mirror of
https://github.com/FunkyFr3sh/cnc-ddraw.git
synced 2025-03-15 22:14:49 +01:00
158 lines
4.1 KiB
C
158 lines
4.1 KiB
C
/*
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* Copyright (c) 2010 Toni Spets <toni.spets@iki.fi>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* This is a special mouse coordinate fix for games that use GetCursorPos and expect to be in fullscreen */
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#include <windows.h>
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#include <stdio.h>
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#include "main.h"
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#include "surface.h"
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#define MAX_NOPS 16
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struct game
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{
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DWORD check; /* memory address of one GetCursorPos call (for game identifying, 2E FF 15) */
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DWORD hook; /* memory address where the GetCursorPos call pointer is */
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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 */
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};
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struct game games[] =
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{
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/* Command & Conquer */
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{
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0x004C894A, /* address should contain 2E FF 15 */
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0x005B0184, /* GetCursorPos thunk addr */
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{
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0x004C88CC, /* ClipCursor */
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0x004C88E0, /* ClipCursor */
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0x0041114F, /* ShowCursor */
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0x00411198, /* ShowCursor */
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0x00454490, /* ShowCursor */
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0x004CCE62, /* SetCursor */
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0x00000000
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},
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},
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/* Red Alert */
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{
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0x005B39C0,
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0x005E6848,
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{
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0x005C194D, /* ClipCursor */
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0x005C196D, /* ClipCursor */
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0x004F83A0, /* ShowCursor */
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0x005B3A26, /* ShowCursor */
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0x005B3A73, /* ShowCursor */
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0x005A02CD, /* SetCursor */
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0x005A030A, /* SetCursor */
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0x005A0324, /* SetCursor */
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0x00000000
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},
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},
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{
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0x00000000,
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0x00000000,
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{
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0x00000000
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},
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},
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};
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BOOL WINAPI fake_GetCursorPos(LPPOINT lpPoint)
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{
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lpPoint->x = ddraw->cursor.x;
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lpPoint->y = ddraw->cursor.y;
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return TRUE;
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}
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BOOL mouse_active = FALSE;
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void mouse_lock()
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{
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if(mouse_active && !ddraw->locked)
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{
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ddraw->locked = TRUE;
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ClipCursor(&ddraw->cursorclip);
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while(ShowCursor(FALSE) > 0);
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SetEvent(ddraw_primary->flipEvent);
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}
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}
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void mouse_unlock()
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{
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if(!mouse_active)
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{
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return;
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}
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if(ddraw->locked)
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{
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ShowCursor(TRUE);
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}
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ddraw->locked = FALSE;
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ClipCursor(NULL);
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ddraw->cursor.x = ddraw->width / 2;
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ddraw->cursor.y = ddraw->height / 2;
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if(ddraw_primary)
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{
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SetEvent(ddraw_primary->flipEvent);
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}
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}
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void mouse_init(HWND hWnd)
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{
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DWORD tmp;
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HANDLE hProcess;
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DWORD dwWritten;
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int i;
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unsigned char buf[7];
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GetWindowThreadProcessId(hWnd, &tmp);
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hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, tmp);
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tmp = (DWORD)fake_GetCursorPos;
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struct game *ptr = &games[0];
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while(ptr->check)
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{
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ReadProcessMemory(hProcess, (void *)ptr->check, buf, 3, &dwWritten);
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if(buf[0] == 0x2E && buf[1] == 0xFF && buf[2] == 0x15)
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{
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WriteProcessMemory(hProcess, (void *)ptr->hook, &tmp, 4, &dwWritten);
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memset(buf, 0x90, 7); // NOP
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buf[0] = 0x58; // POP EAX
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buf[1] = 0x33; // XOR EAX,EAX
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buf[2] = 0xC0; // ^
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for(i=0;i<MAX_NOPS;i++)
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{
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if(!ptr->nops[i])
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break;
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WriteProcessMemory(hProcess, (void *)ptr->nops[i], buf, 7, &dwWritten);
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}
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mouse_active = TRUE;
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return;
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}
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ptr++;
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}
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}
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