// discard working packet, now processing next packet in queue
bool network_update( void )
{
if (packet_in[0])
{
packets_shift_up(packet_in, NET_PACKET_QUEUE);
queue_in_sync++;
return true;
}
return false;
}
// discard working packet, now processing next packet in queue
bool network_update( void )
{
#ifdef __BLACKBERRY__
return true;
#else
if (packet_in[0])
{
packets_shift_up(packet_in, NET_PACKET_QUEUE);
queue_in_sync++;
return true;
}
return false;
#endif
}
// receive state packet, wait until received
bool network_state_update( void )
{
#ifdef __BLACKBERRY__
return false;
#else
if (network_state_is_reset())
{
return 0;
} else {
packets_shift_up(packet_state_in, NET_PACKET_QUEUE);
packets_shift_up(packet_state_in_xor, NET_PACKET_QUEUE);
last_state_in_sync++;
// current xor packet index
int x = network_delay - (last_state_in_sync - 1) % network_delay - 1;
// loop until needed packet is available
while (!packet_state_in[0])
{
// xor the packet from thin air, if possible
if (packet_state_in_xor[x] && SDLNet_Read16(&packet_state_in_xor[x]->data[0]) == PACKET_STATE_XOR)
{
// check for all other required packets
bool okay = true;
for (int i = 1; i <= x; i++)
{
if (packet_state_in[i] == NULL)
{
okay = false;
break;
}
}
if (okay)
{
packet_state_in[0] = SDLNet_AllocPacket(NET_PACKET_SIZE);
packet_copy(packet_state_in[0], packet_state_in_xor[x]);
for (int i = 1; i <= x; i++)
for (int j = 4; j < packet_state_in[0]->len; j++)
packet_state_in[0]->data[j] ^= packet_state_in[i]->data[j];
break;
}
}
static Uint32 resend_tick = 0;
if (SDL_GetTicks() - last_state_in_tick > NET_RESEND && SDL_GetTicks() - resend_tick > NET_RESEND)
{
SDLNet_Write16(PACKET_STATE_RESEND, &packet_out_temp->data[0]);
SDLNet_Write16(last_state_in_sync - 1, &packet_out_temp->data[2]);
network_send_no_ack(4); // PACKET_RESEND
resend_tick = SDL_GetTicks();
}
if (network_check() == 0)
SDL_Delay(1);
}
if (network_delay > 1)
{
// process the current in packet against the xor queue
if (packet_state_in_xor[x] == NULL)
{
packet_state_in_xor[x] = SDLNet_AllocPacket(NET_PACKET_SIZE);
packet_copy(packet_state_in_xor[x], packet_state_in[0]);
packet_state_in_xor[x]->status = 0;
} else {
for (int j = 4; j < packet_state_in_xor[x]->len; j++)
packet_state_in_xor[x]->data[j] ^= packet_state_in[0]->data[j];
}
}
last_state_in_tick = SDL_GetTicks();
}
return 1;
#endif
}
// poll for new packets received, check that connection is alive, resend queued packets if necessary
int network_check( void )
{
#ifdef __BLACKBERRY__
#else
if (!net_initialized)
return -1;
if (connected)
{
// timeout
if (!network_is_alive())
{
if (!quit)
network_tyrian_halt(2, false);
}
// keep-alive
static Uint32 keep_alive_tick = 0;
if (SDL_GetTicks() - keep_alive_tick > NET_KEEP_ALIVE)
{
network_prepare(PACKET_KEEP_ALIVE);
network_send_no_ack(4);
keep_alive_tick = SDL_GetTicks();
}
}
// retry
if (packet_out[0] && SDL_GetTicks() - last_out_tick > NET_RETRY)
{
if (!SDLNet_UDP_Send(socket, 0, packet_out[0]))
{
printf("SDLNet_UDP_Send: %s\n", SDL_GetError());
return -1;
}
last_out_tick = SDL_GetTicks();
}
switch (SDLNet_UDP_Recv(socket, packet_temp))
{
case -1:
