Added triggers

doomsday/Include/m_misc.h

@@ -27,6 +27,11 @@
 #define MAX_READ	8192
 #define ISSPACE(c)	((c) == 0 || (c) == ' ' || (c) == '\t' || (c) == '\n' || (c) == '\r')
 
+typedef struct trigger_s {
+	timespan_t duration;
+	timespan_t accum;
+} trigger_t;
+
 extern int	read_count;
 extern int	rndindex;
 
@@ -84,6 +89,9 @@ void		M_RotateVector(float vec[3], float degYaw, float degPitch);
 void		M_ProjectPointOnLinef(fixed_t *point, fixed_t *linepoint, fixed_t *delta, float gap, float *result);
 float		M_CycleIntoRange(float value, float length);
 
+// Time utilities.
+boolean		M_CheckTrigger(trigger_t *trigger, timespan_t advanceTime);
+
 // Other utilities.
 int			M_ScreenShot(char *filename, int bits);
 

doomsday/Src/m_misc.c

@@ -922,10 +922,9 @@ void M_ReplaceFileExt(char *path, char *newext)
 	}
 }
 
-//===========================================================================
-// M_Pretty
-//	Return a prettier copy of the original path.
-//===========================================================================
+/*
+ * Return a prettier copy of the original path.
+ */
 const char *M_Pretty(const char *path)
 {
 #define MAX_BUFS 8
@@ -943,3 +942,20 @@ const char *M_Pretty(const char *path)
 	// We don't know how to make this prettier.
 	return path;
 }
+
+/*
+ * Advances time and return true if the trigger is triggered.
+ */
+boolean M_CheckTrigger(trigger_t *trigger, timespan_t advanceTime)
+{
+	trigger->accum += advanceTime;
+
+	if(trigger->accum >= trigger->duration)
+	{
+		trigger->accum -= trigger->duration;
+		return true;
+	}
+
+	// It wasn't triggered.
+	return false;
+}