Direct3D 9 API Interceptor

This is a program that intercepts all Direct3D 9 (D3D9) commands issued by a running application. These commands are then dispatched to a separate program that interprets and responds to them. The commands can be forwarded to the operating system, discarded, or modified as desired.

Overview

The idea that enables this interception is that Direct3D (like most Windows APIs) is dynamically linked. Furthermore, Windows first searches for dynamic link libraries (DLLs) in the application's local directory. Therefore, to intercept calls to the D3D9 dynamic link library, d3d9.dll, all that is required is to make a custom version of d3d9.dll and put it in the application's local directory, which is exactly what this framework does. All intercepted calls are passed to a separate DLL, d3d9Callback.dll. This DLL decides what actions to take as a result of the command stream. It is also allowed to modify or discard the command stream before the interceptor sends it to the "real" version of d3d9.dll that was the intended target of these calls, which dispatches the commands to the graphics card.

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