Demo/Galaxy/schedul_fx.c

   1 /**************************
   2  *
   3  * schedul_fx.c
   4  *
   5  * things dealing with time.
   6  * corTeX / Optimum ~ 1998
   7  *
   8  **************************/
   9
  10 #include <exec/types.h>
  11
  12 #include "schedul_fx.h"
  13
  14 unsigned long int frame_count;
  15
  16 void opti_sched_init(){
  17   gettimeofday( &demo_start_time, NULL);
  18   sequence_start_time =
  19            frame_time =
  20     demo_current_time = demo_start_time;
  21
  22   timerclear( &demo_elapsed_time);
  23   timerclear( &frame_elapsed_time);
  24   frame_count = 0;
  25 }
  26 void opti_sched_update(){
  27   gettimeofday( &demo_current_time, NULL);
  28   opti_diff_timeval( &demo_start_time,
  29                      &demo_current_time,
  30                      &demo_elapsed_time);
  31
  32   opti_diff_timeval( &sequence_start_time,
  33                      &demo_current_time,
  34                      &sequence_elapsed_time);
  35 }
  36
  37 void opti_sched_nextframe(){
  38   struct timeval frame_tmp;
  39
  40   gettimeofday( &frame_tmp, NULL);
  41   opti_diff_timeval(&frame_time,
  42                     &frame_tmp,
  43                     &frame_elapsed_time);
  44   frame_time=frame_tmp;
  45   frame_count++;
  46
  47 }
  48 void opti_sched_nextsequence(){
  49   gettimeofday( &sequence_start_time, NULL);
  50   timerclear (&sequence_elapsed_time);
  51   frame_count = 0;
  52 }
  53
  54
  55 float opti_scale_time(float secscale,struct timeval*elapsed){
  56   return (secscale * elapsed->tv_sec + secscale * elapsed->tv_usec / 1000000);
  57 }
  58
  59 void  opti_diff_timeval(struct timeval*old, struct timeval*new,
  60                             struct timeval*dst){
  61   dst->tv_sec = new->tv_sec - old->tv_sec;
  62   if (new->tv_usec > old->tv_usec)
  63     dst->tv_usec = new->tv_usec - old->tv_usec;
  64   else {
  65     dst->tv_usec = 1000000+ new->tv_usec - old->tv_usec;
  66     dst->tv_sec--;
  67   }
  68 }
  69