Remove Vertex from PlatformInterfaces

OpenRA.Platforms.Default/Sdl2GraphicsContext.cs

@@ -10,7 +10,6 @@
 #endregion
 
 using System;
-using OpenRA.Graphics;
 using OpenRA.Primitives;
 using SDL2;
 
@@ -62,10 +61,10 @@ namespace OpenRA.Platforms.Default
 			OpenGL.CheckGLError();
 		}
 
-		public IVertexBuffer<Vertex> CreateVertexBuffer(int size)
+		public IVertexBuffer<T> CreateVertexBuffer<T>(int size) where T : struct
 		{
 			VerifyThreadAffinity();
-			return new VertexBuffer<Vertex>(size);
+			return new VertexBuffer<T>(size);
 		}
 
 		public IIndexBuffer CreateIndexBuffer(uint[] indices)
@@ -74,10 +73,10 @@ namespace OpenRA.Platforms.Default
 			return new StaticIndexBuffer(indices);
 		}
 
-		public Vertex[] CreateVertices(int size)
+		public T[] CreateVertices<T>(int size) where T : struct
 		{
 			VerifyThreadAffinity();
-			return new Vertex[size];
+			return new T[size];
 		}
 
 		public ITexture CreateTexture()