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
|
/* $Id$ */
/*
* 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_canal.cpp Implementation of NewGRF canals. */
#include "stdafx.h"
#include "debug.h"
#include "newgrf_spritegroup.h"
#include "newgrf_canal.h"
#include "water_map.h"
/** Table of canal 'feature' sprite groups */
WaterFeature _water_feature[CF_END];
/* Random bits and triggers are not supported for canals, so the following
* three functions are stubs. */
static uint32 CanalGetRandomBits(const ResolverObject *object)
{
/* Return random bits only for water tiles, not station tiles */
return IsTileType(object->u.canal.tile, MP_WATER) ? GetWaterTileRandomBits(object->u.canal.tile) : 0;
}
static uint32 CanalGetTriggers(const ResolverObject *object)
{
return 0;
}
static void CanalSetTriggers(const ResolverObject *object, int triggers)
{
return;
}
static uint32 CanalGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
{
TileIndex tile = object->u.canal.tile;
switch (variable) {
/* Height of tile */
case 0x80: return GetTileZ(tile) / TILE_HEIGHT;
/* Terrain type */
case 0x81: return GetTerrainType(tile);
/* Random data for river or canal tiles, otherwise zero */
case 0x83: return GetWaterTileRandomBits(tile);
}
DEBUG(grf, 1, "Unhandled canal property 0x%02X", variable);
*available = false;
return UINT_MAX;
}
static const SpriteGroup *CanalResolveReal(const ResolverObject *object, const RealSpriteGroup *group)
{
if (group->num_loaded == 0) return NULL;
return group->loaded[0];
}
static void NewCanalResolver(ResolverObject *res, TileIndex tile, const GRFFile *grffile)
{
res->GetRandomBits = &CanalGetRandomBits;
res->GetTriggers = &CanalGetTriggers;
res->SetTriggers = &CanalSetTriggers;
res->GetVariable = &CanalGetVariable;
res->ResolveReal = &CanalResolveReal;
res->u.canal.tile = tile;
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;
}
SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)
{
ResolverObject object;
const SpriteGroup *group;
NewCanalResolver(&object, tile, _water_feature[feature].grffile);
group = SpriteGroup::Resolve(_water_feature[feature].group, &object);
if (group == NULL) return 0;
return group->GetResult();
}
/**
* Run a specific callback for canals.
* @param callback Callback ID.
* @param param1 Callback parameter 1.
* @param param2 Callback parameter 2.
* @param feature For which feature to run the callback.
* @param tile Tile index of canal.
* @return Callback result or CALLBACK_FAILED if the callback failed.
*/
uint16 GetCanalCallback(CallbackID callback, uint32 param1, uint32 param2, CanalFeature feature, TileIndex tile)
{
ResolverObject object;
const SpriteGroup *group;
NewCanalResolver(&object, tile, _water_feature[feature].grffile);
object.callback = callback;
object.callback_param1 = param1;
object.callback_param2 = param2;
group = SpriteGroup::Resolve(_water_feature[feature].group, &object);
if (group == NULL) return CALLBACK_FAILED;
return group->GetCallbackResult();
}
/**
* Get the new sprite offset for a water tile.
* @param tile Tile index of the canal/water tile.
* @param feature For which feature to get the new sprite offset.
* @param cur_offset Current sprite offset.
* @return New sprite offset.
*/
uint GetCanalSpriteOffset(CanalFeature feature, TileIndex tile, uint cur_offset)
{
if (HasBit(_water_feature[feature].callback_mask, CBM_CANAL_SPRITE_OFFSET)) {
uint16 cb = GetCanalCallback(CBID_CANALS_SPRITE_OFFSET, cur_offset, 0, feature, tile);
if (cb != CALLBACK_FAILED) return cur_offset + cb;
}
return cur_offset;
}
|
