engine: client: add definitions for borderless fullscreen mode

engine/client/ref_common.c

@@ -554,16 +554,12 @@ static void SetWidthAndHeightFromCommandLine( void )
 
 static void SetFullscreenModeFromCommandLine( void )
 {
-#if !XASH_MOBILE_PLATFORM
-	if( Sys_CheckParm( "-fullscreen" ))
-	{
+	if( Sys_CheckParm( "-borderless" ))
+		Cvar_DirectSet( &vid_fullscreen, "2" );
+	else if( Sys_CheckParm( "-fullscreen" ))
 		Cvar_DirectSet( &vid_fullscreen, "1" );
-	}
 	else if( Sys_CheckParm( "-windowed" ))
-	{
 		Cvar_DirectSet( &vid_fullscreen, "0" );
-	}
-#endif
 }
 
 static void R_CollectRendererNames( void )

engine/client/vid_common.c

@@ -30,7 +30,7 @@ static CVAR_DEFINE_AUTO( vid_scale, "1.0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "p
 
 CVAR_DEFINE_AUTO( vid_highdpi, "1",  FCVAR_RENDERINFO|FCVAR_VIDRESTART, "enable High-DPI mode" );
 CVAR_DEFINE_AUTO( vid_maximized, "0", FCVAR_RENDERINFO, "window maximized state, read-only" );
-CVAR_DEFINE( vid_fullscreen, "fullscreen", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "enable fullscren mode" );
+CVAR_DEFINE( vid_fullscreen, "fullscreen", "0", FCVAR_RENDERINFO|FCVAR_VIDRESTART, "fullscreen state (0 windowed, 1 fullscreen, 2 borderless)" );
 CVAR_DEFINE( window_xpos, "_window_xpos", "-1", FCVAR_RENDERINFO, "window position by horizontal" );
 CVAR_DEFINE( window_ypos, "_window_ypos", "-1", FCVAR_RENDERINFO, "window position by vertical" );
 
@@ -209,7 +209,7 @@ static void VID_Mode_f( void )
 		return;
 	}
 
-	R_ChangeDisplaySettings( w, h, !!vid_fullscreen.value );
+	R_ChangeDisplaySettings( w, h, bound( 0, vid_fullscreen.value, WINDOW_MODE_COUNT - 1 ));
 }
 
 void VID_Init( void )

engine/client/vid_common.h

@@ -9,6 +9,13 @@ typedef struct vidmode_s
 	int			height;
 } vidmode_t;
 
+typedef enum window_mode_e
+{
+	WINDOW_MODE_WINDOWED = 0,
+	WINDOW_MODE_FULLSCREEN,
+	WINDOW_MODE_BORDERLESS,
+	WINDOW_MODE_COUNT,
+} window_mode_t;
 
 typedef struct
 {
@@ -21,8 +28,6 @@ typedef struct
 	qboolean		initialized;	// OpenGL subsystem started
 	qboolean		extended;		// extended context allows to GL_Debug
 	qboolean        software;
-
-
 } glwstate_t;
 
 extern glwstate_t glw_state;