers** | @4b8fec | `case`=Actuator; INERT un-stub |
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| 0xBC8 | **Emitter** | @004b1d18 | sizeof 0x478; energy weapon |
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@@ -188,6 +188,14 @@ recoil @4bc136-4bc19c (damage>3 → (0,0.6,−1.5) × damage/16; `gyroRumbleTime
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ex-"clipLoadGuard"). Byte tooling: `scratchpad/dis_4b2980.py` / `dis_range.py` over
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`reference/decomp/section_dump.txt`.
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**PUNCH firmware decode** [T1] (the definitive mechanism, 2026-07-11): cmd 0x20 =
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vr_damage_action (VR_PROT.H enum); the i860 firmware content/VREND.MNG (code @0xf0400000)
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handler 'damageize' @0xf040f6f8 writes the token triple onto the geogroup's first THREE
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geometry-list nodes' geometry_type@+8 IN FILE ORDER (superlist appends at tail @0xf040c620);
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DPL_PRIV.H names the roles: f_t_dam(0x92)/sca(0x05)/undamage(0x04)/f_t_undam(0x17)/
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damage_set(0x03). Punchize triple = mask, hull, reset-twin -- the visible surface is the HULL
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with the MASK shapes stencil-cut through it. Disassembler: scratchpad/i860dis.py.
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**Cockpit-eye / punch addresses** [T1] (full story: [[cockpit-view]]): eye ctor
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**`FUN_004579a8`** (part_007.c:9274 = DPLEyeRenderable; offset = segment `GetBaseOffset`
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segment+0x74, parent = parent-segment DCS; caller part_014.c:5525-66 gates on `"siteeyepoint"`);
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@@ -200,6 +200,7 @@ d3d_OBJECT *d3d_OBJECT::LoadObject(LPDIRECT3DDEVICE9 device, char *fileName)
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}
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object->mDrawOps[i].drawAsSky = isSky;
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object->mDrawOps[i].copRole = 0;
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if (isSky)
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{
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@@ -430,6 +431,7 @@ d3d_OBJECT* d3d_OBJECT::LoadObjectBGF(LPDIRECT3DDEVICE9 device, char *fileName)
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static int s_punch = -1;
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if (s_punch < 0) { const char *pv = getenv("BT_PUNCH"); s_punch = (pv == 0 || pv[0] != '0') ? 1 : 0; }
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object->mDrawOps[i].punchThrough = (s_punch && data.batches[i].punch);
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object->mDrawOps[i].copRole = data.batches[i].copRole; // punch stencil-cut kit (task #55)
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object->mDrawOps[i].texture.texture = NULL;
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object->mDrawOps[i].texture.wrap_u = L4TEXOP::REPEAT;
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object->mDrawOps[i].texture.wrap_v = L4TEXOP::REPEAT;
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@@ -1112,6 +1114,11 @@ void d3d_OBJECT::DrawMesh(int pass, const D3DXMATRIX *viewTransform, Time target
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{
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L4DRAWOP *drawOp = &mDrawOps[iOp];
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// COCKPIT PUNCH KIT (task #55): aperture-MASK ops never draw colour --
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// they are consumed by the FOLLOWING hull op's stencil-cut sequence.
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if (drawOp->copRole == 1)
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continue;
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if (drawOp->alphaTest != (pass == PASS_ALPHABLEND))
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continue;
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@@ -1189,7 +1196,57 @@ void d3d_OBJECT::DrawMesh(int pass, const D3DXMATRIX *viewTransform, Time target
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}
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gNumBatches++;
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if (drawOp->bgfPrimCount > 0 && mBgfVB != NULL)
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// COCKPIT PUNCH STENCIL-CUT (task #55, the i860 'damageize' mechanism):
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// a role-2 HULL op is preceded by its role-1 aperture-MASK op. Sequence:
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// 1. draw the mask stencil-only (no colour, no z-write, z-TESTED) -> ref 1
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// 2. draw the hull with stencil-reject where ref==1 (the window cutouts)
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// 3. re-draw the mask writing stencil 0 (clean up for other punch groups)
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// The stencil never touches z, so entities drawn later still show through
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// the apertures correctly.
