Timer and Timing

def SDL_GetTicks() -> int:
    """
    Get the number of milliseconds since SDL library initialization.
    
    Returns:
    Milliseconds since SDL_Init() was called
    """

def SDL_GetTicks64() -> int:
    """
    Get the number of milliseconds since SDL library initialization as 64-bit value.
    
    Returns:
    Milliseconds since SDL_Init() as 64-bit integer (SDL 2.0.18+)
    """

def SDL_Delay(ms: int) -> None:
    """
    Wait a specified number of milliseconds before returning.
    
    Parameters:
    - ms: milliseconds to delay
    """

def SDL_GetPerformanceCounter() -> int:
    """
    Get the current value of the high resolution counter.
    
    Returns:
    Current counter value in platform-specific units
    """

def SDL_GetPerformanceFrequency() -> int:
    """
    Get the count per second of the high resolution counter.
    
    Returns:
    Counter frequency in counts per second
    """

def SDL_AddTimer(interval: int, callback: SDL_TimerCallback, param: Any) -> int:
    """
    Add a new timer to the pool of timers already running.
    
    Parameters:
    - interval: timer interval in milliseconds
    - callback: function to call when timer expires
    - param: parameter to pass to callback function
    
    Returns:
    Timer ID on success, 0 on error
    """

def SDL_RemoveTimer(timer_id: int) -> bool:
    """
    Remove a timer knowing its ID.
    
    Parameters:
    - timer_id: ID of timer to remove
    
    Returns:
    True if timer was removed successfully
    """

def SDL_TICKS_PASSED(A: int, B: int) -> bool:
    """
    Compare SDL tick values for proper overflow handling.
    
    Parameters:
    - A: first tick value
    - B: second tick value
    
    Returns:
    True if A has passed B, accounting for overflow
    """

import sdl2

# Initialize SDL
sdl2.SDL_Init(sdl2.SDL_INIT_TIMER)

# Get current time
start_time = sdl2.SDL_GetTicks()

# Do some work...
sdl2.SDL_Delay(1000)  # Wait 1 second

# Calculate elapsed time
elapsed = sdl2.SDL_GetTicks() - start_time
print(f"Elapsed time: {elapsed}ms")

import sdl2

# Get high-resolution timer frequency
frequency = sdl2.SDL_GetPerformanceFrequency()
print(f"Timer frequency: {frequency} Hz")

# Measure precise timing
start_counter = sdl2.SDL_GetPerformanceCounter()

# Do time-critical work...

end_counter = sdl2.SDL_GetPerformanceCounter()

# Calculate elapsed time in seconds
elapsed_seconds = (end_counter - start_counter) / frequency
elapsed_ms = elapsed_seconds * 1000
print(f"Precise elapsed time: {elapsed_ms:.3f}ms")

import sdl2

# Target 60 FPS
TARGET_FPS = 60
FRAME_TIME = 1000 // TARGET_FPS  # ~16.67ms per frame

# Game loop with frame rate control
running = True
last_time = sdl2.SDL_GetTicks()

while running:
    current_time = sdl2.SDL_GetTicks()
    frame_time = current_time - last_time
    
    if frame_time >= FRAME_TIME:
        # Update game logic
        update_game()
        
        # Render frame
        render_frame()
        
        last_time = current_time
    else:
        # Sleep for remaining frame time
        sleep_time = FRAME_TIME - frame_time
        if sleep_time > 0:
            sdl2.SDL_Delay(sleep_time)

import sdl2
from ctypes import c_void_p

def timer_callback(interval, param):
    """Timer callback function"""
    print(f"Timer fired! Interval: {interval}ms")
    return interval  # Return interval to repeat, 0 to stop

# Initialize SDL
sdl2.SDL_Init(sdl2.SDL_INIT_TIMER)

# Add a timer that fires every 500ms
timer_id = sdl2.SDL_AddTimer(500, timer_callback, None)

if timer_id != 0:
    print(f"Timer added with ID: {timer_id}")
    
    # Let timer run for a while
    sdl2.SDL_Delay(3000)
    
    # Remove the timer
    if sdl2.SDL_RemoveTimer(timer_id):
        print("Timer removed successfully")
else:
    print("Failed to add timer")

import sdl2

class GameTimer:
    def __init__(self):
        self.last_time = sdl2.SDL_GetPerformanceCounter()
        self.frequency = sdl2.SDL_GetPerformanceFrequency()
    
    def get_delta_time(self):
        """Get delta time in seconds since last call"""
        current_time = sdl2.SDL_GetPerformanceCounter()
        delta = (current_time - self.last_time) / self.frequency
        self.last_time = current_time
        return delta

# Usage in game loop
timer = GameTimer()

while running:
    dt = timer.get_delta_time()
    
    # Update game objects with delta time
    player.update(dt)
    enemies.update(dt)
    
    # Render frame
    render()

# Timer callback function type
SDL_TimerCallback = Callable[[int, Any], int]
"""
Timer callback function signature.

Parameters:
- interval: timer interval in milliseconds
- param: user data passed to SDL_AddTimer

Returns:
- Next timer interval in milliseconds, or 0 to cancel timer
"""

SDL_TimerID = int
"""Timer identifier returned by SDL_AddTimer."""