META_INFO_SIZE 1024 TEXTURE_SIZE 45 1024 1024 TEXTURE_1_OFFSET META_IN

META_INFO_SIZE=(1024)
TEXTURE_SIZE=(45 * 1024 * 1024)
TEXTURE_1_OFFSET=META_INFO_SIZE
TEXTURE_2_OFFSET=(TEXTURE_SIZE + TEXTURE_1_OFFSET)

def getdata(memory, offset, size):
    data = array.array('b', memory.buf[offset:offset+size])
    return data


INFINITY = 4294967295
sharedmemory = shared_memory.SharedMemory(name=shared_memory_name, create=False, size=SHARED_MEMORY_SIZE)
texture1_mutex = win32event.OpenMutex(win32event.SYNCHRONIZE, false, texture1_mutex_name)
texture2_mutex = win32event.OpenMutex(win32event.SYNCHRONIZE, false, texture2_mutex_name)
texture_ready_event = win32event.OpenEvent(win32event.SYNCHRONIZE, false, texture_ready_name);

while True:
    if win32event.WAIT_OBJECT_0 == win32event.WaitForSingleObject(texture_ready_event, -1):
        meta = struct.unpack('IIII', sharedmemory)
        data=array.array()
        data_size = meta[0]*meta[1]*4
        if meta[3] == 1:
            if win32event.WaitForSingleObject(texture1_mutex, 0) == win32event.WAIT_OBJECT_0:
                data=getdata(sharedmemory, TEXTURE_1_OFFSET, data_size)
                win32event.ReleaseMutex(texture1_mutex)
            elif win32event.WaitForSingleObject(texture2_mutex, 0) == win32event.WAIT_OBJECT_0:
                data=getdata(sharedmemory, TEXTURE_2_OFFSET, data_size)
                win32event.ReleaseMutex(texture2_mutex)
        elif meta[3] == 2:
            if win32event.WaitForSingleObject(texture2_mutex, 0) == win32event.WAIT_OBJECT_0:
                data=getdata(sharedmemory, TEXTURE_2_OFFSET, data_size)
                win32event.ReleaseMutex(texture2_mutex)
            elif win32event.WaitForSingleObject(texture1_mutex, 0) == win32event.WAIT_OBJECT_0:
                data=getdata(sharedmemory, TEXTURE_1_OFFSET, data_size)
                win32event.ReleaseMutex(texture1_mutex)