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const bool copCut = (drawOp->copRole == 2 && iOp > 0
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&& mDrawOps[iOp - 1].copRole == 1
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&& mDrawOps[iOp - 1].bgfPrimCount > 0
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&& drawOp->bgfPrimCount > 0 && mBgfVB != NULL);
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if (copCut)
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{
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L4DRAWOP *maskOp = &mDrawOps[iOp - 1];
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mDevice->SetFVF(L4VERTEX_FVF);
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mDevice->SetStreamSource(0, mBgfVB, 0, mBgfStride);
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mDevice->SetIndices(mBgfIB);
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// 1. mask -> stencil ref 1 (colour + z-write off)
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mDevice->SetRenderState(D3DRS_COLORWRITEENABLE, 0);
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mDevice->SetRenderState(D3DRS_ZWRITEENABLE, FALSE);
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mDevice->SetRenderState(D3DRS_STENCILENABLE, TRUE);
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mDevice->SetRenderState(D3DRS_STENCILFUNC, D3DCMP_ALWAYS);
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mDevice->SetRenderState(D3DRS_STENCILPASS, D3DSTENCILOP_REPLACE);
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mDevice->SetRenderState(D3DRS_STENCILREF, 1);
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mDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, mBgfNumVerts,
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maskOp->bgfStartIndex, maskOp->bgfPrimCount);
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// 2. hull, stencil-rejected under the mask
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mDevice->SetRenderState(D3DRS_COLORWRITEENABLE,
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D3DCOLORWRITEENABLE_RED | D3DCOLORWRITEENABLE_GREEN |
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D3DCOLORWRITEENABLE_BLUE | D3DCOLORWRITEENABLE_ALPHA);
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mDevice->SetRenderState(D3DRS_ZWRITEENABLE, TRUE);
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mDevice->SetRenderState(D3DRS_STENCILFUNC, D3DCMP_NOTEQUAL);
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mDevice->SetRenderState(D3DRS_STENCILPASS, D3DSTENCILOP_KEEP);
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mDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, mBgfNumVerts,
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drawOp->bgfStartIndex, drawOp->bgfPrimCount);
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// 3. mask again -> stencil ref 0 (clean)
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mDevice->SetRenderState(D3DRS_COLORWRITEENABLE, 0);
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mDevice->SetRenderState(D3DRS_ZWRITEENABLE, FALSE);
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mDevice->SetRenderState(D3DRS_STENCILFUNC, D3DCMP_ALWAYS);
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mDevice->SetRenderState(D3DRS_STENCILPASS, D3DSTENCILOP_REPLACE);
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mDevice->SetRenderState(D3DRS_STENCILREF, 0);
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mDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, mBgfNumVerts,
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maskOp->bgfStartIndex, maskOp->bgfPrimCount);
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// restore
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mDevice->SetRenderState(D3DRS_STENCILENABLE, FALSE);
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mDevice->SetRenderState(D3DRS_COLORWRITEENABLE,
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D3DCOLORWRITEENABLE_RED | D3DCOLORWRITEENABLE_GREEN |
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D3DCOLORWRITEENABLE_BLUE | D3DCOLORWRITEENABLE_ALPHA);
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mDevice->SetRenderState(D3DRS_ZWRITEENABLE, TRUE);
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}
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else if (drawOp->bgfPrimCount > 0 && mBgfVB != NULL)
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{
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// direct-draw: known contiguous range, no attribute-table scan.
