Serious-Engine/Sources/Engine/Graphics/MultiMonitor.cpp

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/* Copyright (c) 2002-2012 Croteam Ltd.
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License as published by
the Free Software Foundation
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */
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#include "Engine/StdH.h"
#ifdef PLATFORM_WIN32
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#include <tchar.h>
#endif
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#include <Engine/Graphics/MultiMonitor.h>
#include <Engine/Base/Console.h>
#include <Engine/Base/ErrorReporting.h>
#include <Engine/Base/Translation.h>
// Win9x multimonitor enabling/disabling code,
// idea and original code courtesy of Christian Studer <cstuder@realtimesoft.com>
// added dynamic function loading and exception throwing
extern INDEX gfx_bDisableMultiMonSupport;
extern INDEX gfx_ctMonitors;
extern INDEX gfx_bMultiMonDisabled;
#ifdef PLATFORM_WIN32
#pragma comment(lib, "advapi32.lib")
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typedef BOOL EnumDisplayDevices_t(
PVOID Unused, // not used; must be NULL
DWORD iDevNum, // specifies display device
PDISPLAY_DEVICE lpDisplayDevice, // pointer to structure to
// receive display device information
DWORD dwFlags // flags to condition function behavior
);
typedef LONG ChangeDisplaySettingsEx_t(
LPCSTR lpszDeviceName,
LPDEVMODE lpDevMode,
HWND hwnd,
DWORD dwflags,
LPVOID lParam
);
static HINSTANCE _hUser32Lib = NULL;
static EnumDisplayDevices_t *_pEnumDisplayDevices = NULL;
static ChangeDisplaySettingsEx_t *_pChangeDisplaySettingsEx = NULL;
// disables or enables secondary monitors on Win98/Me
void Mon_DisableEnable9x_t(BOOL bDisable)
{
// load user32
if (_hUser32Lib==NULL) {
_hUser32Lib = ::LoadLibraryA( "user32.dll");
if( _hUser32Lib == NULL) {
ThrowF_t(TRANS("Cannot load user32.dll."));
}
}
if (_pEnumDisplayDevices==NULL) {
_pEnumDisplayDevices = (EnumDisplayDevices_t*)GetProcAddress(_hUser32Lib, "EnumDisplayDevicesA");
if (_pEnumDisplayDevices==NULL) {
ThrowF_t(TRANS("Cannot find EnumDisplayDevices()."));
}
}
if (_pChangeDisplaySettingsEx==NULL) {
_pChangeDisplaySettingsEx = (ChangeDisplaySettingsEx_t*)GetProcAddress(_hUser32Lib, "ChangeDisplaySettingsExA");
if (_pChangeDisplaySettingsEx==NULL) {
ThrowF_t(TRANS("Cannot find ChangeDisplaySettingsEx()."));
}
}
HKEY key;
LONG ret = RegOpenKeyEx(HKEY_CURRENT_CONFIG, _T("Display\\Settings"), 0, KEY_ENUMERATE_SUB_KEYS |
KEY_SET_VALUE, &key);
if (ret != ERROR_SUCCESS) {
ThrowF_t(TRANS("Cannot enumerate display settings from registry\n"));
}
TCHAR attach[2];
if (bDisable)
lstrcpy(attach, _T("0"));
else
lstrcpy(attach, _T("1"));
// enumerate all subkeys. there is at least one subkey for each secondary monitor, maybe more.
DWORD index = 0;
while (ret == ERROR_SUCCESS)
{
TCHAR keyName[500];
DWORD keyNameSize = 500;
ret = RegEnumKeyEx(key, index, keyName, &keyNameSize, 0, 0, 0, 0);
if (ret == ERROR_SUCCESS)
{
// open the subkey and set the AttachToDesktop value (0 or 1)
HKEY subKey;
ret = RegOpenKeyEx(key, keyName, 0, KEY_SET_VALUE, &subKey);
if (ret == ERROR_SUCCESS)
{
ret = RegSetValueEx(subKey, _T("AttachToDesktop"), 0, REG_SZ,
reinterpret_cast<const BYTE*>(attach), sizeof(TCHAR) * 2);
RegCloseKey(subKey);
++index;
}
}
}
RegCloseKey(key);
bool failed = FALSE;
DWORD dev = 0;
DISPLAY_DEVICE dd;
dd.cb = sizeof(dd);
while (_pEnumDisplayDevices(0, dev, &dd, 0))
{
if (!(dd.StateFlags & DISPLAY_DEVICE_MIRRORING_DRIVER) && !(dd.StateFlags & DISPLAY_DEVICE_PRIMARY_DEVICE))
{
// this is a secondary monitor, change display settings to what's currently stored in the registry
ret = _pChangeDisplaySettingsEx((const char*)dd.DeviceName, 0, 0, 0, 0);
// we get DISP_CHANGE_BADPARAM if we try to set settings for a monitor that doesn't exist
if (ret != DISP_CHANGE_SUCCESSFUL && ret != DISP_CHANGE_BADPARAM)
failed = TRUE;
}
dev++;
}
if (failed) {
ThrowF_t(TRANS("Cannot change settings for at least one secondary monitor\n"));
}
}
#endif
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void MonitorsOff(void)
{
extern BOOL _bDedicatedServer;
if (_bDedicatedServer) {
return;
}
#ifdef PLATFORM_WIN32
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// check for WinNT or Win2k
BOOL bNT = FALSE;
OSVERSIONINFO osv;
memset(&osv, 0, sizeof(osv));
osv.dwOSVersionInfoSize = sizeof(osv);
if (GetVersionEx(&osv) && osv.dwPlatformId==VER_PLATFORM_WIN32_NT) {
bNT = TRUE;
}
// if there is more than one monitor, and OS is not WinNT
if (gfx_ctMonitors>1 && !bNT) {
CPrintF(TRANSV("Multimonitor configuration detected...\n"));
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// if multimon is not allowed
if (gfx_bDisableMultiMonSupport) {
CPrintF(TRANSV(" Multimonitor support disallowed.\n"));
CPrintF(TRANSV(" Disabling multimonitor..."));
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// disable all but primary
try {
Mon_DisableEnable9x_t(/*bDisable = */ TRUE);
CPrintF(TRANSV(" disabled\n"));
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} catch(char *strError) {
CPrintF(TRANSV(" error: %s\n"), strError);
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}
gfx_bMultiMonDisabled = TRUE;
// if multimon is allowed
} else {
CPrintF(TRANSV(" Multimonitor support was allowed.\n"));
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}
}
#else
CPrintF(TRANSV("Multimonitor is not supported on this platform.\n"));
#endif
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}
void MonitorsOn(void)
{
#ifdef PLATFORM_WIN32
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// if multimon was disabled
if (gfx_bMultiMonDisabled) {
CPrintF(TRANSV("Multimonitor support was disabled.\n"));
CPrintF(TRANSV(" re-enabling multimonitor..."));
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// enable all secondary
try {
Mon_DisableEnable9x_t(/*bDisable = */ FALSE);
CPrintF(TRANSV(" enabled\n"));
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} catch(char *strError) {
CPrintF(TRANSV(" error: %s\n"), strError);
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}
}
#else
CPrintF(TRANSV("Multimonitor is not supported on this platform.\n"));
#endif
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}