addTexture

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#define patch(a, v, s) _patch((void*)(a), (DWORD)(v), (s))

BOOL APIENTRY DllMain(HMODULE, DWORD, LPVOID);
void _patch(void*,DWORD,DWORD);
void LoadCustomParticle(void);
void DestroyCustomParticle(void);
DWORD* _textLampShad64 = (DWORD*)0xC4040C;
DWORD* _RwTTailight = (DWORD*)0xC403E8;
const char aTailName[] = "shad_exp";

BOOL APIENTRY DllMain(HMODULE hModule, DWORD reason, LPVOID lpReserved)
{
    if(reason==DLL_PROCESS_ATTACH)
    {
        patch(0x706DA6, 0xE9, 1);
        patch(0x706DA7, (DWORD)&LoadCustomParticle - 0x706DAB, 4);
        patch(0x706F5C, 0xE9, 1);
        patch(0x706F5D, (DWORD)&DestroyCustomParticle - 0x706F61, 4);
    }
    return TRUE;
}

void _patch(void* pAddress, DWORD data, DWORD iSize)
{
    unsigned long dwProtect[2];
    VirtualProtect(pAddress, iSize, PAGE_EXECUTE_READWRITE, &dwProtect[0]);
    switch(iSize)
    {
            case 1: *(BYTE*)pAddress = (BYTE)data;
                break;
            case 2: *(WORD*)pAddress = (WORD)data;
                break;
            case 4: *(DWORD*)pAddress = (DWORD)data;
                break;
            default: memset(pAddress, data, iSize);
                break;
    }
    VirtualProtect(pAddress, iSize, dwProtect[0], &dwProtect[1]);
}

void __declspec(naked) LoadCustomParticle()
{
    _asm
    {
        mov     _textLampShad64, eax
        push    ebx
        push    offset aTailName
        mov     eax, 7F3AC0h
        call    eax
        mov     _RwTTailight, eax
        add     esp, 30h
        mov     eax, 706DAEh
        jmp     eax
    }
}

void __declspec(naked) DestroyCustomParticle()
{
    _asm
    {
        mov     eax, _RwTTailight
        push    eax
        mov     ecx, 7F3820h
        call    ecx
        add     esp, 34h
        ret
    }
}