Windowing system abstraction (WIP).

diff --git a/glretrace.hpp b/glretrace.hpp
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+/**************************************************************************
+ *
+ * Copyright 2011 Jose Fonseca
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/*
+ * Abstraction for GL window system specific APIs (GLX, WGL).
+ */
+
+#ifndef _GLRETRACE_HPP_
+#define _GLRETRACE_HPP_
+
+
+namespace glretrace {
+
+
+struct Visual
+{
+    unsigned long redMask;
+    unsigned long greenMask;
+    unsigned long blueMask;
+    unsigned long alphaMask;
+    bool doubleBuffer;
+};
+
+
+struct Context
+{
+    const Visual *visual;
+};
+
+
+struct Drawable
+{
+    unsigned width;
+    unsigned height;
+};
+
+
+class WindowSystem
+{
+public:
+    Drawable *currentDrawable;
+    Context *currentContext;
+
+
+    inline WindowSystem() :
+        currentDrawable(NULL),
+        currentContext(NULL)
+    {}
+
+    virtual ~WindowSystem() {}
+
+    //
+    // Drawables
+    //
+
+    virtual Drawable *
+    createDrawable(unsigned width = 0, unsigned height = 0) = 0;
+
+    virtual void
+    resizeDrawable(Drawable *drawable, unsigned width, unsigned height) = 0;
+
+    virtual Void *
+    destroyDrawable(void) = 0;
+
+    // 
+    // Contexts
+    //
+ 
+    virtual Context *
+    createContext(const Visual *visual) = 0;
+
+    virtual void
+    deleteContext(Context *) = 0;
+    
+    virtual bool
+    makeCurrent(Drawable *drawable, Context *context) = 0;
+
+    virtual bool
+    processEvents(void) = 0;
+};
+
+
+WindowSystem *createNativeWindowSystem(void);
+
+
+} /* namespace glretrace */
+
+
+#endif /* _GLRETRACE_HPP_ */