1 files changed, 193 insertions, 0 deletions
diff --git a/source/core/StarLogging.hpp b/source/core/StarLogging.hpp
new file mode 100644
index 0000000..d90e0e1
--- /dev/null
+++ b/source/core/StarLogging.hpp
@@ -0,0 +1,193 @@
+#ifndef STAR_LOGGING_HPP
+#define STAR_LOGGING_HPP
+
+#include "StarThread.hpp"
+#include "StarSet.hpp"
+#include "StarString.hpp"
+#include "StarPoly.hpp"
+#include "StarBiMap.hpp"
+#include "StarTime.hpp"
+#include "StarFile.hpp"
+
+namespace Star {
+
+enum class LogLevel {
+  Debug,
+  Info,
+  Warn,
+  Error
+};
+extern EnumMap<LogLevel> const LogLevelNames;
+
+STAR_CLASS(LogSink);
+
+// A sink for Logger messages.
+class LogSink {
+public:
+  LogSink();
+  virtual ~LogSink();
+
+  virtual void log(char const* msg, LogLevel level) = 0;
+
+  void setLevel(LogLevel level);
+  LogLevel level();
+
+private:
+  atomic<LogLevel> m_level;
+};
+
+class StdoutLogSink : public LogSink {
+public:
+  virtual void log(char const* msg, LogLevel level);
+
+private:
+  Mutex m_logMutex;
+};
+
+class FileLogSink : public LogSink {
+public:
+  FileLogSink(String const& filename, LogLevel level, bool truncate);
+
+  virtual void log(char const* msg, LogLevel level);
+
+private:
+  FilePtr m_output;
+  Mutex m_logMutex;
+};
+
+// A basic loging system that logs to multiple streams.  Can log at Debug,
+// Info, Warn, and Error logging levels.  By default logs to stdout.
+class Logger {
+public:
+  static void addSink(LogSinkPtr s);
+  static void removeSink(LogSinkPtr s);
+
+  // Default LogSink that outputs to stdout.
+  static LogSinkPtr stdoutSink();
+  // Don't use the stdout sink.
+  static void removeStdoutSink();
+
+  static void log(LogLevel level, char const* msg);
+
+  template <typename... Args>
+  static void logf(LogLevel level, char const* msg, Args const&... args);
+
+  template <typename... Args>
+  static void debug(char const* msg, Args const&... args);
+  template <typename... Args>
+  static void info(char const* msg, Args const&... args);
+  template <typename... Args>
+  static void warn(char const* msg, Args const&... args);
+  template <typename... Args>
+  static void error(char const* msg, Args const&... args);
+
+private:
+  static shared_ptr<StdoutLogSink> s_stdoutSink;
+  static HashSet<LogSinkPtr> s_sinks;
+  static Mutex s_mutex;
+};
+
+// For logging data that is very high frequency. It is a map of debug values to
+// be displayed every frame, or in a debug output window, etc.
+class LogMap {
+public:
+  static String getValue(String const& key);
+  static void setValue(String const& key, String const& value);
+
+  // Shorthand, converts given type to string using std::ostream.
+  template <typename T>
+  static void set(String const& key, T const& t);
+
+  static Map<String, String> getValues();
+  static void clear();
+
+private:
+  static HashMap<String, String> s_logMap;
+  static Mutex s_logMapMutex;
+};
+
+// Logging for spatial data.  Divided into multiple named coordinate spaces.
+class SpatialLogger {
+public:
+  // Maximum count of objects stored per space
+  static size_t const MaximumLines = 200000;
+  static size_t const MaximumPoints = 200000;
+  static size_t const MaximumText = 10000;
+
+  struct Line {
+    Vec2F begin;
+    Vec2F end;
+    Vec4B color;
+  };
+
+  struct Point {
+    Vec2F position;
+    Vec4B color;
+  };
+
+  struct LogText {
+    String text;
+    Vec2F position;
+    Vec4B color;
+  };
+
+  static void logPoly(char const* space, PolyF const& poly, Vec4B const& color);
+  static void logLine(char const* space, Line2F const& line, Vec4B const& color);
+  static void logLine(char const* space, Vec2F const& begin, Vec2F const& end, Vec4B const& color);
+  static void logPoint(char const* space, Vec2F const& position, Vec4B const& color);
+  static void logText(char const* space, String text, Vec2F const& position, Vec4B const& color);
+
+  static Deque<Line> getLines(char const* space, bool andClear);
+  static Deque<Point> getPoints(char const* space, bool andClear);
+  static Deque<LogText> getText(char const* space, bool andClear);
+
+  static void clear();
+
+private:
+  static Mutex s_mutex;
+  static StringMap<Deque<Line>> s_lines;
+  static StringMap<Deque<Point>> s_points;
+  static StringMap<Deque<LogText>> s_logText;
+};
+
+template <typename... Args>
+void Logger::logf(LogLevel level, char const* msg, Args const&... args) {
+  MutexLocker locker(s_mutex);
+  Maybe<std::string> output;
+  for (auto const& l : s_sinks) {
+    if (l->level() <= level) {
+      if (!output)
+        output = strf(msg, args...);
+      l->log(output->c_str(), level);
+    }
+  }
+}
+
+template <typename... Args>
+void Logger::debug(char const* msg, Args const&... args) {
+  logf(LogLevel::Debug, msg, args...);
+}
+
+template <typename... Args>
+void Logger::info(char const* msg, Args const&... args) {
+  logf(LogLevel::Info, msg, args...);
+}
+
+template <typename... Args>
+void Logger::warn(char const* msg, Args const&... args) {
+  logf(LogLevel::Warn, msg, args...);
+}
+
+template <typename... Args>
+void Logger::error(char const* msg, Args const&... args) {
+  logf(LogLevel::Error, msg, args...);
+}
+
+template <typename T>
+void LogMap::set(String const& key, T const& t) {
+  setValue(key, strf("%s", t));
+}
+
+}
+
+#endif