DIP midfunction hook

DWORD dwDrawIndexedPrimitive_EngineCall = 0x006A3AEA;
DWORD dwDrawIndexedPrimitive_CaveJumpBack = dwDrawIndexedPrimitive_EngineCall + 0x8;

__declspec(naked) void __cdecl DrawIndexedPrimitive_CodeCave()
{
    static LPDIRECT3DDEVICE9 pDevice;
    static D3DPRIMITIVETYPE PrimType = D3DPT_TRIANGLELIST; //constant parameter 4
    static UINT MinIndex, nNumVertices, StartIndex, nPrimitiveCount;
    static INT BaseVertexIndex;
    
    __asm
    {
        MOV ECX, DWORD PTR DS:[EAX]
        MOV pDevice, EAX; 
        MOV EDX, DWORD PTR DS:[ECX+0x148]
        PUSHAD
        MOV ECX, [EBP + 0x18]
        MOV BaseVertexIndex, ECX 
        MOV ECX, [EBP + 0x8]
        MOV MinIndex, ECX      
        MOV ECX, [EBP + 0x10]
        MOV nNumVertices, ECX  
        MOV ECX, [EBP + 0xC]
        MOV StartIndex, ECX    
        MOV ECX, [EBP + 0x14]
        MOV nPrimitiveCount, ECX
    }


    //Second DIP call
    pDevice->DrawIndexedPrimitive(PrimType, BaseVertexIndex,  MinIndex, nNumVertices, StartIndex, nPrimitiveCount);


    __asm
    {
        POPAD
        JMP dwDrawIndexedPrimitive_CaveJumpBack;
    }
}

DWORD CALLBACK DIPHook(LPVOID)
{
    while(1)
    {    
        if(*(int*)0x377B11B0 == 1)
            DetourCreate((PBYTE)dwDrawIndexedPrimitive_EngineCall, (PBYTE)DrawIndexedPrimitive_CodeCave, 8);
        else
            memcpy((void*)dwDrawIndexedPrimitive_EngineCall, (PBYTE)"\x8B\x08\x8B\x91\x48\x01\x00\x00", 8);

        Sleep(500);
    }

    return 0;
}

CreateThread(NULL, NULL, DIPHook, NULL, NULL, NULL);