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openDecal/NewNativeStubs/DecalRender/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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DecalRender.DLL

Origin

Factored out of the old Inject.DLL — the rendering functionality (texture creation, font rendering, surface blitting) that previously lived inside Inject was moved into this dedicated COM server.

Binary Facts

  • Size: 108 KB
  • 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 D3DXCreateTexture, D3DXLoadSurfaceFromMemory, D3DXCreateFontW, and others

What It Does

Provides the 2D rendering layer for Decal's overlay UI — creating textures, loading surfaces from memory, and drawing text with DirectX fonts. Inject.DLL hooks the Direct3D scene begin/end, and DecalRender plugs into those hooks to draw.

Reconstruction Notes

  • LOOK AT: Managed/Decal.Interop.Render/ for the COM interface definitions this DLL must implement. That directory contains 19 decompiled C# files describing every interface, enum, and coclass.
  • LOOK AT: The old Native/Inject/ source for rendering code that was likely moved here. Search for anything that touches IDirect3DTexture9, ID3DXFont, surface blitting, etc.
  • The interop assembly will define the exact vtable layout the managed side expects. Every COM interface in Decal.Interop.Render maps to an interface this DLL exposes.