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openDecal/NewNativeStubs/D3DService/NOTES.md
erik d1442e3747 Initial commit: Complete open-source Decal rebuild 
All 5 phases of the open-source Decal rebuild:

Phase 1: 14 decompiled .NET projects (Interop.*, Adapter, FileService, DecalUtil)
Phase 2: 10 native DLLs rewritten as C# COM servers with matching GUIDs
  - DecalDat, DHS, SpellFilter, DecalInput, DecalNet, DecalFilters
  - Decal.Core, DecalControls, DecalRender, D3DService
Phase 3: C++ shims for Inject.DLL (D3D9 hooking) and LauncherHook.DLL
Phase 4: DenAgent WinForms tray application
Phase 5: WiX installer and build script

25 C# projects building with 0 errors.
Native C++ projects require VS 2022 + Windows SDK (x86).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-08 18:27:56 +01:00

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D3DService.DLL

Origin

Entirely new — no corresponding code in the old source tree. Provides a higher-level 3D graphics API that plugins can use to render 3D objects in the game world (meshes, 3D text, transformed geometry).

Binary Facts

  • Size: 262 KB (the largest of the new native modules)
  • Type: COM in-process server (DLL)
  • Standard 4 COM exports: DllCanUnloadNow, DllGetClassObject, DllRegisterServer, DllUnregisterServer

Key Imports

DLL Functions
Inject.DLL BeginSceneO, EndSceneO
d3dx9_30.dll D3DXCreateRenderToSurface, D3DXLoadMeshFromXResource, D3DXLoadMeshFromXW, D3DXCreateTextW, D3DXMatrixTranslation, D3DXMatrixRotationY, and others

What It Does

  • Loads .x mesh files (from resources or from disk)
  • Creates 3D text geometry
  • Performs matrix transforms (translation, rotation)
  • Renders to off-screen surfaces
  • Essentially a "3D drawing toolkit" layered on top of Inject's scene hooks

Reconstruction Notes

  • LOOK AT: Managed/Decal.Interop.D3DService/ for the COM interface definitions this DLL must implement. That directory contains 8 decompiled C# files.
  • There is no old source to reference. This must be reimplemented from:
    1. The COM interfaces defined in the interop assembly
    2. Knowledge of the D3DX9 API calls it makes
    3. Understanding of how BeginSceneO/EndSceneO work (see Native/Inject/)
  • This is the most complex new module to reconstruct due to its size and the lack of any prior source code.