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// (DrawSubset used to set the vertex decl itself -- assert the FVF here
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@@ -2779,7 +2779,7 @@ DPLRenderer::DPLRenderer(
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mPresentParams.PresentationInterval = D3DPRESENT_RATE_DEFAULT;
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mPresentParams.BackBufferFormat = D3DFMT_X8R8G8B8;
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mPresentParams.EnableAutoDepthStencil = TRUE;
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mPresentParams.AutoDepthStencilFormat = D3DFMT_D24X8;
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mPresentParams.AutoDepthStencilFormat = D3DFMT_D24S8; // S8: the cockpit punch stencil-cut (task #55)
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mPresentParams.Windowed = !fullscreen;
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if (fullscreen)
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{
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@@ -7421,7 +7421,7 @@ void DPLRenderer::ExecuteImplementation(RendererComplexity, RendererOrigin::Inte
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DWORD currentFog;
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mDevice->GetRenderState(D3DRS_FOGCOLOR, ¤tFog);
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hr = mDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, currentFog, 1.0f, 0);
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hr = mDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER | D3DCLEAR_STENCIL, currentFog, 1.0f, 0);
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hr = mDevice->BeginScene();
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+33
-17
@@ -504,7 +504,8 @@ struct Builder {
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bool currentTSphere = false; // material is tsphere_mtl (translocation warp): ramp it despite normals
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bool meshIsTSphere = false; // this OBJECT is the translocation warp -> smooth-tessellate the cone
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bool meshIsCop = false; // this OBJECT is a *_cop cockpit canopy shell (task #55)
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std::set<const void*> copPlateSkip; // duplicate damage-plate PMESHes to hide (see TAG_PATCH)
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std::map<const void*, int> copRoleMap; // punch-kit roles per PMESH chunk: 1=mask 2=hull 3=skip (see TAG_PATCH)
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int currentCopRole = 0; // role of the pmesh being built (consumed by buildPmesh)
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bool currentHasEmissive = false;
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float currentEmissive[3] = {0,0,0};
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@@ -734,6 +735,7 @@ struct Builder {
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batch.lodNear = currentLodNear;
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batch.lodFar = currentLodFar;
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batch.punch = currentPunch;
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batch.copRole = currentCopRole; // punch stencil-kit role (task #55)
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batch.shadowMat = currentShadowMat;
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batch.hasEmissive = currentHasEmissive;
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for (int i = 0; i < 3; ++i) batch.emissive[i] = currentEmissive[i];
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@@ -964,24 +966,24 @@ struct Builder {
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if (memcmp(s + i, "PUNCH", 5) == 0) currentPunch = true;
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if (currentPunch) break;
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}
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// COCKPIT DAMAGE-STATE PLATES (task #55, resolved 2026-07-11): every
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// *_cop PUNCH patch contains exactly one pair of BYTE-IDENTICAL
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// duplicate PMESHes -- solid cover plates for the tricoder per-triangle
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// damage machinery (dpl_Punchize tokens = {dmg_set, undmg2enbl|texture,
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// dmg_clear}; TRICODER.H), NOT visible undamaged structure. Rendering
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// them was the "solid black canopy"; hiding only whole punch patches
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// instead left disconnected floating frame bits. Hide the duplicate
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// pairs (both copies), render the rest of the punch lattice opaque --
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// verified from every mech's authored eye (SKL [jointeye]): all 8
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// cockpits read as CONNECTED frames with window apertures. Duplicates
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// are counted WITHIN the patch (BLX repeats its whole main lattice
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// ACROSS its three dz-material patches -- those must stay).
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// BT_COP_PLATES=1 renders the plates (diagnostic).
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// PUNCH STENCIL-CUT KIT (task #55, FINAL -- decoded from the i860
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// VREND.MNG firmware 'damageize' handler @0xf040f6f8 + the dpl_Punchize
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// token triple {dmg_set, undmg2enbl|texture, dmg_clear}): a PUNCH
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// patch's pmeshes are, in FILE ORDER, {aperture MASK, visible HULL,
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// byte-identical hull TWIN}. The board rasterizes the MASK as an
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// invisible per-pixel cutout, colour-draws ONLY the HULL where not
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// masked (= the canopy frame with the window apertures cut through),
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// and keeps the TWIN as the damage-reset record (never visible).
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// Identify the twin pair WITHIN the patch by content hash: pair FIRST
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// = the hull (role 2), pair SECOND = skipped; every non-paired pmesh
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// = the aperture mask (role 1; drawn stencil-only by L4D3D).
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// BT_COP_PLATES=1 disables the kit (all pmeshes draw plain, diag).
