Files @ r3303:1bae0f5399a4
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Location: cpp/openttd-patchpack/source/ai/ai.c

bjarni
(svn r4060) -Codechange: [OSX] made the release target (in os/macosx/Makefile) easier to use since it gives the release disk image the right name automatically
it now uses REV instead of RELEASE, which means RELEASE is not needed to be set manaully anymore
it also automatically adds "-jaguar" when making a build aimed at OSX 10.2 (codenamed jaguar)
/* $Id$ */

#include "../stdafx.h"
#include "../openttd.h"
#include "../variables.h"
#include "../command.h"
#include "../network.h"
#include "ai.h"
#include "default/default.h"

/**
 * Dequeues commands put in the queue via AI_PutCommandInQueue.
 */
static void AI_DequeueCommands(byte player)
{
	AICommand *com, *entry_com;

	entry_com = _ai_player[player].queue;

	/* It happens that DoCommandP issues a new DoCommandAI which adds a new command
	 *  to this very same queue (don't argue about this, if it currently doesn't
	 *  happen I can tell you it will happen with AIScript -- TrueLight). If we
	 *  do not make the queue NULL, that commands will be dequeued immediatly.
	 *  Therefor we safe the entry-point to entry_com, and make the queue NULL, so
	 *  the new queue can be safely built up. */
	_ai_player[player].queue = NULL;
	_ai_player[player].queue_tail = NULL;

	/* Dequeue all commands */
	while ((com = entry_com) != NULL) {
		_current_player = player;

		/* Copy the DP back in place */
		_cmd_text = com->text;
		DoCommandP(com->tile, com->p1, com->p2, NULL, com->procc);

		/* Free item */
		entry_com = com->next;
		if (com->text != NULL)
			free(com->text);
		free(com);
	}
}

/**
 * Needed for SP; we need to delay DoCommand with 1 tick, because else events
 *  will make infinite loops (AIScript).
 */
static void AI_PutCommandInQueue(byte player, uint tile, uint32 p1, uint32 p2, uint procc)
{
	AICommand *com;

	if (_ai_player[player].queue_tail == NULL) {
		/* There is no item in the queue yet, create the queue */
		_ai_player[player].queue = malloc(sizeof(AICommand));
		_ai_player[player].queue_tail = _ai_player[player].queue;
	} else {
		/* Add an item at the end */
		_ai_player[player].queue_tail->next = malloc(sizeof(AICommand));
		_ai_player[player].queue_tail = _ai_player[player].queue_tail->next;
	}

	/* This is our new item */
	com = _ai_player[player].queue_tail;

	/* Assign the info */
	com->tile  = tile;
	com->p1    = p1;
	com->p2    = p2;
	com->procc = procc;
	com->next  = NULL;
	com->text  = NULL;

	/* Copy the cmd_text, if needed */
	if (_cmd_text != NULL) {
		com->text = strdup(_cmd_text);
		_cmd_text = NULL;
	}
}

/**
 * Executes a raw DoCommand for the AI.
 */
int32 AI_DoCommand(uint tile, uint32 p1, uint32 p2, uint32 flags, uint procc)
{
	PlayerID old_lp;
	int32 res = 0;
	char *tmp_cmdtext = NULL;

	/* If you enable DC_EXEC with DC_QUERY_COST you are a really strange
	 *   person.. should we check for those funny jokes?
	 */

	/* The test already free _cmd_text in most cases, so let's backup the string, else we have a problem ;) */
	if (_cmd_text != NULL)
		tmp_cmdtext = strdup(_cmd_text);

	/* First, do a test-run to see if we can do this */
	res = DoCommandByTile(tile, p1, p2, flags & ~DC_EXEC, procc);
	/* The command failed, or you didn't want to execute, or you are quering, return */
	if ((CmdFailed(res)) || !(flags & DC_EXEC) || (flags & DC_QUERY_COST)) {
		if (tmp_cmdtext != NULL)
			free(tmp_cmdtext);
		return res;
	}

	/* Recover _cmd_text */
	if (tmp_cmdtext != NULL)
		_cmd_text = tmp_cmdtext;

	/* If we did a DC_EXEC, and the command did not return an error, execute it
	    over the network */
	if (flags & DC_AUTO)                  procc |= CMD_AUTO;
	if (flags & DC_NO_WATER)              procc |= CMD_NO_WATER;

