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#include <windows.h>

#include <d3d8.h>
#pragma comment(lib, "d3d8.lib")

typedef HRESULT (WINAPI* CreateDevice_Prototype) (LPDIRECT3D8, UINT, D3DDEVTYPE, HWND, DWORD, D3DPRESENT_PARAMETERS*, LPDIRECT3DDEVICE8*);
typedef HRESULT (WINAPI* Reset_Prototype) (LPDIRECT3DDEVICE8, D3DPRESENT_PARAMETERS*);
typedef HRESULT (WINAPI* EndScene_Prototype) (LPDIRECT3DDEVICE8);
typedef HRESULT (WINAPI* DrawIndexedPrimitive_Prototype)(LPDIRECT3DDEVICE8, D3DPRIMITIVETYPE, UINT, UINT, UINT, UINT);

CreateDevice_Prototype CreateDevice_Pointer = NULL;
Reset_Prototype Reset_Pointer = NULL;
EndScene_Prototype EndScene_Pointer = NULL;
DrawIndexedPrimitive_Prototype DrawIndexedPrimitive_Pointer = NULL;

HRESULT WINAPI Direct3DCreate8_VMTable (VOID);
HRESULT WINAPI CreateDevice_Detour (LPDIRECT3D8, UINT, D3DDEVTYPE, HWND, DWORD, D3DPRESENT_PARAMETERS*, LPDIRECT3DDEVICE8*);
HRESULT WINAPI Reset_Detour (LPDIRECT3DDEVICE8, D3DPRESENT_PARAMETERS*);
HRESULT WINAPI EndScene_Detour (LPDIRECT3DDEVICE8);
HRESULT WINAPI DrawIndexedPrimitive_Detour(LPDIRECT3DDEVICE8, D3DPRIMITIVETYPE, UINT, UINT, UINT, UINT);

PDWORD Direct3D_VMTable = NULL; 

BOOL WINAPI DllMain(HINSTANCE hinstModule, DWORD dwReason, LPVOID lpvReserved)
{
 if(dwReason == DLL_PROCESS_ATTACH)
 {
 DisableThreadLibraryCalls(hinstModule);

 if(Direct3DCreate8_VMTable() == D3D_OK)
 return TRUE;
 }

 return FALSE;
}

HRESULT WINAPI Direct3DCreate8_VMTable(VOID)
{
 LPDIRECT3D8 Direct3D_Object = Direct3DCreate8(D3D_SDK_VERSION);

 if(Direct3D_Object == NULL)
 return D3DERR_INVALIDCALL;
 
 Direct3D_VMTable = (PDWORD)*(PDWORD)Direct3D_Object;
 Direct3D_Object->Release();

 DWORD dwProtect;

 if(VirtualProtect(&Direct3D_VMTable[15], sizeof(DWORD), PAGE_READWRITE, &dwProtect) != 0)
 {
 *(PDWORD)&CreateDevice_Pointer = Direct3D_VMTable[15];
 *(PDWORD)&Direct3D_VMTable[15] = (DWORD)CreateDevice_Detour;

 if(VirtualProtect(&Direct3D_VMTable[15], sizeof(DWORD), dwProtect, &dwProtect) == 0)
 return D3DERR_INVALIDCALL;
 }
 else
 return D3DERR_INVALIDCALL;

 return D3D_OK;
}

HRESULT WINAPI CreateDevice_Detour(LPDIRECT3D8 Direct3D_Object, UINT Adapter, D3DDEVTYPE DeviceType, HWND FocusWindow, 
 DWORD BehaviorFlags, D3DPRESENT_PARAMETERS* PresentationParameters, 
 LPDIRECT3DDEVICE8* Returned_Device_Interface)
{
 HRESULT Returned_Result = CreateDevice_Pointer(Direct3D_Object, Adapter, DeviceType, FocusWindow, BehaviorFlags, 
 PresentationParameters, Returned_Device_Interface);

 DWORD dwProtect;

 if(VirtualProtect(&Direct3D_VMTable[15], sizeof(DWORD), PAGE_READWRITE, &dwProtect) != 0)
 {
 *(PDWORD)&Direct3D_VMTable[15] = *(PDWORD)&CreateDevice_Pointer;
 CreateDevice_Pointer = NULL;

 if(VirtualProtect(&Direct3D_VMTable[15], sizeof(DWORD), dwProtect, &dwProtect) == 0)
 return D3DERR_INVALIDCALL;
 }
 else
 return D3DERR_INVALIDCALL;

 if(Returned_Result == D3D_OK)
 {
 Direct3D_VMTable = (PDWORD)*(PDWORD)*Returned_Device_Interface;

 *(PDWORD)&Reset_Pointer = (DWORD)Direct3D_VMTable[14];
 *(PDWORD)&EndScene_Pointer = (DWORD)Direct3D_VMTable[35];
 *(PDWORD)&DrawIndexedPrimitive_Pointer = (DWORD)Direct3D_VMTable[71];

 *(PDWORD)&Direct3D_VMTable[14] = (DWORD)Reset_Detour;
 *(PDWORD)&Direct3D_VMTable[35] = (DWORD)EndScene_Detour;
 *(PDWORD)&Direct3D_VMTable[71] = (DWORD)DrawIndexedPrimitive_Detour;
 }
 
 return Returned_Result;
}

HRESULT WINAPI Reset_Detour(LPDIRECT3DDEVICE8 Device_Interface, D3DPRESENT_PARAMETERS* PresentationParameters)
{
 return Reset_Pointer(Device_Interface, PresentationParameters);
}

HRESULT WINAPI EndScene_Detour(LPDIRECT3DDEVICE8 Device_Interface)
{
 return EndScene_Pointer(Device_Interface);
}

HRESULT WINAPI DrawIndexedPrimitive_Detour(LPDIRECT3DDEVICE8 Device_Interface, D3DPRIMITIVETYPE Type, 
 UINT MinIndex, UINT NumVertices, UINT StartIndex, UINT PrimitiveCount)
{
 LPDIRECT3DVERTEXBUFFER8 Stream_Data;
 UINT Stride = 0;

 if(Device_Interface->GetStreamSource(0, &Stream_Data, &Stride) == D3D_OK)
 Stream_Data->Release();
 //code
 return DrawIndexedPrimitive_Pointer(Device_Interface, Type, MinIndex, NumVertices, StartIndex, PrimitiveCount); 

}