printf("SDLNet_UDP_Recv: %s\n", SDL_GetError());
return -1;
break;
case 0:
break;
default:
if (packet_temp->channel == 0 && packet_temp->len >= 4)
{
switch (SDLNet_Read16(&packet_temp->data[0]))
{
case PACKET_ACKNOWLEDGE:
if ((Uint16)(SDLNet_Read16(&packet_temp->data[2]) - last_ack_sync) < NET_PACKET_QUEUE)
{
last_ack_sync = SDLNet_Read16(&packet_temp->data[2]);
}
{
Uint16 i = SDLNet_Read16(&packet_temp->data[2]) - queue_out_sync;
if (i < NET_PACKET_QUEUE)
{
if (packet_out[i])
{
SDLNet_FreePacket(packet_out[i]);
packet_out[i] = NULL;
}
}
}
// remove acknowledged packets from queue
while (packet_out[0] == NULL && (Uint16)(last_ack_sync - queue_out_sync) < NET_PACKET_QUEUE)
{
packets_shift_up(packet_out, NET_PACKET_QUEUE);
queue_out_sync++;
}
last_in_tick = SDL_GetTicks();
break;
case PACKET_CONNECT:
queue_in_sync = SDLNet_Read16(&packet_temp->data[2]);
for (int i = 0; i < NET_PACKET_QUEUE; i++)
{
if (packet_in[i])
{
SDLNet_FreePacket(packet_in[i]);
packet_in[i] = NULL;
}
}
case PACKET_DETAILS:
case PACKET_WAITING:
case PACKET_BUSY:
case PACKET_GAME_QUIT:
case PACKET_GAME_PAUSE:
case PACKET_GAME_MENU:
{
Uint16 i = SDLNet_Read16(&packet_temp->data[2]) - queue_in_sync;
if (i < NET_PACKET_QUEUE)
{
if (packet_in[i] == NULL)
packet_in[i] = SDLNet_AllocPacket(NET_PACKET_SIZE);
packet_copy(packet_in[i], packet_temp);
} else {
// inbound packet queue overflow/underflow
// under normal circumstances, this is okay
}
}
network_acknowledge(SDLNet_Read16(&packet_temp->data[2]));
case PACKET_KEEP_ALIVE:
last_in_tick = SDL_GetTicks();
break;
case PACKET_QUIT:
if (!quit)
{
network_prepare(PACKET_QUIT);
network_send(4); // PACKET_QUIT
}
network_acknowledge(SDLNet_Read16(&packet_temp->data[2]));
if (!quit)
network_tyrian_halt(1, true);
break;
case PACKET_STATE:
// place packet in queue if within limits
{
Uint16 i = SDLNet_Read16(&packet_temp->data[2]) - last_state_in_sync + 1;
if (i < NET_PACKET_QUEUE)
{
if (packet_state_in[i] == NULL)
packet_state_in[i] = SDLNet_AllocPacket(NET_PACKET_SIZE);
packet_copy(packet_state_in[i], packet_temp);
}
}
break;
case PACKET_STATE_XOR:
// place packet in queue if within limits
{
Uint16 i = SDLNet_Read16(&packet_temp->data[2]) - last_state_in_sync + 1;
if (i < NET_PACKET_QUEUE)
{
if (packet_state_in_xor[i] == NULL)
{
packet_state_in_xor[i] = SDLNet_AllocPacket(NET_PACKET_SIZE);
packet_copy(packet_state_in_xor[i], packet_temp);
} else if (SDLNet_Read16(&packet_state_in_xor[i]->data[0]) != PACKET_STATE_XOR) {
for (int j = 4; j < packet_state_in_xor[i]->len; j++)
packet_state_in_xor[i]->data[j] ^= packet_temp->data[j];
SDLNet_Write16(PACKET_STATE_XOR, &packet_state_in_xor[i]->data[0]);
}
}
}
break;
case PACKET_STATE_RESEND:
// resend requested state packet if still available
{
Uint16 i = last_state_out_sync - SDLNet_Read16(&packet_temp->data[2]);
if (i > 0 && i < NET_PACKET_QUEUE)
{
if (packet_state_out[i])
{
if (!SDLNet_UDP_Send(socket, 0, packet_state_out[i]))
{
printf("SDLNet_UDP_Send: %s\n", SDL_GetError());
return -1;
}
}
}
}
break;
default:
fprintf(stderr, "warning: bad packet %d received\n", SDLNet_Read16(&packet_temp->data[0]));
return 0;
break;
}
return 1;
}
break;
}
#endif
return 0;
}
