split renderer into a file per class

OpenRA.Gl/Texture.cs

@@ -0,0 +1,82 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007,2009,2010 Chris Forbes, Robert Pepperell, Matthew Bowra-Dean, Paul Chote, Alli Witheford.
+ * This file is part of OpenRA.
+ * 
+ *  OpenRA is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ * 
+ *  OpenRA is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with OpenRA.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System.Drawing;
+using System.Drawing.Imaging;
+using OpenRA.FileFormats.Graphics;
+using Tao.OpenGl;
+
+namespace OpenRA.GlRenderer
+{
+	public class Texture : ITexture
+	{
+		internal int texture;
+
+		public Texture(GraphicsDevice dev, Bitmap bitmap)
+		{
+			Gl.glGenTextures(1, out texture);
+			GraphicsDevice.CheckGlError();
+			SetData(bitmap);
+		}
+
+		public void SetData(Bitmap bitmap)
+		{
+			if (!IsPowerOf2(bitmap.Width) || !IsPowerOf2(bitmap.Height))
+			{
+				//throw new InvalidOperationException( "non-power-of-2-texture" );
+				bitmap = new Bitmap(bitmap, new Size(NextPowerOf2(bitmap.Width), NextPowerOf2(bitmap.Height)));
+			}
+
+			Gl.glBindTexture(Gl.GL_TEXTURE_2D, texture);
+			GraphicsDevice.CheckGlError();
+
+			var bits = bitmap.LockBits(
+				new Rectangle(0, 0, bitmap.Width, bitmap.Height),
+				ImageLockMode.ReadOnly,
+				PixelFormat.Format32bppArgb);
+
+			Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_BASE_LEVEL, 0);
+			GraphicsDevice.CheckGlError();
+			Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAX_LEVEL, 0);
+			GraphicsDevice.CheckGlError();
+			Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, Gl.GL_RGBA8, bits.Width, bits.Height,
+				0, Gl.GL_BGRA, Gl.GL_UNSIGNED_BYTE, bits.Scan0);        // todo: weird strides
+			GraphicsDevice.CheckGlError();
+
+			bitmap.UnlockBits(bits);
+		}
+
+		bool IsPowerOf2(int v)
+		{
+			return (v & (v - 1)) == 0;
+		}
+
+		int NextPowerOf2(int v)
+		{
+			--v;
+			v |= v >> 1;
+			v |= v >> 2;
+			v |= v >> 4;
+			v |= v >> 8;
+			++v;
+			return v;
+		}
+	}
+}