Moved parts of the logging code into the public API (so users can redirect logs).

include/PolyVox/Logging.h

@@ -0,0 +1,76 @@
+/*******************************************************************************
+Copyright (c) 2005-2009 David Williams and Matthew Williams
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+claim that you wrote the original software. If you use this software
+in a product, an acknowledgment in the product documentation would be
+appreciated but is not required.
+
+2. Altered source versions must be plainly marked as such, and must not be
+misrepresented as being the original software.
+
+3. This notice may not be removed or altered from any source
+distribution.
+*******************************************************************************/
+
+#ifndef __PolyVox_Logging_H__
+#define __PolyVox_Logging_H__
+
+#include <iostream>
+#include <string>
+
+// We expose the logger class to the user so that they can provide custom implementations
+// to redirect PolyVox's log messages. However, it is not expected that user code will make 
+// use of PolyVox's logging macros s these are part of the private implementation.
+namespace PolyVox
+{
+	class Logger
+	{
+	public:
+		Logger() {};
+		virtual ~Logger() {};
+
+		virtual void logTraceMessage(const std::string& message) = 0;
+		virtual void logDebugMessage(const std::string& message) = 0;
+		virtual void logInfoMessage(const std::string& message) = 0;
+		virtual void logWarningMessage(const std::string& message) = 0;
+		virtual void logErrorMessage(const std::string& message) = 0;
+		virtual void logFatalMessage(const std::string& message) = 0;
+	};
+
+	class DefaultLogger : public Logger
+	{
+	public:
+		DefaultLogger() : Logger() {}
+		virtual ~DefaultLogger() {}
+
+		// Appending the 'std::endl' forces the stream to be flushed.
+		void logTraceMessage(const std::string& /*message*/) {  }
+		void logDebugMessage(const std::string& /*message*/) {  }
+		void logInfoMessage(const std::string& message) { std::cout << message << std::endl; }
+		void logWarningMessage(const std::string& message) { std::cerr << message << std::endl; }
+		void logErrorMessage(const std::string& message) { std::cerr << message << std::endl; }
+		void logFatalMessage(const std::string& message) { std::cerr << message << std::endl; }
+	};
+
+	inline Logger*& getLoggerInstance()
+	{
+		static Logger* s_pLogger = new DefaultLogger;
+		return s_pLogger;
+	}
+
+	inline void setLoggerInstance(Logger* pLogger)
+	{
+		getLoggerInstance() = pLogger;
+	}
+}
+
+#endif //__PolyVox_Logging_H__