Implement texture buffers (#1152)

* Implement texture buffers

* Throw NotSupportedException where appropriate

Ryujinx.Graphics.OpenGL/TextureBase.cs

@@ -0,0 +1,39 @@
+using OpenTK.Graphics.OpenGL;
+using Ryujinx.Graphics.GAL;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Ryujinx.Graphics.OpenGL
+{
+    class TextureBase
+    {
+        public int Handle { get; protected set; }
+
+        protected TextureCreateInfo Info { get; }
+
+        public int Width => Info.Width;
+        public int Height => Info.Height;
+
+        public Target Target => Info.Target;
+        public Format Format => Info.Format;
+
+        public TextureBase(TextureCreateInfo info)
+        {
+            Info = info;
+
+            Handle = GL.GenTexture();
+        }
+
+        public void Bind(int unit)
+        {
+            Bind(Target.Convert(), unit);
+        }
+
+        protected void Bind(TextureTarget target, int unit)
+        {
+            GL.ActiveTexture(TextureUnit.Texture0 + unit);
+            GL.BindTexture(target, Handle);
+        }
+    }
+}