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

OpenRA.Renderer.SdlCommon/Texture.cs

@@ -0,0 +1,122 @@
+#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.Drawing;
+using System.Drawing.Imaging;
+using System.IO;
+using OpenRA.FileFormats;
+using OpenRA.FileFormats.Graphics;
+using Tao.OpenGl;
+
+namespace OpenRA.Renderer.SdlCommon
+{
+	public class Texture : ITexture
+	{
+		public int texture;		/* temp: can be internal again once shaders are in shared code */
+		
+		public Texture()
+		{
+			Gl.glGenTextures(1, out texture);
+			ErrorHandler.CheckGlError();
+		}
+		
+		public Texture(Bitmap bitmap)
+		{
+			Gl.glGenTextures(1, out texture);
+			ErrorHandler.CheckGlError();
+			SetData(bitmap);
+		}
+
+		void FinalizeInner() { Gl.glDeleteTextures(1, ref texture); }
+		~Texture() { Game.RunAfterTick(FinalizeInner); }
+
+		void PrepareTexture()
+		{
+			ErrorHandler.CheckGlError();
+			Gl.glBindTexture(Gl.GL_TEXTURE_2D, texture);
+			ErrorHandler.CheckGlError();
+			Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAG_FILTER, Gl.GL_NEAREST);
+			ErrorHandler.CheckGlError();
+			Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MIN_FILTER, Gl.GL_NEAREST);
+			ErrorHandler.CheckGlError();
+			
+			Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_BASE_LEVEL, 0);
+			ErrorHandler.CheckGlError();
+			Gl.glTexParameteri(Gl.GL_TEXTURE_2D, Gl.GL_TEXTURE_MAX_LEVEL, 0);
+			ErrorHandler.CheckGlError();
+		}
+
+		public void SetData(byte[] colors, int width, int height)
+		{
+			if (!IsPowerOf2(width) || !IsPowerOf2(height))
+				throw new InvalidDataException("Non-power-of-two array {0}x{1}".F(width, height));
+
+			unsafe
+			{
+				fixed (byte* ptr = &colors[0])
+				{
+					IntPtr intPtr = new IntPtr((void*)ptr);
+					PrepareTexture();
+					Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, Gl.GL_RGBA8, width, height,
+						0, Gl.GL_BGRA, Gl.GL_UNSIGNED_BYTE, intPtr);
+					ErrorHandler.CheckGlError();
+				}
+			}
+		}
+
+		// An array of RGBA
+		public void SetData(uint[,] colors)
+		{
+			int width = colors.GetUpperBound(1) + 1;
+			int height = colors.GetUpperBound(0) + 1;
+			
+			if (!IsPowerOf2(width) || !IsPowerOf2(height))
+				throw new InvalidDataException("Non-power-of-two array {0}x{1}".F(width,height));
+			
+			unsafe
+			{
+				fixed (uint* ptr = &colors[0,0])
+				{
+					IntPtr intPtr = new IntPtr((void *) ptr);
+					PrepareTexture();
+					Gl.glTexImage2D(Gl.GL_TEXTURE_2D, 0, Gl.GL_RGBA8, width, height,
+						0, Gl.GL_BGRA, Gl.GL_UNSIGNED_BYTE, intPtr);
+					ErrorHandler.CheckGlError();
+				}
+			}
+		}
+		
+		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(Exts.NextPowerOf2(bitmap.Width), Exts.NextPowerOf2(bitmap.Height)));
+			}
+			
+			var bits = bitmap.LockBits(
+				new Rectangle(0, 0, bitmap.Width, bitmap.Height),
+				ImageLockMode.ReadOnly,
+				PixelFormat.Format32bppArgb);
+			
+			PrepareTexture();
+			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
+			ErrorHandler.CheckGlError();
+			bitmap.UnlockBits(bits);
+		}
+
+		bool IsPowerOf2(int v)
+		{
+			return (v & (v - 1)) == 0;
+		}
+	}
+}