* Add Sys_GLimpInit for platform specific GLimp initialisation

* Move Unix specific signal handlers to Sys_PlatformInit
* (Windows only) Don't set the SDL video driver if SDL_VIDEODRIVER is already
  set externally
* (Windows only) Use the "windib" SDL video driver if in_mouse is set to -1

code/sdl/sdl_glimp.c

@@ -416,7 +416,8 @@ static qboolean GLimp_StartDriverAndSetMode( int mode, qboolean fullscreen )
 
 		if (SDL_Init(SDL_INIT_VIDEO) == -1)
 		{
-			ri.Printf( PRINT_ALL, "SDL_Init FAILED (%s)\n", SDL_GetError());
+			ri.Printf( PRINT_ALL, "SDL_Init( SDL_INIT_VIDEO ) FAILED (%s)\n",
+					SDL_GetError());
 			return qfalse;
 		}
 
@@ -642,6 +643,8 @@ void GLimp_Init( void )
 
 	r_allowSoftwareGL = ri.Cvar_Get( "r_allowSoftwareGL", "0", CVAR_LATCH );
 
+	Sys_GLimpInit( );
+
 	// create the window and set up the context
 	if( !GLimp_StartDriverAndSetMode( r_mode->integer, r_fullscreen->integer ) )
 	{
@@ -679,8 +682,6 @@ void GLimp_Init( void )
 
 	// This depends on SDL_INIT_VIDEO, hence having it here
 	IN_Init( );
-
-	return;
 }
 
 

code/sys/sys_local.h

@@ -47,6 +47,7 @@ unsigned int CON_LogRead( char *out, unsigned int outSize );
 char *Sys_StripAppBundle( char *pwd );
 #endif
 
+void Sys_GLimpInit( void );
 void Sys_PlatformInit( void );
 void Sys_SigHandler( int signal );
 void Sys_ErrorDialog( const char *error );

code/sys/sys_main.c

@@ -551,16 +551,6 @@ int main( int argc, char **argv )
 
 	CON_Init( );
 
-#ifndef _WIN32
-	// Windows doesn't have these signals
-	// see CON_CtrlHandler() in con_win32.c
-	signal( SIGHUP, Sys_SigHandler );
-	signal( SIGQUIT, Sys_SigHandler );
-	signal( SIGTRAP, Sys_SigHandler );
-	signal( SIGIOT, Sys_SigHandler );
-	signal( SIGBUS, Sys_SigHandler );
-#endif
-
 	signal( SIGILL, Sys_SigHandler );
 	signal( SIGFPE, Sys_SigHandler );
 	signal( SIGSEGV, Sys_SigHandler );

code/sys/sys_unix.c

@@ -24,6 +24,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include "../qcommon/qcommon.h"
 #include "sys_local.h"
 
+#include <signal.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <errno.h>
@@ -512,6 +513,18 @@ void Sys_ErrorDialog( const char *error )
 	FS_FCloseFile( f );
 }
 
+/*
+==============
+Sys_GLimpInit
+
+Unix specific GL implementation initialisation
+==============
+*/
+void Sys_GLimpInit( void )
+{
+	// NOP
+}
+
 /*
 ==============
 Sys_PlatformInit
@@ -521,5 +534,9 @@ Unix specific initialisation
 */
 void Sys_PlatformInit( void )
 {
-	// NOP
+	signal( SIGHUP, Sys_SigHandler );
+	signal( SIGQUIT, Sys_SigHandler );
+	signal( SIGTRAP, Sys_SigHandler );
+	signal( SIGIOT, Sys_SigHandler );
+	signal( SIGBUS, Sys_SigHandler );
 }

code/sys/sys_win32.c

@@ -577,6 +577,40 @@ void Sys_ErrorDialog( const char *error )
 	}
 }
 
+#ifndef DEDICATED
+static qboolean SDL_VIDEODRIVER_externallySet = qfalse;
+#endif
+
+/*
+==============
+Sys_GLimpInit
+
+Windows specific GL implementation initialisation
+==============
+*/
+void Sys_GLimpInit( void )
+{
+#ifndef DEDICATED
+	if( !SDL_VIDEODRIVER_externallySet )
+	{
+		// It's a little bit weird having in_mouse control the
+		// video driver, but from ioq3's point of view they're
+		// virtually the same except for the mouse input anyway
+		if( Cvar_VariableIntegerValue( "in_mouse" ) == -1 )
+		{
+			// Use the windib SDL backend, which is closest to
+			// the behaviour of idq3 with in_mouse set to -1
+			_putenv( "SDL_VIDEODRIVER=windib" );
+		}
+		else
+		{
+			// Use the DirectX SDL backend
+			_putenv( "SDL_VIDEODRIVER=directx" );
+		}
+	}
+#endif
+}
+
 /*
 ==============
 Sys_PlatformInit
@@ -587,7 +621,15 @@ Windows specific initialisation
 void Sys_PlatformInit( void )
 {
 #ifndef DEDICATED
-	// Force the DirectX SDL backend to be used
-	_putenv( "SDL_VIDEODRIVER=directx" );
+	const char *SDL_VIDEODRIVER = getenv( "SDL_VIDEODRIVER" );
+
+	if( SDL_VIDEODRIVER )
+	{
+		Com_Printf( "SDL_VIDEODRIVER is externally set to \"%s\", "
+				"in_mouse -1 will have no effect\n", SDL_VIDEODRIVER );
+		SDL_VIDEODRIVER_externallySet = qtrue;
+	}
+	else
+		SDL_VIDEODRIVER_externallySet = qfalse;
 #endif
 }