Add helper header to simplify measuring time spent in a block or statement.

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@7765 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/timing.h b/timing.h
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+++ b/timing.h
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+/*
+Simple helper macros to time blocks or statements.
+
+Copyright (C) 2007 Frank Richter
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+
+#ifndef __TIMING_H__
+#define __TIMING_H__
+
+#if defined(DO_TIMING)
+
+#define TIMING_BEGIN   double _timing_end_, _timing_start_ = Sys_DoubleTime();
+#define TIMING_END_STR(S)              \
+  _timing_end_ = Sys_DoubleTime();     \
+  Con_Printf ("%s: %.3g s\n", S, _timing_end_ - _timing_start_);
+#define TIMING_END     TIMING_END_STR(__FUNCTION__)
+
+#define TIMING_INTERMEDIATE(S)                                         \
+  {                                                                    \
+    double currentTime = Sys_DoubleTime();                             \
+    Con_Printf ("%s: %.3g s\n", S, currentTime - _timing_start_);      \
+  }
+  
+#define TIMING_TIMESTATEMENT(Stmt)     \
+  {                                    \
+    TIMING_BEGIN                       \
+    Stmt;                              \
+    TIMING_END_STR(#Stmt);             \
+  }
+
+#else
+
+#define TIMING_BEGIN
+#define TIMING_END_STR(S)
+#define TIMING_END
+#define TIMING_INTERMEDIATE(S)
+#define TIMING_TIMESTATEMENT(Stmt)     Stmt
+
+#endif
+
+#endif // __TIMING_H__
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