engine: client: vgui: add funcs for VGUI2 support to the new API, change VGui_Startup to include VGUI2 initialization

engine/client/cl_game.c

@@ -3922,7 +3922,7 @@ qboolean CL_LoadProgs( const char *name )
 	// during LoadLibrary
 	if( !GI->internal_vgui_support && VGui_LoadProgs( NULL ))
 	{
-		VGui_Startup( refState.width, refState.height );
+		VGui_Startup( NULL, refState.width, refState.height );
 	}
 	else
 	{
@@ -3938,7 +3938,8 @@ qboolean CL_LoadProgs( const char *name )
 	// delayed vgui initialization for internal support
 	if( GI->internal_vgui_support && VGui_LoadProgs( clgame.hInstance ))
 	{
-		VGui_Startup( refState.width, refState.height );
+		// do not pass client pointer yet
+		VGui_Startup( NULL, refState.width, refState.height );
 	}
 
 	// clear exports
@@ -4021,6 +4022,9 @@ qboolean CL_LoadProgs( const char *name )
 		return false;
 	}
 
+	// try to load VGUI2
+	VGui_Startup( clgame.hInstance, refState.width, refState.height );
+
 	Cvar_FullSet( "host_clientloaded", "1", FCVAR_READ_ONLY );
 
 	clgame.maxRemapInfos = 0; // will be alloc on first call CL_InitEdicts();

engine/client/cl_scrn.c

@@ -715,7 +715,9 @@ void SCR_VidInit( void )
 	// notify vgui about screen size change
 	if( clgame.hInstance )
 	{
-		VGui_Startup( refState.width, refState.height );
+		// do not pass client pointer, we do not want to
+		// re-initialize vgui2
+		VGui_Startup( NULL, refState.width, refState.height );
 	}
 
 	CL_ClearSpriteTextures(); // now all hud sprites are invalid

engine/client/vgui/vgui_draw.c

@@ -117,6 +117,9 @@ static vgui_support_api_t gEngfuncs =
 	Platform_GetClipboardText,
 	Platform_SetClipboardText,
 	Platform_GetKeyModifiers,
+	COM_LoadLibrary,
+	COM_FreeLibrary,
+	COM_GetProcAddress,
 };
 
 static void VGui_FillAPIFromRef( vgui_support_api_t *to, const ref_interface_t *from )
@@ -175,7 +178,7 @@ static qboolean VGui_ProbeNewAPI( HINSTANCE hInstance,
 	vgui_support_interface_t *iface, const vgui_support_api_t *api )
 {
 	const int version = VGUI_SUPPORT_API_VERSION;
-	vgui_support_api_t localapi;
+	static vgui_support_api_t localapi;
 	VGUISUPPORTAPI F;
 
 	F = COM_GetProcAddress( hInstance, GET_VGUI_SUPPORT_API );
@@ -287,7 +290,7 @@ VGui_Startup
 
 ================
 */
-void VGui_Startup( int width, int height )
+void VGui_Startup( HINSTANCE clientInstance, int width, int height )
 {
 	// vgui not initialized from both support and client modules, skip
 	if( !vgui.initialized )
@@ -302,12 +305,18 @@ void VGui_Startup( int width, int height )
 	else if( width <= 1280 ) width = 1280;
 	else if( width <= 1600 ) width = 1600;
 
-	if( vgui.dllFuncs.Startup )
+	if( !clientInstance )
-		vgui.dllFuncs.Startup( width, height );
+	{
+		if( vgui.dllFuncs.Startup )
+			vgui.dllFuncs.Startup( width, height );
+	}
+	else
+	{
+		if( vgui.dllFuncs.ClientStartup )
+			vgui.dllFuncs.ClientStartup( clientInstance, width, height );
+	}
 }
 
-
-
 /*
 ================
 VGui_Shutdown

engine/client/vgui/vgui_draw.h

@@ -21,7 +21,7 @@ GNU General Public License for more details.
 //
 void VGui_RegisterCvars( void );
 qboolean VGui_LoadProgs( HINSTANCE hInstance );
-void VGui_Startup( int width, int height );
+void VGui_Startup( HINSTANCE clientInstance, int width, int height );
 void VGui_Shutdown( void );
 void VGui_Paint( void );
 void VGui_RunFrame( void );

engine/vgui_api.h

@@ -209,10 +209,13 @@ typedef void (*LEGACY_VGUISUPPORTAPI)( legacy_vguiapi_t * );
 #define LEGACY_GET_VGUI_SUPPORT_API "InitAPI"
 #define LEGACY_CLIENT_GET_VGUI_SUPPORT_API "InitVGUISupportAPI"
 
+#define vguiapi_t legacy_vguiapi_t
+
 #endif // ENABLE_LEGACY_API_SUPPORT
 
 typedef struct vgui_support_api_s
 {
+	// LEGACY COMPATIBLE FUNCTIONS
 	void	(*DrawInit)( void );
 	void	(*DrawShutdown)( void );
 	void	(*SetupDrawingText)( int *pColor );
@@ -236,10 +239,17 @@ typedef struct vgui_support_api_s
 	int		(*GetClipboardText)( char *buffer, size_t bufferSize );
 	void	(*SetClipboardText)( const char *text );
 	key_modifier_t (*GetKeyModifiers)( void );
+	// END OF LEGACY COMPATIBLE FUCNTIONS
+	// DON'T BREAK ABI, ONLY ADD NEW FUNCTIONS TO THE END OF STRUCTURE
+
+	void	*(*LoadLibrary)( const char *dllname, int build_ordinals_table, qboolean directpath );
+	void 	(*FreeLibrary)( void *hInstance );
+	void 	*(*GetProcAddress)( void *hInstance, const char *name );
 } vgui_support_api_t;
 
 typedef struct vgui_support_interface_s
 {
+	// LEGACY COMPATIBLE FUNCTIONS
 	void	(*Startup)( int width, int height );
 	void	(*Shutdown)( void );
 	void	*(*GetPanel)( void );
@@ -248,6 +258,11 @@ typedef struct vgui_support_interface_s
 	void	(*Key)( enum VGUI_KeyAction action, enum VGUI_KeyCode code );
 	void	(*MouseMove)( int x, int y );
 	void	(*TextInput)( const char *text );
+	// END OF LEGACY COMPATIBLE FUCNTIONS
+	// DON'T BREAK ABI, ONLY ADD NEW FUNCTIONS TO THE END OF STRUCTURE
+
+	// initialize VGUI2 after client.dll was loaded
+	void (*ClientStartup)( void *clientInstance, int width, int height );
 } vgui_support_interface_t;
 
 typedef int (*VGUISUPPORTAPI)( int version, vgui_support_interface_t *pFunctionTable, vgui_support_api_t *engfuncs );