untie the engine from SDL2 and MiniTK

OpenRA.Platforms.Default/Texture.cs

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+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 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 OpenTK.Graphics.OpenGL;
+
+namespace OpenRA.Platforms.Default
+{
+	public sealed class Texture : ITexture
+	{
+		int texture;
+		TextureScaleFilter scaleFilter;
+		Size size;
+
+		public int ID { get { return texture; } }
+
+		public Size Size { get { return size; } }
+
+		bool disposed;
+
+		public TextureScaleFilter ScaleFilter
+		{
+			get
+			{
+				return scaleFilter;
+			}
+
+			set
+			{
+				if (scaleFilter == value)
+					return;
+
+				scaleFilter = value;
+				PrepareTexture();
+			}
+		}
+
+		public Texture()
+		{
+			GL.GenTextures(1, out texture);
+			ErrorHandler.CheckGlError();
+		}
+
+		public Texture(Bitmap bitmap)
+		{
+			GL.GenTextures(1, out texture);
+			ErrorHandler.CheckGlError();
+			SetData(bitmap);
+		}
+
+		void PrepareTexture()
+		{
+			ErrorHandler.CheckGlError();
+			GL.BindTexture(TextureTarget.Texture2D, texture);
+			ErrorHandler.CheckGlError();
+
+			var filter = scaleFilter == TextureScaleFilter.Linear ? (int)TextureMinFilter.Linear : (int)TextureMinFilter.Nearest;
+			GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, filter);
+			ErrorHandler.CheckGlError();
+			GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, filter);
+			ErrorHandler.CheckGlError();
+
+			GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (float)TextureWrapMode.ClampToEdge);
+			ErrorHandler.CheckGlError();
+			GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (float)TextureWrapMode.ClampToEdge);
+			ErrorHandler.CheckGlError();
+
+			GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureBaseLevel, 0);
+			ErrorHandler.CheckGlError();
+			GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMaxLevel, 0);
+			ErrorHandler.CheckGlError();
+		}
+
+		public void SetData(byte[] colors, int width, int height)
+		{
+			if (!Exts.IsPowerOf2(width) || !Exts.IsPowerOf2(height))
+				throw new InvalidDataException("Non-power-of-two array {0}x{1}".F(width, height));
+
+			size = new Size(width, height);
+			unsafe
+			{
+				fixed (byte* ptr = &colors[0])
+				{
+					var intPtr = new IntPtr((void*)ptr);
+					PrepareTexture();
+					GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba8, width, height,
+						0, OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, intPtr);
+					ErrorHandler.CheckGlError();
+				}
+			}
+		}
+
+		// An array of RGBA
+		public void SetData(uint[,] colors)
+		{
+			var width = colors.GetUpperBound(1) + 1;
+			var height = colors.GetUpperBound(0) + 1;
+
+			if (!Exts.IsPowerOf2(width) || !Exts.IsPowerOf2(height))
+				throw new InvalidDataException("Non-power-of-two array {0}x{1}".F(width, height));
+
+			size = new Size(width, height);
+			unsafe
+			{
+				fixed (uint* ptr = &colors[0, 0])
+				{
+					var intPtr = new IntPtr((void*)ptr);
+					PrepareTexture();
+					GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba8, width, height,
+						0, OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, intPtr);
+					ErrorHandler.CheckGlError();
+				}
+			}
+		}
+
+		public void SetData(Bitmap bitmap)
+		{
+			var allocatedBitmap = false;
+			if (!Exts.IsPowerOf2(bitmap.Width) || !Exts.IsPowerOf2(bitmap.Height))
+			{
+				bitmap = new Bitmap(bitmap, bitmap.Size.NextPowerOf2());
+				allocatedBitmap = true;
+			}
+
+			try
+			{
+				size = new Size(bitmap.Width, bitmap.Height);
+				var bits = bitmap.LockBits(bitmap.Bounds(),
+					ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
+
+				PrepareTexture();
+				GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba8, bits.Width, bits.Height,
+					0, OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, bits.Scan0); // TODO: weird strides
+				ErrorHandler.CheckGlError();
+				bitmap.UnlockBits(bits);
+			}
+			finally
+			{
+				if (allocatedBitmap)
+					bitmap.Dispose();
+			}
+		}
+
+		public byte[] GetData()
+		{
+			var data = new byte[4 * size.Width * size.Height];
+
+			ErrorHandler.CheckGlError();
+			GL.BindTexture(TextureTarget.Texture2D, texture);
+			unsafe
+			{
+				fixed (byte* ptr = &data[0])
+				{
+					var intPtr = new IntPtr((void*)ptr);
+					GL.GetTexImage(TextureTarget.Texture2D, 0, OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, intPtr);
+				}
+			}
+
+			ErrorHandler.CheckGlError();
+			return data;
+		}
+
+		public void SetEmpty(int width, int height)
+		{
+			if (!Exts.IsPowerOf2(width) || !Exts.IsPowerOf2(height))
+				throw new InvalidDataException("Non-power-of-two array {0}x{1}".F(width, height));
+
+			size = new Size(width, height);
+			PrepareTexture();
+			GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba8, width, height,
+				0, OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, IntPtr.Zero);
+			ErrorHandler.CheckGlError();
+		}
+
+		~Texture()
+		{
+			Game.RunAfterTick(() => Dispose(false));
+		}
+
+		public void Dispose()
+		{
+			Game.RunAfterTick(() => Dispose(true));
+			GC.SuppressFinalize(this);
+		}
+
+		void Dispose(bool disposing)
+		{
+			if (disposed)
+				return;
+			disposed = true;
+			GL.DeleteTextures(1, ref texture);
+		}
+	}
+}