So recently I wanted to add an imgui interface to an example window using DirectX, so I watched on a video I had to hook the EndScene function using DirectX9sdk to be able to add my custom imgui interface.
However I have some questions:
- Where can I find any documentation for the DirectX9 functions and types,( if there is any, because I do not understand why we specifically have to hook the EndScene function) or where could I find any article explaining more in depth how directX works?
- I've seen two version so far of EndScene hooks one with a patternScanning function which scans a signature in the shaderapi dll and another which creates a DirectXDevice and then accesses the vtable from there; are there any sources online, or is it something we have to do ourselves? Here is the version I have:
while (!DirectXDevice) // loops until it finds the device
DirectXDevice = **(DWORD**)(FindPattern("shaderapidx9.dll", "A1 ?? ?? ?? ?? 50 8B 08 FF 51 0C") + 0x1);
void** pVTable = *reinterpret_cast<void***>(DirectXDevice); // getting the vtable array
oEndScene = (f_EndScene)DetourFunction((PBYTE)pVTable[42], (PBYTE)Hooked_EndScene)//getting the 42th virtual function and detouring it to our own
- I don't really understand what __stdcall does here, I do know it is used to call WINAPI functions but what for here?
HRESULT __stdcall Hooked_EndScene(IDirect3DDevice9* pDevice){//some code}
Note: thats the function I hook to the original endscene.
Thank you really much, I'm sorry if there are alot of questions but I really can't wrap my head around this.