	/* NetworkSend_Command needs _local_player to be set correctly, so
	    adjust it, and put it back right after the function */
	old_lp = _local_player;
	_local_player = _current_player;

#ifdef ENABLE_NETWORK
	/* Send the command */
	if (_networking)
		/* Network is easy, send it to his handler */
		NetworkSend_Command(tile, p1, p2, procc, NULL);
	else
#endif
		/* If we execute BuildCommands directly in SP, we have a big problem with events
		 *  so we need to delay is for 1 tick */
		AI_PutCommandInQueue(_current_player, tile, p1, p2, procc);

	/* Set _local_player back */
	_local_player = old_lp;

	/* Free the temp _cmd_text var */
	if (tmp_cmdtext != NULL)
		free(tmp_cmdtext);

	return res;
}

/**
 * Run 1 tick of the AI. Don't overdo it, keep it realistic.
 */
static void AI_RunTick(PlayerID player)
{
	extern void AiNewDoGameLoop(Player *p);

	Player *p = GetPlayer(player);
	_current_player = player;

	if (_patches.ainew_active) {
		AiNewDoGameLoop(p);
	} else {
		/* Enable all kind of cheats the old AI needs in order to operate correctly... */
		_is_old_ai_player = true;
		AiDoGameLoop(p);
		_is_old_ai_player = false;
	}
}


/**
 * The gameloop for AIs.
 *  Handles one tick for all the AIs.
 */
void AI_RunGameLoop(void)
{
	/* Don't do anything if ai is disabled */
	if (!_ai.enabled) return;

	/* Don't do anything if we are a network-client
	 *  (too bad when a client joins, he thinks the AIs are real, so it wants to control
	 *   them.. this avoids that, while loading a network game in singleplayer, does make
	 *   the AIs to continue ;))
	 */
	if (_networking && !_network_server && !_ai.network_client)
		return;

	/* New tick */
	_ai.tick++;

	/* Make sure the AI follows the difficulty rule.. */
	assert(_opt.diff.competitor_speed <= 4);
	if ((_ai.tick & ((1 << (4 - _opt.diff.competitor_speed)) - 1)) != 0)
		return;

	/* Check for AI-client (so joining a network with an AI) */
	if (_ai.network_client && _ai_player[_ai.network_playas].active) {
		/* Run the script */
		AI_DequeueCommands(_ai.network_playas);
		AI_RunTick(_ai.network_playas);
	} else if (!_networking || _network_server) {
		/* Check if we want to run AIs (server or SP only) */
		Player *p;

		FOR_ALL_PLAYERS(p) {
			if (p->is_active && p->is_ai) {
				/* This should always be true, else something went wrong... */
				assert(_ai_player[p->index].active);

				/* Run the script */
				AI_DequeueCommands(p->index);
				AI_RunTick(p->index);
			}
		}
	}

	_current_player = OWNER_NONE;
}

/**
 * A new AI sees the day of light. You can do here what ever you think is needed.
 */
void AI_StartNewAI(PlayerID player)
{
	assert(player < MAX_PLAYERS);

	/* Called if a new AI is booted */
	_ai_player[player].active = true;
}

/**
 * This AI player died. Give it some chance to make a final puf.
 */
void AI_PlayerDied(PlayerID player)
{
	if (_ai.network_client && _ai.network_playas == player)
		_ai.network_playas = OWNER_SPECTATOR;

	/* Called if this AI died */
	_ai_player[player].active = false;
}

/**
 * Initialize some AI-related stuff.
 */
void AI_Initialize(void)
{
	bool ai_network_client = _ai.network_client;

	/* First, make sure all AIs are DEAD! */
	AI_Uninitialize();

	memset(&_ai, 0, sizeof(_ai));
	memset(&_ai_player, 0, sizeof(_ai_player));

	_ai.network_client = ai_network_client;
	_ai.network_playas = OWNER_SPECTATOR;
	_ai.enabled = true;
}

/**
 * Deinitializer for AI-related stuff.
 */
void AI_Uninitialize(void)
{
	Player* p;

	FOR_ALL_PLAYERS(p) {
		if (p->is_active && p->is_ai) AI_PlayerDied(p->index);
	}
}