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/* $Id$ */
/** @file newgrf_generic.cpp Handling of generic feature callbacks. */
#include "stdafx.h"
#include "debug.h"
#include "newgrf.h"
#include "newgrf_spritegroup.h"
#include <list>
struct GenericCallback {
const GRFFile *file;
const SpriteGroup *group;
GenericCallback(const GRFFile *file, const SpriteGroup *group) :
file(file),
group(group)
{ }
};
typedef std::list<GenericCallback> GenericCallbackList;
static GenericCallbackList _gcl[GSF_END];
/**
* Reset all generic feature callback sprite groups.
*/
void ResetGenericCallbacks()
{
for (uint8 feature = 0; feature < lengthof(_gcl); feature++) {
_gcl[feature].clear();
}
}
/**
* Add a generic feature callback sprite group to the appropriate feature list.
* @param feature
* @param file
* @param group
*/
void AddGenericCallback(uint8 feature, const GRFFile *file, const SpriteGroup *group)
{
if (feature >= lengthof(_gcl)) {
grfmsg(5, "AddGenericCallback: Unsupported feature 0x%02X", feature);
return;
}
/* Generic feature callbacks are evaluated in reverse (i.e. the last group
* to be added is evaluated first, etc) thus we push the group to the
* beginning of the list so a standard iterator will do the right thing. */
_gcl[feature].push_front(GenericCallback(file, group));
}
static uint32 GenericCallbackGetRandomBits(const ResolverObject *object)
{
return 0;
}
static uint32 GenericCallbackGetTriggers(const ResolverObject *object)
{
return 0;
}
static void GenericCallbackSetTriggers(const ResolverObject *object, int triggers)
{
return;
}
static uint32 GenericCallbackGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
{
switch (variable) {
case 0x40: return object->u.generic.cargo_type;
case 0x80: return object->u.generic.cargo_type;
case 0x81: return object->u.generic.cargo_type;
case 0x82: return object->u.generic.default_selection;
case 0x83: return object->u.generic.src_industry;
case 0x84: return object->u.generic.dst_industry;
case 0x85: return object->u.generic.distance;
case 0x86: return object->u.generic.event;
case 0x87: return object->u.generic.count;
case 0x88: return object->u.generic.station_size;
default: break;
}
DEBUG(grf, 1, "Unhandled generic feature property 0x%02X", variable);
*available = false;
return UINT_MAX;
}
static const SpriteGroup *GenericCallbackResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
{
if (group->num_loaded == 0) return NULL;
return group->loaded[0];
}
static inline void NewGenericResolver(ResolverObject *res, const GRFFile *grffile)
{
res->GetRandomBits = &GenericCallbackGetRandomBits;
res->GetTriggers = &GenericCallbackGetTriggers;
res->SetTriggers = &GenericCallbackSetTriggers;
res->GetVariable = &GenericCallbackGetVariable;
res->ResolveReal = &GenericCallbackResolveReal;
res->callback = CBID_NO_CALLBACK;
res->callback_param1 = 0;
res->callback_param2 = 0;
res->last_value = 0;
res->trigger = 0;
res->reseed = 0;
res->count = 0;
res->grffile = grffile;
}
/** Follow a generic feature callback list and return the first successful
* answer
* @param feature GRF Feature of callback
* @param object pre-populated resolver object
* @param file address of GRFFile object if file reference is needed, NULL is valid
* @return callback value if successful or CALLBACK_FAILED
*/
static uint16 GetGenericCallbackResult(uint8 feature, ResolverObject *object, const GRFFile **file)
{
assert(feature < lengthof(_gcl));
/* Test each feature callback sprite group. */
for (GenericCallbackList::const_iterator it = _gcl[feature].begin(); it != _gcl[feature].end(); ++it) {
const SpriteGroup *group = it->group;
group = Resolve(group, object);
if (group == NULL) continue;
/* Return NewGRF file if necessary */
if (file != NULL) *file = it->file;
return group->GetCallbackResult();
}
/* No callback returned a valid result, so we've failed. */
return CALLBACK_FAILED;
}
/**
* 'Execute' an AI purchase selection callback
*/
uint16 GetAiPurchaseCallbackResult(uint8 feature, CargoID cargo_type, uint8 default_selection, IndustryType src_industry, IndustryType dst_industry, uint8 distance, AIConstructionEvent event, uint8 count, uint8 station_size, const GRFFile **file)
{
ResolverObject object;
NewGenericResolver(&object, *file);
object.callback = CBID_GENERIC_AI_PURCHASE_SELECTION;
object.u.generic.cargo_type = cargo_type;
object.u.generic.default_selection = default_selection;
object.u.generic.src_industry = src_industry;
object.u.generic.dst_industry = dst_industry;
object.u.generic.distance = distance;
object.u.generic.event = event;
object.u.generic.count = count;
object.u.generic.station_size = station_size;
uint16 callback = GetGenericCallbackResult(feature, &object, file);
if (callback != CALLBACK_FAILED) callback = GB(callback, 0, 8);
return callback;
}
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