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
|
/*
* 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.h"
#include "water_map.h"
#include "spritecache.h"
#include "safeguards.h"
/** Table of canal 'feature' sprite groups */
WaterFeature _water_feature[CF_END];
/** Scope resolver of a canal tile. */
struct CanalScopeResolver : public ScopeResolver {
TileIndex tile; ///< Tile containing the canal.
CanalScopeResolver(ResolverObject &ro, TileIndex tile)
: ScopeResolver(ro), tile(tile)
{
}
uint32 GetRandomBits() const override;
uint32 GetVariable(byte variable, uint32 parameter, bool *available) const override;
};
/** Resolver object for canals. */
struct CanalResolverObject : public ResolverObject {
CanalScopeResolver canal_scope;
CanalFeature feature;
CanalResolverObject(CanalFeature feature, TileIndex tile,
CallbackID callback = CBID_NO_CALLBACK, uint32 callback_param1 = 0, uint32 callback_param2 = 0);
ScopeResolver *GetScope(VarSpriteGroupScope scope = VSG_SCOPE_SELF, byte relative = 0) override
{
switch (scope) {
case VSG_SCOPE_SELF: return &this->canal_scope;
default: return ResolverObject::GetScope(scope, relative);
}
}
GrfSpecFeature GetFeature() const override;
uint32 GetDebugID() const override;
};
/* virtual */ uint32 CanalScopeResolver::GetRandomBits() const
{
/* Return random bits only for water tiles, not station tiles */
return IsTileType(this->tile, MP_WATER) ? GetWaterTileRandomBits(this->tile) : 0;
}
/* virtual */ uint32 CanalScopeResolver::GetVariable(byte variable, uint32 parameter, bool *available) const
{
switch (variable) {
/* Height of tile */
case 0x80: {
int z = GetTileZ(this->tile);
/* Return consistent height within locks */
if (IsTileType(this->tile, MP_WATER) && IsLock(this->tile) && GetLockPart(this->tile) == LOCK_PART_UPPER) z--;
return z;
}
/* Terrain type */
case 0x81: return GetTerrainType(this->tile);
/* Dike map: Connectivity info for river and canal tiles
*
* Assignment of bits to directions defined in agreement with
* http://projects.tt-forums.net/projects/ttdpatch/repository/revisions/2367/entry/trunk/patches/water.asm#L879
* 7
* 3 0
* 6 * 4
* 2 1
* 5
*/
case 0x82: {
uint32 connectivity =
(!IsWateredTile(TILE_ADDXY(tile, -1, 0), DIR_SW) << 0) // NE
+ (!IsWateredTile(TILE_ADDXY(tile, 0, 1), DIR_NW) << 1) // SE
+ (!IsWateredTile(TILE_ADDXY(tile, 1, 0), DIR_NE) << 2) // SW
+ (!IsWateredTile(TILE_ADDXY(tile, 0, -1), DIR_SE) << 3) // NW
+ (!IsWateredTile(TILE_ADDXY(tile, -1, 1), DIR_W) << 4) // E
+ (!IsWateredTile(TILE_ADDXY(tile, 1, 1), DIR_N) << 5) // S
+ (!IsWateredTile(TILE_ADDXY(tile, 1, -1), DIR_E) << 6) // W
+ (!IsWateredTile(TILE_ADDXY(tile, -1, -1), DIR_S) << 7); // N
return connectivity;
}
/* Random data for river or canal tiles, otherwise zero */
case 0x83: return IsTileType(this->tile, MP_WATER) ? GetWaterTileRandomBits(this->tile) : 0;
}
DEBUG(grf, 1, "Unhandled canal variable 0x%02X", variable);
*available = false;
return UINT_MAX;
}
GrfSpecFeature CanalResolverObject::GetFeature() const
{
return GSF_CANALS;
}
uint32 CanalResolverObject::GetDebugID() const
{
return this->feature;
}
/**
* Canal resolver constructor.
* @param feature Which canal feature we want.
* @param tile Tile index of canal.
* @param callback Callback ID.
* @param callback_param1 First parameter (var 10) of the callback.
* @param callback_param2 Second parameter (var 18) of the callback.
*/
CanalResolverObject::CanalResolverObject(CanalFeature feature, TileIndex tile,
CallbackID callback, uint32 callback_param1, uint32 callback_param2)
: ResolverObject(_water_feature[feature].grffile, callback, callback_param1, callback_param2), canal_scope(*this, tile), feature(feature)
{
this->root_spritegroup = _water_feature[feature].group;
}
/**
* Lookup the base sprite to use for a canal.
* @param feature Which canal feature we want.
* @param tile Tile index of canal, if appropriate.
* @return Base sprite returned by GRF, or \c 0 if none.
*/
SpriteID GetCanalSprite(CanalFeature feature, TileIndex tile)
{
CanalResolverObject object(feature, tile);
const SpriteGroup *group = object.Resolve();
if (group == nullptr) 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.
*/
static uint16 GetCanalCallback(CallbackID callback, uint32 param1, uint32 param2, CanalFeature feature, TileIndex tile)
{
CanalResolverObject object(feature, tile, callback, param1, param2);
return object.ResolveCallback();
}
/**
* 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;
}
|
