engine: fix black screen in changelevel

engine/client.cpp

@@ -1816,14 +1816,14 @@ void CClientState::FinishSignonState_New()
 	//
 	// This is pretty janky, but doesn't really have any cost (and even makes our one-frozen-frame load screen slightly
 	// less likely to trigger OS "not responding" warnings)
-//	extern void V_RenderVGuiOnly();
-//	V_RenderVGuiOnly();
+	extern void V_RenderSwapBuffers();
+	V_RenderSwapBuffers();
 
 	// Before we do anything with the whitelist, make sure we have the proper map pack mounted
 	// this will load the .bsp by setting the world model the string list at the hardcoded index 1.
 	cl.SetModel( 1 );
 
-	//V_RenderVGuiOnly();
+	V_RenderSwapBuffers();
 
 	// Check for a new whitelist. It's good to do it early in the connection process here because if we wait until later,
 	// the client may have loaded some files w/o the proper whitelist restrictions and we'd have to reload them.

engine/modelloader.cpp

@@ -956,13 +956,13 @@ void EnableHDR( bool bEnable )
 	///             ancient bugs, hence the kill switch.
 	bool bUpdateOffline = mod_offline_hdr_switch.GetBool();
 #ifndef DEDICATED
-	extern void V_RenderVGuiOnly();
+	extern void V_RenderSwapBuffers();
 #endif
 
 	if ( bUpdateOffline )
 	{
 #ifndef DEDICATED
-		V_RenderVGuiOnly();
+		V_RenderSwapBuffers();
 #endif
 		materials->ReleaseResources();
 	}
@@ -986,7 +986,7 @@ void EnableHDR( bool bEnable )
 #ifndef DEDICATED
 	if ( bUpdateOffline )
 	{
-		V_RenderVGuiOnly();
+		V_RenderSwapBuffers();
 	}
 #endif
 }

engine/view.cpp

@@ -171,6 +171,18 @@ void V_RenderVGuiOnly( void )
 	Shader_SwapBuffers();
 }
 
+void V_RenderSwapBuffers( void )
+{
+	materials->BeginFrame( host_frametime );
+	g_EngineRenderer->FrameBegin();
+
+	UpdateMaterialSystemConfig();
+
+	g_EngineRenderer->FrameEnd( );
+	materials->EndFrame();
+
+	Shader_SwapBuffers();
+}
 
 void FullViewColorAdjustment( )
 {