summaryrefslogtreecommitdiff
path: root/src/newgrf_generic.cpp
blob: 7c4c6097e8a12611e3cbf58e5b089a50db9bf9c0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file newgrf_generic.cpp Handling of generic feature callbacks. */

#include "stdafx.h"
#include "debug.h"
#include "newgrf.h"
#include "newgrf_spritegroup.h"
#include "industrytype.h"
#include "core/bitmath_func.hpp"
#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 = SpriteGroup::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);

	if (src_industry != IT_AI_UNKNOWN && src_industry != IT_AI_TOWN) {
		const IndustrySpec *is = GetIndustrySpec(src_industry);
		/* If this is no original industry, use the substitute type */
		if (is->grf_prop.subst_id != INVALID_INDUSTRYTYPE) src_industry = is->grf_prop.subst_id;
	}

	if (dst_industry != IT_AI_UNKNOWN && dst_industry != IT_AI_TOWN) {
		const IndustrySpec *is = GetIndustrySpec(dst_industry);
		/* If this is no original industry, use the substitute type */
		if (is->grf_prop.subst_id != INVALID_INDUSTRYTYPE) dst_industry = is->grf_prop.subst_id;
	}

	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;
}