www.pudn.com > sn068s.zip > TIMERS.C

#include  
 
/* timer handlers and counters 
    all of these should be locked - if they shouldn't be, they should be 
    moved out of this file! 
   Timer_Handler_Profile, Timer_Counter_Profile 
    200Hz timer for determining relative CPU usage 
   Timer_Handler_Throttle, Timer_Counter_Throttle 
    variable timer, used for speed throttling (50-60Hz or so) 
 */ 
 
#ifdef DEBUG 
volatile unsigned Timer_Counter_Profile = 0, 
 CPU_Profile_Last = 0, CPU_Profile_Test = 0, 
 SPC_Profile_Last = 0, SPC_Profile_Test = 0, 
 GFX_Profile_Last = 0, GFX_Profile_Test = 0; 
 
static void Timer_Handler_Profile(){ Timer_Counter_Profile++; } 
END_OF_STATIC_FUNCTION(Timer_Handler_Profile); 
 
#endif 
 
volatile unsigned FPSTicks; /* was extern "C" */ 
volatile unsigned Timer_Counter_Throttle; 
unsigned long Frametime; 
 
static void Timer_Handler_Throttle(){ 
 Timer_Counter_Throttle++; FPSTicks++; 
} 
END_OF_STATIC_FUNCTION(Timer_Handler_Throttle); 
 
/* timer interface code 
 * timers_init() 
    locks timer handlers/counters, installs Allegro timer 
 * timers_enable(throttle_time) 
    installs timers, sets timing for speed throttle 
 * timers_disable() 
    removes timers 
 * timers_shutdown() 
    removes Allegro timer 
 */ 
static int timers_ready = FALSE; 
static int timers_enabled = FALSE; 
static int timers_locked = FALSE; 
 
void timers_init() 
{ 
 if (!timers_locked) 
 { 
#ifdef DEBUG 
  LOCK_FUNCTION(Timer_Handler_Profile); 
  LOCK_VARIABLE(Timer_Counter_Profile); 
#endif 
 
  LOCK_FUNCTION(Timer_Handler_Throttle); 
  LOCK_VARIABLE(Timer_Counter_Throttle); 
  LOCK_VARIABLE(FPSTicks); 
  timers_locked = TRUE; 
 } 
 if (!timers_ready) 
 { 
  install_timer(); 
  timers_ready = TRUE; 
 } 
} 
 
void timers_enable(unsigned long throttle_time) 
{ 
 if (!timers_enabled) 
 { 
#ifdef DEBUG 
  install_int_ex(Timer_Handler_Profile, MSEC_TO_TIMER(5)); 
#endif 
  install_int_ex(Timer_Handler_Throttle, throttle_time); 
  timers_enabled = TRUE; 
 } 
} 
 
void timers_disable() 
{ 
 if (timers_enabled) 
 { 
#ifdef DEBUG 
  remove_int(Timer_Handler_Profile); 
#endif 
  remove_int(Timer_Handler_Throttle); 
  timers_enabled = FALSE; 
 } 
} 
 
void timers_shutdown() 
{ 
 if (timers_ready) 
 { 
  timers_disable(); 
  remove_timer(); 
  timers_ready = FALSE; 
 } 
} 
 
void set_timer_throttle_hz(int hertz) 
{ 
 Frametime = BPS_TO_TIMER(hertz); 
} 
 
void set_timer_throttle_ms(int msec) 
{ 
 Frametime = MSEC_TO_TIMER(msec); 
} 
 
void set_timer_throttle_ticks(int ticks) 
{ 
 Frametime = ticks; 
}