Xash3D FWGS engine.
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/*
game.cpp -- executable to run Xash Engine
Copyright (C) 2011 Uncle Mike
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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.
*/
#include "port.h"
#include "build.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#if XASH_POSIX
#define XASHLIB "libxash." OS_LIB_EXT
#define LoadLibrary( x ) dlopen( x, RTLD_NOW )
#define GetProcAddress( x, y ) dlsym( x, y )
#define FreeLibrary( x ) dlclose( x )
#elif XASH_WIN32
#include <shellapi.h> // CommandLineToArgvW
#define XASHLIB "xash.dll"
#define SDL2LIB "SDL2.dll"
#define dlerror() GetStringLastError()
extern "C"
{
// Enable NVIDIA High Performance Graphics while using Integrated Graphics.
__declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
// Enable AMD High Performance Graphics while using Integrated Graphics.
__declspec(dllexport) int AmdPowerXpressRequestHighPerformance = 1;
}
#else
#error // port me!
#endif
#define E_GAME "XASH3D_GAME" // default env dir to start from
#define GAME_PATH "valve" // default dir to start from
typedef void (*pfnChangeGame)( const char *progname );
typedef int (*pfnInit)( int argc, char **argv, const char *progname, int bChangeGame, pfnChangeGame func );
typedef void (*pfnShutdown)( void );
static pfnInit Xash_Main;
static pfnShutdown Xash_Shutdown = NULL;
static char szGameDir[128]; // safe place to keep gamedir
static int szArgc;
static char **szArgv;
static HINSTANCE hEngine;
static void Xash_Error( const char *szFmt, ... )
{
static char buffer[16384]; // must support > 1k messages
va_list args;
va_start( args, szFmt );
vsnprintf( buffer, sizeof(buffer), szFmt, args );
va_end( args );
#if defined( _WIN32 )
MessageBoxA( NULL, buffer, "Xash Error", MB_OK );
#else
fprintf( stderr, "Xash Error: %s\n", buffer );
#endif
exit( 1 );
}
#ifdef _WIN32
static const char *GetStringLastError()
{
static char buf[1024];
FormatMessageA( FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(), MAKELANGID( LANG_ENGLISH, SUBLANG_DEFAULT ),
buf, sizeof( buf ), NULL );
return buf;
}
#endif
static void Sys_LoadEngine( void )
{
#if XASH_WIN32
HMODULE hSdl;
if (( hSdl = LoadLibraryEx( SDL2LIB, NULL, LOAD_LIBRARY_AS_DATAFILE )) == NULL )
{
Xash_Error("Unable to load the " SDL2LIB ": %s", dlerror() );
}
else
{
FreeLibrary( hSdl );
}
#endif
if(( hEngine = LoadLibrary( XASHLIB )) == NULL )
{
Xash_Error("Unable to load the " XASHLIB ": %s", dlerror() );
}
if(( Xash_Main = (pfnInit)GetProcAddress( hEngine, "Host_Main" )) == NULL )
{
Xash_Error( XASHLIB " missed 'Host_Main' export: %s", dlerror() );
}
// this is non-fatal for us but change game will not working
Xash_Shutdown = (pfnShutdown)GetProcAddress( hEngine, "Host_Shutdown" );
}
static void Sys_UnloadEngine( void )
{
if( Xash_Shutdown ) Xash_Shutdown( );
if( hEngine ) FreeLibrary( hEngine );
hEngine = NULL;
Xash_Main = NULL;
Xash_Shutdown = NULL;
}
static void Sys_ChangeGame( const char *progname )
{
// a1ba: may never be called within engine
// if platform supports execv() function
if( !progname || !progname[0] )
Xash_Error( "Sys_ChangeGame: NULL gamedir" );
if( Xash_Shutdown == NULL )
Xash_Error( "Sys_ChangeGame: missed 'Host_Shutdown' export\n" );
strncpy( szGameDir, progname, sizeof( szGameDir ) - 1 );
Sys_UnloadEngine();
Sys_LoadEngine ();
Xash_Main( szArgc, szArgv, szGameDir, 1, Sys_ChangeGame );
}
_inline int Sys_Start( void )
{
int ret;
pfnChangeGame changeGame = NULL;
const char *game = getenv( E_GAME );
if( !game )
game = GAME_PATH;
strncpy( szGameDir, game, sizeof( szGameDir ) - 1 );
Sys_LoadEngine();
if( Xash_Shutdown )
changeGame = Sys_ChangeGame;
ret = Xash_Main( szArgc, szArgv, szGameDir, 0, changeGame );
Sys_UnloadEngine();
return ret;
}
#if !XASH_WIN32
int main( int argc, char **argv )
{
szArgc = argc;
szArgv = argv;
return Sys_Start();
}
#else
int __stdcall WinMain( HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR cmdLine, int nShow )
{
LPWSTR* lpArgv;
int ret, i;
lpArgv = CommandLineToArgvW( GetCommandLineW(), &szArgc );
szArgv = ( char** )malloc( (szArgc + 1) * sizeof( char* ));
for( i = 0; i < szArgc; ++i )
{
size_t size = wcslen(lpArgv[i]) + 1;
// just in case, allocate some more memory
szArgv[i] = ( char * )malloc( size * sizeof( wchar_t ));
wcstombs( szArgv[i], lpArgv[i], size );
}
szArgv[szArgc] = 0;
LocalFree( lpArgv );
ret = Sys_Start();
for( ; i < szArgc; ++i )
free( szArgv[i] );
free( szArgv );
return ret;
}
#endif