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+// BEGIN_COPYRIGHT -*- glean -*-
+// 
+// Copyright (C) 1999  Allen Akin   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 ALLEN AKIN 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.
+// 
+// END_COPYRIGHT
+
+
+
+
+// winsys.h:  facade for common window-system operations
+
+// This class and related classes provide window system operations
+// that are sufficient to support most basic rendering tests.  These
+// operations include initializing the window system, creating and
+// destroying windows and rendering contexts, selecting pixel
+// configurations, etc.
+
+// Tests using this set of classes for all window system services are
+// ``portable'' in a useful sense.  Not all tests are portable,
+// however; in particular, tests of window-system-specific
+// functionality must execute window system commands directly.  Such
+// tests may require access to class members that would ideally be
+// private; for example, the X11 Display pointer.  Thus most members
+// of this class are public.
+
+
+
+#ifndef __winsys_h__
+#define __winsys_h__
+
+using namespace std;
+
+#include <string>
+#include <vector>
+#include "glwrap.h"
+
+namespace GLEAN {
+
+class DrawingSurface;		// Forward and mutually-recursive references.
+class Window;
+class DrawingSurfaceConfig;
+class RenderingContext;
+class Options;
+
+class WindowSystem {
+    public:
+    	// Constructors/Destructor:
+
+	WindowSystem(Options& o);
+	~WindowSystem();
+
+	// Exceptions:
+
+	struct Error { };		// Base class for window system errors.
+	struct CantOpenDisplay: public Error {	// Can't initialize display.
+	};
+	struct NoOpenGL: public Error {	// Missing GLX, WGL, etc.
+	};
+
+	// Utilities:
+
+	bool makeCurrent();		// Remove context/surface binding.
+	bool makeCurrent(RenderingContext& r, Window& w);
+					// Bind given context and surface.
+	void quiesce();			// Wait for system to go idle.
+
+	// State information:
+
+	vector<DrawingSurfaceConfig*> surfConfigs;
+				// All available drawing surface configurations.
+	vector<DrawingSurface*> surfaces;
+				// All currently-active surfaces.
+	vector<RenderingContext*> contexts;
+				// All currently-active rendering contexts.
+
+#   if defined(__X11__)
+	Display* dpy;		// Pointer to X11 Display structure.
+	
+	int GLXVersMajor;	// GLX major version number.
+	int GLXVersMinor;	// GLX minor version number.
+
+	XVisualInfo* vip;	// Array of raw XVisualInfo structures.
+
+#   elif defined(__WIN__)
+
+#   elif defined(__BEWIN__)
+	BApplication *theApp;
+
+#   endif
+
+}; // class WindowSystem
+
+} // namespace GLEAN
+
+#endif // __winsys_h__