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if (meshIsCop && currentPunch) {
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static int s_plates = -1;
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if (s_plates < 0) { const char* e = getenv("BT_COP_PLATES"); s_plates = (e && e[0] != '0') ? 1 : 0; }
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if (!s_plates) {
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std::map<std::pair<size_t, uint64_t>, const Chunk*> seen;
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bool pairFound = false;
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for (const Chunk& ch : c.children) {
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if (ch.id != TAG_PMESH) continue;
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uint64_t h = 1469598103934665603ull; // FNV-1a
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@@ -990,12 +992,19 @@ struct Builder {
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auto it = seen.find(key);
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if (it == seen.end()) seen[key] = &ch;
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else {
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copPlateSkip.insert(&ch); copPlateSkip.insert(it->second);
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copRoleMap[it->second] = 2; // hull (first twin)
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copRoleMap[&ch] = 3; // reset record: never drawn
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pairFound = true;
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if (getenv("BT_COP_DUMP"))
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fprintf(stderr, "[cop] hid duplicate plate pair (pmesh len=%u)\n",
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fprintf(stderr, "[cop] punch kit: hull+twin pair (pmesh len=%u)\n",
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(unsigned)ch.len);
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}
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}
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if (pairFound)
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for (const Chunk& ch : c.children)
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if (ch.id == TAG_PMESH && !copRoleMap.count(&ch))
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copRoleMap[&ch] = 1; // aperture mask
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// no pair -> every pmesh stays role 0 (draw plain; unexpected shape)
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}
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}
|
||||
for (const Chunk& ch : c.children)
|
||||
@@ -1067,7 +1076,14 @@ struct Builder {
|
||||
for (int i = 0; i < 3; ++i) { currentRampLo[i] = savedRampLo[i]; currentRampHi[i] = savedRampHi[i]; }
|
||||
break;
|
||||
}
|
||||
case TAG_PMESH: if (copPlateSkip.count(&c)) break; buildPmesh(c); break;
|
||||
case TAG_PMESH: {
|
||||
auto rit = copRoleMap.find(&c);
|
||||
currentCopRole = (rit != copRoleMap.end()) ? rit->second : 0;
|
||||
if (currentCopRole == 3) { currentCopRole = 0; break; } // hull twin: never drawn
|
||||
buildPmesh(c);
|
||||
currentCopRole = 0;
|
||||
break;
|
||||
}
|
||||
default: for (const Chunk& ch : c.children) collect(ch); break;
|
||||
}
|
||||
}
|
||||
|
||||
@@ -61,6 +61,12 @@ struct BgfDrawBatch {
|
||||
// lattice: arena scaffold layers AR01-04, gratings). Drawn SOLID they
|
||||
// shingle near-coplanar over the massing = depth-shimmer "noisy surfaces".
|
||||
bool punch = false;
|
||||
// COCKPIT PUNCH STENCIL-CUT ROLES (task #55, decoded from the i860 VREND.MNG
|
||||
// firmware 'damageize' handler): a PUNCH patch's three pmeshes are, in file
|
||||
// order, {aperture MASK, visible HULL, hull twin (damage-reset record)}.
|
||||
// 0 = normal batch; 1 = aperture mask (stencil-only, no colour/z);
|
||||
// 2 = hull (drawn stencil-rejected under the mask = the window cutouts).
|
||||
int copRole = 0;
|
||||
// LAYER DEPTH BIAS (additive objects): the layers contain EXACTLY-COPLANAR
|
||||
// duplicated surfaces (flush wall patches between detail + massing). The
|
||||
// IG board resolved those deterministically (exact per-polygon plane
|
||||
|
||||
@@ -98,6 +98,10 @@ struct L4DRAWOP
|
||||
// black texels were loaded with alpha 0; draw with alpha TEST in the opaque pass
|
||||
// (z-write preserved), rejecting hole texels.
|
||||
bool punchThrough;
|
||||
// COCKPIT PUNCH STENCIL-CUT (task #55, i860-firmware-decoded): 0=normal,
|
||||
// 1=aperture MASK (drawn stencil-only, paired with the following hull op),
|
||||
// 2=HULL (drawn stencil-rejected under the mask = window cutouts).
|
||||
int copRole;
|
||||
// LAYER DEPTH BIAS (additive-LOD coplanar resolution; see bgfload.h): finer
|
||||
// layers get a slightly more negative normalized-depth bias so EXACTLY-
|
||||
// coplanar duplicated surfaces resolve to the detail layer instead of
|
||||
|
||||
Reference in New Issue
Block a user