/* * Copyright (c) 2010 Toni Spets * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* This is a special mouse coordinate fix for games that use GetCursorPos and expect to be in fullscreen */ #include #include #include "main.h" #include "surface.h" #define MAX_NOPS 16 struct game { DWORD check; /* memory address of one GetCursorPos call (for game identifying, 2E FF 15) */ DWORD hook; /* memory address where the GetCursorPos call pointer is */ DWORD nops[MAX_NOPS]; /* points where a 1+7 byte import call is NOP'd (ClipCursor, ShowCursor), first byte is a PUSH that has to be removed */ }; struct game games[] = { /* Command & Conquer */ { 0x004C894A, /* address should contain 2E FF 15 */ 0x005B0184, /* GetCursorPos thunk addr */ { 0x004C88CC, /* ClipCursor */ 0x004C88E0, /* ClipCursor */ 0x0041114F, /* ShowCursor */ 0x00411198, /* ShowCursor */ 0x00454490, /* ShowCursor */ 0x004CCE62, /* SetCursor */ 0x00000000 }, }, /* Red Alert */ { 0x005B39C0, 0x005E6848, { 0x005C194D, /* ClipCursor */ 0x005C196D, /* ClipCursor */ 0x004F83A0, /* ShowCursor */ 0x005B3A26, /* ShowCursor */ 0x005B3A73, /* ShowCursor */ 0x005A02CD, /* SetCursor */ 0x005A030A, /* SetCursor */ 0x005A0324, /* SetCursor */ 0x00000000 }, }, { 0x00000000, 0x00000000, { 0x00000000 }, }, }; BOOL WINAPI fake_GetCursorPos(LPPOINT lpPoint) { lpPoint->x = ddraw->cursor.x; lpPoint->y = ddraw->cursor.y; return TRUE; } BOOL mouse_active = FALSE; void mouse_lock() { if(mouse_active && !ddraw->locked) { ddraw->locked = TRUE; ClipCursor(&ddraw->cursorclip); while(ShowCursor(FALSE) > 0); SetEvent(ddraw_primary->flipEvent); } } void mouse_unlock() { if(!mouse_active) { return; } if(ddraw->locked) { ShowCursor(TRUE); } ddraw->locked = FALSE; ClipCursor(NULL); ddraw->cursor.x = ddraw->width / 2; ddraw->cursor.y = ddraw->height / 2; if(ddraw_primary) { SetEvent(ddraw_primary->flipEvent); } } void mouse_init(HWND hWnd) { DWORD tmp; HANDLE hProcess; DWORD dwWritten; int i; unsigned char buf[7]; GetWindowThreadProcessId(hWnd, &tmp); hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, tmp); tmp = (DWORD)fake_GetCursorPos; struct game *ptr = &games[0]; while(ptr->check) { ReadProcessMemory(hProcess, (void *)ptr->check, buf, 3, &dwWritten); if(buf[0] == 0x2E && buf[1] == 0xFF && buf[2] == 0x15) { WriteProcessMemory(hProcess, (void *)ptr->hook, &tmp, 4, &dwWritten); memset(buf, 0x90, 7); // NOP buf[0] = 0x58; // POP EAX buf[1] = 0x33; // XOR EAX,EAX buf[2] = 0xC0; // ^ for(i=0;inops[i]) break; WriteProcessMemory(hProcess, (void *)ptr->nops[i], buf, 7, &dwWritten); } mouse_active = TRUE; return; } ptr++; } }