event logging

1 files changed, 77 insertions, 0 deletions

diff --git a/libs/timer_lib/timer.h b/libs/timer_lib/timer.h
new file mode 100644
index 0000000..c7d8bba
--- /dev/null
+++ b/libs/timer_lib/timer.h
@@ -0,0 +1,77 @@
+/* timer.h  -  Cross-platform timer library  -  Public Domain  -  2011 Mattias Jansson / Rampant Pixels
+ *
+ * This library provides a cross-platform interface to measure
+ * elapsed time with (at least) millisecond accuracy.
+ *
+ * This library is put in the public domain; you can redistribute
+ * it and/or modify it without any restrictions.
+ *
+ */
+
+#pragma once
+
+/*! \file timer.h
+    Time measurements */
+
+#if TIMER_COMPILE
+#define TIMER_API
+#else
+#if __cplusplus
+#define TIMER_API extern "C"
+#else
+#define TIMER_API extern
+#endif
+#endif
+
+#if defined( _WIN32 ) || defined( _WIN64 )
+
+//! Tick type
+typedef unsigned __int64 tick_t;
+
+#else
+
+#include <stdint.h>
+//! Tick type
+typedef uint64_t         tick_t;
+
+#endif
+
+//! Deltatime type (float or double)
+//typedef float            deltatime_t;
+typedef double           deltatime_t;
+
+
+/*! Initialize timer library */
+TIMER_API int            timer_lib_initialize( void );
+
+/*! Shutdown timer library */
+TIMER_API void           timer_lib_shutdown( void );
+
+/*! Get current timestamp, in ticks of system-specific frequency (queryable with timer_ticks_per_second), measured from some system-specific base timestamp
+    and not in sync with other timestamps
+    \return              Current timestamp */
+TIMER_API tick_t         timer_current( void );
+
+/*! Get elapsed time since given timestamp
+    \param t             Timestamp
+    \return              Number of seconds elapsed */
+TIMER_API deltatime_t    timer_elapsed( const tick_t t );
+
+/*! Get elapsed ticks since given timestamp
+    \param t             Timestamp
+    \return              Number of ticks elapsed */
+TIMER_API tick_t         timer_elapsed_ticks( const tick_t t );
+
+/*! Get timer frequency, as number of ticks per second
+    \return              Ticks per second */
+TIMER_API tick_t         timer_ticks_per_second( void );
+
+/*! Get ticks as seconds (effectively calculating ticks/timer_ticks_per_second())
+	\param dt            Deltatime in ticks
+    \return              Deltatime in seconds */
+TIMER_API deltatime_t    timer_ticks_to_seconds( const tick_t dt );
+
+/*! Get system time, in milliseconds since the epoch (UNIX time)
+    \return  Current timestamp, in milliseconds */
+TIMER_API tick_t         timer_system( void );
+