rnd-19980930-1

[rocksndiamonds.git] / src / misc.c

diff --git a/src/misc.c b/src/misc.c
index 28d04a6d1b3844eb59994f17142859aa4905a3ff..1ab116d6b771458990b295f4d676b32f36707142 100644 (file)
--- a/src/misc.c
+++ b/src/misc.c
@@ -1,13 +1,12 @@
 /***********************************************************
 *  Rocks'n'Diamonds -- McDuffin Strikes Back!              *
 *----------------------------------------------------------*
-*  ©1995 Artsoft Development                               *
-*        Holger Schemel                                    *
-*        33659 Bielefeld-Senne                             *
-*        Telefon: (0521) 493245                            *
-*        eMail: aeglos@valinor.owl.de                      *
-*               aeglos@uni-paderborn.de                    *
-*               q99492@pbhrzx.uni-paderborn.de             *
+*  (c) 1995-98 Artsoft Entertainment                       *
+*              Holger Schemel                              *
+*              Oststrasse 11a                              *
+*              33604 Bielefeld                             *
+*              phone: ++49 +521 290471                     *
+*              email: aeglos@valinor.owl.de                *
 *----------------------------------------------------------*
 *  misc.c                                                  *
 ***********************************************************/
@@ -24,19 +23,45 @@
 #include <sys/param.h>
 #include <sys/types.h>
 
-void microsleep(unsigned long usec)
+static unsigned long mainCounter(int mode)
 {
-  if (usec < 5000)
+  static struct timeval base_time = { 0, 0 };
+  struct timeval current_time;
+  unsigned long counter_ms;
+
+  gettimeofday(&current_time, NULL);
+
+  if (mode == INIT_COUNTER || current_time.tv_sec < base_time.tv_sec)
+    base_time = current_time;
+
+  counter_ms = (current_time.tv_sec  - base_time.tv_sec)  * 1000
+             + (current_time.tv_usec - base_time.tv_usec) / 1000;
+
+  return counter_ms;           /* return milliseconds since last init */
+}
+
+void InitCounter()             /* set counter back to zero */
+{
+  mainCounter(INIT_COUNTER);
+}
+
+unsigned long Counter()        /* get milliseconds since last call of InitCounter() */
+{
+  return(mainCounter(READ_COUNTER));
+}
+
+static void sleep_milliseconds(unsigned long milliseconds_delay)
+{
+  if (milliseconds_delay < 5)
   {
-    /* we want to wait less than 5 ms -- if we assume that we have a
+    /* we want to wait only a few ms -- if we assume that we have a
        kernel timer resolution of 10 ms, we would wait far to long;
        therefore it's better to do a short interval of busy waiting
        to get our sleeping time more accurate */
 
-    long base_counter = Counter(), actual_counter = Counter();
-    long delay = usec/1000;
+    unsigned long base_counter = Counter(), actual_counter = Counter();
 
-    while (actual_counter < base_counter+delay &&
+    while (actual_counter < base_counter + milliseconds_delay &&
           actual_counter >= base_counter)
       actual_counter = Counter();
   }
@@ -44,79 +69,60 @@ void microsleep(unsigned long usec)
   {
     struct timeval delay;
 
-    delay.tv_sec  = usec / 1000000;
-    delay.tv_usec = usec % 1000000;
+    delay.tv_sec  = milliseconds_delay / 1000;
+    delay.tv_usec = 1000 * (milliseconds_delay % 1000);
 
-    if (select(0,NULL,NULL,NULL,&delay) != 0)
-      fprintf(stderr,"%s: in function microsleep: select failed!\n",
+    if (select(0, NULL, NULL, NULL, &delay) != 0)
+      fprintf(stderr,"%s: in function sleep_milliseconds: select() failed!\n",
              progname);
   }
 }
 
-long mainCounter(int mode)
-{
-  static struct timeval base_time = { 0, 0 };
-  struct timeval current_time;
-  long counter_ms;
-
-  gettimeofday(&current_time,NULL);
-  if (mode == INIT_COUNTER || current_time.tv_sec < base_time.tv_sec)
-    base_time = current_time;
-
-  counter_ms = (current_time.tv_sec - base_time.tv_sec)*1000
-             + (current_time.tv_usec - base_time.tv_usec)/1000;
-
-  return counter_ms;           /* return milliseconds since last init */
-}
-
-void InitCounter() /* set counter back to zero */
-{
-  mainCounter(INIT_COUNTER);
-}
-
-long Counter() /* get milliseconds since last call of InitCounter() */
+void Delay(unsigned long delay)        /* Sleep specified number of milliseconds */
 {
-  return(mainCounter(READ_COUNTER));
+  sleep_milliseconds(delay);
 }
 
-void WaitCounter(long value)   /* wait for counter to reach value */
+BOOL FrameReached(unsigned long *frame_counter_var, unsigned long frame_delay)
 {
-  long wait;
+  unsigned long actual_frame_counter = FrameCounter;
 
-  while((wait=value-Counter())>0)
-    microsleep(wait * 1000);
-}
+  if (actual_frame_counter < *frame_counter_var+frame_delay &&
+      actual_frame_counter >= *frame_counter_var)
+    return(FALSE);
 
-void Delay(long value)         /* Delay 'value' milliseconds */
-{
-  microsleep(value * 1000);
+  *frame_counter_var = actual_frame_counter;
+  return(TRUE);
 }
 
-BOOL DelayReached(long *counter_var, int delay)
+BOOL DelayReached(unsigned long *counter_var, unsigned long delay)
 {
-  long actual_counter = Counter();
+  unsigned long actual_counter = Counter();
 
-  if (actual_counter >= *counter_var+delay || actual_counter < *counter_var)
-  {
-    *counter_var = actual_counter;
-    return(TRUE);
-  }
-  else
+  if (actual_counter < *counter_var + delay &&
+      actual_counter >= *counter_var)
     return(FALSE);
+
+  *counter_var = actual_counter;
+  return(TRUE);
 }
 
-BOOL FrameReached(long *frame_counter_var, int frame_delay)
+void WaitUntilDelayReached(unsigned long *counter_var, unsigned long delay)
 {
-  long actual_frame_counter = FrameCounter;
+  unsigned long actual_counter;
 
-  if (actual_frame_counter >= *frame_counter_var+frame_delay ||
-      actual_frame_counter < *frame_counter_var)
+  while(1)
   {
-    *frame_counter_var = actual_frame_counter;
-    return(TRUE);
+    actual_counter = Counter();
+
+    if (actual_counter < *counter_var + delay &&
+       actual_counter >= *counter_var)
+      sleep_milliseconds((*counter_var + delay - actual_counter) / 2);
+    else
+      break;
   }
-  else
-    return(FALSE);
+
+  *counter_var = actual_counter;
 }
 
 char *int2str(int ct, int nr)