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Cockpit: the authentic punch STENCIL-CUT -- all 8 cockpits real (task #55)

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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
2026-07-11 08:53:22 -05:00
co-authored by Claude Fable 5
parent 8431e69b1a
commit 96b8892e7c
8 changed files with 136 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files
engine/MUNGA_L4/L4VIDEO.cpp
+2 -2
View File
@@ -2779,7 +2779,7 @@ DPLRenderer::DPLRenderer(
mPresentParams.PresentationInterval = D3DPRESENT_RATE_DEFAULT;
mPresentParams.BackBufferFormat = D3DFMT_X8R8G8B8;
mPresentParams.EnableAutoDepthStencil = TRUE;
mPresentParams.AutoDepthStencilFormat = D3DFMT_D24X8;
mPresentParams.AutoDepthStencilFormat = D3DFMT_D24S8; // S8: the cockpit punch stencil-cut (task #55)
mPresentParams.Windowed = !fullscreen;
if (fullscreen)
{
@@ -7421,7 +7421,7 @@ void DPLRenderer::ExecuteImplementation(RendererComplexity, RendererOrigin::Inte
DWORD currentFog;
mDevice->GetRenderState(D3DRS_FOGCOLOR, &currentFog);
hr = mDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, currentFog, 1.0f, 0);
hr = mDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER | D3DCLEAR_STENCIL, currentFog, 1.0f, 0);
hr = mDevice->BeginScene();