gl context works

OpenRa.Gl/GraphicsDevice.cs

@@ -1,22 +1,70 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Windows.Forms;
 using System.Drawing;
 using System.IO;
+using System.Windows.Forms;
 
-namespace OpenRa.Gl
+using Tao.OpenGl;
+using Tao.Cg;
+using Tao.Platform.Windows;
+using System.Runtime.InteropServices;
+
+namespace OpenRa.GlRenderer
 {
     public class GraphicsDevice
     {
-        public GraphicsDevice(Control host, int width, int height, bool fullscreen, bool vsync) { }
-        public void EnableScissor(int left, int top, int width, int height) { }
-        public void DisableScissor() { }
+        Graphics g;
+        IntPtr dc;
+        IntPtr rc;
+
+        public GraphicsDevice(Control control, int width, int height, bool fullscreen, bool vsync)
+        {
+            g = control.CreateGraphics();
+            dc = g.GetHdc();
+            
+            var pfd = new Gdi.PIXELFORMATDESCRIPTOR
+            {
+                nSize = (short)Marshal.SizeOf(typeof(Gdi.PIXELFORMATDESCRIPTOR)),
+                nVersion = 1,
+                dwFlags = Gdi.PFD_SUPPORT_OPENGL | Gdi.PFD_DRAW_TO_BITMAP | Gdi.PFD_DOUBLEBUFFER,
+                iPixelType = Gdi.PFD_TYPE_RGBA,
+                cColorBits = 24,
+                iLayerType = Gdi.PFD_MAIN_PLANE
+            };
+
+            var iFormat = Gdi.ChoosePixelFormat(dc, ref pfd);
+            Gdi.SetPixelFormat(dc, iFormat, ref pfd);
+
+            rc = Wgl.wglCreateContext(dc);
+            if (rc == IntPtr.Zero)
+                throw new InvalidOperationException("can't create wglcontext");
+            Wgl.wglMakeCurrent(dc, rc);
+        }
+
+        public void EnableScissor(int left, int top, int width, int height)
+        {
+            Gl.glScissor(left, top, width, height);
+            Gl.glEnable(Gl.GL_SCISSOR_TEST);
+        }
+
+        public void DisableScissor()
+        {
+            Gl.glDisable(Gl.GL_SCISSOR_TEST);
+        }
+
         public void Begin() { }
         public void End() { }
-        public void Clear(Color c) { }
-        public void Present() { }
+
+        public void Clear(Color c)
+        {
+            Gl.glClearColor(1, 1, 1, 1); 
+            Gl.glClear(Gl.GL_COLOR_BUFFER_BIT);
+        }
+
+        public void Present()
+        {
+            Wgl.wglSwapBuffers(dc);
+        }
+
         public void DrawIndexedPrimitives(PrimitiveType pt, Range<int> vertices, Range<int> indices) { }
         public void DrawIndexedPrimitives(PrimitiveType pt, int numVerts, int numPrimitives) { }
     }