start moving common parts of the renderer into OpenRA.Renderer.SdlCommon

OpenRA.Renderer.SdlCommon/VertexBuffer.cs

@@ -0,0 +1,58 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made 
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using System;
+using System.Runtime.InteropServices;
+using OpenRA.FileFormats.Graphics;
+using Tao.OpenGl;
+
+namespace OpenRA.Renderer.SdlCommon
+{
+	public class VertexBuffer<T> : IVertexBuffer<T>
+			where T : struct
+	{
+		int buffer;
+
+		public VertexBuffer(int size)
+		{
+			Gl.glGenBuffers(1, out buffer);
+			ErrorHandler.CheckGlError();
+			Bind();
+			Gl.glBufferData(Gl.GL_ARRAY_BUFFER,
+				new IntPtr(Marshal.SizeOf(typeof(T)) * size),
+				new T[ size ],
+				Gl.GL_DYNAMIC_DRAW);
+			ErrorHandler.CheckGlError();
+		}
+
+		public void SetData(T[] data, int length)
+		{
+			Bind();
+			Gl.glBufferSubData(Gl.GL_ARRAY_BUFFER,
+				IntPtr.Zero,
+				new IntPtr(Marshal.SizeOf(typeof(T)) * length),
+				data);
+			ErrorHandler.CheckGlError();
+		}
+
+		public void Bind()
+		{
+			Gl.glBindBuffer(Gl.GL_ARRAY_BUFFER, buffer);
+			ErrorHandler.CheckGlError();
+			Gl.glVertexPointer(3, Gl.GL_FLOAT, Marshal.SizeOf(typeof(T)), IntPtr.Zero);
+			ErrorHandler.CheckGlError();
+			Gl.glTexCoordPointer(4, Gl.GL_FLOAT, Marshal.SizeOf(typeof(T)), new IntPtr(12));
+			ErrorHandler.CheckGlError();
+		}
+
+		void FinalizeInner() { Gl.glDeleteBuffers( 1, ref buffer ); }
+		~VertexBuffer() { Game.RunAfterTick( FinalizeInner ); }
+	}
+}