Allow using VBOs for meshes all the way down to 4 vertices (#14366)

This may improve performance substantially if there are many meshes with "few" vertices that would otherwise be retransmitted to the GPU every frame. In testing, this does not seem to decrease performance, even if as few as 4 vertices are used (e.g. particles).

src/client/clientlauncher.cpp

@@ -114,12 +114,6 @@ bool ClientLauncher::run(GameStartData &start_data, const Settings &cmd_args)
 
 	m_rendering_engine->setupTopLevelWindow();
 
-	/*
-		This changes the minimum allowed number of vertices in a VBO.
-		Default is 500.
-	*/
-	//driver->setMinHardwareBufferVertexCount(50);
-
 	// Create game callback for menus
 	g_gamecallback = new MainGameCallback();
 

src/client/renderingengine.cpp

@@ -152,6 +152,9 @@ RenderingEngine::RenderingEngine(IEventReceiver *receiver)
 	driver = m_device->getVideoDriver();
 	infostream << "Using the " << RenderingEngine::getVideoDriverInfo(driver->getDriverType()).friendly_name << " video driver" << std::endl;
 
+	// This changes the minimum allowed number of vertices in a VBO. Default is 500.
+	driver->setMinHardwareBufferVertexCount(4);
+
 	s_singleton = this;
 
 	auto skin = createSkin(m_device->getGUIEnvironment(),